Electrical Engineering · Question Bank

1P AC Circuits

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#81📜 EE Pre-Board August 2018📘 PowerhouseEasy
At very low frequencies a series RC circuit behaves as almost purely
Aresistive
Binductive
Ccapacitive
Dnone of these
#82📜 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
#83📜 EE Pre-Board August 2018📘 PowerhouseEasy
A voltage of 10 V is applied to a series RLC circuit. If the Q of the coil at the resonant frequency is 20, the voltage across the inductor at the resonant frequency will be
A200 v
B100 v
C75 v
D50 v
#84📜 EE Pre-Board August 2018📘 PowerhouseEasy
A half wave rectified sine wave has an average value of 100 amperes. What is its effective value?
A157 A
B70.71 A
C100 A
D141.4 A
#85📘 EE Pocket Reviewer RojasEasy
Which one is magnified in a parallel resonant circuit?
ACurrent
BVoltage
CImpedance
DAll of these
#86📘 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
#87📘 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
#88📘 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
#89📘 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
#90📘 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
#91📘 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
#92📘 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
#93📘 EE Pocket Reviewer RojasEasy
What is the form factor of a sinusoidal wave?
A1.11
B1.5
C1.414
D2
#94📘 EE Pocket Reviewer RojasEasy
Which one defines an admittance?
AIt is the reciprocal of resistance
BIt is the reciprocal of reactance
CIt is a measure of the opposition a circuit offers to ac
DIt is a measure of the ease with which a circuit passes ac
#95📘 EE Pocket Reviewer RojasEasy
One of the following is a reason why power factor must be corrected. Which one?
ATo reduce the reactive power
BTo increase the real power
CTo increase the reactive power
DTo reduce the real power
#96📘 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
#97📘 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\(I_m\sin(\theta + \pi/2)\)
#98📘 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
#99📘 EE Pocket Reviewer RojasEasy
Which of the following waves is the peakiest?
ASquare wave
BSinusoidal wave
CTriangular wave
DRectangular wave
#100📘 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

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