Electrical Engineering Materials MCQs

Option A: forward biasing voltage

Option B: reverse biasing voltage

Option C: temperature

Option D: the amount of doping

Correct Answer: temperature ✔

Option A: equal to

Option B: less than

Option C: greater than

Option D: any of the above

Correct Answer: greater than ✔

Option A: 0.15 eV

Option B: 0.25 eV

Option C: 0.5eV

Option D: 0.7eV

Correct Answer: 0.7eV ✔

Option A: An acceptor

Option B: A donor

Option C: Germanium

Option D: Silicon

Correct Answer: An acceptor ✔

Option A: low carbon steel

Option B: wrought iron

Option C: cast iron

Option D: malleable iron

Correct Answer: wrought iron ✔

A. decreases
B. increases
C. remains constant

Correct Answer: remains constant ✔

Option A: Holes can exist in certain semiconductors only

Option B: Holes can exist in any material including conductors

Option C: Holes may constitute an electric current

Option D: Holes can be considered as a net positive charge

Correct Answer: Holes can exist in any material including conductors ✔

Option A: insulator

Option B: metal

Option C: intrinsic semiconductor

Option D: none of the above

Correct Answer: metal ✔

Option A: zero

Option B: one

Option C: negative

Option D: more than one

Correct Answer: zero ✔

Option A: Age hardening

Option B: Alloying

Option C: Temperature

Option D: Cold work

Correct Answer: All of the above ✔

Option A: smoky and dirty atmosphere

Option B: humidity in the atmosphere

Option C: both (A) and (b)

Option D: neither (A) nor (b)

Correct Answer: both (A) and (b) ✔

Option A: electrons only

Option B: positive ions only

Option C: negative ions only

Option D: positive and negative ions

Correct Answer: electrons only ✔

Option A: decrease dielectric constant

Option B: decrease dielectric strength

Option C: decrease insulation resistance

Option D: increase dielectric loss

Correct Answer: all of the above ✔

Option A: large

Option B: small

Option C: nil

Option D: any of the above

Correct Answer: large ✔

Option A: non-linear conductor

Option B: reverse conductor

Option C: bad-conductor

Option D: non-conductor

Correct Answer: non-linear conductor ✔

Option A: Aluminium is more ductile and malleable than copper

Option B: Aluminium is available in plenty, cheaper and lighter than copper

Option C: Aluminium has lower resistivity than that of copper

Option D: Aluminium has less temperature co-efficient than copper

Correct Answer: Aluminium is available in plenty, cheaper and lighter than copper ✔

Option A: extrnisic

Option B: intmisic

Option C: N-type

Option D: P-type

Correct Answer: intmisic ✔

Option A: intensity

Option B: speed

Option C: frequency

Option D: wave length

Correct Answer: frequency ✔

Option A: Porcelain

Option B: Slate

Option C: Asbestos

Option D: Glass

Correct Answer: Porcelain ✔

Option A: Diamond

Option B: High speed steel

Option C: Mild steel

Option D: Cast iron

Correct Answer: Cast iron ✔

Option A: Phosphorous

Option B: Rubber

Option C: Silicon

Option D: Aluminium

Correct Answer: Silicon ✔

Option A: Both have great tendency for oxidation

Option B: Both have low melting point

Option C: Very large length of wires will be required

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Tungsten

Option B: Aluminium

Option C: Copper

Option D: Carbon

Correct Answer: Copper ✔

Option A: temperature

Option B: resistance

Option C: eddy currents

Option D: coupling co-efficient

Correct Answer: temperature ✔

Option A: positive ions only

Option B: negative ions only

Option C: positive and negative ions

Option D: electrons and holes

Correct Answer: electrons and holes ✔

Option A: Solubility

Option B: Viscosity

Option C: Porosity

Option D: Hygroscopicity

Correct Answer: Hygroscopicity ✔

Option A: insulators

Option B: conductors

Option C: semiconductors

Option D: superconductors

Correct Answer: conductors ✔

Option A: Less liability to kink

Option B: Greater flexibility

Option C: Less liability to break

Option D: All of the above

Correct Answer: All of the above ✔

Option A: copper points offer low contact resistance

Option B: copper can be easily soldered and welded

Option C: copper windings are less bulky and the machines become compact

Option D: all of the above

Correct Answer: all of the above ✔

Option A: Copper

Option B: Nichrome

Option C: Platinum

Option D: Manganin

Correct Answer: Manganin ✔

Option A: transformer, motor and generator windings

Option B: transmission and distribution lines

Option C: house wiring

Option D: all above applications

Correct Answer: all above applications ✔

Option A: Kanthal

Option B: Manganin

Option C: Nichrome

Option D: Eureka

Correct Answer: Kanthal ✔

Option A: electrical contacts

Option B: thermocouple

Option C: heating element in high temperature furnace

Option D: grids of special purpose vacuum tubes

Correct Answer: all of the above ✔

Option A: overhead telephone wire

Option B: earth wire

Option C: core wire of ACSR

Option D: all of the above

Correct Answer: all of the above ✔

Option A: Where lubrication is difficult or im-possible

Option B: Where corrosive chemical action exists

Option C: Where high temperature exists

Option D: All of the above

Correct Answer: All of the above ✔

Option A: Speed of the machine

Option B: Contact pressure

Option C: Surface conditions of brush and commutator

Option D: Excessive sparking

Correct Answer: All of the above ✔

Option A: inject more charge carriers

Option B: reduce the energy gap

Option C: increase the kinetic energy of valence electrons

Option D: all of the above

Correct Answer: reduce the energy gap ✔

Option A: easy to make

Option B: compact

Option C: inexpensive

Option D: all of the above reasons

Correct Answer: all of the above reasons ✔

Option A: Non-metal solids except carbon

Option B: Air and most other gases

Option C: Pure water and liquids in general except mercury

Option D: All of the above

Correct Answer: All of the above ✔

Option A: carbon rod serves as conductor

Option B: carbon can resist the attack of battery acid

Option C: both (A) and (B)

Option D: either (A) or (B)

Correct Answer: both (A) and (B) ✔

Option A: Silica

Option B: Germanium

Option C: Selenium

Option D: Gallium-arsenide

Correct Answer: Silica ✔

Option A: 1

Option B: 2

Option C: 4

Option D: 8

Correct Answer: 2 ✔

A. the heat content of the crystal
B. the temperature of the crystal
C. the stiffness of the bonds it makes with neighbors

Correct Answer: the stiffness of the bonds it makes with neighbors ✔

Option A: the electronic concentration and the mobility of the free electrons

Option B: the number of valence electrons per atom

Option C: either (A) or (B)

Option D: none of the above

Correct Answer: the electronic concentration and the mobility of the free electrons ✔

A. Aluminium is a noble metal
B. Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium
C. No reaction with oxygen occurs ft Any of the above

Correct Answer: Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium ✔

A. the amplitude of vibration of the atoms varies with temperature
B. the electron density varies with temperature
C. the electron gas density varies with temperature

Correct Answer: the amplitude of vibration of the atoms varies with temperature ✔

