nptel.ac.in · 2018-11-09 · 160 N-m, when the rotor emf makes 120 complete cycles per minute. The power output (in kW) is 17.8-18.2 16.8-17.2 18.8-19.2 15.8-16.2 No, the answer

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Quiz :Assignment0

Due on 2018-07-31, 23:59 IST.

1) 1 point

2) 1 point

Assignment0The due date for submitting this assignment has passed.

As per our records you have not submitted this

assignment.

At a certain dc current, the energy stored in an iron cored coil is 1000J and its copper loss

is 2000W. The time constant (in seconds ) of the coil is

0.25

0.5

1.0

2.0

No, the answer is incorrect.

Score: 0

Accepted Answers:

1.0

Current through and voltage across a device are given in figure. Energy (approximate)

absorbed by

the device

(in J) in the

interval 0≤t≤ 2 sec is

8.5-8.7

9.9-10.1

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3) 1 point

4) 1 point

5) 1 point

6) 1 point

8.5-8.7

Find V0 (in V) in the circuit shown in the figure.

2.5-3.0

3.0-3.5

3.5-4.0

4.0-4.5

No, the

answer is

incorrect.

Score: 0

Accepted

Answers:

3.5-4.0

In the figure shown, the initial capacitor voltage is zero. The switch is closed at t=0, the final

steady-state voltage (in V) across the capacitor is

0

5

20

10

No, the answer is

incorrect.

Score: 0

Accepted Answers:

10

An abc-sequence set of voltages feeds a balanced three-phase star-star connected

system. The line and load impedances are (0.5+j0.75) ohms and (20-j24) ohms respectively. If the

load voltage of the a-phase is VAN = (172.34+j30.39) Vrms . Find out the magnitude of the line voltages

( in V) of the source.

181-200

201-220

221-230

231-240


Score: 0

Accepted Answers:

201-220

A 50 ohms resistor is connected in series with an inductor having internal resistance, a

capacitor and 100V variable frequency supply as shown in the figure. At a frequency of 200 Hz, a

maximum current of 0.7 A flows through the circuit and voltage across the capacitor is 200V. Determine

the inductance (in mH) of the inductor.



7) 1 point

8) 1 point

222-232

407-417

148-158

583-593


Score: 0

Accepted Answers:

222-232

In the network shown in the given figure, if the voltage V at the time considered is 20V, then

dV/dt (in V/s) at that time will be

1

2

-2

0

No, the

answer is

incorrect.

Score: 0

Accepted

Answers:

2

The impedance (in ohms) seen by the source in the circuit in the figure shown is given by



9) 1 point

10) 1 point

(0.54+j0.313)

(4-j2)

(4.54-j1.69)

(4+j2)


Score: 0

Accepted Answers:

(4.54-j1.69)

A 6-pole 50Hz, 3-phase induction motor running on full load develops a useful torque of

160 N-m, when the rotor emf makes 120 complete cycles per minute. The power output (in kW) is

17.8-18.2

16.8-17.2

18.8-19.2

15.8-16.2


Score: 0

Accepted Answers:

15.8-16.2

A single phase transformer has a maximum efficiency of 90% at full load and unity power

factor. Efficiency (in % ) at half load and 0.8 lagging power factor is

85.0-85.5

85.5-86.0

86.0-86.5

86.5-87.0


Score: 0

Accepted Answers:

85.0-85.5

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nptel.ac.in · 2018-11-09 · 160 N-m, when the rotor emf makes 120 complete cycles per minute. The power output (in kW) is 17.8-18.2 16.8-17.2 18.8-19.2 15.8-16.2 No, the answer