# DMRC JE/SSC JE/CIL MT ELECTRICAL ENGINEERING IMPORTANT MCQ PART 1(BASIC ELECTRICAL)

1. Conventional flow assumes charges flow from:
A. Positive to negative
B.
Positive to positive
C.
Negative to positive
D.
Negative to negative
2. Electron flow assumes charges flow from:
A. Negative to positive
B.
Negative to negative
C.
Positive to negative
D.
Positive to positive
3.
Series resonance occurs
when:

A.
XL = Xc
B.
XL=R
C.
Z=R
D.
Both A and C
4. The symbol Q refers to:
A.
Resonance quotient
B.
Quality factor
C.
Power quotient
D.
Qualification test
5.
The ratio of W/VA in an
AC circuit means:

A. Power Factor
B.
Reactive factor
C.
Quality factor
D.
6. What is the reciprocal of quality factor?
A.
Power factor
B.
Dissipation Factor
C.
Reactive factor
D.
1 /Q factor
7.
In liquids and gases,
ionization current results from a flow of:

A.
Positive or negative ions
B. Free Electrons
C.
Ions that are lighter in weight than electrons:
D.
Protons
8. VL = Vc in a series RLC circuit when:

A.
The value of the impedance is minimum
B.
The power factor is zero
C.
The current leads the total voltage by 90°
D.
The total voltage is zero
9. At what frequency will an inductor of 5mH have the same
reactance as a capacitor of 0.1 µF?

A.
7.12 KHz
B.
7.12 Hz
C.
7.12MHz
D.
7.12 GHz
10. Property of an electric circuit that dissipates electric
energy:

A.
Reactance
B.
Impedance
C. Resistance
D.
Conductance
11. What is the other name of relative permittivity?
A.
Dielectric strength
B.
C.
Breakdown voltage
D. Specific inductance capacity
12. In a series RLC circuit

A. The current lags VL by 90°
B.
The current leads VL by 90°
C.
D.
Z = jXL at resonance
13.
Resistor with colored
bands in the body

A.
Wire-wound resistor
B. Carbon-composition resistor
C.
Potentiometer
D.
Rheostat
14. In a resonant circuit, if Q > 10 resonant frequency______
bandwidth.

A. Bisects
B.
Exceeds
C.
Is less than
D.
Is equal to
15. Which of the following conditions is not true for a series
RLC circuit at resonance?

A. Z=j XL
B.
XL = Xc
C.
The power factor is one.
16. The current is ————- times the maximum current at
half-power points of a resonance curve.

A. 0.707
B.
1.414
C.
0.5
D.
0.632
17. A gang capacitor is a variable capacitor in which
capacitance is varied by changing the:

A.
Dielectric
B.
Number of plates
C.
Distance between plates
D. Plate Area
18. In an ac circuit with inductive reactance, the
A.
Phase angle of the circuit is always 45°
B.
Voltage across the inductance must be 90° out-of-phase with the applied voltage

C. Current through the inductance lags its induced voltage by 90°
D.
Current through the inductance and voltage across it are l80° out-of-phase
19. If three 9 mH inductors are connected in parallel without
mutual inductance then the total inductance is

A. 3 mH
B.
9 mH
C.
27 mH
D.
18 mH
20. What is the specific resistance of a pure germanium?
A. 55 Ohm-cm
B.
55 Ohm-m
C.
55 Ohm-mm
D.
55 KOhm-m

21. Two capacitors of capacitance 9 µF and 18 µF in series will
have a total capacitance of:

A.
27 µF
B. 6 pF
C.
162 µF
D.
180 µF
22. In a series RLC circuit:
A.
Increasing the frequency decreases the resistance
B. Both XL and Xc change as frequency changes
C.
Increasing the frequency increases the resistance
D.
Impedance will always decrease
23. A series RLC circuit has a ________ power factor at its
half-power points

A.
Unity
B.
C.
Lagging
D. Either B or C
24.
Kirchhoff’s laws (KCL and KVL) are applicable to:
A.
DC circuits
B.
AC circuits
C.
Passive networks alone
D. DC as well AC circuits
25.
A tank circuit is a:
A. Parallel LC Circuit
B.
Series LC circuit
C.
A resonant circuit
D.
A non-resonant circuit
26. A capacitive load always has a______ power factor.
B.
Lagging
C.
Zero
D.
Unity
27. What is the temperature coefficient of the resistance
Eureka?

A.
Infinity
B.
Negative
C. Almost Zero
D.
Positive
28. As applied to a series RLC circuit, bandwidth means
A.
The frequency range for maximum power transfer
B.
The difference between the highest and lowest frequencies of the oscillator
C.
The frequency at which XL = Xc
D. The separation of the half-power points
29.
Which is considered as the effect of a dielectric material?
A.
Increasing capacitance
B.
Decreasing capacitance
C.
Reducing the working voltage
D.
Increasing the distance between the plates
30. The open-circuit voltage at the terminal of load RL is 60V.
Under the condition of maximum power transfer, the load voltage will be:

A.
60 V
B.
15 V
C. 30V
D.
20 V
31. If a capacitor is rated for 200V dc, what is its effective
ac working voltage?

A.
50 V
B.
100 V
C. 200 V
D.
400 V
32. If resonant frequency is 10 kHz and quality factor is 50,
then

A. Bandwidth is 200 Hz
B.
XL = is 50,000 Ohm
C.
R is 50 Ohm
D.
XC = is 50,000 Ohm
33.
Which statement is true?
A.
A series resonant circuit is of high impedance
B.
A parallel resonant circuit is of low impedance
C. A series resonant circuit is inductive if it operates at a
frequency higher than resonant frequency

D.
A parallel resonant circuit is inductive if it operates at a frequency higher
than the resonant frequency
34. What is considered as the most important value of a sine
wave?

A. Effective value
B.
Peak value
C.
Average value
D.
Instantaneous value
35. An
AC series circuit is composed of a resistance of 20 ohm, inductive reactance of
40 ohm, and a capacitive reactance of 15 ohm. If a current of 1 ampere is
flowing, what is the applied voltage?

A.
320 V
B. 32 V
C.
220 V
D.
22 V
36.
An intermittent and non-symmetrical alternating current like that obtained from
the secondary winding of an induction coil

B.
Transient ac current
C.
Inductive current
D.
Capacitive current
37.
The value of temperature coefficient (alfa) is dependent upon
A.
The nature of material and temperature
B.
The length of material
C.
The cross-sectional area of the material
D.
The volume of the material
38.
At what frequency will the current in a series RLC circuit reach its maximum
value for an applied voltage of 15 V with R = 500 ohm , L = 100 µH and C =
0.001 µF?

A.
403 kHz
B. 503 KHz
C.
603 kHz
D.
303 kHz
39.
If two equal resistances connected in series across a certain supply are now
connected in parallel across the same supply, the power produced will be
__________ that of series connection:

A.
One-half
B. Four times
C.
One-fourth
D.
Two times
40. The voltage lags the current by Pi/2 cycle in a:
A.
Purely resistive circuit
B.
Purely inductive circuit
C. Purely capacitive circuit
D.
Circuit containing resistance, capacitance and inductance

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