Electrician Test

8/18/2019 Electrician Test

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Encoded by:

Engr. Aldous Brian M. Mantiza, ECT, ECE


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1.

The instrument most widely used for testing of semiconductor diodes is.

a.

Voltmeter

b.

Ammeter

c.

Ohmmeter

d.

Oscilloscope

2.

An 8-Volt relay is used with a 12-Volt power supply. The relay requires a

current of 0.1 Amp. What is the series resistance required?

a.

40 ohm

b.

480 ohm

c.

120 ohm

d.

80 ohm

3.

What is the meaning of the abbreviation of PCB?

a.

Printed Circuit Board

b.

Positive Colour Board

c.

Power Control Bridge

d.

Positive Current Biased

4.

The maximum current that a 15 Volt, 3 Watt Zener diode can handle without damage is?

a.

20 A

b.

0.5 A

c.

0.45 A

d.

0.2 A

5.

What principle of measurement is the viscosity controller based on?

a.

Measurement of differential pressure

b.

Measurement of flow

c.

Measurement of two different temperatures

d.

Measurement of temperature

6.

When we are using a diode to convert AC to DC, it is usually referred to as a

a.

Controller

b.

Regulator

c.

Rectifier

d.

Alternator

7.

The typical current gain of a common emitter transistor is

a.

10-200

b.

1-10c.

50-5000

d.

1-1000

8.

The inductance which will induce an EMF of 1 Volt in a conductor when the current is changing at a rate of 1 Amp

per second, is defined as?

a.

Microfarad

b.

Henry

c.

Millihenry

d.

Farad


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9.

What kind of electrolyte is used for Nickel-iron batteries?

a.

Solution of zinc-carbon and water

b.

Solution of sulphuric acid and water

c.

Solution of potassium hydroxide (KOH) and water

d.

Solution of sodium and water

10.

How can we check if a lead –acid type battery is fully charged or not?

a.

Measure the level of the electrolyte

b.

Measure the specific gravity of the electrolyte

c.

Measure the temperature of the electrolyte

d.

Measure the voltage

11.

The circuit consists of two inductors, L(1) = 6H and L(2) = 12H, connected in parallel. Calculate the equivalent L(S)

of two inductors.

a.

18H

b.

1.5H

c.

0.5H

d.

4H

12.

The circuit consists of two inductors, L(1) = 6H and L(2) = 12H, connected in series. Calculate the equivalent L(S) o

two inductors.

a.

18 H

b.

4 H

c.

1.5 H

d.

2 H

13.

The circuit consists of two capacitors, C(1) = 6uF and C(2) = 12uF, in parallel. Calculate the equivalent C(S) of the

two capacitors.

a.

4uF

b.

2uF

c.

18uF

d.

1.5uF

14.

The circuit consists of two capacitors, C(1) = 6uF and C(2) = 12uF, in series. Calculate the equivalent C(S) of the

two capacitors.

a.

4uF

b.

2uF

c.

18uFd.

1.5uF

15.

This circuit consists of two resistances, R1 = 6 ohm and R2 = 12 ohm, connected in

series. Calculate the equivalent resistance R(S) of the two resistances?

a.

18 ohm

b.

2 ohm

c.

4 ohm

d.

1.5 ohm


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22.

This circuit consists of a current source I, a change-over switch S, a

resistor R and an inductor L. The voltage/time figures 1 to 4 show

possible changes through L if the switch S is suddenly shifted from

position 1 to 2 at time t = 0. Only one of the diagrams is correct. Which?

a.

Figure 3

b.

Figure 1

c.

Figure 2

d.

Figure 4

23.

This circuit consists of a current source I, a change-over switch S, a

resistor R and a capacitor C. The current/time figures 1 to 4 show

possible changes in the current I in case the switch S is suddenly

shifted from position 1 to 2 at time t=0. Only one of the diagrams is

correct. Which?

a.

Figure D

b.

Figure A

c.

Figure C

d.

Figure B

24.

This circuit consists of a voltage source V, a change-over switch S, a

resistor R and a capacitor C. The voltage/time figures 1 to 4 show

possible changes in the voltage V(C) in case the switch S is suddenly

shifted from position 1 to 2 at time t = 0. Only one of the diagrams is

correct. Which?a.

Figure 1

b.

Figure 2

c.

Figure 3

d.

Figure 4

25.

What is digital signal?

a.

Signal indicating voltage

b.

A signal indicating Revolution per minute (RPM)

c.

A signal indicating ampere

d.

A signal representing 0 = “low” and 1 = “High”

26.

What is an analogous signal?

a.

A variable electric signal

b.

A measure for voltage

c.

A stable electric signal

d.

A measure for electric current


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27.

A resistor has three red bands. What is the resistance?

a.

2200 ohm

b.

220 ohm

c.

22 ohm

d.

222 ohm

28.

What is the resistance value of this resistor?

a.

230 kohm

b.

2.3 kohm

c.

68 kohm

d.

10 kohm

29.

The physical size of a resistor is an indicator of its:

a.

Tolerance

b.

Resistivity

c.

Total resistance

d.

Power dissipation capability

30.

This resistor has the value of 68 kohm. Which color code will you put on the different color-kings?a.

Red black yellow

b.

Violet green yellow

c.

Black red orange

d.

Blue gray orange

31.

The picture shows a common used 3.5 inches diskette type for storing data. What is the data storing capacity for

such diskette?

a.

1.44 MB

b.

760 kB

c.

20 MB

d.

540 kB

32.

Which electronics component or system of components is this graphical symbol illustrating?

a.

Battery charger

b.

Low pass filter

c.

Inverter

d.

Auto transformer

33.

Which electronic component or system of components is this graphical symbol illustrating?

a.

Bandpass filter

b.

3-phase sine-wave generatorc.

Electric heater

d.

Transformer with ferromagnetic core

34.

Which electronic component or system of components is this graphical symbol illustrating?

a.

Cathode ray tube

b.

Electronic counter

c.

Flip-flop

d.

Operational amplifier


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35.

Which electronic component is this graphical symbol illustrating?

a.

Zener diode

b.

Triac

c.

Transistor

d.

Silicon controlled rectifier

36.

