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Three Phase Induction Motors

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

Practically zero
0.5
1
0.2

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Three Phase Induction Motors
If the air gap between the rotor and stator of a 3-phase induction motor is increased, then_______

Leakage reactances are increased
Leakage reactances are decreased
No load current is decreased
None of the listed here

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Three Phase Induction Motors
A 3 phase induction motor is ________

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

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Three Phase Induction Motors
An induction motor is so called because its operation depends on

Hysteresis
Mutual induction
Eddy currents
Self induction

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

0.1
1
0
0.5

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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
None of the listed here
Open circuited

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