# DMRC JE/SSC JE/CIL MT ELECTRICAL ENGINEERING IMPORTANT MCQ PART 2(BASIC ELECTRICAL)

41. What is the half-power bandwidth of a parallel resonant
circuit which has a resonant frequency of 3.6 MHz and Q of 218?

A. 16.5 kHz
B.
1.65 kHz
C.
16.5 MHz
D.
165 kHz
42. Which one of the following elements serves as a protection

A.
Fuse
B.
Switch
C.
Resistor
D.
Relay
43. Transient period is considered over after
A. 5 TAA
B.
1 Taa
C.
100 Taa
D.
6 Taa
44. What rating of a resistor determines its ability to absorb
heat?

A.
Wattage
B.
Ohmic
C.
Current
D.
Voltage
45. An open inductor has:
A.
Zero resistance and infinite inductance
B.
Infinite resistance and infinite inductance
C. Infinite resistance and zero inductance
D.
Zero resistance and zero inductance
46.
What is the reading of an ohmmeter for a shorted capacitor?
B. Zero
C.
Infinity
D.
k Ohm
E.
M Ohm
47.
What capacitance exists not through design but simply because two conducting
surfaces are relatively close to each other?

A.
Surge
B.Stray
C.
Natural
D.
Normal
48. The average value of a triangular or sawtooth wave is_______
times its peak value.

A.
0.577
B. 0.500
C.
0.318
D.
0.637
49.
A series RLC circuit consists of a 10 Ohm resistor in series with L = 10 µH,
and C = 100 µF. Determine a new value of I, for which the resonant frequency is
one —half the original value.
A.
40uH
B.
40 mH
C.
40 pH
D.
40 nH
50. What is the peak factor of a triangular wave?
A.
1.16
B. 1.73
C.
1.41
D.
1.11
51. Effects of capacitance:
A.
It opposes any change in the amount of voltage
B.
Voltage is lagged behind the current by a quarter cycle
C.
Electric energy is stored in the capacitor in the form of electrostatic field
D. All of the above
52. Points to be considered in choosing a capacitor
A.
Working voltage
B.
Type of dielectric
C.
Capacitance
D. All of the above
53.
Permeability is otherwise known as
A.
Magnetic conductivity
B.
Magnetic susceptibility
C.
Electric conductivity
D.
Electric susceptibility
54. The impedance in the study of electronics is represented by
resistance and

A. Reactance
B.
Inductance
C.
Capacitance
D.
Inductance and capacitance
55. Loop currents should be assumed to flow in which direction
A.
Straight
B.
Clockwise
C.
Counter-clockwise
D. Either B or C arbitrarily
56. What determines the direction of induced emf in a conductor
or coil?

A.
Corkscrew rule
B.
Fleming’s left hand rule
C. Fleming’s right hand rule
D.
Ampere’s circuital law
57.
The reason why electrical appliances are connected in parallel.
A.
It is a simple circuit
B. This makes the operation of appliances independent of each other
C.
This results in reduced power consumption
D.
All of the above
58.
Which of the following does not affect resistance?
A. Mass
B.
Resistivity
C.
Cross-sectional area
D.
Length
59. Which of the following is not considered a physical factor
affecting resistance?

A. Temperature
B.
Length
C.
Material type
D.
Cross-sectional
60.
A 0.09 microfarad capacitor is charged to 220 volts. How long in
milliseconds will it discharged resistor has a resistance of 20,000 ohms?

A.
1.5
B. 1.25
C.
2.5
D.
0.5
61. A trigger circuit consisting of a capacitor of 0.01 µF is
connected in series with a resistor. If the circuit requires 100 Vdc to
operate, determine the value of the resistor when time constant is 0.009s.

A.
900 Ohm
B.
900 MOhm
C. 900 KOhm
D.
900 GOhm
62. The graph between an alternating quantity and time is called
A.
Sine wave
B.
Curve
C. Waveform
D.
A plot
63. Which of the following is the most popular waveform?
A. Sinusoidal
B.
Square wave
C.
Triangular
D.
Sawtooth
64. Which of the following does not refer to electrical energy?
A.
Joule
B. Volt-Ampere
C.
Watt-second
D.
Volt-coulomb
65. What is the resonant frequency of a circuit when L of 25
micro henrys and C of 10 pico farads are in parallel?

A.
10.1 kHz
B. 10.1 MHz
C.
101 MHz
D.
101 kHz
66. And ideal current source has an internal conductance
of_______ Siemen(s)

A.
Infinite
B. Zero
C.
One
D.
One million
67. A capacitance of 6 µµF means
A. 6 pF
B.
6 nF
C.
6 uF
D.
6 aF
68. The voltage cannot be exactly in phase with the current in a
circuit that contains:

B. Only Capacitance
C.
Only resistance
D.
Inductance and capacitance
E.
Inductance, capacitance and resistance
69.
The charge in the capacitor is stored at the:
A.
Terminals
B. Plates
C.
Dielectric
D.
Air
70. The reactance curve is a plot of frequency versus_________
for a series RLC circuit

