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Three Phase Induction Motors

Three Phase Induction Motors
The full load slip of a 3-phase induction motor ranges from

2 to 5 %
None of the listed here
20 to 30 %
10 to 20 %

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Three Phase Induction Motors
Less maintenance troubles are experienced in case of

None of these
Slip ring induction motor
Both (A) and (B)
Squirrel cage induction motor

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Three Phase Induction Motors
In an induction motor if air gap increased

Copper loss will reduce
Windage losses will be more
The power factor will be low
Bearing friction will reduce

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Three Phase Induction Motors
If the rotor slots are made deeper, rotor resistance is ______

None of the listed here
Increased under running conditions
Increased at starting
Decreased at starting

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

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Three Phase Induction Motors
The rotor of an induction motor runs at

Synchronous speed
Above synchronous speed
Any of the above
Below synchronous speed

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