Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-1

1.The advantage of salient poles in an alternator is

a) Reduced windage loss
b) Reduced noise
c) Reduced bearing loads and noise
d) Adaptability to low and medium speed operations

Ans: (d)

2. The emf generated in alternator depends on

a) Frequency
b) Flux per pole
c) Coil span factor
d) All of these

Ans: (d)

3. The rotor of a salient pole alternator has 12 poles. The number of cycles of emf per revolution would be

a) 4
b) 3
c) 6
d) 12

Ans: (c)

4. Salient pole type rotors are

a) Larger in diameter and smaller in axial length
b) Larger in diameter and larger in axial length
c) Smaller in diameter and larger in axial length
d) Smaller in diameter and smaller in axial length

Ans: (a)

5. The exciter for a generator is a

a) Shunt motor
b) Series motor
c) Shunt generator
d) Compound motor

Ans: (c)

6. The frequency of voltage generated in an alternator depends on

a) Number of poles
b) Speed of alternator
c) Both (a) and (b)
d) Type of winding

Ans: (c)

7. The frequency per pole in an alternator is equal to

a) Number of poles
b) Number of armature conductors
c) Number of pair of poles
d) None of these

Ans: (c)

8. In alternators, cylindrical pole type rotors are generally used with prime movers of

a) High speed
b) Low speed
c) Medium speed
d) Both low and high speed

Ans: (a)

9. An alternator is said to be overexcited when it is operating at

a) Unity power factor
b) Leading power factor
c) Lagging power factor
d) Either lagging or leading power factor

Ans: (b)

10. In alternators, salient pole type rotors are generally used with prime movers of

a) Low speed
b) Medium speed
c) High speed
d) Any speed

Ans: (a)

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Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-1

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