THREE PHASE INDUCTION MOTORS QUIZ

The stator of a three phase induction motor produces _______ magnetic field.

None of the listed here

Alternating

Rotating

Steady

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The torque developed in the cage induction motor with auto-starter is

k/torque with direct switching

K2 Ã— torque with direct switching

k2/torque with direct switching

K Ã— torque with direct switching

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Reduced voltage starter can be used with

Squirrel cage induction motor only but not with slip ring motor

Squirrel cage as well as slip ring induction motor

Slip ring motor only but not with squirrel cage induction motor

None of these

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If an induction motor is running at slip S, then rotor output is ______

S × rotor input

(1+S) × rotor input

(S-1) × rotor input

(1-S) × rotor input

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The shaft of induction motor is made of

Hollow

Stiff

Flexible

Any of the listed here

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In a double squirrel cage induction motor, the outer cage winding has _______

High resistance

None of the listed here

High inductance

Low resistance

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The reactance of the rotor circuit of a 3-phase induction motor is maximum at

Half full load

No load

Starting

Full load

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Friction and windage loss of a 3 phase induction motor are

Maximum at no load

None of the listed here

Minimum at no load

Remains the same at all loads

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The power factor of an induction motor under no load conditions will be closer to

0.5 leading

0.2 leading

0.2 lagging

Unity

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An induction motor is so called because its operation depends on

Self induction

Hysteresis

Eddy currents

Mutual induction

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