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.

51.

Resistance of a material always decreases if___________?
A. temperature of material is decreased
B. temperature of material is increased
C. number of free electrons available become more
D. none of the above is correct
Answer» D. none of the above is correct
Discussion
52.

All good conductors have high____________?
A. conductance
B. resistance
C. reluctance
D. thermal conductivity
Answer» B. resistance
Discussion
53.

A glass rod when rubbed with silk cloth is charged because__________?
A. it takes in proton
B. its atoms are removed
C. it gives away electrons
D. it gives away positive charge
Answer» D. it gives away positive charge
Discussion
54.

Electric current passing through the circuit produces_____________?
A. magnetic effect
B. luminous effect
C. thermal effect
D. chemical effect
E. all above effects
Answer» F.
Discussion
55.

An electric filament bulb can be worked from____________?
A. D. C. supply only
B. A. C. supply only
C. Battery supply only
D. All above
Answer» E.
Discussion
56.

When electric current passes through a metallic conductor, its temperature rises. This is due to__________?
A. collisions between conduction electrons and atoms
B. the release of conduction electrons from parent atoms
C. mutual collisions between metal atoms
D. mutual collisions between conducting electrons
Answer» B. the release of conduction electrons from parent atoms
Discussion
57.

If the efficiency of a machine is to be high, what should be low __________?
A. Input power
B. Losses
C. True component of power
D. kWh consumed
E. Ratio of output to input
Answer» C. True component of power
Discussion
58.

It becomes more difficult to remove_________________?
A. any electron from the orbit
B. first electron from the orbit
C. second electron from the orbit
D. third electron from the orbit
Answer» E.
Discussion
59.

Ohm’s law is not applicable to__________?
A. semi-conductors
B. D. C. circuits
C. small resistors
D. high currents
Answer» B. D. C. circuits
Discussion
60.

Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?
A. 9 times
B. 1/9 times
C. 1/3 times
D. 3 times
Answer» C. 1/3 times
Discussion
61.

A substance whose molecules consist of dissimilar atoms is called____________?
A. semi-conductor
B. super-conductor
C. compound
D. insulator
Answer» D. insulator
Discussion
62.

Varistors are______________?
A. insulators
B. non-linear resistors
C. carbon resistors
D. resistors with zero temperature coefficient
Answer» C. carbon resistors
Discussion
63.

Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?
A. 3/2 Q
B. 6 Q
C. 4 Q
D. 8/3 Q
Answer» D. 8/3 Q
Discussion
64.

When one leg of parallel circuit is opened out the total current will______________?
A. reduce
B. increase
C. decrease
D. become zero
Answer» D. become zero
Discussion
65.

Which method can be used for absolute measurement of resistances _______________?
A. Lorentz method
B. Releigh method
C. Ohm’s law method
D. Wheatstone bridge method
Answer» B. Releigh method
Discussion
66.

A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?
A. 80 m
B. 60 m
C. 40 m
D. 20 m
Answer» E.
Discussion
67.

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?
A. 160 ohms
B. 80 ohms
C. 20 ohms
D. 10 ohms
Answer» E.
Discussion
68.

Temperature co-efficient of resistance is expressed in terms of___________?
A. ohms/°C
B. mhos/ohm°C
C. ohms/ohm°C
D. mhos/°C
Answer» D. mhos/°C
Discussion
69.

Whether circuit may be AC. or D. C. one, following is most effective in reducing the magnitude of the current?
A. Reactor
B. Capacitor
C. Inductor
D. Resistor
Answer» E.
Discussion
70.

For which of the following ‘ampere second’ could be the unit ?
A. Reluctance
B. Charge
C. Power
D. Energy
Answer» C. Power
Discussion
71.

The ratio of mass of proton to that of electron is nearly_____________?
A. 1840
B. 1840
C. 30
D. 4
Answer» B. 1840
Discussion
72.

Voltage dependent resistors are used_____________?
A. for inductive circuits
B. to supress surges
C. as heating elements
D. as current stabilizers
Answer» C. as heating elements
Discussion
73.

Which of the following statement is true both for a series and a parallel D. C. circuit?
A. Elements have individual currents
B. Currents are additive
C. Voltages are additive
D. Power are additive
Answer» E.
Discussion
74.

Which of the following materials has a negative temperature co-efficient of resistance?
A. Copper
B. Aluminum
C. Carbon
D. Brass
Answer» D. Brass
Discussion
75.

The number of electrons in the outer most orbit of carbon atom is___________?
A. 3
B. 4
C. 6
D. 7
Answer» C. 6
Discussion
76.

All of the following are equivalent to watt except_____________?
A. (amperes) ohm
B. joules/seC.
C. amperes x volts
D. amperes/volt
Answer» E.
Discussion
77.

