What is the phase difference when two sinusoidal quantities are said to be phase quadrature?
A0
B30°
C45°
D90°
Electrical Engineering · Question Bank
1P AC Circuits
84 of 161 questions match · page 4 of 5. Answer in your head first, then check the solution.
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
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
In ac circuits, what do you call the ratio of real power to apparent power?
ADemand factor
BQuality factor
CPower factor
DSafety factor
What will happen to the circuit current if the admittance of a parallel circuit is increased?
AIt will decrease
BIt will increase
CIt will not be affected
DNone of these
Which one is the formula to solve the dynamic impedance of a parallel resonant circuit?
AL/CR
BRC
CRL/C
DL/R
If the circuit power factor is unity, what is the value of its reactive power?
AIts reactive power is equal to its active power
BIts reactive power is negative
CIts reactive power is positive
DIts reactive power is zero
What is the reason why ac system is preferred over dc system?
AAC voltage can easily be changed in magnitude
BAC motors are more efficient than DC motors
CAppliances are run only on AC voltage
DAC systems is already used since the early days
What is the peak factor of a half-wave rectified ac wave?
A1.57
B1.11
C1.414
D2
All of the following of power factor of a series RLC circuit are correct EXCEPT one. Which one?
ARatio of resistance and impedance
BRatio of watts and volt-amperes
CRatio of net reactance and impedance
DRatio of kilowatts and kilovolt-amperes
How does the voltage in a pure capacitor related to its current when supplied with an ac source?
AThe voltage leads the current by 90°
BThe voltage lags the current by 90°
CThe voltage leads the current between 0° to 90°
DThe voltage lags the current between 0° to 90°
What is the behavior of an RLC circuit if the frequency is less than the resonant frequency?
ASeries circuit is capacitive while parallel circuit is inductive
BSeries circuit is inductive while parallel circuit is capacitive
CBoth circuits are capacitive
DBoth circuits are inductive
The value of the current in a series resonance circuit is affected by which of the following circuit parameters?
AResistance
BInductance
CCapacitance
DAll of these
Which one is magnified in a series resonant circuit?
AVoltage
BCurrent
CImpedance
DAll of these
What is the peak factor of a sine wave?
A1.11
B0.707
C1.414
D1.57
Which of the following is true about the power drawn by a pure reactance?
AIt is a true power
BIt is a radiated power
CIt is an apparent power
DIt is an imaginary power
How does the inductive 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
What are the currents flowing in L and C during parallel resonance?
AThey are both zero
BThey are equal in magnitudes and in-phase
CThey are equal in magnitudes and out of phase by 90°
DThey are equal in magnitudes and out of phase by 180°
What is the circuit behavior of a series RLC circuit above the self resonant frequency?
AInductive
BCapacitive
CResistive
DEither A or B, depending on the value of R
Power factor is defined as the ratio of which of the following?
AVolt-ampere to watt
BWatts to reactive volt-ampere
CVolt-ampere reactive to volt-ampere
DWatt to volt-ampere
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