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MCQ on Electrical Engineering Emerging Technologies for Students
Quick Quiz
When two or more cells are connected to each other by opposite terminals, then it is called as …….
(a) electric bulb
(b) switch
(c) battery
(d) electric current
Option c – battery
Which of the following instruments is used to measure electric current?
(a) Galvanometer
(b) Rheostat
(c) Voltmeter
(d) Ammeter
Option d – Ammeter
The …… is connected in parallel in an electric circuit.
(a) voltmeter
(b) fuse
(c) galvanometer
(d) ammeter
Option a – voltmeter
A Galvanometer can be converted into a voltmeter by connecting with it an
(a) high resistance in parallel.
(b) low resistance on parallel.
(c) high resistance on series.
(d) low resistance in series.
Option c – high resistance on series
The instrument used for detecting the presence of electric current in a circuit is
(a) refractometer
(b) Galvanometer
(c) Viscometer
(d) Diffractometer
Option b – Galvanometer
The potentiometer is superior to a voltmeter for measuring a potential difference because of
(a) the resistance of the voltmeter.
(b) the potentiometer does not draw any current from the source of the potential.
(c) The sensitivity of the potentiometer is better than that of the voltmeter.
(d) The voltmeter has a dial and is of small size.
Option b – the potentiometer does not draw any current from the source of the potential
……… states that the total current entering a junction is equal to the total current leaving the junction.
(a) Lenz’s Law
(b) Hooke’s Law
(c) Ohm’s Law
(d) Kirchhoff’s First Law
Option d – Kirchhoff’s First Law
“The sum of emf’s and potential differences around a closed loop equals zero” is a consequence of
(a) Ohm’s law
(b) Conservation of charge
(c) Conservation of momentum
(d) Conservation of energy
Option d – Conservation of energy
A given conductor carrying a current of 1 ampere. It produces an amount of heat equal to 2000 J. If the current through the conductor is doubled, then the amount of heat produced will be
(a) 2000 J
(b) 4000 J
(c) 8000 J
(d) 1000 J
Option c – 8000 J
A fuse is a
(a) a safety device that regulates the flow of current.
(b) made up of tin and lead alloy.
(c) has a low melting point.
(d) All of the above
Option d – All of the above
A fuse wire must be
(a) conducting and of low melting point.
(b) conducting and of high melting point.
(c) insulator and of high melting point.
(d) insulator and of low melting point.
Option a – conducting and of low melting point
A fuse wire is made of
(a) an alloy of tin and copper.
(b) an alloy of tin and lead.
(c) an alloy of tin and aluminum.
(d) an alloy of nickel and chromium.
Option b – an alloy of tin and lead
The fuse in an electric circuit is connected in
(a) series with neutral.
(b) parallel to live.
(c) parallel to neutral.
(d) series with live.
Option d – series with live
Inactive nitrogen and argon gases are usually used in electric bulbs in order to
(a) increase the intensity of light emitted.
(b) increase the life of the filament.
(c) make the emitted light-colored.
(d) make the production of bulbs economical.
Option b – increase the life of the filament
The filament in traditional incandescent bulbs is made up of which metal?
(a) Tungsten
(b) Copper
(c) Iron
(d) Platinum
Option a – Tungsten
Tungsten is used for the construction of filament in electric bulbs because of its
(a) high specific resistance
(b) low specific resistance
(d) high melting point
Option b – low specific resistance
The brightness of the bulb decreases gradually with its period of use because of
(a) the evaporation of metal from the filament of the bulb.
(b) decreases in the resistance of the bulb.
(c) decrease in electric supply to the bulb.
(d) None of the above
Option a – the evaporation of metal from the filament of the bulb
The property of electric current which is applicable in the fuse wire is
(a) the chemical effect of current.
(b) magnetic effect of current.
(c) heating effect of current.
(d) the optical property of current.
Option c – heating effect of current
The metal cap of an electric cell is generally the …… terminal of the electrical cell.
(a) negative
(b) positive
(c) neutral
(d) devoid
Option b – positive
Which of the given below devices converts chemical energy into electrical energy?
(a) Transformer
(b) Battery
(c) Electric generator
(d) Wheel
Option b – Battery
Electricity is produced through the dry cell from
(a) chemical energy
(b) thermal energy
(c) mechanical energy
(d) nuclear energy
Option a – chemical energy
What gases are filled in fluorescent tubes?
