_ When the steel is normalized, its$?

Ultimate tensile strength increases

_ Acidic solution is one which has pH value$?

pH value has nothing to do with neutral solution

_ Which of the following represents the allotropic forms of iron?$?

Alpha iron, beta iron and gamma iron

Body centered cubic iron and face centered cubic iron

Alpha iron, gamma from and delta iron

_ Which is false statement about properties of aluminium?$?

Modulus of elasticity is fairly low

Creep strength limits its use to fairly low temperatures

_ For a steel containing 0.8% carbon$?

There is only one critical point

There can be any number of critical points

_ Stress relaxation is the phenomenon$?

Stress reduces on increasing load

In which stress remains constant on increasing load

In which deformation tends to loosen the joint and produces a stress reduced

Stress reduces on increasing load

_ Chilled cast iron has$?

A very high percentage of graphite

Graphite as its basic constituent of composition

__Aluminium bronze contains__

90% magnesium and 9% aluminium with some copper

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

92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg

90% magnesium and 9% aluminium with some copper

__Addition of copper to aluminium results in__

Improvement of casting characteristics

Improvement of corrosion resistance

One of the best known age and precipitation hardening systems

__Combined carbon in iron makes the metal__

Soft and gives coarse grained crystalline structure

Soft and gives a fine grained crystalline structure

Hard and gives a coarse grained crystalline structure

Hard and gives a fine grained crystalline structure

__Process of Austempering results in__

Lamellar layers of carbide distributed throughout the structure

Improves wear resistance, cutting ability and toughness

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves cutting ability and reduces hardenability

Gives ductility, toughness, tensile strength and anti-corrosion properties

__Dow metal contains__

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

92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

90% magnesium and 9% aluminium with some copper

__The usual composition of a soldering alloy is__

Tin, lead and small percentage of antimony

__For the allotropic forms of iron, the points of arrest are__

The points where no further change occurs

The points where there is no further flow of metal

Is produced by annealing process. It is soft, tough and easily machined metal

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

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

Is produced by annealing process. It is soft, tough and easily machined metal

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

Nickel and iron alloy having high permeability

__Monel metal contains__

88% copper and 10% tin and rest zinc

63 to 67% nickel and 30% copper

88% copper and 10% tin and rest zinc

_Malleability of a material can be defined as$?

Ability to recover its original form

Ability to undergo large permanent deformations in compression

Ability to recover its original form

Ability to undergo large permanent deformations in tension

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

Extensively used for making cutting tools

An alloy of iron and carbon with varying quantities of phosphorus and sulphur

Extensively used for making cutting tools

_Delta iron occurs at temperature of$?

Between 910¬¨‚àûC and 1400¬¨‚àûC

Between 1400¬¨‚àûC and 1539¬¨‚àûC

Between 910¬¨‚àûC and 1400¬¨‚àûC

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

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

Is produced by annealing process. It is soft, tough and easily machined metal

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

_A material is said to be allotropic, if it has$?

Fixed structure at all temperatures

Atoms distributed in random pattern

Different crystal structures at different temperatures

_The temperature required for full annealing in hypereutectoid steel is$?

30¬¨‚àû C to 50¬¨‚àû C below lower critical temperature

30¬¨‚àû C to 50¬¨‚àû C above upper critical temperature

30¬¨‚àû C to 50¬¨‚àû C below upper critical temperature

30¬¨‚àû C to 50¬¨‚àû C above lower critical temperature

30¬¨‚àû C to 50¬¨‚àû C below lower critical temperature

Decreases tensile strength and hardness

Lowers the toughness and transverse ductility

482 + Mcqs in Engineering Materials Page 7 McqOptions

301.	_ Blast furnace is used to produce$?
A.	Pig iron
B.	Cast iron
C.	Wrought iron
D.	Steel
Answer» B. Cast iron

302.	_ When the steel is normalized, its$?
A.	Yield point increases
B.	Ductility decreases
C.	Ultimate tensile strength increases
D.	All of these
Answer» E.

303.	_ Brass is an alloy of$?
A.	Copper and zinc
B.	Copper and tin
C.	Copper, tin and zinc
D.	None of these
Answer» B. Copper and tin

304.	_ Which of the following impurity in cast iron makes it hard and brittle?$?
A.	Silicon
B.	Sulphur
C.	Manganese
D.	Phosphorus
Answer» C. Manganese

305.	_ Acidic solution is one which has pH value$?
A.	Greater than 7
B.	Less than 7
C.	Equal to 7
D.	pH value has nothing to do with neutral solution
Answer» C. Equal to 7

306.	_ Which of the following represents the allotropic forms of iron?$?
A.	Alpha iron, beta iron and gamma iron
B.	Alpha iron and beta iron
C.	Body centered cubic iron and face centered cubic iron
D.	Alpha iron, gamma from and delta iron
Answer» E.

