Electrical Engineering MCQs

Page No. 147

A non-dimensional number generally associated with natural convection heat transfer is____________?


aPrandtl number


b Grashoff number


cPecelet number


dNusselt number


View Answer Grashoff number

Induction heating process is based on which of the following principles ?


a Thermal ion release principle


bNucleate heating principle


cResistance heating principle


dElectro-magnetic induction princi¬ple



The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earth’s atmosphere is known as_______________?


aablation


bradiation


cviscous dissipation


d irradiation


View Answer ablation

In resistance heating highest working temperature is obtained from heating elements made of_____________?


anickel copper


b nichrome


csilicon carbide


dsilver


View Answer silicon carbide

For heating element high resistivity material is chosen to______________?


areduce the length of heating element


bincrease the life of the heating element


creduce the effect of oxidation


dproduce large amount of heat



In the indirect resistance heating method, maximum heat-transfer takes place by____________?


aradiation


bconvection


cconduction


dany of the above


View Answer radiation

For intermittent work which of the following furnaces is suitable ?


aIndirect arc furnace


bCore less furnace


c Either of the above


dNone of the above



Induction heating takes place it which of the following ?


aInsulating materials


bConducting materials which are magnetic


cConducting materials which are non-magnetic


dConducting materials which may or may not be magnetic



By which of the following methods the temperature inside arc nace can be varied ?


aBy disconnecting some of the heating elements


bBy varying the operating voltage


cBy varying the current through heating elements


dBy any of the above method



In induction heating ___________ is abnormally high?


aphase angle


bfrequency


ccurrent


dvoltage


View Answer frequency

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