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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 40 HZ
 50 Hz
 60 Hz
 25 Hz

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie in the inter polar gaps.
 there is no hard and fast rule for this.
 lie under south pole.
 lie under north pole.

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 switched reluctance motor.
 variable reluctance motor.
 induction motor.
 DC motor.

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 40%
 5%
 19%
 10%

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Electrical Machines
Flux density under trailing pole tips in case of generator will

 increase
None of these
 either increase or decrease
 decrease

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Electrical Machines
The direction of rotation of a DC motor can be determent by

  Flemings left hand rule.
 Flemings right hand rule.
 Amperes law.
 Lenzs law.

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