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Three Phase Induction Motors

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

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

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Three Phase Induction Motors
The approximate efficiency of a 3-phase , 50 Hz, 4 pole induction motor running at 1350 rpm is ______

65%
40%
90%
None of the listed here

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

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

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

None of the listed here
Low resistance
High inductance
High resistance

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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

Bigger
Any of the listed here
Same
Smaller

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Three Phase Induction Motors
The shaft of an induction motor is made of

High speed steel
Cast iron
Stainless steel
Carbon steel

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