Mechanical Engineering MCQs

Option A: 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

Option B: 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

Option C: 90% aluminium and 90% copper

Option D: 90% magnesium and 9% aluminium with some copper

Correct Answer: 90% magnesium and 9% aluminium with some copper ✔

Option A: stainless steel

Option B: gun metal

Option C: german silver

Option D: duralumin

Correct Answer: duralumin ✔

Option A: lead base alloy

Option B: tin base alloy

Option C: copper base alloy

Option D: all of the above

Correct Answer: E. A. and C. above ✔

Option A: greater than 7

Option B: less than 7

Option C: equal to 7

Option D: pH value has nothing to do with neutral solution

Correct Answer: less than 7 ✔

Option A: gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt

Option B: Mg, Zn, Ti, Zr, Br, Cd

Option C: a iron (below 910°C and between 1400 to 1539°C), W

Option D: all of the above

Correct Answer: gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt ✔

Option A: silver

Option B: gold

Option C: copper

Option D: germanium

Correct Answer: germanium ✔

Option A: ferrite and cementite

Option B: cementite and gamma iron

Option C: ferrite and austenite

Option D: ferrite and iron graphite

Correct Answer: ferrite and cementite ✔

Option A: cast iron

Option B: vitrified clay

Option C: asbestos cement

Option D: concrete

Correct Answer: cast iron ✔

Option A: ferrite and cementite

Option B: cementite and gamma iron

Option C: ferrite and austenite

Option D: ferrite and iron graphite

Correct Answer: cementite and gamma iron ✔

Option A: purification of metal

Option B: grain refinement

Option C: working at lower temperature

Option D: all of the above

Correct Answer: all of the above ✔

Option A: greater than 7

Option B: equal to 7

Option C: less than 7

Option D: pH value has nothing to do with basic solution

Correct Answer: greater than 7 ✔

Option A: greater than 7

Option B: less than 7

Option C: equal to 7

Option D: pH value has nothing to do with neutral solution

Correct Answer: equal to 7 ✔

Option A: 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi

Option B: 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg

Option C: 87% Sn, 4% Cu, 8% Sb, 1% Al

Option D: 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

Correct Answer: 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi ✔

Option A: 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

Option B: 92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

Option C: 10% aluminium and 90% copper

Option D: 90% magnesium and 9% aluminium with some copper

Correct Answer: 10% aluminium and 90% copper ✔

Option A: mild steel

Option B: german silver

Option C: lead

Option D: cast iron

Correct Answer: graphite ✔

Option A: magnesium alloys

Option B: titanium alloys

Option C: chromium alloys

Option D: magnetic steel alloys

Correct Answer: titanium alloys ✔

Option A: 63 to 67% nickel and 30% copper

Option B: 88% copper and 10% tin and rest zinc

Option C: alloy of tin, lead and cadmium

Option D: silver and chromium

Correct Answer: alloy of tin, lead and cadmium ✔

Option A: improvement of casting characteristics

Option B: improvement of corrosion resistance

Option C: one of the best known age and precipitation-hardening systems

Option D: improving machinability

Correct Answer: improvement of casting characteristics ✔

Option A: delta metal

Option B: monel metal

Option C: constantan

Option D: nichrome

Correct Answer: nichrome ✔

Option A: improvement of casting characteristics

Option B: improvement of corrosion resistance

Option C: one of the best known age and precipitation-hardening systems

Option D: improving machinability

Correct Answer: improvement of corrosion resistance ✔

Option A: modulus of elasticity is fairly low

Option B: wear resistance is very good

Option C: fatigue strength is not high

Option D: creep strength limits its use to fairly low temperatures

Correct Answer: wear resistance is very good ✔

Option A: 63 to 67% nickel and 30% copper

Option B: 88% copper, 10% tin and rest zinc

Option C: alloy of tin, lead and cadmium

Option D: iron scrap and zinc

Correct Answer: 88% copper, 10% tin and rest zinc ✔

Option A: are used where ease in machining is the criterion

Option B: contain carbon in free form

Option C: require least cutting force

Option D: do not exist

Correct Answer: are used where ease in machining is the criterion ✔

Option A: kind of stainless steel

Option B: none ferrous alloy

Option C: polymer

Option D: cutting tool material

Correct Answer: nickel and iron alloy having high permeability ✔

