Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 117 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

In a lamp load when more than one lamp are switched on the total resistance of the load_____________?
A. increases
B. decreases
C. remains same
D. none of the above
Answer» C. remains same
Discussion
2.

The voltage induced in an inductor is represented as,
A. product of its inductance and current through it.
B. ratio of its inductance to the current through it.
C. ratio of the current through it to its inductance.
D. product of its inductance and rate of change of current through it.
Answer» E.
Discussion
3.

Capacitor does not allow the sudden change of ?
A. current
B. voltage
C. power
D. None of the above
Answer» C. power
Discussion
4.

With rise in temperature the resistance of pure metals______________?
A. increases
B. decreases
C. first increases and then decreases
D. remains constant
Answer» B. decreases
Discussion
5.

The resistance of a conductor varies inversely as___________?
A. length
B. area of cross-section
C. temperature
D. resistivity
Answer» C. temperature
Discussion
6.

Magnetic flux has the unit of
A. Newton
B. Ampere-turn
C. Weber
D. Tesla
Answer» D. Tesla
Discussion
7.

If P is the power of a star connected system then what will be power of an equivalent delta connected system?
A. P
B. 3P
C. P/3
D. None of the above
Answer» C. P/3
Discussion
8.

Which of the followings is/are active element?
A. Voltage source
B. Current source
C. Both
D. None of these
Answer» D. None of these
Discussion
9.

Internal resistance of ideal voltage source is ?
A. zero
B. infinite
C. finite
D. 100 ohms
Answer» B. infinite
Discussion
10.

Which quantity consists of a unit 1KWh ?
A. Energy
B. Time
C. Power
D. Charge
Answer» B. Time
Discussion
11.

Which of the following are the passive elements?
A. Resistor
B. Bulb
C. Both
D. None of these
Answer» D. None of these
Discussion
12.

Inductor does not allow the sudden change of
A. current
B. voltage
C. power
D. None of the above
Answer» B. voltage
Discussion
13.

Power dissipation in ideal inductor is
A. Maximum
B. Minimum
C. Zero
D. A finite value
Answer» D. A finite value
Discussion
14.

A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________?
A. 400 Q
B. 600 Q
C. 800 Q
D. 1000 Q
Answer» D. 1000 Q
Discussion
15.

Which of the following quantities consists of SI unit as WATT ?
A. Force
B. Charge
C. Current
D. Power
Answer» E.
Discussion
16.

Internal resistance of ideal current source is ?
A. zero
B. infinite
C. finite
D. 100 ohms
Answer» C. finite
Discussion
17.

Conductance is reciprocal of____________?
A. resistance
B. inductance
C. reluctance
D. capacitance
Answer» B. inductance
Discussion
18.

Which quantity should be measured by the voltmeter ?
A. Current
B. Voltage
C. Power
D. Speed
Answer» C. Power
Discussion
19.

Which of the following has no units?
A. Permeability
B. Moment of a magnet
C. Magnetic susceptibility
D. Permittivity
Answer» D. Permittivity
Discussion
20.

The substances which have a large number of free electrons and offer a low resistance are called____?
A. insulators
B. inductors
C. semi-conductors
D. conductors
Answer» E.
Discussion
21.

The property of a conductor due to which it passes current is called___________?
A. resistance
B. reluctance
C. conductance
D. inductance
Answer» D. inductance
Discussion
22.

Electric pressure is also called________?
A. resistance
B. power
C. voltage
D. energy
Answer» D. energy
Discussion
23.

In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is
A. 33 V
B. 66 v
C. 80 V
D. 132 V
Answer» C. 80 V
Discussion
24.

Out of the following which is not a poor conductor__________?
A. Cast iron
B. Copper
C. Carbon
D. Tungsten
Answer» C. Carbon
Discussion
25.

Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?
A. 100 Ω
B. 200 Ω
C. 300 Ω
D. 400 Ω
Answer» E.
Discussion
26.

Out of the following which is an insulating material____________?
A. Copper
B. Gold
C. Silver
D. Paper
Answer» E.
Discussion
27.

With rise in temperature the resistance of semi-conductors_________________?
A. decreases
B. increases
C. first increases and then decreases
D. remains constant
Answer» B. increases
Discussion
28.

How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
A. 10
B. 60
C. 600
D. 1200
Answer» D. 1200
Discussion
29.

