Electrical Engineering MCQs

Page No. 99

The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc?


aconduction

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bconvection

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cradiation

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d any of the above

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View Answer radiation

__________is extensively used for those portions of magnetic circuit which carry steady flux and need superior mechanical properties ?


aGrey cast-iron

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bCast steel

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c High carbon steel

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dStainless steel

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View Answer Cast steel

Aluminium when adopted as a conductor material in __________ transformers, decreases the overall cost of the transformer?


asmall size

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bmedium size

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clarge size

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dany of the above size

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View Answer small size

Hot rolled sheets have ___________ value of permeability?


azero

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blow

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chigh

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dnone of the above

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View Answer low

Materials exhibiting zero value of resistivity are known as ____________ ?


aconductors

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b semiconductors

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cinsulators

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d superconductors

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View Answer superconductors

_______________is universally used for windings of electrical machines because it is easily workable without any possibility of fracture?


aSilver

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bSteel

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c Aluminium

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dCopper

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View Answer Copper

__________ has a low relative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable?


aCast steel

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bAluminium

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cSoft steel

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dCast iron

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View Answer Cast iron

Commercial available medium size machines have a speed range of __________ ?


a200 to 400 r.p.m

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b600 to 1000 r.p.m

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c1000 to 1500 r.p.m

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d2000 to 2500 r.p.m

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View Answer 2000 to 2500 r.p.m

The change in flux linkages can be caused in which of the following ways ?


aThe flux is constant with respect to time and is stationary and the coil moves through it

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bThe coil is stationary with respect to flux and the flux varies in magnitude with respect to time

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cBoth the changes mentioned above occur together, i.e., the coil moves through a time varying field

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d All of the above

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View Answer All of the above

The action of electromagnetic machines can be related to which of the following basic principles __________?


aInduction

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b Interaction

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cAlignment

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dAll of the above

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View Answer All of the above

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