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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Armature.
 Field.
 Coupling mounted on the shaft.
 Motor frame.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

 2 mg of KOH / gm.
 0.5 mg of KOH / gm.
  0.3 mg of KOH / gm.
  1 mg of KOH / gm.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with increase in the load torque.
 increases with increase in the load torque.
 remains constant.
 decreases with decrease in the load torque.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K²R1
 R1 /K²
 R1 /K
 K×R1

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

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

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 1/2*ωm
 ωe = ωm
 ωe = 2*ωm
 ωe = 4*ωm

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