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Three Phase Induction Motors

Three Phase Induction Motors
For higher efficiency of 3-phase induction motor, the slip should be

Very large
As small as possible
Large
1

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Three Phase Induction Motors
The air gap between stator and rotor of 3-phase induction motor ranges from ______

0.4 mm to 4 mm
2 cm to 4 cm
4 cm to 6 cm
1 cm to 2 cm

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Three Phase Induction Motors
If the supply voltage of a 3-phase induction motor is increased two times, then torque is _______

Decreased four times
Increased two times
Increased four times
Decreased two times

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Three Phase Induction Motors
The torque developed by a 3 phase induction motor least depends on

Rotor emf
Rotor current
Shaft diameter
Rotor power factor

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

0.5
1
0.1
0

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

Rheostatic control
Pole changing
None of the listed here
Cascade control

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