The figures show a graphical symbol for a particular electronic component and a

typical working characteristic for the same component. Which component?

a.

Silicon controlled rectifier (SCR)

b.

Tunnel diode

c.

Zener diode

d.

Field effect transistor

37.


typical working characteristic for the same component. Which component?

a.

Zener diode

b.

Tunnel diode

c.

Field effect transistord.

Triac

38.

The figure shows a silicon controlled rectifier with a RC circuit connected in parallel.

RC circuit is often used in such connection. For which purpose?

a.

Protect the SCR against damage caused by high voltage spikes

b.

Obtain current resonance

c.

Measuring the current through the SCR

d.

Delay the ignition of the SCR

39.

Diodes are widely used in rectification, or the conversion of

alternating current to direct current. This circuit symbol is such

example. The input voltage V(in) is sine-wave AC. Which of the

shown output voltages is correct for this circuit?

a.

Figure 3

b.

Figure 2

c.

Figure 1

d.

Figure 4

40.

The circuit symbol is a widely used system for rectification of AC

into DC. Which of the diagrams is the correct for the output

voltage when the input voltage is sine-shaped as shown?

a.

Figure 1

b.

Figure 2

c.

Figure 3

d.

Figure 4


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41.

The circuit symbol is a full-wave bridge rectifier. Which electronic

component will you connect between ‘a’ and ‘b’ in order to obtain

reduced ripple voltage to the load RL?

a.

Inductive reactor

b.

Resistance

c.

Zener diode

d.

Capacitor

42.

Which of the 3 alternatives given is correct for a NOT-gate?

a.

Figure 1

b.

Figure 2

c.

Figure 3

d.

None of the figures

43.

Which of the 3 alternatives given is correct for an AND-gate?

a.

Figure 2

b.

Figure 1

c.

Figure 3

d.

None of the figures

44.

Which of the 3 alternatives given is correct for an OR-function?

a.

Figure 2

b.

Figure 1

c.

Figure 3

d.

None of the figures

45.

This graphical symbol is a logic gate. Which gate?

a.

NAND

b.

NOR

c.

AND

d.

OR


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46.


a.

NOR

b.

AND

c.

OR

d.

NAND

47.


a.

AND

b.

NOR

c.

NAND

d.

OR

48.

This circuit is a logic gate with two input signals, A and B, and one output

signal Q. Which type of logic function is the gate giving?

a.

OR gate

b.

AND gate

c.

NOR gate

d.

NAND gate

49.

This circuit is a logic gate with two input signals, A and B, and one

output signal Q. Which type of logic function is the gate giving?

a.

AND gate

b.

NOR gate

c.

NAND gate

d.

OR gate

50.

This circuit is a flip-flop. Which type?

a.

Bi-stable flip-flop

b.

Unstable flip-flop

c.

Schmitt trigger

d.

Mono-stable flip-flop

51.

This is a parallel L-C circuit with curve showing frequency-impedance

characteristics. Which of the formulas A to D will you utilize for determining

the resonant frequency f?

a.

fo = 1/(2 sqrt (L/C))

b.

fo = 1/(sqrt(1 - LC))

c.

fo = 1/(sqrt(1 - LC))

d.

fo = sqrt(L/C) / C


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52.

When paralleling two alternators they must have:

a.

Same number of phases

b.

Same frequency

c.

All of the mentioned alternatives

d.

Same phase rotation

53.

The automatic voltage regulator is used to control the output voltage of the

alternator at varying load conditions by:

a.

Varying the excitation field strength by regulating excitation voltage/current

b.

Supplying variable current to compounding and no load transformers in the alternator stator winding

circuit

c.

All of the mentioned alternatives

d.

Regulating the voltage signal to the engine governor to regulate the speed to the desired load condition

54.

At which point do you engage the main circuit breaker of the incoming alternator when paralleling two

alternators?

a.

With the pointer of the synchronoscope rotating fast and both synchronizing lamps flashing on and off

b.

In none of the mentioned alternatives

c.

With the pointer of the synchronizer stopped at any position and both synchronizing lamps bright (on)d.

With the pointer of the synchronoscope at 0deg (12 O’clock) and both synchronizing lamps dark (off)

55.

With two alternators operating in parallel at 75% load capacity, one trips without any warning. What is the first

action that should be taken?

a.

Restart the tripped alternator immediately

b.

Start and connect the emergency alternator

c.

Check the circuit breaker of the tripped alternator

d.

Trip/stop all nonessential loads that are connected to the switchboard

56.

With two alternators running in parallel, you wish to stop one. The first step is to:

a.

Trip the main circuit breaker

b.

Increase the frequency on the switchboard

c.

Remove the load from the alternator to be stopped

d.

Make sure the load is evenly shared

57.

With no. 1 and no. 2 alternators running in parallel and the kW loads equally shared, one alternator is drawing

much higher current that the other. What does this indicate?

a.

Alternator frequencies are different and should be adjusted on the governor speed controllers

b.

The alternators are not generating the same voltages and should be adjusted on automatic voltage

regulator rheostats

c.

Alternators are out of phase and should be tripped and paralleled againd.

One alternator has lost one of its phases

58.

What determines the power factor of an alternator when it is connected singularly to the switchboard?

a.

The load connected to the switch board

b.

The excitation voltage

c.

The generated voltage

d.

Number of pairs of pole coils in the excitation winding


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59.

A three phase alternator is connected singularly to the main switchboard. The

switchboard instruments show 440 Volts/950 amperes. With a power factor of 0.8,

what will be the kW load?

a.

905 kW

b.

579.2 kW

c.

522.5 kW

d.

334.4 kW

60.

If you alter the field excitation voltage of one alternator operating in parallel, this will cause change in that

alternators:

a.

Active load (kW)

b.

Reactive load (kVAR)

c.

Frequency

d.

None of the mentioned alternatives

61.

You are paralleling two alternators and the pointer of the synchronoscope slowly rotating and remains stopped in

one position before the circuit breaker is closed. This would indicate:

a.

The frequency of the incoming alternator is the same as that of the main switchboard

b.

The incoming alternator is in phase with the switchboard, but the frequency is not the samec.

The voltage of the incoming alternator is the same as that of the main switchboard

d.