Option A: 2

Option B: 4

Option C: 7

Option D: 12

Correct Answer: 7 ✔

Option A: carbon crystals

Option B: solid carbon granules

Option C: pulverized coal

Option D: finely divided carbon black

Correct Answer: finely divided carbon black ✔

Option A: covalent

Option B: metallic

Option C: Vander Waals

Option D: Vander Waals and covalent

Correct Answer: covalent ✔

Option A: produce harmonic distortion

Option B: follows Ohm’s law at low temperatures only

Option C: result in non-uniform heating

Option D: none of the above

Correct Answer: produce harmonic distortion ✔

A. Organic polymers
B. Silicon
C. Metals

Correct Answer: Metals ✔

Option A: adding impurities

Option B: reducing temperatures

Option C: application of magnetic field

Option D: any of the above

Correct Answer: application of magnetic field ✔

Option A: Composition

Option B: Pressure

Option C: Size

Option D: Temperature

Correct Answer: Composition ✔

Option A: Tin-lead

Option B: Tin-silver-lead

Option C: Copper-zinc

Option D: None of the above

Correct Answer: Copper-zinc ✔

Option A: linear

Option B: hexagonal

Option C: orthorhombic

Option D: cubic

Correct Answer: cubic ✔

A. increases
B. decreases
C. does not change

Correct Answer: increases ✔

Option A: vacuum tubes

Option B: copper conductors

Option C: ferrite cores

Option D: transistors

Correct Answer: vacuum tubes ✔

Option A: high resistivity

Option B: high resistance to corrosion

Option C: good thermal conductivity

Option D: high melting point

Correct Answer: high resistivity ✔

Option A: Glass

Option B: Quartz

Option C: Corrundum

Option D: Neoprene

Correct Answer: Quartz ✔

Option A: resonant waves

Option B: musical waves

Option C: microwaves

Option D: ultrasonic waves

Correct Answer: ultrasonic waves ✔

Option A: Cast-iron

Option B: Graphite

Option C: Rubber

Option D: Glass

Correct Answer: Rubber ✔

Option A: copper and aluminium

Option B: tin and lead

Option C: nickel, copper and zinc

Option D: silver, copper and lead

Correct Answer: tin and lead ✔

Option A: Copper-constantan

Option B: Aluminium-tin

Option C: Silver-German silver

Option D: Iron-steel

Correct Answer: Copper-constantan ✔

Option A: GLS lamps

Option B: electric arc furnace

Option C: dry cells

Option D: cinema projectors

Correct Answer: GLS lamps ✔

Option A: Silver nitrate

Option B: Ferric oxide

Option C: Small particles of iron

Option D: Silicon-iron

Correct Answer: Ferric oxide ✔

Option A: Fe203

Option B: Si02

Option C: AI2O3

Option D: B2O3

Correct Answer: Si02 ✔

Option A: aluminium

Option B: steel

Option C: ACSR conductors

Option D: copper

Correct Answer: steel ✔

Option A: Induction hardened copper

Option B: Hard drawn copper

Option C: Pure annealed copper

Option D: Copper containing traces of silicon

Correct Answer: Pure annealed copper ✔

Option A: Carbon

Option B: Steel

Option C: Silver

Option D: Aluminium

Correct Answer: Carbon ✔

Option A: silver and tin

Option B: copper and tungsten

Option C: tungsten and silver

Option D: copper and nickel

Correct Answer: copper and nickel ✔

Option A: critical magnetic field

Option B: transition temperature

Option C: critical current density

Option D: none of the above

Correct Answer: critical current density ✔

Option A: 18.0°K

Option B: 9.22°K

Option C: 4.12°K

Option D: 1.14’K

Correct Answer: 4.12°K ✔

Option A: zero

Option B: negative real value

Option C: positive real value

Option D: complex value

Correct Answer: zero ✔

Option A: decreases

Option B: increases

Option C: remains constant

Option D: becomes temperature independent

Correct Answer: increases ✔

Option A: copper

Option B: kanthal

Option C: manganin

Option D: nichrome

Correct Answer: manganin ✔

Option A: a ceramic body having metal and caps

Option B: a wire of platinum

Option C: a heavy cross-section of copper or aluminium

Option D: a ceramic tube having carbon rod inside it

Correct Answer: a ceramic body having metal and caps ✔

Option A: electric field

Option B: magnetic field

Option C: electromagnetic field

Option D: none of the above

Correct Answer: electric field ✔

Option A: Nichrome

Option B: Constantan

Option C: Kanthal

Option D: Molybdenum

Correct Answer: Nichrome ✔

Option A: a liquid

Option B: a metal

Option C: a metal liquid

Option D: a gas

Correct Answer: a metal ✔

Option A: Resistance of the conductor

Option B: Area of the conductor section

Option C: Length of the conductor

Option D: All of the above

Correct Answer: All of the above ✔

Option A: increase

Option B: decrease

Option C: remain unchanged

Option D: any of the above

Correct Answer: increase ✔

Option A: infrared frequencies

Option B: d.c. and low frequency

Option C: a.c. and high frequency

Option D: frequencies having no effect

Correct Answer: d.c. and low frequency ✔

Option A: lowest temperature co-efficient

Option B: good mechanical strength

Option C: good corrosion resistance

Option D: easy solderable and drawable quality

Correct Answer: F. all of the above ✔

Option A: precision instruments

Option B: heating elements

Option C: motor starters

Option D: incandescent lamps

Correct Answer: all of the above ✔

Option A: magnetic field strength

Option B: temperature

Option C: either (A) or (B)

Option D: both (A) and (B)

Correct Answer: both (A) and (B) ✔

Option A: decreasing its temperature

Option B: increasing its temperature

Option C: decreasing its vibration

Option D: increasing its vibration

Correct Answer: decreasing its temperature ✔

Option A: the crystal structure having no atomic vibration at 0°K

Option B: all electrons interact in the super-conducting state

Option C: the electrons jump into nucleus at 0°K

Option D: none of the above

Correct Answer: the crystal structure having no atomic vibration at 0°K ✔

Option A: generating very strong magnetic field

Option B: manufacture of bubble memories

Option C: generating electrostatic field

Option D: generating regions free from magnetic field

Correct Answer: generating very strong magnetic field ✔

Option A: Copper

Option B: Aluminium

Option C: Steel reinforced copper

Option D: Steel reinforced aluminium

Correct Answer: Steel reinforced aluminium ✔

Option A: highest conductivity

Option B: lowest temperature co-efficient

Option C: good mechanical strength

Option D: good corrosion resistance

Correct Answer: F. all of the above ✔

Option A: 2

Option B: 4

Option C: 6

Option D: 8

Correct Answer: 6 ✔

Option A: gold

Option B: copper

Option C: aluminium

Option D: kanthal

Correct Answer: gold ✔

Option A: less than that of unbounded electron

Option B: greater than that of unbounded electron

Option C: equal to that of unbounded electron

Option D: infinite

Correct Answer: less than that of unbounded electron ✔

Option A: copper

Option B: aluminium

Option C: both (A) and (B)

Option D: copper and silver

Correct Answer: both (A) and (B) ✔

Option A: zero conductivity

Option B: unity conductivity

Option C: infinite conductivity

Option D: none of the above

Correct Answer: infinite conductivity ✔

Option A: 2n2

Option B: 4n2

Option C: 2n3

Option D: 4ns

Correct Answer: 2n2 ✔

Option A: malleability

Option B: toughness

Option C: softness

Option D: none of the above

Correct Answer: softness ✔

Option A: Proton

Option B: Neutron

Option C: Electron

Option D: None of the above

Correct Answer: Electron ✔

Option A: unit cell

Option B: space lattice

Option C: either A. or (b)

Option D: none of the above

Correct Answer: unit cell ✔

Option A: transfer of electrons between atoms

Option B: sharing of electrons between atoms

Option C: sharing of variable number of electrons by a variable number of atoms

Option D: none of the above

Correct Answer: sharing of electrons between atoms ✔