MONTHLY TEST OF JANUARY

1.A capacitor start single phase induction motor will usually have power factor of

• a) Units
  

• b) 0.6 leading

• c) 0.8 leading

• d) 0.6 lagging

Which of the following single phase motors is cheapest?

• a) Capacitor run motor
  

• b) Capacitor start motor

• c) Reluctance motor

• d) All have almost the same cost

Which of the following single phase motors does not have constant speed characteristic?

• a) Reluctance motor
  

• b) Hysteresis motor

• c) Universal motor

• c) Universal motor

For the same rating which of the following motors has the highest starting torque?

• a) Universal motor
  b) Split phase motor
  c) Synchronous motor
  d) All have identical starting torque

• b) Split phase motor

• c) Synchronous motor

• d) All have identical starting torque

The speed of the split phase induction motor can be reversed by reversing the leads of

• a) Auxiliary winding
  

• b) Main winding

• c) Either (a) or (b)

• c) Either (a) or (b)

The rotor of a salient pole alternator has 12 poles. The number of cycles of emf per revolution would be.....................

......................is used as a exciter for a generator.

In alternators, .......................... is generally used with prime movers for high speed applicaton.

As the speed of an alternator increases, the frequency will be .................

The number of electrical degrees passed through in one revolution of a four pole synchronous alternator is