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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 0KVA
 4KVA
 16KVA

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

  Stepper motor.
 Shaded pole motor.
 Hysteresis motor.
 Reluctance motor.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

  rate of change of flux is maximum.
 rate of change of flux is minimum.
 induced voltage is high.
 shaft rotation is high.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 65 V
 115 V
 460 V
 230 V

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Electrical Machines
Which of the following will vary the maximum torque?

None of these
 both 1 and 2
 rotor reactance X
 rotor resistance R

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 oscillating
 pulsating and unidirectional
None of these
 steady and unidirectional

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