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MCQs 1: Aphasoris________?

a line which represents the magnitude and phase of an alternating quantity a line representing the magnitude and direction of an alternating quantity a coloured tag or band for distinction between different phases of a 3-phase supply an instrument used for measuring phases of an unbalanced 3-phase load
Answer Explanation

MCQs 2: Which of the following statements pertains to resistors only _____________?

can dissipate considerable amount of power can act as energy storage devices connecting them in parallel in¬creases the total value oppose sudden changes in voltage
Answer Explanation

MCQs 3: Wire-wound resistors are unsuitable for use at high frequencies because they_______?

create more electrical noise are likely to melt under excessive eddy current heat consume more power exhibit unwanted inductive and capacitive effects
Answer Explanation

MCQs 4: The purpose of a parallel circuit resonance is to magnify________?

current voltage power frequency
Answer Explanation

MCQs 5: All definitions of power factor of a series R-L-C circuit are correct except__________?

ratio of net reactance and impedance ratio of kW and kVA ratio of J and Z ratio of W and VA
Answer Explanation

MCQs 6: In AC. circuits, laminated iron is invariably used in order to__________?

reduce eddy current loss increase heat radiation make assembly cheap and easier reduce circuit permeability
Answer Explanation

MCQs 7: A parallel AC. circuit in resonance will__________?

have a high voltage developed across each inductive and capacitive section have a high impedance act like a resistor of low value have current in each section equal to the line current
Answer Explanation

MCQs 8: The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is_________?

4 kVAR 6 kVAR 8 kVAR 16 kVAR
Answer Explanation

MCQs 9: The ratio of active power to apparent power is known as factor__________?

demand load power form
Answer Explanation

MCQs 10: The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?

iron loss in core skin effect increase in temperature capacitive effect between adjacent coil turns
Answer Explanation

MCQs 11: A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?

the big size of the inductor the reactance of the inductor the current flowing in the inductor the statement given is false
Answer Explanation

MCQs 12: The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?

12 kW 22 kW 32 kW 64 kW
Answer Explanation

MCQs 13: In an AC. circuit, a low value of kVAR compared with kW indicates_________?

low efficiency high power factor unity power factor maximum load current
Answer Explanation

MCQs 14: Which of the following coil will have large resonant frequency __________?

A coil with large resistance A coil with low resistance A coil with large distributed capacitance A coil with low distributed capacitance
Answer Explanation

MCQs 15: If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?

42.42 sin 3141 60 sin 25 t 30 sin 50 t 84.84 sin 25 t
Answer Explanation

MCQs 16: In a R-L-C circuit_________?

power is consumed in resistance and is equal to I R exchange of power takes place between inductor and supply line exchange of power takes place between capacitor and supply line exchange of power does not take place between resistance and the supply line all above are correct
Answer Explanation

MCQs 17: If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?

0.001 s 0.1 s 10 s 100 s
Answer Explanation

MCQs 18: The safest value of current the human body can carry for more than 3 second is_________?

4 mA 9 mA 15 mA 25 mA
Answer Explanation

MCQs 19: Time constant of a circuit is the time in seconds taken after the application of voltage to each___________?

25% of maximum value 50% of maximum value 63% of maximum value 90% of the maximum value
Answer Explanation

MCQs 20: Power factor of electric bulb is__________?

zero lagging leading unity
Answer Explanation

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