307.	_ Which is false statement about properties of aluminium?$?
A.	Modulus of elasticity is fairly low
B.	Wear resistance is very good
C.	Fatigue strength is not high
D.	Creep strength limits its use to fairly low temperatures
Answer» C. Fatigue strength is not high

308.	_ For a steel containing 0.8% carbon$?
A.	There is no critical point
B.	There is only one critical point
C.	There are two critical points
D.	There can be any number of critical points
Answer» C. There are two critical points

309.	_ Stress relaxation is the phenomenon$?
A.	In which parts are not loaded
B.	In which stress remains constant on increasing load
C.	In which deformation tends to loosen the joint and produces a stress reduced
D.	Stress reduces on increasing load
Answer» D. Stress reduces on increasing load

310.	_ When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.$?
A.	Equal to
B.	Less than
C.	More than
D.	None of these
Answer» C. More than

311.	_ Chilled cast iron has$?
A.	No graphite
B.	A very high percentage of graphite
C.	A low percentage of graphite
D.	Graphite as its basic constituent of composition
Answer» B. A very high percentage of graphite

312.	__The property of a material which enables it to retain the deformation permanently, is called__
A.	Brittleness
B.	Ductility
C.	Malleability
D.	Plasticity
Answer» E.

315.	__The hardness and tensile strength in austenitic stainless steel can be increased by__
A.	Hardening and cold working
B.	Normalizing
C.	Martempering
D.	Full annealing
Answer» B. Normalizing

318.	__An example of amorphous material is__
A.	Zinc
B.	Lead
C.	Silver
D.	Glass
Answer» E.

327.	__Nodular iron has__
A.	High machinability
B.	Low melting point
C.	High tensile strength
D.	All of the above
Answer» E.

313.	__Aluminium bronze contains__
A.	94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B.	92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
C.	10% aluminium and 90% copper
D.	90% magnesium and 9% aluminium with some copper
Answer» D. 90% magnesium and 9% aluminium with some copper

314.	__Addition of copper to aluminium results in__
A.	Improvement of casting characteristics
B.	Improvement of corrosion resistance
C.	One of the best known age and precipitation hardening systems
D.	Improving machinability
Answer» D. Improving machinability

316.	__Combined carbon in iron makes the metal__
A.	Soft and gives coarse grained crystalline structure
B.	Soft and gives a fine grained crystalline structure
C.	Hard and gives a coarse grained crystalline structure
D.	Hard and gives a fine grained crystalline structure
Answer» E.

317.	__Which of the following metal is used for nuclear energy?__
A.	Uranium
B.	Thorium
C.	Niobium
D.	All of these
Answer» E.

319.	__Process of Austempering results in__
A.	Formation of bainite structure
B.	Carburised structure
C.	Martenistic structure
D.	Lamellar layers of carbide distributed throughout the structure
Answer» B. Carburised structure

320.	__Nickel in steel__
A.	Improves wear resistance, cutting ability and toughness
B.	Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C.	Improves cutting ability and reduces hardenability
D.	Gives ductility, toughness, tensile strength and anti-corrosion properties
Answer» E.

321.	__Dow metal contains__
A.	94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B.	92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
C.	90% aluminium and 90% copper
D.	90% magnesium and 9% aluminium with some copper
Answer» E.

322.	__White cast iron contains carbon in the form of__
A.	Free carbon
B.	Graphite
C.	Cementite
D.	White carbon
Answer» D. White carbon

323.	__The usual composition of a soldering alloy is__
A.	Tin, lead and small percentage of antimony
B.	Tin and lead
C.	Tin, lead and silver
D.	Tin and copper
Answer» B. Tin and lead

324.	__For the allotropic forms of iron, the points of arrest are__
A.	The points where no further change occurs
B.	Constant for all metals
C.	The points where there is no further flow of metal
D.	The points of discontinuity
Answer» E.

Explore topic-wise MCQs in Mechanical Engineering.

_ Blast furnace is used to produce$?

_ When the steel is normalized, its$?

_ Brass is an alloy of$?

_ Which of the following impurity in cast iron makes it hard and brittle?$?

_ Acidic solution is one which has pH value$?

_ Which of the following represents the allotropic forms of iron?$?

_ Which is false statement about properties of aluminium?$?