The synchronoscope is not functioning properly and should be checked.

62.

Due to failure of one of the carbon brushes the excitation voltage is lost on one alternator that is operating in

parallel. Will that alternator then:

a.

Overload due to reduced voltage output and increased current

b.

Completely loose its share of the load causing the auxiliary engine to speed up

c.

Try to take all the load and so trip the main circuit breaker

d.

Continue to share the active load (kW) but have very high reactive load (kVAR)

63.

What is the purpose of the alternator reverse power trip?

a.

To prevent the alternator from being paralleled if it is out of phase with the main switchboard

b.

To give automatic disconnection of the circuit breaker when you are taking the alternator of the switch

board

c.

To prevent parallel operation if the excitation field voltage is reversed

d.

To prevent the alternator from “motoring” by being supplied power from other parallel alternator

64.

A 450 volt 3 phase brushless alternator will have the following combination of items mounted on the rotor:

a.

Excitation field winding/main field winding

b.

Excitation field winding/rectifier bank/main field winding

c.

3 phase excitation winding/rectifier bank/main field windingd.

3 phase excitation winding/main field winding

65.

A 450 volt, 859 kW rated generator has not been in operation for several weeks. Prior to starting, insulation

resistance readings are taken. The minimum acceptable insulation resistance reading on the main stator winding

to allow you to proceed with running the generator is:

a.

10 Ohms

b.

10 000 000 Ohms

c.

10 000 Ohms

d.

1000 Ohms


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66.

The power requirements for the excitation winding/circuit for a 3-phase alternator

operating at rated output power are supplied by:

a.

Independent power supply and rectifier unit

b.

The main switchboard via a three phase rectifier

c.

The alternators output itself via the automatic voltage regulator

d.

Independent battery supply

67.

You have just synchronized a second alternator onto the main switchboard, and want to equally share the load

between the “on” and incoming alternators. What would you do first?

a.

Lower the governor speed controller of the incoming alternator and increase the governor speed

controller of the alternator already on the switchboard.

b.

Adjust voltage rheostat for the incoming alternator on the front of the switchboard

c.

Trip the circuit breaker of the incoming alternator and check the voltage and speed adjustments before

trying again

d.

Raise the governor speed controller of the incoming alternator and reduce the governor speed controller

of the alternator already on the switchboard

68.

Before taking insulation resistance readings of generator windings the automatic voltage regulators should beisolated and all semiconductor short circuited or disconnected in order to:

a.

Prevent charging of capacitive components within the automatic voltage regulator causing false

regulation when generator restarts

b.

Prevent damage to sensitive electronic components from high voltage tester

c.

Protect insulation resistance tester from being damaged

d.

Prevent operation of automatic voltage regulator during insulation testing

69.

For which of the following systems would you install a PID-controller?

a.

Temperature-control

b.

Flow-control

c.

Gas measurement

d.

Pressure-control

70.

In which of the following processes will the time constant be of minor importance.

a.

Pressure control

b.

Flow control

c.

Temperature control

d.

Level control

71.

What is typical for a continuous control system?

a.

The output signal is equal to the input signal

b.

The control valve will always be changing position

c.

It is possible to predict the control mathematically

d.

It is not possible to have a stable process


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72.

What will be the probable outcome if the amplification is set to high on the

controller?

a.

The process will oscillate and get out of control

b.

The set-point will change

c.

Nothing

d.

The process response will be very slow

73.

What is typical for a P (proportional)-controller?

a.

Very stable control

b.

It will always be a deviation between the set-point and the process value

c.

Very reliable control and easy installation

d.

Simple maintenance

74.

What is typical for a feed-forward control system?

a.

The process is always oscillating

b.

It is easy to obtain a perfect control

c.

We can calculate the system response mathematically

d.

We are controlling the process inlet side

75.

What is proportional band?

a.

Amplification/10

b.

Amplification/100

c.

Any part of the total amplification

d.

100/amplification

76.

What is the most common type of controller?

a.

P-controller

b.

PID-controller

c.

PD-controller

d.

PI-controller

77.

Which controller must be tuned first in a cascade control system?

a.

The primary controller

b.

The secondary controller

c.

Both at the same time

d.

Any one of them

78.

What is the ideal relation between two following amplitudes on the response curve?

a.

1:8

b.

1:4c.

1:2

d.

1:16

79.

What is dynamic amplifying?

a.

Variable amplifying

b.

Corresponding change in signals

c.

Amplitude of input signal divided by amplitude of output signal

d.

Amplitude of output signal divided by amplitude of input signal


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80.

What is static amplifying?

a.

Corresponding change in signals

b.

Change in output signal divided by change in input signal

c.

Change in input signal times change in output signal

d.

Change in input signal divided by change in output signal

81.

Which of the following parameters will result in oscillation?

a.

Too long I-time

b.

Too high amplification

c.

Too short D-time

d.

Temperature change

82.

Which of the following parameters will not result in oscillation?

a.

Too long I-time

b.

Too long D-time

c.

Temperature change

d.

Too high amplification

83.

What is the meaning of the expression dead-band?a.

It will take some time before the controller is reacting on a change

b.

The controller will not react on a process change in a specific range

c.

It will only react in a limited time

d.

It is not responding to adjustment of set-point

84.

What is the definition of DEAD BAND?

a.

The change needed in the input signal to produce a change in the output signal

b.

A missing electrical signal

c.

The largest difference in the output signal for the same change in the input signal

d.

The change in the output signal produced by a certain change in the input signal

85.

What is the meaning of split-range?

a.

Several control-valves are connected to the same controller

b.

On-Off control

c.

Several controllers are connected to the same control-valve

d.

Several control-loops for the same range

86.

What is the influence of the I (integration) function of a controller?

a.

It will try to reduce the deviation between set-point and process value

b.

Very quick control

c.

Easy to change set-pointd.

It will slow down the control system

87.

During routine checking of alarm functions of main and auxiliary equipment, some set points are cancelled due to

a mistake. What will be the appropriate routine to ensure correct set points are set?

a.

Consult with the instruction manual for the equipment in question for correct values

b.

Select a set point based on present condition allowing for a reasonable safety margin

c.

