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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 (1/2)Fmax.
 Fmax.
  (3/2)Fmax.
 3Fmax.

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Electrical Machines
Damper winding is used to

 suppress the hunting.
 decrease the load current.
 increase the load current.
 both 1 and 2.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 2.5Hz
 2HZ
 1 Hz

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 2.2 Ω
 6 Ω
 5.7 Ω
 1.9 Ω

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

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

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Electrical Machines
What are slot wedges in a DC machine made of?

 Silicon steel.
 Cast iron.
 Fibre.
 Mild steel.

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