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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
 above rated speed
None of these
 below rated speed

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 50 V
 zero
 20 V
 40 V

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 somewhat less than 220 V
 6 V
 more than 220 V
 220 V

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Remains unchanged.
 Increases.
  Decreases.
 Oscillates around the rated speed.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque increases
 more and maximum torque remains constant
 less and maximum torque decreases
 more and maximum torque decreases

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Electrical Machines
A crusher is equipped with

 Synchronous motor.
 Reluctance motor.
 Slip ring induction motor.
 DC shunt motor.

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