Check from previous records for correct values

d.

Ask for colleague if he remembers the correct set point


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88.

The range of a transducer is 0-200 bar. The standard output signal 4-20 mA. What is

the output signal when the process value is 100 bar?

a.

10 mA

b.

12 mA

c.

4 mA

d.

24 mA

89.

The range of a transducer is 0-200 bar. The output signal 4-20 mA. What is the span of the output signal?

a.

16 mA

b.

12 mA

c.

4 mA

d.

24 mA

90.

When we are measuring flow of fluids with a fixed area flow meter, the name of the sensing device is:

a.

Turbine rotor

b.

Positive displacement rotor

c.

Float

d.

Orifice plate

91.

When we are measuring level of liquids with a differential pressure meter, the name of the sensing device is?

a.

Pressure diaphragm

b.

Float

c.

Capacitance probe

d.

Positive displacement tube

92.

When we are measuring level of liquids with a conductivity level indicator, the name of the sensing device is?

a.

Displacement probe

b.

Ionization chamber

c.

Electrodes

d.

Capacitance Probe

93.

When we are measuring salinity with a salinometer, the sensing device is?

a.

Inductor capsule

b.

Capacitance probe

c.

Electrodes

d.

Strain gauge

94.

When we are measuring viscosity with a restricted flow viscometer, the name if the sensing device is?

a.

Capillary tube

b.

Bourdon tubec.

Capacitance probe

d.

Rotating cylinder

95.

What is a typical problem when it is something wrong with the span of an instrument?

a.

Zero-point is accurate, but 100% input is not giving 100% output

b.

Zero-point and 100% are correct, but not 50%

c.

Linearity problems

d.

100% output is accurate, but Zero-point is wrong


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96.

When you are calibrating an instrument what is the most common second step

in the procedure (consult the manual)?

a.

Adjustment of range

b.

Adjustment of Zero-point

c.

Adjustment of span

d.

Check linearity

97.

For any engine room operated in UMS-mode, defined checks are to be carried out prior to switching to UMS-

mode. Is it the Engineer on Duty’s responsibility to have the full control of condition any check items prior to

switching to UMS-mode and leaving the engine room, or may he leave the engine?

a.

Ok for 15-20 minutes without a proper check

b.

Ok for a short period as long as one rating is left “on watch”

c.

A described UMS-mode check shall always be carried out prior to leaving the engine room, irrespective o

the time he will be absent.

d.

Ok for one hour without a proper check

98.

When you are calibrating an instrument what is the most common first step in the procedure (consult the

manual)?a.

Adjustment of range

b.

Adjustment of Zero-point and span

c.

Adjustment of span

d.

Adjustment of linearity

99.

What precaution is to be taken when the Engineer on Duty is entering an UMS-mode operated engine room due

to an alarm or due to a scheduled routine check?

a.

Switch the UMS selector switch to manual mode and engage the “dead man alarm”

b.

Leave the UMS selector switch in UMS-mode

c.

Any of the mentioned alternatives will meet the requirements

d.

Switch the UMS selector switch to manual mode only

100.

In some cases we can see that a resistor is connected over an alarm contact (see

diagram). Why is this connection used?

a.

To stabilise power consumption

b.

To avoid sparks on the contacts when opening and closing

c.

Enable measuring the total resistance of the circuit

d.

To monitor the cable/wire for break

101.

What is this kind of controller normally called?a.

A double acting controller

b.

A cascade controller

c.

A two point controller

d.

A two way controller


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102.

In a PID controller we have possibility to change the setting of the proportional band (P),

the Reset time (I) and the Rate time (D). Please indicate which curve shows the typical

response to a change in input, if the setting of the proportional band is too wide.

a.

Figure 3

b.

Figure 1

c.

Figure 4

d.

Figure 2

103.

In a PID controller we have possibility to change the setting of the proportional band (P), the

Reset time (I) and the Rate time (D). Please indicate which curve shows the typical response

to a change in input, if the setting of the rate time is too short.

a.

Figure 3

b.

Figure 1

c.

Figure 4

d.

Figure 2

104.

In a PID controller we have possibility to change the setting of the proportional band (P),the Reset time (I) and the Rate time (D). Please indicate which curve shows the typical

response to a change in input, if the setting of the rate time is too fast.

a.

Figure 3

b.

Figure 1

c.

Figure 4

d.

Figure 2

105.

Wheatstone Resistance Bridge is often used for measuring resistances in for

instance Pt100 temperature sensors or strain gauges. This figure is such a bridge.

What is the requirement for balance of such a bridge? i.e. the current through the

meter i(m) = 0.

a.

R1/R4 = R2/R3

b.

R1+R3 = R2+R4

c.

R1*R3 = R2*R4

d.

R1/R2 = R3/R4

106.

These circuit diagrams illustrate four different methods of wiring between a Pt-100

temperature sensor and its signal processing electronics. Which of the wiring methods

gives the best measuring accuracy?

a.

Figure 2b.

Figure 4

c.

Figure 3

d.

Figure 1


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107.

Prior to the lunch break, the Engineer on Duty observes that the operating

generator set has an output of 90%. With regard to operation of the generator,

what is the –most important- assumption(s) for him to check before switching to

UMS-mode?

a.

All parameters as listed under the other alternatives

b.

Visually checking the auxiliary engine that there are no leaks or other

operating failures

c.

That all operating parameters of the generator set in operation are

normal (e.g. exhaust temperatures, lube oil pressure, cooling water temperature, etc.)

d.

That a secondary auxiliary set is switched to automatic standby mode.

108.

A transformer with 10:1 turns ration and rated 50 kVA, 2400/240 Volts, 60 Hz, is used to step down the voltage to

a distribution system. The low tension voltage is to be kept constant at 240 Volts. What load impedance

connected to the low-tension side will cause the transformer to be fully loaded?

a.

2.3 ohms

b.

1.15 ohms

c.

115 ohms

d.

230 ohms

109.

During a routine sea passage the cooling water high temperature alarm system

for one of the auxiliary engines is out of function and blocked. What will be the

appropriate immediate action?

a.

All the actions listed in the other alternatives

b.

Switch to another generator set (that is available)

c.