A.
Voltage
B. Current
C.
Gain
D.
Impedance
71. For a series circuit, the higher the quality factor
A.
The greater the bandwidth
B. The narrower the passband
C.
D.
The wider the pass band
72. “Any resistance R in a branch of a network in which a
current I is flowing can be replaced by a voltage equal to IR”. This states

A. Compensation theorem
B.
Reciprocity theorem
C.
Millman’s theorem
D.
Superposition theorem
73. The internal resistance of an ideal current source is
A. Infinite
B.
Zero
C.
D.
To be determined
74. If three 100-pF capacitors are connected in series, then the
total capacitance is

A.
300 pF
B.
100 pF
C.
50 pF
D. 33.3 pF
75. An inductance of 1 mH is
A. 0.001 H
B.
0.01 H
C.
0.0001 H
D.
0.10 H
76. A capacitor is basically constructed of
A. Two conductors separated by a
dielectric

B.
Two dielectric separated by a conductor
C.
Conductors and dielectric
D.
Conductors and semiconductors
77. In an inductive coil, the rate of rise of current is maximum
A. Near the final maximum value of current
B.
At mid-value of current
C.
At half-power points
D.
After one time constant
78.
Two complex numbers or phasors are said to be conjugate if they
A. Differ only in the algebraic sign of their quadratic components
B.
Differ only in the algebraic sign of their real components
C.
Are equal in their real and quadrature components including algebraic signs
D.
Are equal in their real components but differ in their quadrature components
including algebraic signs.
79. In an ac circuit with a resistive branch and an inductive
branch in parallel, the

A.
Voltage across the inductance leads the voltage across the resistance by 90°
B. Resistive branch current is 90° out of phase with the inductive
branch current

C.
Resistive and inductive branch currents have the same phase
D.
Resistive and inductive branch currents are 180° out-of-phase
80. In an ac circuit with XL and R in series, the
A.
Voltages across R and XL are in phase
B. Voltage across R lags the voltage across XL by 90°
C.
Voltages across R and XL are 180° out-of-phase
D.
Voltage across R leads the voltage across XL by 90°
81. Leakage resistance in a capacitor results into
A. Internal heating
B.
Internal bleeding
C.
Shorter useful life
D.
Short-circuiting
82. Voltage resonance means
A. Series resonance
B.
Parallel resonance
C.
Current magnification
D.
Gain magnification
83. The unit of elastance is
A.
B. Daraf
C.
Siemen
D.
Henry
84. The farad is not equivalent to which of the following
combination of units

A. CV­2
B.
C2/J
C.
C/V
D.
J/V2
85. Which component opposes voltage change?
A.
Resistor
B.
Inductor
C. Capacitor
D.
Transistor
86. What is the peak factor for alternating current or voltage
varying sinusiodally?

A. 1.4142
B.
0.707
C.
0.636
D.
1.11
87. Which of the following is not a factor affecting dielectric
strength?

A. Mass
B.
Moisture content
C.
Temperature
D.
Thickness
88. The superposition theorem is used when the circuit contains
A.
Reactive elements
B.
Active elements
C. Number of voltage sources
D.
Single voltage source
89. What refers to such work at very low temperatures, near
absolute zero?

A. Cryogenics
B.
Superconductivity
C.
Subsonic
D.
Thermionic
90. A factor that states how much the resistance changes for a
change in temperature?

A.
Resistivity
B.
Specific resistance
C.
Coefficient of temperature change
D. Temperature coefficient of resistance
91. An alloy composed of 84 % copper, 12 % manganese and 4 %
nickel.

A. Manganin
B.
Constantan
C.
Nichrome
D.
German silver wire
92. A law which states that when a constant electromotive force
is applied to a circuit consisting of a resistor and capacitor connected in
series, the time taken for the potential on the plates of the capacitor to rise
to any given fraction of its final value depends only on the product of
capacitance and resistance.

A.
Child’s law
B. CR law
C.
Coulomb’s law
D.
Debye T3 law
93. At parallel resonance, the currents flowing through L and C
are

A.
Infinite
B.
Zero
C.
Unequal
D. Equal
94. In a rectangular wave, the peak factor is
A.
1.16
B.
1.73
C.
1.11
D. 1.0
95. In an RL series circuit,
A. Current lags voltage by less than 90˚
B.
Current lags voltage by 180˚
C.
Current lags voltage by 90˚
D.
96. In a pure capacitance,
A. Current leads voltage by 90˚
B.
C.
Current lags voltage by 90˚
D.
Current lags voltage by 180˚
97. The ohmic value of a resistor with negative temperature
coefficient

A.
Increases with increasing temperature
B. Increase with decreasing temperature
C.
Stays unchanged with temperature change
D.
Stays unaffected even with increasing temperature
98. Which of the statements below is not true?
A.
Current source is an active element
B.
Resistor is a linear element
C. Voltage source is a passive element
D.
Diode is a non-linear element
99. Which of the following elements is active?
A.
Resistor
B.
Inductor
C.
Capacitor
D. Ideal voltage source
100. What is the complex impedance of a circuit with an absolute
resistance of 300 Ω?

A.
0 + j 300 Ω
B.
300 + j 90 Ω
C.
0 – j 300 Ω
D. 300 + j 0 Ω

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