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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 either increase or decrease
None of these
 decrease
 increase

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Shunt motor.
  Differential compound motor.
  Cumulative compound motor.
  Series motor.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 cummulative compound motor.
  series motor.
 shunt motor.
 AC synchronous motor.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 V²
 V
 f²

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 57.1%.
 59.2%.
 48.0%.
 88.8%.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 windage and friction loss
 core loss only
 Copper loss
 both 1 and 2

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