Have the failure immediately

d.

If the failure is in conflict with pre-requisitional electric power supply,

ensure manual operation mode until the failure is corrected

110.

Which push-button valve A, B or C must be pushed (operated) in order to

obtain movement of the pneumatic cylinder S?

a.

A

b.

None

c.

C

d.

B

111.

Which of the logic statements is correct for this pneumatic system?

a.

S = A or B or C

b.

S = (A or B) and C

c.

S = A or (B and C)

d.

S = A and B and C


19/39

112.

What do you understand by the expression Master Controller?

a.

The Captain’s controller

b.

State of the art controller

c.

The primary controller in a cascade control-system

d.

The best possible control system

113.

What do you understand by the expression Slave Controller?

a.

The secondary controller in a cascade control system

b.

Feed water controller

c.

The controller is following a pre-set control sequence

d.

The controller is always working hard

114.

What is the meaning of “remote mode” related to a slave controller?

a.

The slave controller receives the set-point from the output signal of the master controller

b.

The slave controller can be turned from the engine control room

c.

The slave controller can be in any mode of operation

d.

The slave controller can be tuned by a hand carried remote controller

115.

When tuning a cascade control system, where do you start?a.

Both at the same time

b.

The slave controller with the master controller in manual mode

c.

The slave controller with the master controller in auto mode

d.

The master controller

116.

In a cascade control system, what is the correct mode of the slave controller during normal operation?

a.

The slave controller shall be in remote mode

b.

The slave controller shall be in auto mode

c.

The slave controller shall be in manual mode

d.

The slave controller can be in any mode

117.

PT-100 sensors are sometimes used with 3 or even 4 wires. What is the reason for this?

a.

For fault indication

b.

Because of power-consumption

c.

Higher measuring accuracy

d.

Higher mechanically strength of the cable

118.

Temperature sensors may be marked Pt 100. What does it mean?

a.

100 ohm at 0 deg C

b.

20 ohm at 100 deg C

c.

100 ohm at 20 deg Cd.

0 ohm at 100 deg C

119.

Temperature sensors may be marked Pt 802. What does it mean?

a.

802 ohm at 20 deg C

b.

20 ohm at 802 deg C

c.

100 ohm at 20 deg C

d.

20 ohm at 100 deg C


20/39

120.

Which component does this graphical symbol illustrate?

a.

Pressure relief valve

b.

Flow controller

c.

Pressure switch

d.

Pressure-reducing regulator

121.


a.

Thermocouple

b.

Resistance temperature sensor

c.

Triac

d.

Potentiometer

122.


a.

Pressure indicator, installed on panel/console

b.

PH analyser

c.

Pressure relief valve, self-containedd.

Pressure indicator, installed locally

123.

Which of the following letter combinations represents a level indicating controller on a

process and instrumentation diagram?

a.

LIC

b.

LIR

c.

CIR

d.

CIL

124.

Which of the following letter combinations represents a temperature controller on a process and

instrumentation diagram?

a.

TIC

b.

FIC

c.

PIC

d.

TC

125.


a.

Remote level controller with indicator

b.

Level switch for centre-tank

c.

Low carbon incineratord.

Low level controller with indicator

126.


a.

Rectifier

b.

Inverter

c.

Differential pressure transmitter

d.

Pressure to electric current converter


21/39

127.

What is the most common signal from an I/P converter?

a.

4-20 mA/3-15 PSI

b.

0-20 mA/0-20 PSI

c.

0-10 V/3-15 PSI

d.

0-1 mA/1-2 BAR

128.

What is an I/P transducer?

a.

A transducer that increase a pressure signal which is too low to give the desired effect

b.

A transducer that converts a pressure to a proportional electric signal

c.

A transducer that is inverting a pressure signal

d.

A transducer that converts a known electric current to a pressure proportional to the current

129.

When calibrating a pressure transducer we have to adjust both SPAN and ZERO. Please indicate in which order

these adjustments should be done.

a.

The order of adjustment is no importance

b.

First Span adjustment and then Zero adjustment. After that Span

setting should be checked again

c.

First Zero adjustment and the Span adjustment. Then Zero should be rechecked

d.

First Span adjustment and then Zero adjustment. After that Span setting should be checked again.

130.

U-tube manometers are often used to measure differential pressure. Which of the listed

pressures is U-tube manometers mostly used for?

a.

Absolute zero pressure

b.

High differential pressures

c.

Cargo pressure

d.

Low differential pressures

131.

Which type instrument is shown on this picture?

a.

Electric Contact manometer

b.

Vacuum type manometer

c.

Differential pressure manometer

d.

Digital manometer

132.

The manometer shown on the picture has an accuracy class 1.0. What is the measuring accuracy if the pointer

indicates 6.0 bar?

a.

+/- 0.06 barb.

+/- 1.0 bar

c.

+/- 0.5 bar

d.

+/- 0.12 bar


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23/39

139.

What is the meaning of term “Span” of transducer?

a.

Type of standard output signal according to ISO

b.

The difference between maximum and minimum measurement that gives a

standard output signal

c.

The maximum output signal when you have a minimum process value

d.

The length between the connecting flanges

140.

Which type temperature sensors are shown on this picture?

a.

Thermistor type NTC

b.

Resistance sensors

c.

Thermocouple sensors

d.

Thermistor type PTC

141.

What is the meaning of term “Range” of transducer?

a.

The difference between possible maximum and minimum measurement

b.

The length between the connecting flanges

c.

The maximum output signal when you have a minimum process value

d.

Type of standard output signal according to ISO

142.

Thermistor will typically have

a.

Relatively nonlinear characteristic

b.

Variable reliability

c.

Inaccurate measurement

d.

Relatively linear characteristic

143.

Thermo-elements will typically have

a.

Medium range of temperature measurement

b.

Relatively narrow range of temperature measurement

c.

No influence at all on the readings

d.

Relatively wide range of temperature measurement

144.

When we are measuring temperature with a thermistor, the name of the sensing device is:

a.

Temp sensitive semi-conductor

b.

Junction of two dissimilar metalls

c.

Capacitance probe

d.

Platinum wire

145.

Will it matter to the accuracy of the measurement how you are installing a resistance element in a thermo-well?

a.

