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


bconvection


cradiation


d any of the above


View Answer radiation

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


aGrey cast-iron


bCast steel


c High carbon steel


dStainless steel


View Answer Cast steel

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


asmall size


bmedium size


clarge size


dany of the above size


View Answer small size

Hot rolled sheets have ___________ value of permeability?


azero


blow


chigh


dnone of the above


View Answer low

Materials exhibiting zero value of resistivity are known as ____________ ?


aconductors


b semiconductors


cinsulators


d superconductors


View Answer superconductors

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


aSilver


bSteel


c Aluminium


dCopper


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


bAluminium


cSoft steel


dCast iron


View Answer Cast iron

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


a200 to 400 r.p.m


b600 to 1000 r.p.m


c1000 to 1500 r.p.m


d2000 to 2500 r.p.m


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


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


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


d All of the above


View Answer All of the above

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


aInduction


b Interaction


cAlignment


dAll of the above


View Answer All of the above

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