Electrical Engineering MCQs

Page No. 146

In a domestic cake baking oven the temperature is controlled by________________?


a voltage variation


bthermostat


cauto-transformer


dseries-parallel operation



Due to which of the following reasons it is desirable to have short arc length ?


aTo achieve better heating


bTo increase the life of roof refractory


cTo have better stirring action


dAll of the above


View Answer All of the above

In an electric press mica is used_____________?


aas an insulator


bas a device for power factor improvement


c for dielectric heating


d for induction heating


View Answer as an insulator

By the use of which of the following, high frequency power supply for induction furnaces can be obtained ?


aCoreless transformers


bCurrent transformers


cMotor-generator set


dMulti-phase transformer


View Answer Motor-generator set

The temperature inside a furnace is usually measured by which of the following ?


aOptical pyrometer


bMercury thermometer


cAlcohol thermometer


dAny of the above


View Answer Optical pyrometer

Which of the following insulating materials was suitable for low temperature applications ?


aAsbestos paper


bDiatomaceous earth


c80 percent magnesia


dCork


View Answer Diatomaceous earth

The material of the heating element for a furnace should have___________?


alower melting point


b higher temperature coefficient


chigh specific resistance


dall of the above



In an electric room heat convector the method of heating used is______________?


aarc heating


b resistance heating


cinduction heating


ddielectric heating


View Answer resistance heating

Induction furnaces are employed for which of the following ?


aHeat treatment of castings


b Heating of insulators


c Melting aluminium


dNone of the above



Which of the following will happen if the thickness of refractory wall of furnace is increased ?


aHeat loss through furnace wall will increase


bTemperature inside the furnace will fall


cTemperature on the outer surface of furnace walls will drop


dEnergy consumption will increase



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