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Three Phase Induction Motors

Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

Three
None
Two
One

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will burn
The motor will run at reduced speed
The motor will not run
The motor will run in reverse direction

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

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

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Silicon steel
Bronze
Aluminium
Cast iron

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Three Phase Induction Motors
A wound rotor motor is mainly used in applications where ______

High rotor resistance is required during running
Speed control is required
High starting torque is required
Less costly motor is not required

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Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

0.5
1
Practically zero
0.2

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