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Three Phase Induction Motors

Three Phase Induction Motors
When the rotor of a 3-phase induction motor is blocked, the slip is _____

0.1
0.5
1
0

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Three Phase Induction Motors
The speed of a squirrel cage induction motor is changed by

Cascade control
Pole changing
None of the listed here
Rheostatic control

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Three Phase Induction Motors
In an induction motor the relationship between stator slots and rotor slots is that

Stator slots are equal to rotor slots
Stator slots are exact multiple of rotor slots
Stator slots are not exact multiple of rotor slots
None of the listed here

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

300 rpm
1000 rpm
600 rpm
1200 rpm

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Three Phase Induction Motors
A 3 phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is _______

200 W
20 W
980 W
500 W

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Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

Low resistance
None of the listed here
High resistance
High inductance

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