_ For a steel containing 0.8% carbon$?

_ Stress relaxation is the phenomenon$?

_ When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.$?

_ Chilled cast iron has$?

__The property of a material which enables it to retain the deformation permanently, is called__

__Aluminium bronze contains__

__Addition of copper to aluminium results in__

__The hardness and tensile strength in austenitic stainless steel can be increased by__

__Combined carbon in iron makes the metal__

__Which of the following metal is used for nuclear energy?__

__An example of amorphous material is__

__Process of Austempering results in__

__Nickel in steel__

__Dow metal contains__

__White cast iron contains carbon in the form of__

__The usual composition of a soldering alloy is__

__For the allotropic forms of iron, the points of arrest are__

__White cast iron__

__Permalloy is a__

__Nodular iron has__

__Monel metal contains__

__Balls for ball bearings are made of__

__The material widely used for making pendulums of clocks is__

_The percentage of carbon in low carbon steel is$?

_Malleability of a material can be defined as$?

_Brass contains$?

_Carbon steel is$?

_The defect which takes place due to imperfect packing of atoms during crystallization is known as$?

_Delta iron occurs at temperature of$?

_Shock resistance of steel is increased by adding$?

_A cold chisel is made of$?

_Ductile cast iron$?

_In high speed steels, manganese is used to tougher the metal and to increase its$?

_When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of$?

_The cupola is used to manufacture$?

_Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio$?

_By severely deforming a metal in a particular direction it becomes$?

_Foundry crucible is made of$?

_A material is said to be allotropic, if it has$?

_The temperature required for full annealing in hypereutectoid steel is$?

_Sulphur in steel$?

_Hardness of lower bainite (tempered martensite) is about$?

_Which of the following has a fine gold colour and is used for imitation jewellery?$?

The property of a material which enables it to retain the deformation permanently, is called

Aluminium bronze contains

Addition of copper to aluminium results in

The hardness and tensile strength in austenitic stainless steel can be increased by

Combined carbon in iron makes the metal

Which of the following metal is used for nuclear energy?

An example of amorphous material is

Process of Austempering results in

Nickel in steel

Dow metal contains

White cast iron contains carbon in the form of

The usual composition of a soldering alloy is

For the allotropic forms of iron, the points of arrest are

White cast iron

Permalloy is a

Nodular iron has

Monel metal contains

Balls for ball bearings are made of

The material widely used for making pendulums of clocks is

325.	__White cast iron__
A.	Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
B.	Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C.	Is produced by annealing process. It is soft, tough and easily machined metal
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
Answer» C. Is produced by annealing process. It is soft, tough and easily machined metal

326.	__Permalloy is a__
A.	Kind of stainless steel
B.	None ferrous alloy
C.	Polymer
D.	Nickel and iron alloy having high permeability
Answer» E.

328.	__Monel metal contains__
A.	63 to 67% nickel and 30% copper
B.	88% copper and 10% tin and rest zinc
C.	Alloy of tin, lead and cadmium
D.	Malleable iron and zinc
Answer» B. 88% copper and 10% tin and rest zinc

329.	__Balls for ball bearings are made of__
A.	Cast iron
B.	Mild steel
C.	Stainless steel
D.	Carbon-chrome steel
Answer» E.

330.	__The material widely used for making pendulums of clocks is__
A.	Stainless steel
B.	High speed steel
C.	Heat resisting steel
D.	Nickel steel
Answer» E.

331.	_The percentage of carbon in low carbon steel is$?
A.	0.05%
B.	0.15%
C.	0.3%
D.	0.5%
Answer» C. 0.3%

332.	_Malleability of a material can be defined as$?
A.	Ability to undergo large permanent deformations in compression
B.	Ability to recover its original form
C.	Ability to undergo large permanent deformations in tension
D.	All of the above
Answer» B. Ability to recover its original form

333.	_Brass contains$?
A.	70% copper and 30% zinc
B.	90% copper and 10% tin
C.	85 - 92% copper and rest tin with little lead and nickel
D.	70 - 75% copper and rest tin
Answer» B. 90% copper and 10% tin

334.	_Carbon steel is$?
A.	Made by adding carbon in steel
B.	Refined from cast iron
C.	An alloy of iron and carbon with varying quantities of phosphorus and sulphur
D.	Extensively used for making cutting tools
Answer» D. Extensively used for making cutting tools

335.	_The defect which takes place due to imperfect packing of atoms during crystallization is known as$?
A.	Line defect
B.	Surface defect
C.	Point defect
D.	None of these
Answer» D. None of these