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Shunt Motors Speed MCQ Questions & Answers

Shunt Motors Speed MCQs : This section focuses on the "Shunt Motors Speed". These Multiple Choice Questions (MCQs) should be practiced to improve the Shunt Motors Speed skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

A 16-pole, 3-phase, 60 Hz induction motor is operating at a speed of 150 rpm. The frequency of the rotor current of the motor in Hz is __________

A. 20
B. 40
C. 30
D. 10

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Question 2

A 3-phase induction machine draws active power P and reactive power Q from the grid. If it is operated as a generator, then P and Q will be _________

A. Positive and Negative
B. Negative and Positive
C. Positive and Positive
D. Negative and Negative

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Question 3

Calculate mark to space ratio if the system is on for 26.3 sec and off for 24.2 sec.

A. 1.086
B. 1.042
C. 1.214
D. 1.876

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Question 4

Calculate the active power in a .154 H inductor.

A. 22 W
B. 14 W
C. 45 W
D. 0 W

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Question 5

Calculate the amplitude of the sinusoidal waveform z(t)=715sin(165?t+2?÷468).

A. 710
B. 715
C. 716
D. 718

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Question 6

Calculate the time period of the waveform z(t)=24sin(?t+?÷4)+4sin(2?t+?÷6).

A. 2 sec
B. 3 sec
C. 4 sec
D. 1 sec

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Question 7

Calculate the total heat dissipated in a resistor of 50 ? when 1.4 A current flows through it.

A. 98 W
B. 92 W
C. 91 W
D. 93 W

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Question 8

If induction motor air gap power is 10 KW and mechanically developed power is 8 KW, then rotor ohmic loss will be _________ KW.

A. 1
B. 2
C. 3
D. 4

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Question 9

If induction motor air gap power is 48 KW and gross developed power is 28 KW, then rotor ohmic loss will be _________ KW.

A. 10
B. 20
C. 30
D. 40

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Question 10

The advantage of the double squirrel cage induction motor over a single cage rotor is that its _______

A. Efficiency is higher
B. Power factor is higher
C. Slip is larger
D. Starting current is lower

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Question 11

The power factor of a squirrel cage induction motor is ___________

A. Low at light load only
B. Low at heavy loads only
C. Low at the light and heavy loads both
D. Low at rate load only

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Question 12

The short circuit test on a 3-? induction motor is conducted at a rotor speed of _______

A. Zero
B. < Ns
C. > Ns
D. Ns

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Question 13

The slope of the V-I curve is 39.1°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

A. .81 ?
B. .36 ?
C. .75 ?
D. .84 ?

View Answer

Question 14

Calculate the amplitude of the sinusoidal waveform z(t)=715sin(165πt+2π÷468).

A. 710
B. 715
C. 716
D. 718

View Answer

Question 15

Calculate the time period of the waveform z(t)=24sin(πt+π÷4)+4sin(2πt+π÷6).

A. 2 sec
B. 3 sec
C. 4 sec
D. 1 sec

View Answer

Question 16

Calculate the total heat dissipated in a resistor of 50 Ω when 1.4 A current flows through it.

A. 98 W
B. 92 W
C. 91 W
D. 93 W

View Answer

Question 17

The short circuit test on a 3-φ induction motor is conducted at a rotor speed of _______

A. Zero
B. < Ns
C. > Ns
D. Ns

View Answer

Question 18

The slope of the V-I curve is 39.1°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

A. .81 Ω
B. .36 Ω
C. .75 Ω
D. .84 Ω

View Answer