(A) Neon
(B) Sodium
(C) Mercury
(D) Mercury and neon
Option d – Mercury and neon
In comparison to an electric bulb, a fluorescent tube is preferred because
(A) It has a greater external outer surface to radiate/emit the light
(B) There is no effect of voltage fluctuation on it
(C) In the tube, electric energy is almost converted into light energy
(D) None of the above
Option d – None of the above
How does the white light produce in the tube?
(A) To heat up the copper wire
(B) To heat up the filament
(C) To accelerate the atoms
(D) To oscillate molecule
Option b – To heat up the filament
Fuse wires used for the safety of households have
(A) Low melting point
(B) High melting point
(C) High resistance
(D) Both (A) and (C)
Option d – Both (A) and (C)
The filament of a halogen lamp is an alloy of
(A) Tungsten and iodine
(B) Tungsten and bromine
(C) Tungsten and sodium
(D) Molybdenum and sodium
Option c – Tungsten and sodium
Domestic electrical wiring is basically an
(A) Series connection
(B) Parallel connection
(C) Combination of series and parallel connections
(D) Series connection within each room and parallel connective elsewhere
Option b – Parallel connection
A wire with black insulation during electric supply is
(A) Live wire
(B) Earth wire
(C) Neutral wire
(D) Fuse wire
Option c – Neutral wire
Which gas is filled in normal tube lights?
(A) Sodium vapor with argon
(B) Sodium vapor with neon
(C) Mercury vapor with argon
(D) Mercury vapor with neon
Option c – Mercury vapor with argon
The full form of C.F.L. is
(A) Compact Fluorescent Lamp
(B) Centrally Fixed Lamp
(C) Chemical Fluorescent Lamp
(D) Condensed Fluorescent Lamp
Option a – Compact Fluorescent Lamp
How many units of electricity will be consumed if you use a 60-watt electric bulb for 5 hours every day for 30 days?
(A) 12
(B) 9
(C) 6
(D) 3
Option b – 9
An electric bulb is connected to a 220 V generator. The current is 0.5A. The power of the bulb is
(A) 110 W
(B) 110 V
(C) 440 W
(D) 220 W
Option a – 110 W
Of the two bulbs in a house, one glows brighter than the other. In this context which of the following statements is correct?
(A) The brightness does not depend on the resistance
(B) Both bulbs have same the resistance
(C) The bright bulb has larger resistance
(D) The dim bulb has larger resistance
Option d – The dim bulb has larger resistance
A dynamo that is said to generate electricity actually acts as an
(A) Source of ions
(B) Source of electric charge
(C) Converter of energy
(D) Source of electrons
Option c – Converter of energy
Dynamo is a machine that is used for
(A) Conversion of high voltage to low voltage
(B) Conversion of electrical energy to; mechanical energy
(C) Conversion of mechanical energy to electrical energy
(D) Conversion of low voltage to high voltage
Option c – Conversion of mechanical energy to electrical energy
Turbines and Dynamos are used to convert which energy to electrical energy?
(A) Chemical energy
(B) Solar energy
(C) Mechanical energy
(D) Magnetic energy
Option c – Mechanical energy
When electrical energy is converted into motion ( Emerging trends in electrical engineering mcq )
(A) There is no heat loss
(B) Heat loss is 50 percent
(C) Heat loss is 30 percent
(D) Heat loss is 80 percent
Option a – There is no heat loss
A device that converts electrical energy into mechanical energy is
(A) Dynamo
(B) Transformer
(C) an Electric motor
(D) an Inductor
Option c – an Electric motor
A device that converts chemical energy into electrical energy is called ( Emerging trends in electrical engineering mcq )
(A) Battery
(B) Motor
(C) Generator
(D) Moving coil meter
Option a – Battery
Electric motors operating at low voltages tend to burn out because
(A) They draw more current which is inversely proportional to the voltage
(B) They draw more current which is inversely proportional to the square root of the voltage
(C) They draw heat proportional to v²
(D) Low voltage sets in electrical discharge
Option a – They draw more current which is inversely proportional to the voltage
Five bulbs each of 100-watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be
(A) One unit
(B) Two units
(C) Ten units
(D) Twenty units
Option c – Ten units
A 100-watt electric bulb is used for 10 hours. What will be the cost of electricity consumed, if the consumption cost is 5 per unit?
(A) ₹ 5
(B) ₹ 10
(C) ₹ 25
(D) ₹ 50
Option a – ₹ 5
If a bulb of 100 watt burns for 10 hours, the expenditure of electricity will be
(A) 0-1 unit
(B) 1 unit
(C) 10 units
(D) 100 units
Option b – 1 unit
An electric bulb of 100 watts is used for 4 hours. The unit of electric energy used is ( Emerging trends in electrical engineering mcq )
(A) 400
(B) 25
(C) 4
(D) 0.4
Option d – 0.4
Some pairs of devices and associated energy changes are given below. 1. Electric generator: Mechanical to electrical 2. Electric motor: Electrical to mechanical 3. Diesel engine: Light to electrical 4. Solar cell: Chemical to mechanical Which of the above pair/s is/are correctly matched?
