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Three Phase Induction Motors

Three Phase Induction Motors
In induction motor, percentage slip depends on

Supply voltage
None of these
Copper losses in motor
Supply frequency

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Three Phase Induction Motors
If a 4 pole induction motor has a synchronous speed of 1500 rpm, then supply frequency is _____

60 Hz
None of the listed here
50 Hz
25 Hz

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

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

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Three Phase Induction Motors
Friction and windage loss of a 3 phase induction motor are

Maximum at no load
None of the listed here
Remains the same at all loads
Minimum at no load

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Three Phase Induction Motors
Slip rings are usually made of

Phospor bronze
Copper
Aluminium
Carbon

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Three Phase Induction Motors
The torque developed in the cage induction motor with auto-starter is

K × torque with direct switching
k2/torque with direct switching
k/torque with direct switching
K2 × torque with direct switching

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