Electrical Engineering MCQs

Page No. 225

Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?


aparallel

✓


bseries

✖


c either A. or (b)

✖


d none of the above

✖


View Answer parallel

All the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?


a capacitance only

✖


binductance only

✖


cresistance only

✓


dall above

✖


View Answer resistance only

The best place to install a capacitor is___________?


avery near to inductive load

✖


bacross the terminals of the inductive load

✓


cfar away from the inductive load

✖


dany where

✖



Power factor of an electrical circuit is equal to____________?


aR/Z

✖


bcosine of phase angle difference be-tween current and voltage

✖


ckW/kVA

✖


dall of these

✓


View Answer all of these

In a series resonant circuit, the impedance of the circuit is___________?


aminimum

✓


bmaximum

✖


c zero

✖


dnone of the above

✖


View Answer minimum

The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that


a both waves must have same frequency

✓


bboth waves must have identical peak values

✖


cboth waves must have zero value at the same time

✖


dnone of the above

✖



For the same peak value which of the following wave will ‘have the highest r.m.s. value?


asquare wave

✓


b half wave rectified sine wave

✖


c triangular wave

✖


dsine wave

✖


View Answer square wave

The peak value of a sine wave is 200 V. Its average value is___________?


a127.4 V

✖


b 141.4 V

✓


c282.8 V

✖


d 200V

✖


View Answer 141.4 V

The period of a sine wave is _____ seconds. Its frequency is


a 20 Hz

✖


b 30 Hz

✖


c40 Hz

✖


d50 Hz

✓


View Answer 50 Hz

The knowledge of diversity factor helps in determining__________?


aplant capacity

✓


baverage load

✖


cpeak load

✖


d kWh generated

✖


View Answer plant capacity

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