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Three Phase Induction Motors

Three Phase Induction Motors
In a double squirrel cage induction motor, the outer cage winding has _______

High inductance
None of the listed here
Low resistance
High resistance

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

k/torque with direct switching
k2/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.

Large slip
Low resistance
High reactance
high resistance

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Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

S/1-S
1/S
S
1-S

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

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

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Three Phase Induction Motors
A 3 phase 440 v, 50 Hz induction motor has 4% slip. The frequency of rotor emf will be

20 Hz
50 Hz
200 Hz
2 Hz

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