3 - Phase Synchronous Generator - Electrical Engineering (MCQ) questions and answers

1)   The number of cycles of the induced emf per second is equal to

a. No. of cycles per revolutions x no. of revolutions per second
b. No. of cycles per second x no. of revolutions per second
c. No. of cycles per revolutions x no. of revolutions per hour
d. No. of cycles per revolutions / no. of revolutions per second
Answer  Explanation 

ANSWER: No. of cycles per revolutions x no. of revolutions per second

Explanation:
No explanation is available for this question!
2)   Short pitched windings are mainly used because it

a. Gives better waveform of the generated emf
b. Eddy current and hysteresis losses are reduced
c. Less copper is used
d. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
3)   The non salient pole type synchronous generator is driven by

a. Hydraulic turbines
b. Diesel engines
c. Steam engines
d. All of these
Answer  Explanation 

ANSWER: Steam engines

Explanation:
No explanation is available for this question!
4)   In India, the synchronous generator generates

a. 11 kilo - volts
b. 33 kV
c. 66 kV
d. Either (a) or (b)
Answer  Explanation 

ANSWER: Either (a) or (b)

Explanation:
No explanation is available for this question!
5)   The synchronous generator is also called an

a. AC generator
b. Alternator
c. DC generator
d. Only (a) and (b)
Answer  Explanation 

ANSWER: Only (a) and (b)

Explanation:
No explanation is available for this question!
6)   From full load to no load, the change of terminal voltage is more in case of

a. Lagging power factor
b. Leading power factor
c. Unity power factor
d. Both lagging and leading power factor compared to unity power factor
Answer  Explanation 

ANSWER: Both lagging and leading power factor compared to unity power factor

Explanation:
No explanation is available for this question!
7)   If Kf, Kc and Kd are the coefficient of form factor, pitch factor and distribution factor respectively then the rms value of induced emf per phase is given by

a. KfKcKd f ∅T
b. 1.414KfKcKd f ∅T
c. 4KfKcKd f ∅T
d. 1.11KfKcKd f ∅T
Answer  Explanation 

ANSWER: 4KfKcKd f ∅T

Explanation:
No explanation is available for this question!
8)   The number of conductors in synchronous generators is equal to

a. The number of turns per phase
b. Twice the number of coils per phase
c. Half of the number of coils per phase
d. None of these
Answer  Explanation 

ANSWER: Twice the number of coils per phase

Explanation:
No explanation is available for this question!
9)   Salient pole type motors have

a. Large diameter and large axial length
b. Small diameter and small axial length
c. Large diameter and small axial length
d. Small diameter and large axial length
Answer  Explanation 

ANSWER: Large diameter and small axial length

Explanation:
No explanation is available for this question!
10)   In case of a synchronous generator, armature winding and field winding are

a. Both stationary
b. Stationary, rotating
c. Rotating, stationary
d. Both rotating
Answer  Explanation 

ANSWER: Stationary, rotating

Explanation:
No explanation is available for this question!

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