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Three Phase Induction Motors

Three Phase Induction Motors
A 3 phase induction motor is ________

Essentially a constant speed motor
A variable speed motor
Not easily maintainable
Very costly

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

None of the listed here
Provides high starting torque
Has simple and rugged construction
Provides fine speed control

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

Two
Three
None
One

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

(1+S) × rotor input
None of the listed here
(1-S) × rotor input
S × rotor input

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

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

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Three Phase Induction Motors
The condition of induction motor on load resemble those of a transformer whose secondady is _______

Supplying a variable resistive load
Short circuited
Open circuited
None of the listed here

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