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Three Phase Induction Motors

Three Phase Induction Motors
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1200 rpm
2400 rpm
400 rpm
1600 rpm

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

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

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Three Phase Induction Motors
In an induction motor the relationship between stator slots and rotor slots is that

None of the listed here
Stator slots are exact multiple of rotor slots
Stator slots are equal to rotor slots
Stator slots are not exact multiple of rotor slots

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Three Phase Induction Motors
The maximum torque in an induction motor depends on

Rotor inductive reactance
Square of supply voltage
Frequency
All of the listed here

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Three Phase Induction Motors
An induction motor is preferred to a dc motor because it _______

Has simple and rugged construction
Provides high starting torque
None of the listed here
Provides fine speed control

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Three Phase Induction Motors
An induction motor is

Self starting with low torque
Self starting with zero torque
Non self starting
Self starting with high torque

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