Single Phase Induction Motors - Interview Questions | Exam2Win

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81. Speed control of a universal motor is achieved by

A. varying field flux with tapped field windings

B. connecting rheostat in series

C. applying variable voltage by means of silicon controlled rectifier

D. applying variable voltage by means of variable auto-transformer

Explanation:

82. Burning out of windings is due to

A. short circuited capacitor

B. capacitor value hiving changed

C. open circuiting of capacitor

D. none of the above

Explanation:

83. A universal motor is one which

A. can be operated either on D.C. or A.C. supply at approximately the same speed and output

B. can be marketed internationally

C. runs at dangerously high speed on no-load

D. can be operated either on D.C. or A.C. supply at approximately the same speed and output

Explanation:

84. To reverse the direction of rotation of acapacitor start motor while it is running we should

A. disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding

B. disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding

C. reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply

D. reverse the direction of connections of the auxiliary winding and im-mediately connect it to supply

Explanation:

85. Which of the following motors is used in tape-recorders ?

A. Hysteresis motor

B. Reluctance motor

C. Capacitor-run motor

D. Universal motor

Explanation: