Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 99 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.

The formula __________ determines the number of electrons that can be accommodated in any level?
A. 2n2
B. 4n2
C. 2n3
D. 4ns
Answer» B. 4n2
Discussion
2.

In conductors conduction of electricity takes place due to movement of_______________?
A. electrons only
B. positive ions only
C. negative ions only
D. positive and negative ions
E. none of the above
Answer» B. positive ions only
Discussion
3.

__________ is the main constituent of glass?
A. Fe203
B. Si02
C. AI2O3
D. B2O3
Answer» C. AI2O3
Discussion
4.

The impurity atoms is semiconductors_____________?
A. inject more charge carriers
B. reduce the energy gap
C. increase the kinetic energy of valence electrons
D. all of the above
Answer» C. increase the kinetic energy of valence electrons
Discussion
5.

The tiny block formed by the arrangement of a small group of atoms is called the____________?
A. unit cell
B. space lattice
C. either A. or (b)
D. none of the above
Answer» B. space lattice
Discussion
6.

The covalent bond is formed by_______________?
A. transfer of electrons between atoms
B. sharing of electrons between atoms
C. sharing of variable number of electrons by a variable number of atoms
D. none of the above
Answer» C. sharing of variable number of electrons by a variable number of atoms
Discussion
7.

is a negatively charged particle present in an atom______________?
A. Proton
B. Neutron
C. Electron
D. None of the above
Answer» D. None of the above
Discussion
8.

Which of the following factors affect resistivity of metals ?
A. Age hardening
B. Alloying
C. Temperature
D. Cold work
E. All of the above
Answer» F.
Discussion
9.

The co-ordination number of a simple cubic structure is______________?
A. 2
B. 4
C. 6
D. 8
Answer» D. 8
Discussion
10.

The converse of hardness is known as______________?
A. malleability
B. toughness
C. softness
D. none of the above
Answer» D. none of the above
Discussion
11.

The kinetic energy of a bounded electron is______________?
A. less than that of unbounded electron
B. greater than that of unbounded electron
C. equal to that of unbounded electron
D. infinite
E. none of the above
Answer» B. greater than that of unbounded electron
Discussion
12.

Commonly used conducting materials are_____________?
A. copper
B. aluminium
C. both (A) and (B)
D. copper and silver
E. platinum and gold
Answer» D. copper and silver
Discussion
13.

A perfect conductor has_____________?
A. zero conductivity
B. unity conductivity
C. infinite conductivity
D. none of the above
Answer» D. none of the above
Discussion
14.

Selenium is __________ semiconductor?
A. extrnisic
B. intmisic
C. N-type
D. P-type
Answer» C. N-type
Discussion
15.

For a hole which of the following statements is incorrect ?
A. Holes can exist in certain semiconductors only
B. Holes can exist in any material including conductors
C. Holes may constitute an electric current
D. Holes can be considered as a net positive charge
Answer» C. Holes may constitute an electric current
Discussion
16.

Superconducting metal in super conducting state has relative permeability of________________?
A. zero
B. one
C. negative
D. more than one
Answer» B. one
Discussion
17.

The conductors have transport phenomena of electrons due to____________?
A. electric field
B. magnetic field
C. electromagnetic field
D. none of the above
Answer» B. magnetic field
Discussion
18.

The photo-electric effect occurs only when the incident light has more than a certain critical____________?
A. intensity
B. speed
C. frequency
D. wave length
Answer» D. wave length
Discussion
19.

For a particular material the Hall coefficient was found to be zero. The material is______________?
A. insulator
B. metal
C. intrinsic semiconductor
D. none of the above
Answer» C. intrinsic semiconductor
Discussion
20.

Piezoelectric materials serve as a source of ____________ ?
A. resonant waves
B. musical waves
C. microwaves
D. ultrasonic waves
Answer» E.
Discussion
21.

___________ has the best damping properties?
A. Diamond
B. High speed steel
C. Mild steel
D. Cast iron
Answer» E.
Discussion
22.

If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as____________?
A. non-linear conductor
B. reverse conductor
C. bad-conductor
D. non-conductor
Answer» B. reverse conductor
Discussion
23.

Spark plug makes use of which of the following materials for insulation ?
A. Porcelain
B. Slate
C. Asbestos
D. Glass
Answer» B. Slate
Discussion
24.

Due to which of the following fact, in India, aluminium is replacing copper ?
A. Aluminium is more ductile and malleable than copper
B. Aluminium is available in plenty, cheaper and lighter than copper
C. Aluminium has lower resistivity than that of copper
D. Aluminium has less temperature co-efficient than copper
Answer» C. Aluminium has lower resistivity than that of copper
Discussion
25.