Wrong installation will result in a major deviation in measurement

b.

Will only result in mechanical problemsc.

Will have a minor influence

d.

No influence at all

146.

What is the advantage of a transmitter with a narrow measurement range?

a.

Easy installation

b.

Better linearity and increased accuracy

c.

Do not need any calibration

d.

Lower purchase cost


24/39

147.

Why is it important that a transmitter has been correctly installed at the correct place?

a.

The control system is depending on the best possible process signal

b.

Can be installed anywhere in the piping system

c.

It is important to have easy access to the transmitter for maintenance

d.

It must be easy to observe for troubleshooting

148.

What is the meaning of instrument calibration?

a.

Comparing two instruments of the same type

b.

Comparing input and output values against a documented standard

c.

Turning gauge too an easy reading position

d.

Adjusting size to fit process connection

149.

Two reference points for pressure exist, absolute zero and atmospheric pressure. What

do you call pressures measured relative to atmospheric pressure?

a.

Gauge pressure

b.

Pressure drop

c.

Absolute pressure

d.

Atmospheric pressure

150.

You have to choose one of the following instruments for measuring pressure in an air bottle in measuring range 0-

35 BAR. Which instrument will you install?

a.

Bourdon Tube manometer

b.

U-type Hg manometer

c.

U-type H20 manometer

d.

Bellow type manometer

151.

Choose the group of electrical power supplies that best fits the identification of “Emergency”.

a.

Shaft generator and emergency diesel

b.

Batteries and No. 1 diesel

c.

No.1 diesel and No. 2 diesel

d.

Emergency diesel and batteries

152.

Choose the group of electrical power supplies that best fits the

identification of “Mains”.

a.

Shaft generator and emergency diesel

b.

Batteries and No. 1 diesel

c.

No.1 diesel and No. 2 dieseld.

Emergency diesel and batteries

153.

It is possible to operate two similar generators in parallel at equal power (kW) but at different power factors. The

generator with lower power factor will cause it to run:

a.

Hotter due to increased current

b.

Faster due to increased voltage

c.

Cooler due to increased current

d.

Slower due to increased current


25/39


26/39

161.

Check-synchroniser is often installed to:

a.

Allow auto-synchronising to take place

b.

Prevent manual synchronising outside permitted limits

c.

Ensure fair equal sharing between generators

d.

Permit faster paralleling

162.

The correct time to synchronise is usually taken to be when the Synchroscope reaches the“5 to 12” position. This

allow for:

a.

Generator phase difference error

b.

Circuit breaker operating time

c.

Synchroscope error

d.

Synchroscope pointer time lag

163.

Under normal conditions, the electric power for services supplied from the emergency switchboard is supplied

from:

a.

Emergency batteriesb.

The main diesel generator or shaft generator

c.

A compressed air driven generator

d.

An emergency battery charger

164.

After main power is restored, a timed sequential restart of motor-driven auxiliaries is necessary to avoid:

a.

Overvoltage due to current surges

b.

Over-frequency due to overspeed of generator

c.

Generator overload due to many motors starting at simultaneously

d.

Overloading creating earth faults

165.

The pair of instruments necessary for generator synchronising are:

a.

Voltmeter and Synchroscope

b.

Synchroscope and kVar-meter

c.

kW meter and frequency meter

d.

Amp-meter and Volt-meter

166.

During synchronising, the incoming generator should be running slightly “fast” compared to the busbar

frequency. This is to ensure that the:

a.

Incomer picks up as a motor

b.

Incomer picks up as a generator

c.

Incomers reverse power trip is testedd.

Most rapid synchronising action is achieved

167.

For ideal synchronising, the phase angle difference between the incomer e.m.f. and the busbar voltage should be

a.

0 deg

b.

30 deg behind

c.

30 deg ahead

d.

90 deg lag


27/39


28/39

175.

The function of the fuses in a motor starter circuit is to provide:

a.

Overload protection

b.

Under voltage protection

c.

Short circuit protection

d.

Open circuit protection

176.

A motor is protected by a thermal overcurrent relay. After tripping on overload it will not be

possible to reset the overcurrent relay because the:

a.

Line contactor spring also has to be reset

b.

Oil dash-pot has also to be reset

c.

Starter isolator automatically applies an interlock

d.

Bimetallic strips need time to cool down

177.

“Protective discrimination” means the progressive grading of sizes/tripping times

of:

a.

Generators and motors

b.

Line fuses and over current relays

c.

Magnetic and thermal current transformers

d.

440 V and 220 V transformers

178.

When 3 phase alternators are operating in parallel, it is very important that the reactive load is evenly shared so

that the total alternator loads are evenly shared. If the total alternator load is the vector sum of active and

reactive loads, which side of the vector diagram shown represents the reactive load?

a.

(Y)

b.

Either (X) or (Y)

c.

None of the mentioned alternativesd.

(X)

179.

The insulation resistance (IR) to earth of a new galley hot-plate is measured to be

30Mohm. When three identical hot-plates are tested together their combined IR will

be:

a.

30 Mohm

b.

90 Mohm

c.

3 Mohm

d.

10 Mohm

180.

When data are to be transferred over telephone lines, we often utilize modem at each end. Which of the

following adapter cards (parts) will you use for interfacing a modem to a computer?

a.

Enhanced graphic adapter

b.

VGA display adapter

c.

Parallel adapter

d.

Serial adapter


29/39

181.

The power supply to the hard disk of a personal computer consists normally of two

voltages. Which?

a.

5 V and 12 V

b.

1.5 V and 5 V

c.

12 V and 48 V

d.

12 V and 24 V

182.

Where in the personal computer is the BIOS system located?

a.

On the motherboard

b.

On the keyboard

c.

On the hard disk

d.

On the Video Adapter Card

183.

What do you understand with a computer’s POST system?

a.

An old type video adapter

b.

A series of tests run by the computer at power on

c.

An area of the hard disk that stores the DOS system

d.

Storage area in memory having a specified storage capacity

184.


a.

Resistance, 3300 ohms

b.

Electric heater, 3.3 kW

c.

Inductive reactor, 3.3 kH

d.