Option A: nichrome

Option B: invar

Option C: magnin

Option D: elinvar

Correct Answer: nichrome ✔

Option A: 70% copper and 30% zinc

Option B: 90% copper and 10% tin

Option C: 85-92% copper and rest tin with little lead and nickel

Option D: 70-78% copper and rest tin

Correct Answer: 85-92% copper and rest tin with little lead and nickel ✔

Option A: 70% copper and 30% zinc

Option B: 90% copper and 10% tin

Option C: 85-92% copper and rest tin with little lead and nickel

Option D: 70-75% copper and rest tin

Correct Answer: 90% copper and 10% tin ✔

Option A: nickel, chromium and manganese

Option B: tungsten, molybdenum and phosphorous

Option C: lead, tin, aluminium

Option D: zinc, sulphur, and chromium

Correct Answer: nickel, chromium and manganese ✔

Option A: gun metal

Option B: bronze

Option C: bell metal

Option D: babbit metal

Correct Answer: babbit metal ✔

Option A: acidic

Option B: basic

Option C: neutral

Option D: brittle

Correct Answer: neutral ✔

Option A: steel

Option B: A1203

Option C: Si02

Option D: MgO

Correct Answer: A1203 ✔

Option A: contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

Option B: is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Option C: is produced by annealing process. It is soft, tough and easily machined metal

Option D: is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Correct Answer: is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material ✔

Option A: 50 : 50

Option B: 30 : 70

Option C: 70 : 30

Option D: 40 : 60

Correct Answer: 30 : 70 ✔

Option A: 50 : 20 : 20 : 10

Option B: 40 : 30 : 20 : 10

Option C: 50 : 20 : 10 : 20

Option D: 30 : 20 : 30 : 20

Correct Answer: 50 : 20 : 20 : 10 ✔

Option A: chromium and nickel

Option B: nickel and molybdenum

Option C: aluminium and zinc

Option D: tungsten and sulfur

Correct Answer: chromium and nickel ✔

Option A: tin, lead and small percentage of antimony

Option B: tin and lead

Option C: tin, lead and silver

Option D: tin and copper

Correct Answer: tin, lead and small percentage of antimony ✔

Option A: F.C.C.

Option B: B.C.C.

Option C: H.C.P.

Option D: Orthorhombic crystalline structure

Correct Answer: F.C.C. ✔

Option A: B.C.C. crystalline structure

Option B: F.C.C. crystal structure

Option C: H.C.P. structure

Option D: a complex cubic structure

Correct Answer: B. F.C.C. crystal structure ✔

Option A: 70% copper and 30% zinc

Option B: 90% copper and 10% tin

Option C: 85-92% copper and rest tin with little lead and nickel

Option D: 70-75% copper and rest tin

Correct Answer: 70% copper and 30% zinc ✔

Option A: brittle

Option B: hard

Option C: ductile

Option D: tough

Correct Answer: brittle ✔

Option A: copper

Option B: brass

Option C: lead

Option D: silver

Correct Answer: brass ✔

Option A: silver, copper, zinc

Option B: silver, tin, nickel

Option C: silver, lead, zinc

Option D: silver, copper, aluminium

Correct Answer: silver, copper, zinc ✔

Option A: %age of carbon

Option B: %age of alloying elements

Option C: heat treatment employed

Option D: method of manufacture

Correct Answer: shape of carbides and their distribution in iron ✔

Option A: contains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

Option B: is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Option C: is produced by annealing process. It is soft, tough, and easily machined metal

Option D: is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material

Correct Answer: is produced by annealing process. It is soft, tough, and easily machined metal ✔

Option A: improves wear resistance, cutting ability and toughness

Option B: refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Option C: improves cutting ability and reduces hardenability

Option D: gives ductility, toughness, tensile strength and anticorrosion properties

Correct Answer: refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties ✔

Option A: shot peening

Option B: nitriding of surface

Option C: cold working

Option D: surface decarburisation

Correct Answer: surface decarburisation ✔

Option A: brass

Option B: mild steel

Option C: cast iron

Option D: wrought iron

Correct Answer: wrought iron ✔

Option A: 0.1 to 0.3%

Option B: 0.3 to 0.6%

Option C: 0.6 to 0.8%

Option D: 0.8 to 1.5%

Correct Answer: 0.8 to 1.5% ✔

Option A: 0.05%

Option B: 0.15%

Option C: 0.3%

Option D: 0.5%

Correct Answer: 0.15% ✔

Option A: contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

Option B: is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable

Option C: is produced by annealing process. I is soft, tough and easily machinec metal

