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Three Phase Induction Motors

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

0.1
0.5
1
0

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Three Phase Induction Motors
In an induction motor the relationship between stator slots and rotor slots is that

Stator slots are equal to rotor slots
Stator slots are not exact multiple of rotor slots
None of the listed here
Stator slots are exact multiple of rotor slots

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

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

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

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Three Phase Induction Motors
The 3- phase induction motor is so designed that the rotor should have ______ under running conditions.

Low resistance
high resistance
Large slip
High reactance

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

One
Three
Two
None

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