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Electrical Machines

Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 40
 660
 60
 600

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 has no relation.
 inversely.
 none of these.
 directly.

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Electrical Machines
Which of the following voltage regulator is preferred for providing large values of load current?

  Zener diode shunt regulator.
  Transistor series regulator.
None of these
  Transistor shunt regulator.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 45°
 10°
 60°
 30°

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 25 %.
  10 %.
 50 %.
 15 %.

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

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

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