If 1 A current flows in a circuit, the number of electrons flowing through this circuit is
A. 0.625 × 10¹⁹
B. 1.6 × 10¹⁹
C. 1.6 × 10⁻¹⁹
D. 0.625 × 10⁻¹⁹
Answer» B. 1.6 × 10¹⁹
Discussion
30.

An instrument which detects electric current is known as_____________?
A. voltmeter
B. rheostat
C. wattmeter
D. galvanometer
Answer» E.
Discussion
31.

Current velocity through a copper conductor is___________?
A. the same as propagation velocity of electric energy
B. independent of current strength
C. of the order of a few ^.s/m
D. nearly 3 x 108 m/s
Answer» D. nearly 3 x 108 m/s
Discussion
32.

The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?
A. 18 Q
B. 36 Q
C. 48 Q
D. 64 Q
Answer» C. 48 Q
Discussion
33.

The unit of resistivity is
A. Ω
B. Ω – metre.
C. Ω / metre.
D. Ω / m².
Answer» C. Ω / metre.
Discussion
34.

A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is_____________?
A. 6.4 A, 6.9 A
B. 6.4 A, 9.6 A
C. 4.6 A, 6.9 A
D. 4.6 A, 9.6 A
Answer» C. 4.6 A, 6.9 A
Discussion
35.

Two resistors are said to be connected in series when___________?
A. same current passes in turn through both
B. both carry the same value of current
C. total current equals the sum of branch currents
D. sum of IR drops equals the applied e.m.f.
Answer» B. both carry the same value of current
Discussion
36.

The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around_______________?
A. 1.2 x 10~8 Q-m
B. 1.4 x 10~8 Q-m
C. 1.6 x 10″”8 Q-m
D. 1.8 x 10″8 Q-m
Answer» D. 1.8 x 10″8 Q-m
Discussion
37.

Which of the following material has nearly zero temperature co-efficient of resistance_________?
A. Manganin
B. Porcelain
C. Carbon
D. Copper
Answer» B. Porcelain
Discussion
38.

You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect__________?
A. two in parallel
B. two in parallel and one in series
C. three in parallel
D. three in series
Answer» C. three in parallel
Discussion
39.

Instantaneous power in inductor is proportional to the
A. product of the instantaneous current and rate of change of current
B. square of instantaneous current
C. square of the rate of change of current
D. Temperature of the inductor
Answer» B. square of instantaneous current
Discussion
40.

The resistivity of the conductor depends on
A. area of the conductor
B. length of the conductor
C. type of material
D. none of these
Answer» D. none of these
Discussion
41.

The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be
A. R Ω
B. 2R Ω
C. 4R Ω
D. 8R Ω
Answer» E.
Discussion
42.

An open resistor, when checked with an ohm-meter reads_____________?
A. zero
B. infinite
C. high but within tolerance
D. low but not zero
Answer» C. high but within tolerance
Discussion
43.

A field of force can exist only between_____________?
A. two molecules
B. two ions
C. two atoms
D. two metal particles
Answer» C. two atoms
Discussion
44.

International ohm is defined in terms of the resistance of________________?
A. a column of mercury
B. a cube of carbon
C. a cube of copper
D. the unit length of wire
Answer» B. a cube of carbon
Discussion
45.

The condition for the validity under Ohm’s law is that_______________?
A. resistance must be uniform
B. current should be proportional to the size of the resistance
C. resistance must be wire wound type
D. temperature at positive end should be more than the temperature at negative end
Answer» B. current should be proportional to the size of the resistance
Discussion
46.

Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as________?
A. 4 : 25
B. 25 : 4
C. 2 : 5
D. 5 : 2
Answer» D. 5 : 2
Discussion
47.

When current flows through heater coil it glows but supply wiring does not glow because______________?
A. current through supply line flows at slower speed
B. supply wiring is covered with insulation layer
C. resistance of heater coil is more than the supply wires
D. supply wires are made of superior material
Answer» D. supply wires are made of superior material
Discussion
48.

Which of the following statement is correct_______________?
A. A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator
B. A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator
C. A semi-conductor is one which con¬ducts only half of the applied voltage
D. A semi-conductor is a material made of alternate layers of conducting material and insulator
Answer» B. A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator
Discussion
49.

A rheostat differs from potentiometer in the respect that it_____________?
A. has lower wattage rating
B. has higher wattage rating
C. has large number of turns
D. offers large number of tapping
Answer» C. has large number of turns
Discussion
50.

Voltage dependent resistors are usually made from________________?
A. Charcoal
B. Silicon Carbide
C. Nichrome
D. Graphite
Answer» C. Nichrome
Discussion