(A) Only 1 and 2
(B) Only 1 and 3
(C) Only 2 and 4
(D) Only 3 and 4
Option a – Only 1 and 2
Assertion (A): In India, electricity distribution companies calculate the consumption of electricity in kWh. Reason (R): Electrical system in India works at a frequency of 60 Hz. Code
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
(C) (A) is true, but (R) is false (D)
(A) is false, but (R) is true
Option c – (A) is true, but (R) is false (D)
Assertion (A): The temperature of a metal wire rises when an electric current is passed through it. Reason (R): Collision of metal atoms with each other releases heat energy. Code
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
(C) (A) is true, but (R) is false
(D) (A) is false, but (R) is true
Option c – (A) is true, but (R) is false
Assertion (A): Light Emitting Diode (LED) lamps offer longer service life as compared to Compact Fluorescent Lamps (CFL). Reason (R): Light Emitting Diode (LED) lamps are more energy efficient as compared to Compact Fluorescent Lamps (CFL). Select the correct answer using the codes given below. Code
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
(C) (A) is true, but (R) is false
(D) (A) is false, but (R) is true
Option a – Both (A) and (R) are true and (R) is the correct explanation of (A)
What is the difference between a CFL and an LED Lamp? 1. To produce light, a CFL uses mercury vapor and phosphor while an LED lamp uses semiconductor material. 2. The average life span of a CFL is much longer than that of an LED lamp. 3. A CFL is less energy efficient as compared to an LED lamp. Which of the statements given above is/are correct?
(A) Only 1
(B) Only 2 and 3
(C) Only 1 and 3
(D) 1, 2 and 3
Option c – Only 1 and 3
Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). Assertion (A): Transformer is useful for stepping up or stepping down voltages. Reason (R): Transformer is a device used in D.C. circuits. In the context of the above two statements, which one of the following is correct?
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
(C) (A) is true, but (R) is false
(D) (A) is false, but (R) is true
Option c – (A) is true, but (R) is false
Consider the following statements. Assertion (A): Lightning conductors prevent buildings from damage in the event of a lightning strike. Reason (R): The electric charge is conducted to the ground through the wire, instead of passing through the structure. Select the correct answer using the codes given below. Code
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
(C) (A) is true, but (R) is false
(D) (A) is false, but (R) is true
Option b – Both (A) and (R) are true and (R) is the correct explanation of (A)
Which of the following option represents the consumption of power in ascending order?
(A) Television, fan, electronic press, electronic kettle
(B) Television, fan, electronic kettle, electronic press
(C) Fan, television, electronic press, electronic kettle
(D) Electronic press, electronic kettle, fan, television
Option c – Fan, television, electronic press, electronic kettle
The Earth’s magnetic field is due to
(A) Currents circulating inside the core
(B) the Presence of a huge magnet at its center
(C) Moving charges in space outside
(D) None of the above
Option a – Currents circulating inside the core
Nickel-Cadmium (Ni-Cd) battery is used in ( Emerging trends in electrical engineering mcq )
(A) Calculator
(B) Cordless electronic appliances
(C) Transistors
(D) All of the above
Option d – All of the above
The electricity consumption bill is based on the measurement of 1. Watt 2. Voltage 3. Ohm 4. Ampere Select your answer to the following codes.
(A) Only 1
(B) Only 1 and 2
(C) Only 2 and 3
(D) Only 1 and 4
Option a – Only 1
Consider the following statements regarding a motor car battery. 1. The voltage is usually 12V. 2. Electrolyte used is hydrochloric acid. 3. Electrodes are lead and copper. 4. Capacity is expressed in ampere-hours. Which of the above statements is correct?
(A) Only 1 and 2
(B) Only 2 and 3
(C) Only 3 and 4
(D) Only 1 and 4
Option d – Only 1 and 4
Consider the following statements. An ordinary light bulb has a rather short life because the 1. The filament wire is not uniform. 2. Bulb cannot be evacuated completely. 3. Wires supporting the filament melt at high temperatures. Which of the above statements is correct?
(A) Only 1 and 3
(B) Only 2 and 3
(C) Only 1 and 3
(D) 1, 2 and 3
Option d – 1, 2 and 3
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