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MCQs 1: The period of a sine wave is _____ seconds. Its frequency is

20 Hz 30 Hz 40 Hz 50 Hz
Answer Explanation

MCQs 2: The peak value of a sine wave is 200 V. Its average value is___________?

127.4 V 141.4 V 282.8 V 200V
Answer Explanation

MCQs 3: The power consumed in a circuit element will be least when the phase difference between the current and voltage is__________?

180″ 90° 60° 0°
Answer Explanation

MCQs 4: For the same peak value which of the following wave will ‘have the highest r.m.s. value?

square wave half wave rectified sine wave triangular wave sine wave
Answer Explanation

MCQs 5: The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

both waves must have same frequency both waves must have identical peak values both waves must have zero value at the same time none of the above
Answer Explanation

MCQs 6: In a series resonant circuit, the impedance of the circuit is___________?

minimum maximum zero none of the above
Answer Explanation

MCQs 7: Power factor of an electrical circuit is equal to____________?

R/Z cosine of phase angle difference be-tween current and voltage kW/kVA ratio of useful current to total cur¬rent Iw/I all of these
Answer Explanation

MCQs 8: The best place to install a capacitor is___________?

very near to inductive load across the terminals of the inductive load far away from the inductive load any where
Answer Explanation

MCQs 9: All the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?

capacitance only inductance only resistance only all above
Answer Explanation

MCQs 10: Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?

parallel series either A. or (b) none of the above
Answer Explanation

MCQs 11: Power factor of the following circuit will be unity

inductance capacitance resistance both A. and B.
Answer Explanation

MCQs 12: The double energy transient occur in the____________?

purely inductive circuit R-L circuit R-C circuit R-L-C circuit
Answer Explanation

MCQs 13: A sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.

100 n 50 jt 25 JT 5 n
Answer Explanation

MCQs 14: The form factor is the ratio of_______?

peak value to r.m.s. value r.m.s. value to average value average value to r.m.s. value none of the above
Answer Explanation

MCQs 15: The period of a wave is___________?

the same as frequency time required to complete one cycle expressed in amperes none of the above
Answer Explanation

MCQs 16: 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?

2.5 5 10 15
Answer Explanation

MCQs 17: If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is____________?

a sinusoid of the same frequency a sinusoid of half the original frequency a sinusoid of double the frequency not a sinusoid
Answer Explanation

MCQs 18: The voltage of domestic supply is 220V. This figure represents__________?

mean value r.m.s. value peak value average value
Answer Explanation

MCQs 19: A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?

average voltage r.m.s. voltage peak voltage none of the above
Answer Explanation

MCQs 20: If two sine waves of the same frequency have a phase difference of JT radians, then_______?

both will reach their minimum values at the same instant both will reach their maximum values at the same instant when one wave reaches its maxi¬mum value, the other will reach its minimum value none of the above
Answer Explanation

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