Capacitor, 3.3 F

185.


a.

Auto transformer

b.

Variable inductive reactor

c.

Variable electrical heater, 10 kW

d.

Potentiometer, 10 kohm

186.

Temperature sensors of all types are normally mounted in a well, or pocket, when used in pipelines. Why?

a.

Avoid electric current flowing from the sensor to the liquid

b.

Decrease the temperature gradient between the liquid and the sensor

c.

Allow removal of the sensor also when liquid is flowing in the pipe

d.

Suppress electro-magnetic interference between liquid in the pipe and the

sensor

187.

Which of the following temperature sensors does normally give the highest

measuring accuracy?

a.

Resistance sensor, Pt100

b.

Thermistor, NTC

c.

Thermocouple, NiCrNi

d.

Thermistor, PTC


30/39

188.

Use Kirchhoff’s voltage law and Ohm’s law to calculate the voltage V(2)

across the resistance R(2).

a.

4.5 V

b.

6 V

c.

0.75 V

d.

2 V

189.

In a fresh water tank with a height of 5 meters we shall use a pressure transmitter for level measurement. The

tank has a vent-pipe leading to deck 8 meters above the top of the tank. What pressure shall we use as a guidance

when ordering the pressure transducer?

a.

0.5 Bar

b.

0.8 Bar

c.

2.0 Bar

d.

1.3 Bar

190.

In a fresh water tank we are using a pressure transmitter with a range of 0-0.5 bar/ 4-20 mA for level

measurement. The transmitter is for different reasons installed 30 centimetres from the bottom of the tank, and

the tank is 5 meters high. What will the output from the transmitter be when the tank is full? (Pending no

calibration is made)

a.

18.8 mA

b.

30 mA

c.

20 mA

d.

21.2 mA

191.

In a fresh water tank we are using a pressure transmitter with a range of 0-0.5 bar/ 4-20 mA for level

measurement. The transmitter is for different reasons installed 30 centimetres from the bottom of the tank, andthe tank is 5 meters high. What will the output from the transmitter be when the tank is empty?

a.

5.2 mA

b.

2.8 mA

c.

2 mA

d.

4 mA

192.

In what kind of measuring equipment can we find a Bourdon-tube?

a.

In a temperature transmitter

b.

In a pressure transmitter

c.

In an A/D converter

d.

In a flow meter

193.

Which of the following detectors will you use for detecting if a watertight steel door is closed or open?

a.

Proximity switch

b.

Transducer

c.

Synchro

d.

Strain gauge


31/39


32/39

201.

An earth fault exists on the blue line of a 100 A bilge pump circuit. A second earth fault

occurs on the yellow line of a 10 A ventilation fan circuit. The likely outcome is that:

a.

A short circuit occurs between earth fault and the bilge pump fuse blows

b.

Both motors trip out on overload

c.

An open circuit occurs between earth fault and both motors trip out

d.

A short circuit occurs between earth faults and the ventilation fan fuse blows

202.

The internal e.m.f. generated in the phase windings of an a.c. generator is controlled

by:

a.

The diesel speed and load current

b.

The diesel speed and excitation current

c.

The internal volt drop and the residual magnetism

d.

The internal volt drop and the load current

203.

A 10% reduction in generator speed occurs due to a faulty governor. The likely consequence for each motor

powered from this generator is to:

a.

Increase motor speed by about 10%

b.

Reduce motor volt drop by about 10%c.

Increase motor power by about 10%

d.

Reduce motor speed by about 10%

204.


typical working characteristic for the same. Which component?

a.

Zener diode

b.

Thyristor

c.

Tunnel diode

d.

Transistor

205.


a.

Transistor

b.

Tunnel diode

c.

Diode

d.

Silicon controlled rectifier

206.

This amplifier circuit is a very common configuration used to amplify the

difference in voltage between two input signals; in this case input 1 and 2.

What is this amplifier called?a.

Differential amplifier

b.

Common emitter amplifier

c.

Push-pull amplifier

d.

Darlington connection amplifier


33/39


34/39


35/39

220.

Which of the 4 alternatives shows a PNP transistor?

a.

Figure 2

b.

Figure 3

c.

Figure 4

d.

Figure 1

221.

Earthing of signal cables. Which of the 4 alternatives is correct for a cable of

analogue signals?

a.

Figure 1

b.

Figure 2

c.

Figure 3

d.

Figure 4

222.

This is an electronic temperature controller. You have been asked to adjust the

controllers integrating action. Which button on the front of the controller shall be

utilized for this adjustment?

a.

Pos. 2

b.

Pos. 7

c.

Pos. 6

d.

Pos. 8

223.

The pressure inlet to a pressure gauge is varied from zero to full scale and

back to zero again. The output (indicating pressure) versus true pressure is

shown in the diagram. The non-coincidence of loading and unloading curve

is due to internal friction in the instrument. What do we call this

phenomenon?

a.

Dead band

b.

Resolution

c.

Hysteresis

d.

Threshold

224.

What is Hz the abbreviation for?

a.

Frequency in an Alternating Current (AC)

b.

Measure for Resistance

c.

Revolution per minute

d.

Frequency in Direct Current (DC)


36/39

225.

A ships 3-phase a.c. circuit has 440 V and 220 V transformer linked sections. The effect of a single earth fault on

a 220 V line will cause the following earth lamp indication:

a.

In 440 section: All lamps equally bright. In 220 section: All lamps dark

b.

In 440 V section: One lamp dim. In 220 V section: One lamp dim

c.

In 440 V section: Two lamps bright. In 220 V section: Two lamps bright

d.

In 440 V section: All lamps equally bright. In 220 V section: One lamp dim

226.

The earth lamps in a 3-phase system indicate as follows: Red=bright Yellow=dark Blue dim

a.

Light earth – hard earth – no fault

b.

Light earth – no fault – hard earth

c.

no fault – hard earth – Light earth

d.

hard earth – light earth – no fault

227.

Transmission lines play a central role in radio frequency circuits, where they are

used to pipe signals around from one place to another within a circuit, and often

to an antenna system. General rules for such transmission line is that they must

be “matched”. Which of the cables below would you use to obtain a matched

transmission between Z1 and Z2?a.

