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

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bNucleate heating principle

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cResistance heating principle

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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

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bCore less furnace

✖


c Either of the above

✓


dNone of the above

✖



Induction heating takes place it which of the following ?


aInsulating materials

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bConducting materials which are magnetic

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cConducting materials which are non-magnetic

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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

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bBy varying the operating voltage

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cBy varying the current through heating elements

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dBy any of the above method

✓



In induction heating ___________ is abnormally high?


aphase angle

✖


bfrequency

✓


ccurrent

✖


dvoltage

✖


View Answer frequency

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