MCQs on Special Motor

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 1. A single phase induction motor which has the lowest speed is
(a) universal.
(b) hysteresis.
(c) repulsion.
(d) shaded poles.    

 2. Which of the following motor is used in high speed application?
(a) shaded pole motor.
(b) hysteresis motor.
(c) universal motor.
(d) repulsion motor.  

 3.  The phase difference between two windings of AC Servo Motor is
(a) 60°.
(b) 90°.
(c) 120°.
(d) 180°.  

 4. The operation of stepper motor at higher speed is expressed in term of
(a) crawling.
(b) jogging.
(c) slewing.
(d) running.  

 5. The input signal to a Servo Motor is
(a) digital signal.
(b) analog signal.
(c) both digital and analog signal.
(d) none of the above.  

  6. A hysteresis motor is a type of
(a) asynchronous motor.
(b) synchronous motor.
(c) DC shunt motor.
(d) separately excited DC motor.  

  7. In a variable reluctance stepper motor, the rotor is made of
(a) paramagnetic material.
(b) dimagnetic material.
(c) ferromagnetic material.
(d) nonmagnetic material.  

 8. The stepper motor is used in
(a) computer printers.
(b) robotics.
(c) clocks.
(d) all of the above.  

 9. The hybrid stepper motor is designed to provide
(a) highest speed.
(b) better efficiency.
(c) constant speed.
(d) highest starting torque.  

 10. The stator of the hysteresis motor produce
(a) constant magnetic field.
(b) variable magnetic field.
(c) rotating magnetic field.
(d) none of the above.            

 11. The purpose of using shedding coils in a shaded pole motor is to
(a) reduce core losses.
(b) improve power factor.
(c) produce rotating magnetic field.
(d) provide magnetic locking.    

 12. Which of the following single phase motor has highest efficiency?
(a) Repulsion motor.
(b) Shaded pole motor.
(c) Split phase motor.
(d) Universal motor.  

 13. At synchronous speed, the torque developed by hysteresis motor is due to
(a) eddy current only.
(b) hysteresis loss only.
(c) both eddy current and hysteresis losses.
(d) none of the above.    

 14. In a repulsion induction motor, the starting torque is _______ the full load torque.
(a) less than
(b) equal to
(c) more than
(d) none of the above    

 15. In which of the following motors DC excitation is not required?
(a) hysteresis motor.
(b) reluctance motor.
(c) synchronous motor.
(d) none of the above.      

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