Electrical Engineering · Question Bank

circuits

301 questions · page 3 of 16. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
#41
Vl = Vc in a series RLC circuit when
Athe value of the impedance is minimum
Bthe power factor is zero
Cthe current leads the total voltage by 90 degrees
Dthe total voltage is zero
#42
Property of an electric circuit that dissipates electric energy.
Areactance
Bimpedance
Cresistance
Dconductance
#43
What is the other name of relative permittivity?
Adielectric strength
Bpotential gradient
Cbreakdown voltage
Dspecific inductive capacity
#44
In a series RLC circuit
Athe current lags Vl by 90 degrees
Bthe current leads Vl by 90 degrees
CXl leads Xc by 90 degrees
DZ = jXl at resonance
#45
Resistor with color bands in the body.
Awire-wound resistor
Bcarbon-composition resistor
Cpotentiometer
Drheostat
#46
In a resonant circuit, if Q is >= 10, resonant frequency _____ bandwidth.
Abisects
Bexceeds
Cis less than
Dis equal to
#47
Which of the following conditions is not true for a series RLC circuit at resonance?
AZ=jXl
BXl=Xc
Cthe power factor is one
Dthe magnitude of Z is sqrt [ R^2 + ( Xl - Xc )^2 ]
#48
The current is _____ times the maximum current at half-power points of a resonance curve.
A0.707
B1.414
C0.5
D0.632
#49
A gang capacitor is a variable capacitor in which capacitance is varied by changing the
Adielectric
Bnumber of plates
Cplate area
Ddistance between plates
#50
In an ac circuit with inductive reactance, the
Aphase angle of the circuit is always 45 degrees
Bvoltage across the inductance must be 90 degrees out of phase with the applied voltage
Ccurrent through the inductance lags its induced voltage by 90 degrees
Dcurrent through the inductance and voltage across it are 180 degrees out-of-phase
#51
In a series RLC circuit
Aincreasing the frequency decreases the resistance
Bincreasing the frequency increases the resistance
Cboth Xl and Xc changes as frequency changes
Dimpedance will always decrease
#52
A series RLC circuit has a _____ power factor at its half-power points.
Aunity
Bleading
Clagging
Deither B or C
#53
Kirchoff's laws (KCL and KVL) are applicable to
Adc circuits alone
Bac circuits alone
Cdc as well as ac circuits
Dpassive networks alone
#54
A capacitive load always has a _____ power factor.
Aleading
Blagging
Cfactor
Dunity
#55
What is the temperature coefficient of resistance of Eureka?
Ainfinity
Bnegative
Calmost zero
Dpositive
#56
As applied to a series RLC circuit, bandwidth means
Athe frequency range for maximum power transfer
Bthe difference between the highest and lowest frequencies of the oscillator
Cthe separation of the half-power points
Dthe frequency at which Xl=Xc
#57
What is considered the effect of dielectric material?
Aincreasing capacitance
Bdecreasing capacitance
Creducing the work voltage
Dincreasing the distance between the plates
#58
If resonant frequency is 10 kHz and quality factor is 50, then
Abandwidth is 200 Hz
BXl is 50000 ohms
CR is 50 ohms
DXc is 50000 ohms
#59
Which statement is true?
AA series resonant circuit is of high impedance
BA parallel resonant circuit is of low impedance
CA series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency
DA parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency
#60
What is considered as the most important value of a sine wave?
Aeffective value
Bpeak value
Caverage value
Dinstantaneous value

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