Option D: is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material

Correct Answer: contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron ✔

Option A: improves wear resistance, cutting ability and toughness

Option B: refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant proper¬ties

Option C: improves cutting ability and reduces hardenability

Option D: gives ductility, toughness, tensile strength and anticorrosion properties

Correct Answer: gives ductility, toughness, tensile strength and anticorrosion properties ✔

Option A: it easily machinable

Option B: it brittle

Option C: it hard

Option D: the casting unsound

Correct Answer: the casting unsound ✔

Option A: 3- 5

Option B: 5-7

Option C: 7-10

Option D: 10-15

Correct Answer: 5-7 ✔

Option A: cast iron

Option B: pig iron

Option C: wrought iron

Option D: malleable iron

Correct Answer: cast iron ✔

Option A: manganese

Option B: magnesium

Option C: nickel

Option D: silicon

Correct Answer: magnesium ✔

Option A: contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

Option B: is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Option C: is produced by annealing process. It is soft, tough and easily machined metal

Option D: is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Correct Answer: is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable ✔

Option A: cold rolled steel

Option B: hot rolled steel

Option C: forged steel

Option D: cast steel

Correct Answer: cold rolled steel ✔

Option A: 0.2%

Option B: 0.5%

Option C: 0.8%

Option D: 1.0%

Correct Answer: 1.0% ✔

Option A: 0.1 to 0.2%

Option B: 0.25 to 0.5%

Option C: 0.6 to 0.7%

Option D: 0.7 to 0.9%

Correct Answer: 0.6 to 0.7% ✔

Option A: along the lines of slag distribution

Option B: perpendicular to lines of slag distribution

Option C: uniform in all directions

Option D: unpredictable

Correct Answer: along the lines of slag distribution ✔

Option A: cast iron

Option B: high speed steel

Option C: all non-ferrous materials

Option D: all of the above

Correct Answer: cast iron ✔

Option A: cast iron

Option B: mild steel

Option C: stainless steel

Option D: carbon-chrome steel

Correct Answer: carbon-chrome steel ✔

Option A: high resistance to rusting and corrosion

Option B: high ductility

Option C: ability of hold protective coating

Option D: easily weldable characteristics

Correct Answer: uniform strength in all directions ✔

Option A: below 0.5%

Option B: below 1%

Option C: above 1%

Option D: above 2.2%

Correct Answer: above 1% ✔

Option A: 0.05 to 0.20%

Option B: 0.20 to 0.45%

Option C: 0.45 to 0.55%

Option D: 0.55 to 1.0%

Correct Answer: 0.45 to 0.55% ✔

Option A: 0.1%

Option B: 0.2%

Option C: 0.4%

Option D: 0.6%

Correct Answer: 0.1% ✔

Option A: carbon

Option B: sulphur

Option C: silicon

Option D: manganese

Correct Answer: silicon ✔

Option A: silicon and sulphur

Option B: phosphorous, lead and sulphur

Option C: sulphur, graphite and aluminium

Option D: phosphorous and aluminium

Correct Answer: phosphorous, lead and sulphur ✔

Option A: cast iron

Option B: pig iron

Option C: wrought iron

Option D: malleable iron

Correct Answer: pig iron ✔

Option A: 1539°C

Option B: 1601°C

Option C: 1489°C

Option D: 1712°C

Correct Answer: 1539°C ✔

Option A: copper

Option B: chromium

Option C: nickel

Option D: silicon

Correct Answer: copper ✔

Option A: high maehinability

Option B: low melting point

Option C: high tensile strength

Option D: good fluidity

Correct Answer: all of the above ✔

Option A: austenite

Option B: martensite

Option C: pearlite

Option D: cementite

Correct Answer: martensite ✔

Option A: improves wear resistance, cuttinability and toughness

Option B: refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties

Option C: improves cutting ability and reduce hardenability

Option D: gives ductility, toughness, tensile strength and anti corrosion property:

