Electrical Engineering MCQs

Page No. 216

Which of the following circuit component opposes the change in the circuit voltage ?


aInductance


bCapacitance


cConductance


d Resistance


View Answer Capacitance

Power factor of electric bulb is__________?


a zero


blagging


cleading


d unity


View Answer unity

Time constant of a circuit is the time in seconds taken after the application of voltage to each___________?


a25% of maximum value


b 50% of maximum value


c63% of maximum value


d90% of the maximum value


View Answer 63% of maximum value

The safest value of current the human body can carry for more than 3 second is_________?


a4 mA


b9 mA


c15 mA


d25 mA


View Answer 9 mA

If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?


a0.001 s


b 0.1 s


c10 s


d 100 s


View Answer 0.1 s

In a R-L-C circuit_________?


a power is consumed in resistance and is equal to I R


b exchange of power takes place between inductor and supply line


cexchange of power takes place between capacitor and supply line


dall above are correct


View Answer all above are correct

If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?


a42.42 sin 3141


b60 sin 25 t


c30 sin 50 t


d84.84 sin 25 t


View Answer 42.42 sin 3141

Which of the following coil will have large resonant frequency __________?


a A coil with large resistance


b A coil with low resistance


c A coil with large distributed capacitance


dA coil with low distributed capacitance



In an AC. circuit, a low value of kVAR compared with kW indicates_________?


alow efficiency


bhigh power factor


cunity power factor


d maximum load current


View Answer high power factor

The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?


a12 kW


b 22 kW


c32 kW


d64 kW


View Answer 32 kW

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