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MCQs on Electrical Devices

May 4, 2017 by admin

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 1. Which of the following gas is mainly used inside a electric bulb?
(a) Carbon dioxide gas.
(b) Hydrogen gas.
(c) Inert gas.
(d) Helium gas.    

Answer

           C 

 2. Which part of microwave oven  generate micro waves?
(a) Generator.
(b) Magnetron.
(c) Metal mesh.
(d) Booste.r  

Answer

           B 

 3. In microwave oven, the micro waves have a special property that they are absorb by
(a) water.
(b) fats.
(c) sugar.
(d) all of the above.   

Answer

           D 

 4. When the door of a refrigerator is kept open, the temperature of room will
(a) increase.
(b)decrease.
(c) remain same.
(d) none of the above.  

Answer

           A 

 5. Which of the following lamp cannot sustain much voltage fluctuations?
(a) Incandescent lamp.
(b) Sodium vapour lamp.
(c) Mercury vapour lamp.
(d) Fluorescent lamp.   

Answer

           A 

 6. A current source inverter is generally employed if source inductance is
(a) small.
(b) large.
(c) zero.
(d) none of the above.   

Answer

           B 

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