Electrical Engineering MCQs

Page No. 6

The only difference between construction of D.C generator and A.C generator is that of_______________?


acarbon brushes


bcoil


c commutator


dmagnetic field


View Answer commutator

If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?


aVs/Vp = Np/Ns


bVs/Vp = Ns/Np


c Vp/Vs = Ns/Np


dVp/Vs = Np/Ns


View Answer Vs/Vp = Ns/Np

A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?


a0 volt


b3.125 volt


c31.25 volt


d0.03125 volt


View Answer 0.03125 volt

The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core_______________?


a Decreases the resistance of the solenoid


bReduces the effect of eddy current


cImproves the flux linkage between the turns of the coil


dIncreases the mutual inductance between the solenoid and the core



An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?


a150msec-1


b384msec-1


c 38.4msec-1


d200msec-1


View Answer 384msec-1

Non inductive resistances are used in decreasing______________?


a Mutual inductance


bSelf inductance


cMagnetic fields


dHeating effect


View Answer Self inductance

Which one of the following devices does not function like an electric motor ?


aGalvanometer


bAmmeter


cVoltmeter


dTransformer


View Answer Transformer

For long distance transmission the transformer used is_____________?


aStep down


b Input voltage and output voltage remain same


cStep up


d Amplifier is used


View Answer Step up

Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic_____________?


aRetaintivity


bPermeability


c Flux


dHysteresis


View Answer Hysteresis

When the motor is at its maximum speed then back emf will be______________?


aMaximum


bZero


cIntermediate values


dD. No back emf


View Answer Maximum

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