Electrical Engineering MCQs

Page No. 220

Ohm is unit of all of the following except___________?


a inductive reactance


b capacitive reactance


cresistance


d capacitance


View Answer capacitance

The equation of 50 Hz current sine wave having r.m.s. value of 60 A is____________?


a60 sin 25 t


b60 sin 50 t


c84.84 sin 3141


d42.42 sin 314 t


View Answer 84.84 sin 3141

The power factor of a D.C. circuit is always__________?


aless than unity


b unity


cgreater than unity


d zero


View Answer unity

In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?


abe reduced by half


bbe doubled


cbe four times as high


dbe reduced to one fourth


View Answer be doubled

An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?


a the current through the resistance is more


b the current through the resistance is less


c both resistance and inductance carry equal currents


d none of the above



The product of apparent power and cosine of the phase angle between circuit voltage and current is


a true power


breactive power


cvolt-amperes


dinstantaneous power


View Answer true power

A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?


a the capacitive reactance in ohms


bthe current flowing in capacitor


cthe size of the capacitor being quite big


d the statement is incorrect



When an alternating current passes through an ohmic resistance the electrical power converted into heat is__________?


aapparent power


b true power


creactive power


dnone of the above


View Answer true power

In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters ______?


a220 V


b220V3V


c 220/V3 V


dnone of the above


View Answer 220 V

The power factor at resonance in R-L- C parallel circuit is________?


azero


b0.08 lagging


c0.8 leading


d unity


View Answer unity

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