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Three Phase Induction Motors

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

Rotor current
Rotor power factor
Rotor emf
Shaft diameter

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Three Phase Induction Motors
The advantage of wound rotor motor is that _______

External resistance can be inserted in the rotor circuit
It requires less maintenance
None of the listed here
It is inexpensive

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Three Phase Induction Motors
The injected e.m.f. in the rotor of induction motor must have

Zero frequency
The same phase as the rotor e.m.f.
The same frequency as the slip frequency
High value for the satisfactory speed control

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Three Phase Induction Motors
The starting torque of a squirrel cage induction motor is

Slightly more than full load torque
Low
Negligible
Same as full load torque

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Three Phase Induction Motors
Slip rings are usually made of

Copper
Phospor bronze
Aluminium
Carbon

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Three Phase Induction Motors
The stator of a three phase induction motor produces _______ magnetic field.

Alternating
Steady
None of the listed here
Rotating

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