Engineering Materials - Electronics Engineering test questions
(1) The variety of copper that has the best mechanical strength is (A) Soft copper
(B) Cast copper
(C) Hard drawn copper
(D) Annealed copper
View Answer / Hide AnswerANSWER: Hard drawn copper
(A) Bauxite
(B) Alum
(C) Hamaetite
(D) Galena
View Answer / Hide Answer(3) At absolute zero resistivity of copper is(A) 3.56 μ ohm-cm
(B) 2.56 μ ohm-cm
(C) 1.56 μ ohm-cm
(D) Negligibly small
View Answer / Hide Answer(4) The minimum cross-section required for an aluminium conductor to carry an electric current of 75 A is(A) 30 mm
² (B) 25 mm
² (C) 20 mm
² (D) 100 mm
² View Answer / Hide Answer(5) In case of face centered cubic lattice, the atomic radius is (A) a√
3/4(B) a√
3/5(C) a/3
(D) a/2
View Answer / Hide Answer(6) Constantan contains(A) Silver and tin
(B) Tungsten and silver
(C) Copper and nickel
(D) Copper and tungsten
View Answer / Hide AnswerANSWER: Copper and nickel
(A) Copper, zinc and nickel
(B) Silver, tin and tungsten
(C) Copper, manganese and nickel
(D) None of the above
View Answer / Hide AnswerANSWER: Copper, zinc and nickel
(A) Non conductor
(B) Non-linear conductor
(C) Reverse conductor
(D) Bad conductor
View Answer / Hide AnswerANSWER: Non-linear conductor
(A) Kelvin effect
(B) Peltier effect
(C) Seebeck effect
(D) Thomson effect
View Answer / Hide Answer(10) Which one of the following exhibits the same elastic properties in all directions?(A) Isentropic
(B) Visco elastic
(C) Isotropic
(D) Inelastic
View Answer / Hide Answer(11) _____________ is a ceramic material(A) MgO
(B) Invar
(C) Leather
(D) Nylon
View Answer / Hide Answer(12) _____________ is generally used in appliances with heating elements(A) Clad metal type of thermostat
(B) Magnetic type of thermostat
(C) Circuit breaker type of thermostat
(D) Bimetallic type of thermostat
View Answer / Hide AnswerANSWER: Bimetallic type of thermostat
(A) Highly inflammable
(B) A semiconductor
(C) Uncombustible
(D) Low resistance conductor
View Answer / Hide Answer(14) In spark plugs, insulating material used is(A) Porcelain
(B) Polysterene
(C) Rubber
(D) Mica
View Answer / Hide Answer(15) In thermocouples, the materials that are commonly used in pairs are(A) Silver – German silver
(B) Copper - constantan
(C) Aluminium - tin
(D) Iron - steel
View Answer / Hide AnswerANSWER: Copper - constantan
(A) Nearly 100
(B) More than 20
(C) Less than 1
(D) Between 1 and 10
View Answer / Hide Answer(17) The property of materials by which they can be drawn into wires is known as (A) Creep
(B) Elasticity
(C) Ductility
(D) Malleability
View Answer / Hide Answer(18) For Rohelle salt, the Curie point is about(A) 240° C
(B) 250° C
(C) 1000° C
(D) Absolute zero
View Answer / Hide Answer(19) ____________ can be used for temperatures upto 500° C.(A) Polythene
(B) Paper-oiled
(C) Empire cloth
(D) Mica
View Answer / Hide Answer(20) A small changes in dimensions occur when a ferromagnetic substance is magnetized. This phenomenon is called(A) Magnetic expansion
(B) Magnetostriction
(C) Magnetic hysteresis
(D) Magneto-calorisation
View Answer / Hide Answer(21) When 0.3% to 4.5% of silicon is added to iron then(A) It reduces the saturation magnetization
(B) It increases the hysteresis loss
(C) It increases the electrical resistivity of iron
(D) None of the above
View Answer / Hide AnswerANSWER: It increases the electrical resistivity of iron
(A) High silica glass
(B) Soda lime glass
(C) High leaded glass
(D) Boro silicate glass
View Answer / Hide Answer(23) __________________ polymer is crystalline(A) Polyvinyl chloride
(B) Polyethylene
(C) Polymethyl metacrylate
(D) Polyvinylidene chloride
View Answer / Hide Answer(24) An alloy containing 71% copper, 28% zinc and 1% tin is known as (A) Admirality brass
(B) Muntz metal
(C) Alpha brass
(D) Cartridge brass
View Answer / Hide Answer(25) Which one of the following is piezo-electric material? (A) Polysterene
(B) Corrundum
(C) Silica sand
(D) Quartz
View Answer / Hide Answer(26) Overhead telephone wires are(A) Aluminium wires
(B) ACSR conductors
(C) Steel wires
(D) Copper wires
View Answer / Hide Answer(27) The property of the best damping is found in(A) High speed steel
(B) Cast iron
(C) Diamond
(D) Mild steel
View Answer / Hide Answer(28) The ability of material to absorb a large amount of energy is(A) Resilience
