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4

Thermoplastic materials are those materials which

A. Are formed into shape under heat and pressure and results in a permanently hard product

B. Do not become hard with the application of heat and pressure and no chemical change occurs

C. Are flexible and can withstand considerable wear under suitable conditions

D. Are used as a friction lining for clutches and brakes

Correct Answer :

B. Do not become hard with the application of heat and pressure and no chemical change occurs


Related Questions

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4

Thermoplastic materials are those materials which

A. Are formed into shape under heat and pressure and results in a permanently hard product

B. Do not become hard with the application of heat and pressure and no chemical change occurs

C. Are flexible and can withstand considerable wear under suitable conditions

D. Are used as a friction lining for clutches and brakes

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4

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

A. Silicon

B. Sulphur

C. Manganese

D. Phosphorus

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Dye penetrant method is generally used to locate

A. Core defects

B. Surface defects

C. Superficial defects

D. Temporary defects

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The basic constituents of Hastelloy are

A. Aluminium, copper etc.

B. Nickel, molybdenum etc.

C. Nickel, Copper, etc.

D. All of the above

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Manganese is added in low carbon steel to

A. Make the steel tougher and harder

B. Raise the yield point

C. Make the steel ductile and of good bending qualities

D. All of the above

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Monel metal is an alloy of

A. Nickel and copper

B. Nickel and chromium

C. Nickel, Chromium and iron

D. Copper and chromium

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A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

A. Allotropic change

B. Recrystallisation

C. Heat treatment

D. Precipitation

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The hardness is the property of a material due to which it

A. Can be drawn into wires

B. Breaks with little permanent distortion

C. Can cut another metal

D. Can be rolled or hammered into thin sheets

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The coordination number of a face centred cubic space lattice is

A. Six

B. Twelve

C. Eighteen

D. Twenty

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Silicon when added to copper improves

A. Machinability

B. Hardness

C. Hardness and strength

D. Strength and ductility

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Steel with ________ carbon is known as hypo-eutectoid steel.

A. 0.8 %

B. Below 0.8 %

C. Above 0.8 %

D. None of these

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Nimonic contains __________ percentage of nickel as that of Inconel.

A. Same

B. Less

C. More

D. None of these

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A small percentage of boron is added to steel in order to

A. Increase hardenability

B. Reduce machinability

C. Increase wear resistance

D. Increase endurance strength

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Age hardening is related to

A. Duralumin

B. Brass

C. Copper

D. Silver

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Pearlite consists of

A. 13% carbon and 87% ferrite

B. 13% cementite and 87% ferrite

C. 13% ferrite and 87% cementite

D. 6.67% carbon and 93.33% iron

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The type of space lattice found in alpha-iron is

A. Face centred cubic space lattice

B. Body centred cubic space lattice

C. Close packed hexagonal space lattice

D. None of these

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Phosphor bronze contains

A. 0.5% of phosphorous

B. 1% phosphorous

C. 2.5% phosphorous

D. None of the above

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Drop forging dies contain carbon of the order of

A. 0.1 to 0.2 %

B. 0.25 to 0.5 %

C. 0.6 to 0.7 %

D. 0.7 to 0.9 %

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Which of the following steel making process is being adopted at Rourkela (in India) Steel Plant?

A. Bessemer process

B. Open hearth process

C. Electric process

D. LD process

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Vanadium in high speed steels

A. Promotes decarburisation

B. Provides high hot hardness

C. Forms very hard carbides and thus increases wear resistance

D. Promotes retention of austenite

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Tungsten 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 anticorrosion properties

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The ultimate tensile strength of low carbon steel by working at a high strain rate will

A. Decrease

B. Increase

C. Remain constant

D. First increase and then decrease

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The presence of sulphur in pig iron makes

A. It easily machinable

B. It brittle

C. It hard

D. The casting unsound

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The material widely used for making pendulums of clocks is

A. Stainless steel

B. High speed steel

C. Heat resisting steel

D. Nickel steel

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In mottled cast iron, carbon is available in

A. Free form

B. Combined form

C. Nodular form

D. Partly in free and partly in combined state

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The silicon steel is widely used for

A. Connecting rods

B. Cutting tools

C. Generators and transformers in the form of laminated cores

D. Motor car crankshafts

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Grey 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 is obtained by cooling rapidly. It is almost unmachinable

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

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

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A material is said to be allotropic, if it has

A. Fixed structure at all temperatures

B. Atoms distributed in random pattern

C. Different crystal structures at different temperatures

D. Any one of the above

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Specify the sequence correctly

A. Grain growth, recrystallisation, stress relief

B. Stress relief, grain growth, recrystallisation

C. Stress relief, recrystallisation, grain growth

D. Grain growth, stress relief, recrystallisation

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Neutral 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