ECI - UNIT 1 mark

8/9/2019 ECI - UNIT 1 mark

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ELECTRICAL CIRCUITS AND INSTRUMENTATION

24032-ELECTRICAL CIRCUITS AND INSTRUMENTATION

UNIT I -- D.C. CIRCUITS AND THEOREMS

Definition and unitfor voltage, current, power, resistance, conductance, resistivity ohms law only simple problems

in ohms law- Kirchoffs current law and voltage law. Series circuits parallel circuits series parallel circuits

Thevenins, Nortons, super position and maximum power transfer theorem Statement and explanation ( simple

problems two sources with four resistors).

UNIT II -- A.C. CIRCUITS AND RESONANCE

A.C. CIRCUITS : AC through single pure resistance, pure inductance, pure capacitance - voltage and current

relationship - and (to mention only) the equation for power and power factor in each case ( only simple

problems).Definition for impedance, reactance, admittance, conductance, phase angle, power factor and power. AC

circuits Derivation only for impedance, power and power factor in Series R-L, R-C, R-L-C circuits. Analysis of

Parallel R-L circuit, R-C circuit, R-L-C circuit (qualitative treatment only )

RESONANCE: Resonance - series resonance parallel resonance - condition for resonance resonant frequency- Q

factor - resonance curve - bandwidth (only simple problems).

UNIT III -- TRANSFORMERS AND MACHINES

TRANSFORMERS :Transformer Ideal transformer construction - working principle

EMF equation -Losses intransformer- core loss, copper loss- Efficiency- Regulation- OC, SC test on transformer List of applications (qualitative

treatment only )

MACHINES : D.C Machines - DCGenerator Working principle - Types-Applications - DC motor- working principle -

types- applications (qualitative treatment only). Single phase Induction motor-Types- construction & principle of

operation of capacitor start induction motor- Applications- stepper motor-working principle-uses (qualitative treatmen

only).

UNIT IV -- MEASURING INSTRUMENTS AND CRO

MEASURING INSTRUMENTS: Indicating instruments Basic forces for indicating instruments- construction and

operation of permanent magnet moving coil Instrument-Advantages Disadvantages of PMMC -Shunts and Multipliers-

DC ammeter-DC volt meter-volt meter sensitivity. Bridges- Types - Wheat stone bridge - applications Universalimpedance bridge arrangements to measure R,L,C.

CRO : CRO - Block diagram and principle of operation of CRO- operation of CRT -Electrostatic focusing- Electrostatic

deflection (no derivation) - Block diagram of vertical deflection system- Applications of CRO- Types of CRO- Block

diagram and operation of dual trace CRO- dual beam CRO comparison between dual trace and dual beam CRO Digital

storage oscilloscope Block diagram- advantages.

UNIT V: RECORDERS, TRANSDUCERS & TEST INSTRUMENTS

RECORDERS: Recorders Types- X-Y recorder Strip chart recorder list ofapplications - comparison between X-Y

recorder and strip chart recorder.

TRANSDUCERS: Transducers classification of transducer-Strain gauge - Types-uses. Construction, operation and

applications of photo electric transducer, LVDT and Load cell. Principle of working of thermocouple-Temperaturemeasurement using thermocouple list of applications- Principle of working of Thermistor Temperature measurement

using thermistors Types (NTC, PTC) List of applications .

TEST INSTRUMENTS: Digital voltmeter Types ( to list only ) - Basic block diagram of DVM Block diagram of

Digital multi meter- Advantages over analog instruments-Block diagram of Digital frequency counter- Simple PC based

Data Acquisition system Block diagram.


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ELECTRICAL CIRCUITS AND INSTRUMENTATION Unit - I

24035 - ELECRICAL CIRCUITS AND INSTRUMENTATION PRACTICAL

Course Name : Electronics and Communication Engineering

Subject code : 24035Semester : III SemesterSubject title : Electrical Circuits And Instrumentation Practical

Allocation of marksCircuit Diagram : 20Connection : 25Execution & Handling Of Equipment : 15

Output / Result : 10Viva Voce : 05

_________________________________________________Total : 75

LIST OF EXPERIMENTSNote:

1. All students must have his own soldering iron and multimeter2. At least 10 experiments should be constructed using breadboard / soldering

3. Different component value should be given for EACH batch of students.1.

Construct a circuit to verify ohms law2. Construct a circuit to verify kirchoffs voltage and current law

3. Construct a circuit to verify super position theorem4. Construct a circuit to verify Thevenins Theorem5. Construct a circuit to verify Nortons Theorem6.

Construct a circuit to verify maximum power transfer Theorem7. Construct and test the performance of series resonant circuit and parallel resonant circuit

8. Calibrate the given ammeter and voltmeter9. Extend the range of given voltmeter and ammeter10.Construct and test the performance of Wheatstone bridge11.

