Electrical Engineering · Question Bank

1P AC Circuits

161 questions · page 7 of 9. Answer in your head first, then check the solution.

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TypeAll 161Problem solving 77Objective 84
DifficultyAll 161Easy 136Medium 22Hard 3
#121📘 EE Pocket Reviewer RojasEasy
Which of the following is not true about the characteristic of an ac wave?
AThe wave shape is identical for each cycle
BThe polarity reverses periodically
CThere is a definite frequency
DThe electrons always flow in the same direction
#122📘 EE Pocket Reviewer RojasEasy
An alternating voltage \(E_m\sin\theta\) is applied to a pure capacitive circuit. Which one is the current equation?
A\(I_m\sin\theta\)
B\(I_m\sin(\theta + \pi/4)\)
C\(I_m\sin(\theta - \pi/2)\)
D\(I_m\sin(\theta + \pi/2)\)
#123📘 EE Pocket Reviewer RojasEasy
For the same load, if the power factor of the load is reduced, which of the following will happen?
AIt will draw more current
BIt will draw less current
CIt will draw same current but less power
DIt will draw less current but more power
#124📘 EE Pocket Reviewer RojasEasy
Which of the following waves is the peakiest?
ASquare wave
BSinusoidal wave
CTriangular wave
DRectangular wave
#125📘 EE Pocket Reviewer RojasEasy
What is the reason why the power absorbed in a pure inductive circuit is zero?
APower factor of the circuit is zero
BReactive component of the current is zero
CReactance of the circuit is zero
DReactive and active components of the current are equal
#126📘 EE Pocket Reviewer RojasEasy
A wattless current is possible only in which type of loadings?
AResistive circuit
BNon-resistive circuit
CSeries RLC circuit
DParallel RLC circuit
#127📘 EE Pocket Reviewer RojasEasy
Which of the following defines a complex wave?
AIt is a nonsinusoidal wave by non-symmetrical
BIt is a wave who two half cycles are nonsymmetrical
CIt is a wave that contains real part and an imaginary part
DIt is a wave that contains its fundamental and its harmonics
#128📘 EE Pocket Reviewer RojasEasy
What will happen to the inductive reactance of a particular coil if the frequency of an ac wave gets lowered?
AIt will increase
BIt will decrease
CIt will remain the same
DNone of these
#129📘 EE Pocket Reviewer RojasEasy
What is the reason why voltages and currents are expressed in rms values?
AThey give comparison with dc
BIt is the standard by manufacturers
CThey are easily determined
DCalculations are easier and simpler
#130📘 EE Pocket Reviewer RojasEasy
What is the impedance of a series RLC circuit at resonance?
AZero
BEqual to 1
CMaximum
DMinimum
#131📘 EE Pocket Reviewer RojasEasy
For the same peak value of voltage, which of the following waves has the highest rms value?
ASine wave
BSquare wave
CTriangular wave
DFull-wave rectified wave
#132📘 EE Pocket Reviewer RojasEasy
The breakdown voltage of an insulation depends on which of the following values of the alternating voltage?
ARMS value
BPeak value
CAverage value
DInstantaneous value
#133📘 EE Pocket Reviewer RojasEasy
If the active and reactive powers in a circuit are equal, how much is the power factor of the circuit?
A1
B0.5
C0.707
D0.8
#134📘 EE Pocket Reviewer RojasEasy
Which statements is true regarding a series RLC circuit at resonance?
AThe circuit impedance is very large
BThe circuit power factor is minimum
CThe voltage across L or C is zero
DThe circuit power factor is unity
#135📘 EE Pocket Reviewer RojasEasy
What is the power factor of the circuit at resonance condition?
AZero
BOne
C0.5
D0.707
#136📘 EE Pocket Reviewer RojasEasy
What is the reason why the impedance of a parallel RLC circuit at resonance is very large?
AR is very large
BThe ratio of C/L is very large
CThe ratio of L/C is very large
DThe ratio of LC/R is very large
#137📘 EE Pocket Reviewer RojasEasy
How does the capacitive reactance of a circuit related to the frequency of the source voltage?
ADirectly proportional to frequency
BInversely proportional to frequency
CDirectly proportional to the square of frequency
DInversely proportional to the square of frequency
#138📘 EE Pocket Reviewer RojasEasy
What is the phase difference when two sinusoidal quantities are said to be phase quadrature?
A0
B30°
C45°
D90°
#139📘 EE Pocket Reviewer RojasEasy
In terms of resistance, reactance and impedance, which of the following ratios is equal to the power factor of the circuit?
AImpedance to reactance
BImpedance to resistance
CResistance to impedance
DReactance to resistance
#140📘 EE Pocket Reviewer RojasEasy
Non-sinusoidal waveforms are made up of which one?
ADifferent sinusoidal waveforms
BFundamental and even harmonics
CFundamental and odd harmonics
DEven and odd harmonics only

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