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Three Phase Induction Motors

Three Phase Induction Motors
If a 3 phase induction motor is running at a slip S, then approximate efficiency of the motor is ______

None of the listed here
1-S
1+S
S-1

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Three Phase Induction Motors
Reduced voltage starter can be used with

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

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Three Phase Induction Motors
The starting torque of an induction motor is maximum when rotor resistance per phase is _____ rotor reactance / phase.

None of the listed here
Two times
Four times
Equal to

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Three Phase Induction Motors
The starting torque of a 3-phase induction motor is _______ supply voltage.

None of the listed here
Directly proportional to
Independent of
Directly proportional to sqaure of

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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 reactance
Large slip
high resistance

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Three Phase Induction Motors
The condition of induction motor at no load resemble those of a transformer whose secondady is _______

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

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