Measure the amplitude and frequency of signals using dual trace CRO12.Measure the frequency and phase angle using CRO by Lissajous figure

13.Measure voltage and current using CRO14.Test the performance of LVDT15.Measure strain using strain gauge.16.Determine the characteristics of a thermistor17.Test the performance of a load cell

18.Construct and test the performance of a photo electric transducerSubject Attendance(Award of marks for subject attendance to each subject Theory/Practical will be as per the range given below)

80% - 83% 1 Marks84% - 87% 2 Marks88% - 91% 3 Marks92% - 95% 4 Marks96% - 100% 5 Marks

~~ALL THE BEST~~ Sukesh.R Lec/ECEGRG Polytechnic College, Coimbatore.


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UNIT I --- D.C. CIRCUITS AND THEOREMS

1.Define current and mention its unit.

Flow of electronsin a conductor is called current ,It is represented by Iand its unit is amphere(A).

2. Define power and mention its unit.

Power is rate of doing work. (OR) Product of voltage and current. P= V* I. Unit is Watts(W).

3. Define amphere.

Motion of electric charge at the rate of coulomb/sec.

4.Define voltage or potential difference.

The difference of potentials between two pointsis called potential difference (voltage). It is represented by V. Its unit is

Volt.

5.Define resistance.

The opposition offered to the flow of current by a substance is called resistance. It is represented byRand its unit is

ohm().

6. Mention laws of resistance OR Mention the factors affecting resistance.

Resistance is 1.directly proportional tolength(l), 2.Inversly proportional to area(a), 3.depends on material, 4.depends

on temperature. R=l/ a

7. Define conductance.

Conductance isReciprocal of resistance. Represented by letter Gand its unit is mho().

8. Define Energy.

Energy is capacity to do the work(OR)product of power and time. It is represented by E its unit is Watts/sec.

E=P*t

9.State ohms law.

At constant temperature, the current flowing through a conductor is directly proportional to the potential difference

(voltage)between the two ends of the conductor. V= IR.

10.State the two types of Kirchoffs laws.

Kirchoffs current law

Kirchoffs voltage law

11.State Kirchoffs current law.

The algebraic sum of currents at a junction (node) is zero. (or) the sum of currents flowing towards a junctionis equal to

the sum of currents flowing away from the junction.

Sum of incoming current to a junction= sum of outgoing current from a junction

12.State Kirchoffs voltage law.

The algebraic sum of voltage in a closed circuit is equal to zero.

Sum of voltage drops = Sum of EMF source(supply) OR Sum of voltage drops +Sum of EMF source(supply)=0



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13.Give the expression of power.

P=V*I OR P=I2R OR P=V

2/ R

14.Give the equivalent resistance expression for resistor connected in series.

Req = 1 +2 +3

15.Give the equivalent resistance expression for resistor connected in parallel.

Req=12

1+2

16.State Super position theorem.

In a network containing two or more EMF sources the current in any resistor is equal to the algebraic sum of the separate

currents in the resistor when each source acts separately.

17.State Thevenins theorem.

Any two terminal networks can be replaced by a voltage source in series with the resistance .

18. State Nortons theorem.

Any two terminal networks can be replaced by a current source IN in parallel with the resistance RN.

IN = short circuit current at AB RN = resistance of the network

19.State maximum power transfer theorem

In a network containing EMF source and load resistor then the maximum power will be transfer from source to load when

the load resistor is equal to the internal resistanceof the circuit.

19. What is the condition for maximum power transfer?

To transfer maximum power

Load resistor = Source(internal) resistor RL= Rs.

20.Give the formula for finding load current in Nortons circuit.

IL=

+

21.Give the formula for finding load current in Nortons circuit.

IL=

+

22.Draw the Thevenins equivalent circuit.

23.Draw the Nortons equivalent circuit.

RNLoad

IN

RNIN

RL

Vth

Rth

Load

Load

RL



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22.Write the equation for maximum power.

Pmax=

25.Draw the equivalent circuit of Maximum power transfer theorem.

Part B----- 12 Marks

1.

Explain Ohms law. (4 Marks)

2. Explain kirchoffs law. (8 marks)

3. Derive the equation for series and parallel circuit.

4.

Write & Explain the step by step procedure of Theveniss theorem.

5. Write & Explain the step by step procedure of Nortons theorem.

6.

Write & Explain the step by step procedure of super position theorems theorem

7.

Write the equation for Maximum power transfer theorem.

8. Problems on Theorems

Vth

Rth

LoadVs

RsLoad

RL Rs=RL


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ECI - UNIT 1 mark