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MCQs on Electrical Devices

May 4, 2017 by admin

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 1. Which of the following refrigerant is widely used in domestic refrigeration?
(a) oxygen.
(b) ammonia.
(c) neon.
(d) alcohol.    

Answer

           B 

 2. In a refrigerator, the lowest temperature occur at
(a) condenser.
(b) compressor.
(c) evaporator.
(d) expansion valve.   

Answer

           C 

 3. In a electric iron, the transfer of heat from coil to base plate is mainly through
(a) conduction.
(b) convection.
(c) radiation.
(d) none of the above.   

Answer

           A 

  4. The heating element in an electric iron is usually made of
(a) brass.
(b) iron.
(c) nichrome.
(d) platinum.   

Answer

           C 

 5. The heating element in an electric heater is made of
(a) aluminium.
(b) nichrome.
(c) tungsten.
(d) platinum.  

Answer

           B 

 6. Which of the following material is used to made heating element of electric toaster?
(a) Tungsten.
(b) Platinum.
(c) Iron.
(d) Nichrome.  

Answer

           D 

 7. The heating element in an electric iron is wound around a sheet of
(a) mica.
(b) cardboard.
(c) cotton.
(d) porcelain.   

Answer

           A 

 8. The rating all electric iron is expressed in
(a) watt.
(b) kVA.
(c) kWh.
(d) HP.   

Answer

           A 

 9. The capacity an air conditioner is expressed in
(a) watt.
(b) HP.
(c) kWh.
(d) tons. 

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. The capacity of a domestic refrigerator is expressed in
(a) watt.
(b) HP.
(c) watt-hours.
(d) tons.   

Answer

           D 

 11. Which of the following heating method is generally used in electric iron?
(a) Direct resistance heating.
(b) Indirect resistance heating.
(c) Dielectric heating.
(d) Arc heating.  

Answer

           A 

 12. Which part of washing machine actually perform the cleaning operation of cloth clothes?
(a) Drain.
(b) Tub.
(c) Agitator.
(d) Timer.    

Answer

           C 

 13. Which type of magnet is used in an electric bell?
(a) Temporary magnet.
(b) Permanent magnet.
(c) Electromagnet.
(d) Carbon magnet.   

Answer

           C 

 14. Which of the following device is responsible for production of the cold liquid in a refrigerator?
(a) Compressor.
(b) Condenser.
(c) Evaporator.
(d) Throtting device.  

Answer

           D 

 15. In refrigerator, at the inlet of capillary the refrigerant should be
(a) low pressure liquid.
(b) higher pressure liquid.
(c) low temperature liquid.
(d) high temperature liquid.  

Answer

           B 

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