7000+ Synchronous Machines MCQ Questions & Answers Pdf - 2

Question: 6

Which of the following is not the disadvantage of a synchronous motor?

(A) It has the tendency to hunt

(B) Its starting under load is not possible

(C) It is unsuitable for line shaft drive in a small workshop

(D) Its torque is less sensitive to variations in supply voltage

Question: 7

Number of slip rings in a 3-phase synchronous motor will be

(A) 1

(B) 3

(C) 2

(D) 3 or 4

Question: 8

A polyphase field is

(A) Constant in amplitude and stationary in space

(B) Constant in amplitude and rotating at synchronous speed

(C) Pulsating and rotating

(D) Pulsating and stationary

Question: 9

The salient pole rotors are not suitable for high speed turbo generators due to

(A) Excessive bearing friction

(B) Large eddy current losses

(C) Undesirable mechanical oscillation

(D) High centrifugal force and windage loss

Question: 10

The current from the stator of an alternator is taken out to the external load circuit through

(A) Carbon brushes

(B) Solid connections

(C) Commutator segments

(D) Slip rings