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MCQs on Special Motor

May 5, 2017 by admin

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1. If we interchange the supply terminals of an universal motor, then the rotor will
(a) fail to start.
(b) rotate in reverse direction.
(c) run in same direction.
(d) burn out.    

Answer

           C 

 2. When an universal motor is operating in no load condition, its speed is laminated by
(a) armature resistance.
(b) field resistance.
(c) winding and friction.
(d) armature reaction.          

Answer

           C 

 3. For starting a schrage motor, three phase supply is connected to
(a) stator.
(b) rotor.
(c) commutator.
(d) none of the above.     

Answer

           B 

  4. Linear induction motor is used in
(a) conveyors.
(b) elevators.
(c) Accelerator.
(d) traction.           

Answer

           D 

 5. In a hysteresis motor, the hysteresis losses at standstill condition are
(a) minimum.
(b) maximum.
(c) very high.
(d) same at all speed.   

Answer

           A 

 6. Reluctance motor operates on
(a) DC only.
(b) AC only.
(c) both DC and AC.
(d) none of the above.            

Answer

           B 

 7. When the armature reaction effect in and AC series motor increases, its speed is
(a) increases.
(b) decreases.
(c) remain unchanged.
(d) none of the have.    

Answer

           A 

 8. In hysteresis motor, the rotor carries a layer of special magnetic material that must have
(a) non magnetic nature.
(b) zero hysteresis loop.
(c) low hysteresis loop.
(d) high hysteresis loop.       

Answer

           D 

 9. Efficiency of a universal motor is more which operates on
(a) AC.
(b) DC.
(c) either AC or DC.
(d) none of the above.       

Answer

           B 

You may also read
• Why all the voltage levels are multiples of 11 kV?
• Why Motor rated in kW instead of kVA?

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