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Three Phase Induction Motors

Three Phase Induction Motors
The rotor winding of a 3phase wound rotor induction motor is generally _______ connected.

Partly star and partly delta
None of the listed here
Delta
Star

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Three Phase Induction Motors
In a squirrel cage induction motor, the number of stator slots is _______ rotor slots.

Always eqaul to the number of
Always less than the number of
Either more or less than the number of
Always greater than the number of

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Three Phase Induction Motors
Reduced voltage starter can be used with

Squirrel cage as well as slip ring induction motor
Slip ring motor only but not with squirrel cage induction motor
Squirrel cage induction motor only but not with slip ring motor
None of these

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Three Phase Induction Motors
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

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

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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
Size of a high speed motor as compared to low speed motor for the same HP will be

Smaller
Same
Bigger
Any of the listed here

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