Correct Answer: improves cutting ability and reduce hardenability ✔

Option A: adding carbon up to 2.8%

Option B: adding carbon up to 6.3%

Option C: adding carbon up to 0.83%

Option D: adding small quantities of copper

Correct Answer: adding carbon up to 0.83% ✔

Option A: aluminium

Option B: low carbon steel

Option C: medium carbon steel

Option D: high carbon steel

Correct Answer: medium carbon steel ✔

Option A: hot hardness

Option B: toughness

Option C: wear resistance

Option D: sharp cutting edge

Correct Answer: hot hardness ✔

Option A: acts as deoxidiser

Option B: reduces the grain size

Option C: decreases tensile strength and hardness

Option D: lowers the toughness and transverse ductility

Correct Answer: lowers the toughness and transverse ductility ✔

Option A: decrease

Option B: increase

Option C: remain constant

Option D: first increase and then decrease

Correct Answer: increase ✔

Option A: ability to undergo large permanent deformations in compression

Option B: ability to recover its original form

Option C: ability to undergo large permanent deformations in tension

Option D: all of the above

Correct Answer: ability to undergo large permanent deformations in tension ✔

Option A: by forming a bulge (l>) by shearing along oblique plane

Option B: in direction perpendicular to application of load

Option C: by crushing into thousands of pieces

Option D: none of the above

Correct Answer: by forming a bulge (l>) by shearing along oblique plane ✔

Option A: creep

Option B: fatigue

Option C: endurance

Option D: plastic deformation

Correct Answer: creep ✔

Option A: 1010

Option B: TO16

Option C: 1022

Option D: 1040

Correct Answer: 1022 ✔

Option A: linear

Option B: non-linear

Option C: plastic

Option D: no fixed relationship

Correct Answer: linear ✔

Option A: at which crystals first start forming from molten metal when it is cooled

Option B: at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated

Option C: at which change of allotropic form takes place

Option D: at which crystals grow bigger in size

Correct Answer: at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated ✔

Option A: room temperature

Option B: above melting point

Option C: between 1400°C and 1539°C

Option D: between 910°C and 1400°C

Correct Answer: between 1400°C and 1539°C ✔

Option A: below 10°K

Option B: above 100°K

Option C: around 0°C

Option D: around 100°C

Correct Answer: below 10°K ✔

Option A: alpha iron, beta iron and gamma iron

Option B: alpha iron and beta iron

Option C: body centred cubic a-iron and face centred cubic a-iron

Option D: alpha iron, gamma from and delta iron

Correct Answer: alpha iron, gamma from and delta iron ✔

Option A: room temperature

Option B: near melting point

Option C: between 1400°C and 1539°C

Option D: between 910°C and 1400°C

Correct Answer: between 910°C and 1400°C ✔

Option A: ferrite

Option B: pearlite

Option C: anstenite

Option D: ferrite and cementite

Correct Answer: ferrite ✔

Option A: 0.2%

Option B: 0.8%

Option C: 1.3%

Option D: 2%

Correct Answer: 2% ✔

Option A: in a random manner

Option B: in a haphazard way

Option C: in circular motion

Option D: back and forth like tiny pendulums

Correct Answer: back and forth like tiny pendulums ✔

Option A: 770°C

Option B: 910°C

Option C: 1440°C

Option D: 1539°C

Correct Answer: 910°C ✔

Option A: body centred cubic

Option B: face centred cubic

Option C: hexagonal close packed

Option D: cubic structure

Correct Answer: face centred cubic ✔

Option A: body centred cubic

Option B: face centred cubic

Option C: hexagonal close packed

Option D: cubic structure

Correct Answer: body centred cubic ✔

Option A: 0.1 to 1.2%

Option B: 1.5 to 2.5%

Option C: 2.5 to 4%

Option D: 4 to 4.5%

Correct Answer: 4 to 4.5% ✔

Option A: raw material for blast furnace

Option B: product of blast furnace made by reduction of iron ore

Option C: iron containing huge quantities of carbon

Option D: iron in molten form in the ladles

Correct Answer: product of blast furnace made by reduction of iron ore ✔

Option A: cementite

Option B: free carbon

Option C: flakes

Option D: spheroids

Correct Answer: spheroids ✔

Option A: hard

Option B: high in strength

Option C: highly resistant to corrosion

Option D: heat treated to change its properties

Correct Answer: highly resistant to corrosion ✔

Option A: It contains carbon of the order of 0 to 0.25%

Option B: It melts at 1535°C

Option C: It is very soft and ductile

Option D: It can be easily forge welded

Correct Answer: It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling ✔