Q.161 A 4 pole, 50 Hz induction motor has a rotor resistance of 0.3 Ω and standstill reactance of 1.2 Ω. What is the value of speed at maximum torque?
A. 1100 rpm

B. 1025 rpm

C. 1125 rpm

D. 112 rpm
Ans.: C

Q.162 Basically the booster are
A. Capacitors

B. Synchronous Motor

C. Inductors

D. Transformer
Ans.: D

Q.163 Power system stability is least affected by
A. Input torque

B. Losses

C. Reactance of generator

D. Reactance of transmission line
Ans.: B

Q.164 Corona is likely to occur maximum in
A. Transmission line

B. Domestic wiring

C. Distribution line

D. All of the above
Ans.: A

Q.165 In induction motors, the length of air gap is kept as small as possible is order to have
A. High over load capacity

B. Low power factor

C. High power factor

D. Any of the above
Ans.: C
Q.166 Power transformers have rating
A. Equal to 100 kVA

B. Equal to 50 kVA

C. Above 200 kVA

D. None of the above
Ans.: C

Q.167 Tap changing facility is generally provided on
A. Distribution transformer

B. Current transformer
C. High voltage transformer

D. power transformer
Ans.: D

Q.168 Which of the following are integrating instruments?
A. voltmeters

B. Ammeters

C. Watt meters

D. Ampere-hour and watt-hour meters
Ans.: D

Q.169 Which of the following limits the output of a rotating electrical machine?
A. Size of the machine

B. Temperature rise

C. Peripheral velocity

D. None of the above
Ans.: B

Q.170. A large value of short circuit current indicates
A. poor power factor

B. Zero power factor

C. Good power factor

D. none of the above
Ans.: C

Q.171 A Potentiometer may be used for
A. Measurement

B. Calibration of ammeter and voltmeter
C. measurement of resistance

D. All of the above
Ans.: D

Q.172 An ammeter is a
A. Absolute instrument

B. Recording instrument
C. Integrating instrument

D. secondary instrument
Ans.: D

Q.173 The function of shunt in an ammeter is to
A. By pass the current

B. Increase the sensitivity of the ammeter
C. Increase the resistance of ammeter

D. None of the above
Ans.: A

Q.174 The initial response when the output is not equal to input is called
A. Error response

B. Transient response

C. Dynamic response

D. Either of the above
Ans.: B

Q.175 _______ signal will become zero when the feedback signal and reference signal are equal.
A. Feedback

B. Input

C. Actuating

D. reference
Ans.: C


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