Electrical Engineering MCQs

Page No. 167

What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?


a22 x 10″8 N


b22 x 10″7 N


c22 x 10-6 N


d22 x 10″5 N


View Answer 22 x 10″5 N

The unit of flux is the same as that of_______________?


areluctance


bresistance


cpermeance


d pole strength


View Answer pole strength

The commonly used material for shielding or screening magnetism is____________?


acopper


baluminium


c soft iron


d brass


View Answer soft iron

The Biot-savart’s law is a general modification of_______________?


aKirchhoffs law


bLenz’s law


cAmpere’s law


d Faraday’s laws


View Answer Ampere’s law

If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?


aless than that of disc but in opposite direction


b equal to that of disc and in the same direction


cequal to that of disc and in the opposite direction


d less than that of disc and in the same direction



What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ?


a2


b 4


c 6


d8


View Answer 4

The materials are a bit inferior conductors of magnetic flux than air


aferromagnetic


b paramagnetic


cdiamagnetic


ddielectric


View Answer diamagnetic

he retentivity (a property) of material is useful for the construction of__________?


a permanent magnets


b transformers


cnon-magnetic substances


d electromagnets


View Answer permanent magnets

he retentivity (a property) of material is useful for the construction of_______________?


apermanent magnets


b transformers


cnon-magnetic substances


delectromagnets


View Answer permanent magnets

A permanent magnet______________?


aattracts some substances and repels others


b attracts all paramagnetic substances and repels others


cattracts only ferromagnetic substances


d attracts ferromagnetic substances and repels all others



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