The forbidden gap in an insulator is________________?
A. large
B. small
C. nil
D. any of the above
Answer» B. small
Discussion
26.

Overhead telephone wires are made of_____________?
A. aluminium
B. steel
C. ACSR conductors
D. copper
Answer» C. ACSR conductors
Discussion
27.

_________ is an example of piezoelectric material?
A. Glass
B. Quartz
C. Corrundum
D. Neoprene
Answer» C. Corrundum
Discussion
28.

A good electric contact material should have all of the following properties except_____________?
A. high resistivity
B. high resistance to corrosion
C. good thermal conductivity
D. high melting point
Answer» B. high resistance to corrosion
Discussion
29.

Thermonic emission occurs in______________?
A. vacuum tubes
B. copper conductors
C. ferrite cores
D. transistors
Answer» B. copper conductors
Discussion
30.

__________ is a hard solder?
A. Tin-lead
B. Tin-silver-lead
C. Copper-zinc
D. None of the above
Answer» D. None of the above
Discussion
31.

Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?
A. increases
B. decreases
C. does not change
Answer» B. decreases
Discussion
32.

Which of the following affect greatly the resistivity of electrical conductors ?
A. Composition
B. Pressure
C. Size
D. Temperature
Answer» B. Pressure
Discussion
33.

Most of the common metals have _________ structure?
A. linear
B. hexagonal
C. orthorhombic
D. cubic
Answer» E.
Discussion
34.

Super conductivity can be destroyed by_____________?
A. adding impurities
B. reducing temperatures
C. application of magnetic field
D. any of the above
Answer» D. any of the above
Discussion
35.

Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
A. Nichrome
B. Constantan
C. Kanthal
D. Molybdenum
Answer» B. Constantan
Discussion
36.

Which of the following materials does not have covalent bonds ?
A. Organic polymers
B. Silicon
C. Metals
Answer» D.
Discussion
37.

Constantan contains_______________?
A. silver and tin
B. copper and tungsten
C. tungsten and silver
D. copper and nickel
Answer» E.
Discussion
38.

Which of the following are non-conductors of electricity?
A. Non-metal solids except carbon
B. Air and most other gases
C. Pure water and liquids in general except mercury
D. All of the above
Answer» E.
Discussion
39.

Which of the following variety of copper has the best conductivity ?
A. Induction hardened copper
B. Hard drawn copper
C. Pure annealed copper
D. Copper containing traces of silicon
Answer» D. Copper containing traces of silicon
Discussion
40.

Which of the following is the poorest conductor of electricity ?
A. Carbon
B. Steel
C. Silver
D. Aluminium
Answer» B. Steel
Discussion
41.

___________ is most commonly used for making magnetic recording tape?
A. Silver nitrate
B. Ferric oxide
C. Small particles of iron
D. Silicon-iron
Answer» C. Small particles of iron
Discussion
42.

In thermocouples which of the following pairs is commonly used ?
A. Copper-constantan
B. Aluminium-tin
C. Silver-German silver
D. Iron-steel
Answer» B. Aluminium-tin
Discussion
43.

Carbon electrodes are not used in_______________?
A. GLS lamps
B. electric arc furnace
C. dry cells
D. cinema projectors
Answer» B. electric arc furnace
Discussion
44.

On which of the following factors does the resistivity of a material depend ?
A. Resistance of the conductor
B. Area of the conductor section
C. Length of the conductor
D. All of the above
Answer» E.
Discussion
45.

Solder is an alloy of______________?
A. copper and aluminium
B. tin and lead
C. nickel, copper and zinc
D. silver, copper and lead
Answer» C. nickel, copper and zinc
Discussion
46.

An H.R.C. fuse is_______________?
A. a ceramic body having metal and caps
B. a wire of platinum
C. a heavy cross-section of copper or aluminium
D. a ceramic tube having carbon rod inside it
Answer» B. a wire of platinum
Discussion
47.

Mercury as an electric contact material is_______________?
A. a liquid
B. a metal
C. a metal liquid
D. a gas
Answer» D. a gas
Discussion
48.

The coils of D.C. motor starter are wound with wire of_______________?
A. copper
B. kanthal
C. manganin
D. nichrome
Answer» D. nichrome
Discussion
49.

By increasing impurity content in the metal alloy the residual resistivity always_____________?
A. decreases
B. increases
C. remains constant
D. becomes temperature independent
Answer» C. remains constant
Discussion
50.

Low resistivity materials are used in__________?
A. transformer, motor and generator windings
B. transmission and distribution lines
C. house wiring
D. all above applications
Answer» E.
Discussion