Ohm’s law is not applicable to____________?
A. vacuum tubes
B. carbon resistors
C. high voltage circuits
D. circuits with low current densities
Answer» B. carbon resistors
Discussion
78.

Which is the best conductor of electricity _______________?
A. Iron
B. Silver
C. Copper
D. Carbon
Answer» C. Copper
Discussion
79.

Which one of the following does not have negative temperature co-efficient ____________?
A. Aluminium
B. Paper
C. Rubber
D. Mica
Answer» B. Paper
Discussion
80.

Insulating materials have the function of______________?
A. preventing a short circuit between conducting wires
B. preventing an open circuit between the voltage source and the load
C. conducting very large currents
D. storing very high currents
Answer» B. preventing an open circuit between the voltage source and the load
Discussion
81.

A thermistor has_____________?
A. positive temperature coefficient
B. negative temperature coefficient
C. zero temperature coefficient
D. variable temperature coefficient
Answer» D. variable temperature coefficient
Discussion
82.

With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
A. 10 W
B. 20 W
C. 40 W
D. 60 W
Answer» E.
Discussion
83.

If/, R and t are the current, resistance and time respectively, then according to Joule’s law heat produced will be proportional to_______________?
A. I2Rt
B. I2Rf
C. I2R2t
D. I2R2t*
Answer» B. I2Rf
Discussion
84.

Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?
A. 100 W lamp will glow brighter
B. 40 W lamp will glow brighter
C. Both lamps will glow equally bright
D. 40 W lamp will fuse
Answer» C. Both lamps will glow equally bright
Discussion
85.

Switching of a lamp in house produces noise in the radio. This is because switching operation produces________?
A. arcs across separating contacts
B. mechanical noise of high intensity
C. both mechanical noise and arc between contacts
D. none of the above
Answer» B. mechanical noise of high intensity
Discussion
86.

The resistance of a few meters of wire conductor in closed electrical circuit is____________?
A. practically zero
B. low
C. high
D. very high
Answer» B. low
Discussion
87.

When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is____________?
A. A. C.
B. D. C.
C. any of above two
D. none of the above
Answer» C. any of above two
Discussion
88.

74. Sparking occurs when a load is switched off because the circuit has high_________?
A. resistance
B. inductance
C. capacitance
D. impedance
Answer» C. capacitance
Discussion
89.

In the case of direct current____________?
A. magnitude and direction of current remains constant
B. magnitude and direction of current changes with time
C. magnitude of current changes with time
D. magnitude of current remains constant
Answer» B. magnitude and direction of current changes with time
Discussion
90.

Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
A. 1/9 times
B. 3 times
C. 9 times
D. unchanged
Answer» D. unchanged
Discussion
91.

Bulbs in street lighting are all connected in_____________?
A. parallel
B. series
C. series-parallel
D. end-to-end
Answer» B. series
Discussion
92.

For testing appliances, the wattage of test lamp should be_____________?
A. very low
B. low
C. high
D. any value
Answer» D. any value
Discussion
93.

Insulating materials have the function of___________?
A. preventing a short circuit between conducting wires
B. preventing an open circuit between the voltage source and the load
C. conducting very large currents
D. storing very high currents
Answer» C. conducting very large currents
Discussion
94.

The rating of a fuse wire is always expressed in________________?
A. ampere-hours
B. ampere-volts
C. kWh
D. amperes
Answer» E.
Discussion
95.

In a series circuit with unequal resistances______________?
A. the highest resistance has the most of the current through it
B. the lowest resistance has the highest voltage drop
C. the lowest resistance has the highest current
D. the highest resistance has the highest voltage drop
Answer» E.
Discussion
96.

The minimum charge on an ion is______________?
A. equal to the atomic number of the atom
B. equal to the charge of an electron
C. equal to the charge of the number of electrons in an atom (#) zero
Answer» C. equal to the charge of the number of electrons in an atom (#) zero
Discussion
97.

The filament of an electric bulb is made of______________?
A. carbon
B. aluminium
C. tungsten
D. nickel
Answer» D. nickel
Discussion
98.

Which of the following statement is true________________?
A. A galvanometer with low resistance in parallel is a voltmeter
B. A galvanometer with high resistance in parallel is a voltmeter
C. A galvanometer with low resistance in series is an ammeter
D. A galvanometer with high resistance in series is an ammeter
Answer» D. A galvanometer with high resistance in series is an ammeter
Discussion
99.

If a parallel circuit is opened in the main line, the current_______________?
A. increases in the branch of the lowest resistance
B. increases in each branch
C. is zero in all branches
D. is zero in the highest resistive branch
Answer» D. is zero in the highest resistive branch
Discussion
100.

Conductance : mho :: ____________?
A. resistance : ohm
B. capacitance : henry
C. inductance : farad
D. lumen : steradian
Answer» B. capacitance : henry
Discussion