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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.

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

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Three Phase Induction Motors
In an induction motor, no load the slip is generally

4%
Less than 1%
1.5 %
2%

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

high resistance
Large slip
Low resistance
High reactance

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Three Phase Induction Motors
In a squirrel cage rotor, the bars are not placed parallel to the shaft but are skewed to have ______

Uniform torque
Greater mechanical strength
Less rotor losses
None of the listed here

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

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

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Three Phase Induction Motors
The frame of an induction motor is usually made of

Bronze
Cast iron
Aluminium
Silicon steel

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