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A.C. Fundamentals, Circuits and Circuit Theory
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Power factor of electric bulb is__________?
Related MCQs
Time constant of a circuit is the time in seconds taken after the application of voltage to each__________?
The safest value of current the human body can carry for more than 3 second is_________?
If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?
In a R-L-C circuit_________?
If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?
Which of the following coil will have large resonant frequency __________?
In an AC. circuit, a low value of kVAR compared with kW indicates_________?
The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is__________?
A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of__________?
The ratio of active power to apparent power is known as factor__________?
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_________?
A parallel AC. circuit in resonance will__________?
In AC. circuits, laminated iron is invariably used in order to__________?
All definitions of power factor of a series R-L-C circuit are correct except__________?
The purpose of a parallel circuit resonance is to magnify________?
Wire-wound resistors are unsuitable for use at high frequencies because they_______?
Which of the following statements pertains to resistors only __________?
Aphasoris________?
Capacitive susceptance is a measure of__________?
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________ ?
In a parallel R-C circuit, the current always________the applied voltage?
Which of the following refers to a parallel circuit ?
In a sine wave the slope is constant_______?
In an A.C. circuit power is dissipated in__________?
Skin effect occurs when a conductor carries current at_______ frequencies
The power is measured in terms of decibles in case of_________?
At _______ frequencies the parallel R-L circuit behaves as purely resistive
At very low frequencies a series R-C circuit behaves as almost purely__________?
The frequency of domestic power supply in Pakistan is_________?
In a three-phase supply floating neutral is undesirable because it way give rise to__________?
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__________?
Which of the following waves has the highest value of peak factor __________?
The inductance of a coil can be increased by_________?
The phosphors for which of the following pair are 180° out of phase for VL, VC and VR______?
The r.m.s. value of pure cosine function is_________?
The series and parallel resonance on L-C circuit’ differs in that_________?
The frequency of an alternating current is__________?
Ohm is unit of all of the following except__________?
The equation of 50 Hz current sine wave having r.m.s. value of 60 A is__________?
The power factor of a D.C. circuit is always__________?
In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will__________?
In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?
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?
The product of apparent power and cosine of the phase angle between circuit voltage and current is
A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?
When an alternating current passes through an ohmic resistance the electrical power converted into heat is__________?
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 ______?
The power factor at resonance in R-L- C parallel circuit is________?
In a pure inductive circuit__________?
In the case of an unsymmetrical alternating current the average value must always be taken over__________?
Power factor of electric bulb is__________?
A. zero
B. lagging
C. leading
D. unity
Correct Answer:
unity
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Last Updated:
December 11, 2018