Single Phase Induction Motors - EEE Questions and Answers

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The direction of rotation of an hysteresis motor is determined by

A.

interchanging the supply leads

B.

position of shaded pole with respect to main pole

C.

retentivity of the rotor material

D.

none of these

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A repulsion motor is equipped with

A.

slip rings

B.

commutator

C.

both (A) and (B)

D.

none of the above

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In repulsion motor, maximum torque is developed when

A.

brush axis is at 45° electrical to the field axis

B.

brush axis coincides with the field axis

C.

brush axis is at 90° electrical to the field axis

D.

none of the above

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In repulsion motor, zero torque is developed when

A.

brush axis is 45° electrical to field axis

B.

brush axis coincides with the field axis

C.

brush axis is 90° electrical to field axis

D.

both (B) and (C)

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Which of the following motors can be used for unity power factor ?

A.

Capacitor run motor

B.

Shaded pole motor

C.

Hysteresis motor

D.

Schrage motor

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Which of the following motors is used for unity power factor ?

A.

Hysteresis motor

B.

Schrage motor

C.

Universal motor

D.

Reluctance motor

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The direction of rotation of universal motor can be reversed the by reversing the flow of current through

A.

Armature winding

B.

Field winding

C.

Either armature winding or field winding

D.

None of the above

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The wattage rating for a ceiling fan motor will be in the range

A.

200 to 250 W

B.

250 to 500 W

C.

50 to 150 W

D.

10 to 20 W