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MCQs 1: Ohm is unit of all of the following except___________?

inductive reactance capacitive reactance resistance capacitance
Answer Explanation

MCQs 2: The frequency of an alternating current is____________?

the speed with which the alternator runs the number of cycles generated in one minute the number of waves passing through a point in one second the number of electrons passing through a point in one second
Answer Explanation

MCQs 3: The series and parallel resonance on L-C circuit’ differs in that_________?

series resistance needs a low-resistance source for sharp rise in current series resonance needs a high-resistance source for sharp increase in current parallel resonance needs a low-resistance source for a sharp in¬crease in impedance parallel resonance needs a low-resistance source for a sharp rise in line current
Answer Explanation

MCQs 4: The r.m.s. value of pure cosine function is_________?

0.5 of peak value 0.707 of peak value same as peak value zero
Answer Explanation

MCQs 5: The phosphors for which of the following pair are 180° out of phase for VL, VC and VR______?

Vc and VR VL and VR Vc and VL none of the above
Answer Explanation

MCQs 6: The inductance of a coil can be increased by_________?

increasing core length decreasing the number of turns decreasing the diameter of the former choosing core material having high relative permeability
Answer Explanation

MCQs 7: Which of the following waves has the highest value of peak factor ___________?

Square wave Sine wave Half wave rectified sine wave Triangular wave
Answer Explanation

MCQs 8: The r.m.s. value of half wave rectified sine wave is 200 V. The r.m.s. value of full wave rectified AC. will be___________?

282.8 V 141.4 V 111 V 100 V
Answer Explanation

MCQs 9: In a three-phase supply floating neutral is undesirable because it way give rise to___________?

high voltage across the load low voltage across the load unequal line voltages across the load minimun voltage across the load
Answer Explanation

MCQs 10: The frequency of domestic power supply in Pakistan is_________?

200 Hz 100 Hz 60 Hz 50 Hz
Answer Explanation

MCQs 11: At very low frequencies a series R-C circuit behaves as almost purely___________?

resistive inductive capacitive none of the above
Answer Explanation

MCQs 12: At _______ frequencies the parallel R-L circuit behaves as purely resistive

low very low high very high
Answer Explanation

MCQs 13: The power is measured in terms of decibles in case of_________?

electronic equipment transformers current transformers auto transformers
Answer Explanation

MCQs 14: Skin effect occurs when a conductor carries current at_______ frequencies

very low low medium high
Answer Explanation

MCQs 15: In an A.C. circuit power is dissipated in____________?

resistance only inductance only capacitance only none of the above
Answer Explanation

MCQs 16: In a sine wave the slope is constant_______?

between 0° and 90° between 90° and 180° between 180° and 270° no where
Answer Explanation

MCQs 17: Which of the following refers to a parallel circuit ?

The current through each element is same The voltage across element is in proportion to it’s resistance value The equivalent resistance is greater than any one of the resistors The current through any one element is less than the source current
Answer Explanation

MCQs 18: In a parallel R-C circuit, the current always________the applied voltage?

lags leads remains in phase with none of the above
Answer Explanation

MCQs 19: What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value________ ?

0° 45° 90° 180°
Answer Explanation

MCQs 20: Capacitive susceptance is a measure of__________?

reactive power in a circuit the extent of neutralisation of reactive power in a circuit a purely capacitive circuit’s ability to pass current a purely capacitive circuit’s ability to resist the flow of current
Answer Explanation

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