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MCQs on Induction

April 4, 2017 by admin

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 1. The starting torque of a single phase induction motor is
(a) low.
(b) zero.
(c) very high.
(d) unity.      

Answer

           B 

 2. The capacitor start capacitor run induction motor act as a true 2-phase motor at
(a) no load.
(b) full load.
(c) all load.
(d) starting.        

Answer

           B 

 3. Which of the following type of capacitor is generally used in capacitor start single phase induction motor?
(a) Paper capacitor.
(b) Mica capacitor.
(c) Ceramic capacitor.
(d) Electrolytic capacitor.      

Answer

           D 

 4. A resistance split phase induction motor is used for
(a) low inertia load.
(b) high inertia load.
(c) very high inertia load.
(d) none of the above.  

Answer

           A 

 5. In a capacitor start induction motor, the capacitor is connected in series with
(a) starting winding.
(b) running winding.
(c) main winding.
(d) compensating winding.  

Answer

           A 

 6. In a capacitor start induction motor, the value of capacitor is determined by its
(a) power factor.
(b) speed.
(c) starting torque.
(d) supply voltage.      

Answer

           C 

 7. The purpose of using starting winding in single phase induction motor is to
(a) improve voltage regulation.
(b) increase speed.
(c) developed starting torque.
(d) improve power factor.    

Answer

           C 

 8. In a three phase induction motor, the speed regulation at full load is about
(a) 0.4%.
(b) 4%.
(c) 10%.
(d) 18%.      

Answer

           B 

 9. The main purpose of using of using phase advancer with large induction motor is to
(a) devolved starting torque.
(b) control speed.
(c) improve voltage regulation.
(d) improve power factor. 

Answer

           D 

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

 10. If the supply voltage of a three phase induction motor decreases, then its
(a) torque decreases.
(b) speed decreases.
(c) rotor current increases.
(d) all of the above.        

Answer

           D 

 11. In three phase induction motor, the value of slip at standstill condition is equal to
(a) zero.
(b) 0.1.
(c) 0.5.
(d) one.    

Answer

           D 

 12. Which starting method cannot be used for starting 3 phase squirrel cage induction motor?
(a) Star-Delta.
(b) Rotor resistance.
(c) Line resistance.
(d) Auto transformer.    

Answer

           B 

 13. Circle diagram of an induction motor can be used determine its
(a) power factor.
(b) efficiency.
(c) slip.
(d) all of the above.        

Answer

           D 

 14. When a 50 Hz 3-phase induction motor is operating at 2% slip, the frequency of rotor current is
(a) 1 Hz
(b) 2 Hz
(c) 50 Hz
(d) 100 Hz    

Answer

           A 

 15. The stator core of a three phase induction motor is laminated in order to reduced the
(a) hysteresis losses.
(b) eddy current losses.
(c) copper losses.
(d) all of the above.    

Answer

           B 

 16. In an induction motor, the air gap flux density is usually kept low in order to
(a) Improve voltage regulation.
(b) reduce losses.
(c) improve speed regulation.
(d) improve power factor.  

Answer

           D 

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Also Read :

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