Figure 2

b.

Figure 3

c.

Figure 4

d.

Figure 1

228.

There are many applications in circuit theory where it is important to obtain the

maximum possible power that a given source can deliver. This figure consists of a

practical voltage source V(g) with internal resistance R(s). A resistance R(L) will

maximize the power transmission from the source to R(L)?

a.

R(L) = 0.5 R(s)

b.

R(L) = 2 R(s)

c.

R(L) = R(s)

d.

R(L) = R(s)/sqrt(3)

229.

Which of the following detectors will you choose for detecting torque of a steel shaft?

a.

Synchro

b.

Strain gauge

c.

Ultrasonic gauges

d.

Pyrometer

230.

What is meant by being intrinsically safe?

a.

Product having a special writing system

b.

Electric wiring executed by approved manufacture

c.

Cannot produce enough energy to ignite a gas (explode)

d.

Any electrical product, being water resistant


37/39

231.

What is the difference between a THERMOSTAT and a TEMPERATURE TRANSMITTER, if any?

a.

The thermostat gives out an analogue signal depending on the switch setting. The

temperature transmitter gives out a binary signal depending on the temperature

b.

There is no difference

c.

The temperature transmitter is a digital component while the thermostat is an

analogue component

d.

The thermostat has one or more contacts (open or closed) depending on the

temperature/setting. The temperature transmitter converts a temperature signal

to an electric signal.

232.

What is the difference between a PRESSURE SWITCH and a PRESSURE TRANSMITTER, if any?

a.

There is no difference

b.

The pressure switch has contact(s) that will change between open and closed position. The pressure

transmitter convers a pressure signal into an electric signal

c.

The pressure switch gives out a digital signal dependent on pressure and temperature. The pressure

transmitter converts a pressure signal to a digital signal

d.

The pressure switch gives out an analogue signal depending on the switch setting. The pressure

transmitter gives out a binary signal depending on the pressure

233.

When the cable length from the temperature sensor to the place where we want to read the temperature

exceeds approx. 10 meters we normally have to, in case of a Pt 100, in some way to compensate for the cable

resistance. Do we also have to do this if we choose to use a T802 temperature?

a.

Not applicable

b.

No

c.

Yes

d.

Depends on temperature to be measured

234.

Choose the resistance R from the list A to D which allows highest possible current without exceeding 5W power

consumption.

a.

R(S) = 50 ohm

b.

R(S) = 30 ohm

c.

R(S) = 10 ohm

d.

R(S) = 25 ohm

235.

Ordinary thyristors (SCR) must often be protected against reverse overvoltage

transients because even over-voltages of extremely short duration can destroy

them. These circuits have been given such over-voltage protection, but only one

of them is correct. Which?

a.

Figure 1

b.

Figure 4c.

Figure 3

d.

Figure 2

236.

What is the purpose of the Oil Mist Detector?

a.

To detect the circulating oil

b.

To avoid suffering box leakages

c.

To detect oil mist ( explosive atmosphere in the crankcase)

d.

To avoid hot spots in crankcase


38/39

237.

In the diagram below we want to verify the resistance of the PT 100 sensor.

What is the correct calculation?

a.

R(Pt100) = R1 - R2

b.

R(Pt100) = R1 x R2

c.

R(Pt100) = R1 : R2

d.

R(Pt100) = R1 + R2

238.

This block diagram illustrates an elementary control system. What do we call

such system in general?

a.

Open loop feedback system

b.

Feed forward system

c.

Schmitt trigger

d.

Closed loop feedback system

239.

Due to the relatively low resistance of a Pt100 sensor we might have to

compensate for the cable-resistance to ensure a correct reading. Which of the 4

alternatives given is correct for the connection of this compensation resistance?a.

Figure 2

b.

Figure 4

c.

Figure 3

d.

Figure 1

240.

The diagram is a calibration diagram for a pressure gauge. What do you call

the slope of the calibration curve?

a.

Repeatability

b.

Off-set

c.

Hysteresis

d.

Sensitivity

241.

An important quantity which is useful in circuit analysis is known as conductance G

(Siemens). Which of the formulas A to D expresses the conductance for this circuit?

a.

2 R

b.

R * I

c.

1/R

d.

I/R

242.

Liquid level in tanks is often measured by measuring the hydrostatic head or

differential pressure. One method is the air bubble type which is illustrated here.

Calculate the level in tank, utilizing the figures given on the drawing.

a.

500 cm

b.

640 cm

c.

200 cm

d.

320 cm


39/39

243.

What is a ZENER BARRIER?

a.

A Zener barrier is a diode bridge used in rectifiers

b.

A Zener barrier is a device used for speed regulation on electric motors

c.

A Zener barrier is a device that allows the current to pass only one

direction

d.

A Zener barrier is a unit made to obtain intrinsically safety in

installation for instrumentation in hazardous areas.

244.

Can a ZENER BARRIER be installed in hazardous area?

a.

Yes, that’s what the Zener barrier is made for.

b.

Only if properly marked for such installation

c.

Only in equipment operating on very low voltage

d.

No, as only the output from the barrier is intrinsically safe this is not allowed

245.

This circuit is a transformer with two windings, N(1) = 2000 and N(2) =

1000 turns, on a common magnetic circuit. Assume that there are no

energy losses in the transformer itself. Calculate the output voltage V(2)

when the input voltage is V(1) = 100 Volt.a.

200 V

b.

50 V

c.

400 V

d.

10 V

246.

This is a typical emitter follower. What is the main benefit obtained by use of an

emitter follower?

a.

The input impedance is made much larger than the output impedance

b.

The input impedance is made much smaller that the output impedance

c.

The collector can be connected to as high-voltage as 10V DC

d.

The V out is always equivalent to the V in

247.

This is a simplified block diagram of a dc generator and its voltage

regulator. Find the value of the feedback constant H if the reference VR is a

45-Volt battery and the terminal voltage Vt is to be 250 Volt.

a.

0.55

b.

-0.178

c.

-11.1

d.

5.5

248.

Which method is best for determining earth failure on a 24VDC power supply?

a.

A megger-tester

b.

A lamp, (0-50 mA) and a mA-meter in series

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Electrician Test