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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 30°.
 120°.
 60°.
 90°.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 1.79 Ω
 1.8 9 Ω
 3.1 Ω
 2 .1 Ω

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Electrical Machines
Under commutation results in

  no sparking.
  sparking the trailing edge of the brush.
  sparking at the middle of the brush.
  sparking at the leading edge of the brush.

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Electrical Machines
Hysteresis loss will depends on

 f²
 f1.6
 f
 f³

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Stepper motors.
  Reluctance motors.
  Induction motors.
  Universal motors.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 3
 2 alone
 1, 2 and 3
 1 and 2

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