MCQs on Electrical Devices

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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.    

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

 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.   

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

 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.   

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

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