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Electrical Machines

Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

  zero.
 low.
 negative.
 positive.

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Electrical Machines
Damper winding is used to

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

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sp²
 PZL/4S
 PZL/ 4Sa
 PZL/4Sa²

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero, 950 rpm.
 1000 rpm, - 50 rpm.
 zero , - 50 rpm.
 1000 rpm, 950 rpm.

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Electrical Machines
Induction motors have the advantage of

  all of below.
  less cost.
  less maintenance.
  simple in construction.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 650 W
 600 W
 700 W
 625 W

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