Electrical Engineering MCQs

Page No. 224

If two sine waves of the same frequency have a phase difference of JT radians, then_______?


aboth will reach their minimum values at the same instant


b both will reach their maximum values at the same instant


cwhen one wave reaches its maxi¬mum value, the other will reach its minimum value


dnone of the above



A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?


aaverage voltage


b r.m.s. voltage


c peak voltage


d none of the above


View Answer r.m.s. voltage

The voltage of domestic supply is 220V. This figure represents__________?


amean value


b r.m.s. value


c peak value


d average value


View Answer mean value

If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is____________?


a a sinusoid of the same frequency


b a sinusoid of half the original frequency


ca sinusoid of double the frequency


d not a sinusoid



The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_______ohms?


a 2.5


b 5


c10


d15


View Answer 10

The period of a wave is___________?


athe same as frequency


btime required to complete one cycle


cexpressed in amperes


d none of the above



The form factor is the ratio of_______?


apeak value to r.m.s. value


br.m.s. value to average value


caverage value to r.m.s. value


dnone of the above



A sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.


a100 n


b50 jt


c25 JT


d5 n


View Answer 100 n

The double energy transient occur in the____________?


apurely inductive circuit


b R-L circuit


cR-C circuit


dR-L-C circuit


View Answer R-L-C circuit

Power factor of the following circuit will be unity


ainductance


bcapacitance


cresistance


d both A. and B.


View Answer resistance

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