Electrical Engineering · Question Bank

1P AC Circuits

84 of 161 questions match · page 2 of 5. Answer in your head first, then check the solution.

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#21📜 EE Pre-Board August 2017📘 PowerhouseEasy
For which of the following waveforms are the rms value and the mean value the same?
ASine wave
BTriangular wave
CSquare wave
DHalf-wave rectified sine wave
#22📜 EE Pre-Board March 2018📘 PowerhouseEasy
What is considered as the most important value of a sine wave?
AEffective value
BPeak value
CAverage value
DInstantaneous value
#23📜 EE Pre-Board March 2018📘 PowerhouseEasy
A capacitive load always has a __________ power factor
ALeading
BLagging
CZero
DUnity
#24📜 EE Pre-Board March 2018📘 PowerhouseEasy
The rms value of a sinusoidal wave is equal to _________ of maximum value.
A0.637
B0.707
C0.506
D1.414
#25📜 EE Pre-Board March 2018📘 PowerhouseEasy
The ratio of active power to apparent power is known as _______________ factor.
Ademand
Bload
Cpower
Dform
#26📜 EE Pre-Board March 2018📘 PowerhouseEasy
At ________________ frequencies, the parallel R-L circuit behaves as purely resistive.
Avery low
Blow
Chigh
Dvery high
#27📜 EE Pre-Board March 2018📘 PowerhouseEasy
In a circuit containing R, L, and C, power loss can take place in
AC only
BL only
CR only
Dall of these
#28📜 EE Pre-Board March 2018📘 PowerhouseEasy
The form factor is the ratio of
Apeak value to r.m.s value
Br.m.s value to average value
Caverage value to r.m.s value
Dnone of these
#29📜 EE Pre-Board March 2018📘 PowerhouseEasy
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
Aa sinusoidal of the same frequency
Ba sinusoidal of half the original frequency
Ca sinusoidal of double the freq
Dnot a sinusoid
#30📜 EE Pre-Board August 2018📘 PowerhouseEasy
The current flowing in L and C at parallel resonance are
Azero
Bequal
Cinfinite
DDifference
#31📜 EE Pre-Board August 2018📘 PowerhouseEasy
At very low frequencies a series RC circuit behaves as almost purely
Aresistive
Binductive
Ccapacitive
Dnone of these
#32📜 EE Pre-Board August 2018📘 PowerhouseEasy
The rms value of pure cosine function is
A0.5 of peak value
B0.707 of peak value
Csame as peak value
Dzero
#33📘 EE Pocket Reviewer RojasEasy
Which one is magnified in a parallel resonant circuit?
ACurrent
BVoltage
CImpedance
DAll of these
#34📘 EE Pocket Reviewer RojasEasy
Which one is true regarding an inductive susceptance?
AIt is the reciprocal of inductance
BIt is the reciprocal of capacitive susceptance
CIt is a negative imaginary
DIt is a positive imaginary
#35📘 EE Pocket Reviewer RojasEasy
Which of the following statements is correct about the currents in RLC circuit at resonance?
ACurrent is minimum in series circuit while maximum in parallel circuit
BCurrent is maximum in series circuit while minimum in parallel circuit
CCurrents on both circuits are maximum
DCurrents on both circuits are minimum
#36📘 EE Pocket Reviewer RojasEasy
The following are effects of having a low power factor EXCEPT one. Which one?
AReduction in power losses
BAlternators are overloaded
CReduction in load handling capacity of an electrical system
DLarge voltage drop in the transmission lines
#37📘 EE Pocket Reviewer RojasEasy
Which of the following defines a “phasor”?
AA line that represents the magnitude and direction of an alternating quantity
BA line that represents the magnitude and phase of an alternating quantity
CA line representing the reference horizontal and vertical axis
DA line representing phase values of an alternating quantity
#38📘 EE Pocket Reviewer RojasEasy
Which of the following waves has a form factor equal to 1.
ASinusoidal wave
BSquare wave
CSaw tooth wave
DTriangular wave
#39📘 EE Pocket Reviewer RojasEasy
In a pure resistance ac circuit, what is the frequency of the power curve in comparison to the frequency of the source voltage?
AEqual
BTwice as much
CThree times as much
DHalf as much
#40📘 EE Pocket Reviewer RojasEasy
Which of the following waves have the same rms and mean values?
ASine wave
BSquare wave
CHalf-wave rectified wave
DFull-wave rectified wave

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