Electrical Engineering MCQs

Page No. 222

Power factor of the following circuit will be zero__________?


aresistance


binductance


ccapacitance


d both B. and C.


View Answer both B. and C.

Pure inductive circuit____________?


aconsumes some power on average


bdoes not take power at all from a line


ctakes power from the line during some part of the cycle and then returns back to it during other part of the cycle


d none of the above



Inductance of a coil Varies__________?


a directly as the cross-sectional area of magnetic core


b directly as square of number of turns


cdirectly as the permeability of the core


das A. to (d)


View Answer as A. to (d)

In a highly capacitive circuit the__________?


aapparent power is equal to the actual power


breactive power is more than the apparent power


c reactive power is more than the actual power


dactual power is more than its reactive power



Inductance affects the direct current flow__________?


aonly at the time of turning off


b only at the time of turning on


cat the time of turning on and off


dat all the time of operation



In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value__________?


a will change the maximum value of current at resonance


b will change the resonance frequency


cwill change the impedance at resonance frequency


dwill increase the selectivity of the circuit



Poor power factor________?


areduces load handling capability of electrical system


b results in more power losses in the electrical system


coverloads alternators, transformers and distribution lines


dresults in all above


View Answer results in all above

Time constant of an inductive circuit___________?


aincreases with increase of inductance and decrease of resistance


bincreases with the increase of inductance and the increase of resistance


c increases with decrease of inductance and decrease of resistance


dincreases with decrease of inductance and increase of resistance



Capacitive reactance is more when_______?


a capacitance is less and frequency of supply is less


b capacitance is less and frequency of supply is more


ccapacitance is more and frequency of supply is less


dcapacitance is more and frequency of supply is more



For a frequency of 200 Hz, the time period will be__________?


a0.05 s


b0.005 s


c 0.0005 s


d0.5 s


View Answer 0.005 s

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