(B) Toughness
(C) Ductility
(D) Malleability
View Answer / Hide Answer(29) For elastic materials stress and strain are related by(A) Dalton’s law
(B) Hooke’s law
(C) Gauss’s law
(D) Poisson’s law
View Answer / Hide Answer(30) The permeability and permittivity of a medium are(A) Related by the velocity of electromagnetic waves
(B) Related by the Boltzmann’s constant
(C) Related by atomic number
(D) Independent of each other
View Answer / Hide AnswerANSWER: Independent of each other
(A) Magnanin
(B) Almico
(C) Nichrome
(D) Graphite
View Answer / Hide Answer(32) Wear resistance of a material depends on(A) Hardness
(B) Tensile strength
(C) Poisson’s ratio
(D) Elasticity
View Answer / Hide Answer(33) Ordinary soft solders usually melt at temperatures(A) Nearly room temperatures
(B) At 0°C
(C) Below 200°C
(D) Above 300°C
View Answer / Hide Answer(34) Sulphur hexafluoride is used for (A) Synchronous motors
(B) Switch gears
(C) Dynamos
(D) DC series motors
View Answer / Hide Answer (35) The property that has lower value for copper as compared to aluminium is(A) Melting point
(B) Resistivity
(C) Specific gravity
(D) All of the above
View Answer / Hide Answer(36) In case of BCC crystals the packing fraction is(A) 0.74
(B) 0.93
(C) 0.56
(D) 0.68
View Answer / Hide Answer(37) Which of the following is the unique characteristic possessed by a perfect black body?(A) A good radiator
(B) A good absorber
(C) Neither a good radiator nor a good absorber
(D) A good absorber and a good radiator
View Answer / Hide Answer(38) When two metals that have different expansion coefficients are rolled together into strips, the composite product is known as(A) Clad metal
(B) Cold rolled metal
(C) Bimetal
(D) Eutectic
View Answer / Hide Answer(39) Find the odd one out(A) Polyster
(B) Acetal
(C) Nylon
(D) Polyurethane
View Answer / Hide Answer(40) The atomic number of the element whose outermost electrons fill 3 – p sub-shells will be(A) 20
(B) 16
(C) 24
(D) 18
View Answer / Hide Answer(41) As temperature is lowered, the resistivity of all normal metals (A) Tends to a constant value
(B) At first decreases and then increases
(C) Tends to zero
(D) At first increases and then decreases
View Answer / Hide Answer(42) Consider two iron pieces A and B at temperatures T1 and T2 respectively. When placed in dark, A appears red and B appears yellow. The relation between temperatures T1 and T2 is given by(A) T1
(B) T1(C) T1=T2
(D) None of the above
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(43) Figure of merit is used to
(A) Measure the extent of doping of intrinsic semiconductors
(B) Compare the efficiency of thermoelectric materials
(C) Compare the extent of purity of semiconductor materials
(D) All of the above
View Answer / Hide Answer
ANSWER: Compare the efficiency of thermoelectric materials
(44) In solid argon, the type of bonding that exists is
(A) Vander Waals
(B) Ionic
(C) Covalent
(D) Mixture of covalent and Vander Waals
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(45) The ruby rod used for lasers is made of
(A) Aluminium oxide
(B) Germanium
(C) Copper
(D) Silica
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(46) _______________ method can be used for thermoplastic materials
(A) Compression moulding
(B) Casting
(C) Blow moulding
(D) Calendering
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(47) For face centered cube, the atomic packing factor is
(A) 0.14
(B) 0.74
(C) 0.66
(D) 0.54
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(48) Charpy test is associated with
(A) Brittleness
(B) Hardness
(C) Wire drawing
(D) Malleability
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(49) Cadmium is added to copper primarily to
(A) Reduce cost
(B) Increase mechanical strength
(C) Improve resistivity
(D) None of the above
View Answer / Hide Answer
ANSWER: Increase mechanical strength
(50) Rutile is
(A) Crystal with three equal axes not at right angles
(B) A discrete unit of energy
(C) Most common phase of TiO2
(D) Polymeric material
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ANSWER: Most common phase of TiO2
(51) For Brinell hardness test
(A) A ball of 1.587 mm is used
(B) A ball of 10 mm diameter is used
(C) A diamond cone of 120° is used
(D) A diamond cone of 136° is used
View Answer / Hide Answer
ANSWER: A ball of 10 mm diameter is used
