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Three Phase Induction Motors

Three Phase Induction Motors
When a 3-phase induction motor is at no load, the slip is ______

0.5
1
0.2
Practically zero

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Three Phase Induction Motors
A wound rotor motor is mainly used in applications where ______

Speed control is required
High starting torque is required
High rotor resistance is required during running
Less costly motor is not required

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Three Phase Induction Motors
If any two phases for an induction motor are interchanged

The motor will run in reverse direction
The motor will burn
The motor will run at reduced speed
The motor will not run

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

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

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Three Phase Induction Motors
The good power factor of an induction motor can be achieved if the average flux density in the air gap is

Small
Absent
Large
Infinity

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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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