Easy 1P AC Circuits Questions – Electrical Engineering (Page 6)

#101📘 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

#102📘 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

#103📘 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

#104📘 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

#105📘 EE Pocket Reviewer RojasEasy

What is the impedance of a series RLC circuit at resonance?

AZero

BEqual to 1

CMaximum

DMinimum

#106📘 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

#107📘 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

#108📘 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

#109📘 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

#110📘 EE Pocket Reviewer RojasEasy

What is the power factor of the circuit at resonance condition?

AZero

BOne

C0.5

D0.707

#111📘 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

#112📘 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

#113📘 EE Pocket Reviewer RojasEasy

What is the phase difference when two sinusoidal quantities are said to be phase quadrature?

A0

B30°

C45°

D90°

#114📘 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

#115📘 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

#116📘 EE Pocket Reviewer RojasEasy

In ac circuits, what do you call the ratio of real power to apparent power?

ADemand factor

BQuality factor

CPower factor

DSafety factor

#117📘 EE Pocket Reviewer RojasEasy

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

#118📘 EE Pocket Reviewer RojasEasy

Which one is the formula to solve the dynamic impedance of a parallel resonant circuit?

AL/CR

BRC

CRL/C

DL/R

#119📘 EE Pocket Reviewer RojasEasy

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

#120📘 EE Pocket Reviewer RojasEasy

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

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