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Three Phase Induction Motors

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

Cast iron
Aluminium
Silicon steel
Bronze

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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
Any of the listed here
Bigger
Same

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Three Phase Induction Motors
At starting of a double squirrel cage induction motor _______

Outer cage winding has good pf
Lower winding is more effective
None of the listed here
Lower cage winding has low reactance

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

High inductance
High resistance
None of the listed here
Low resistance

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Three Phase Induction Motors
Very large 3-phase induction motors (greater than 25 HP) are started _____

By auto transformer starting
Direct on line
None of the listed here
Star-delta starting

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Three Phase Induction Motors
If an induction motor is running at slip S, then rotor output is ______

(1-S) × rotor input
S × rotor input
(S-1) × rotor input
(1+S) × rotor input

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