Online Mechanical Engineering Test - Engineering Materials Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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The electric process of steel making is especially adopted to

alloy and carbon tool steel

magnet steel

high speed tool steel

all of these

[#]

Crystal structure of a material is, generally, examined by

naked eye

optical microscope

metallurgical microscope

X-ray techniques

[#]

The iron ore in the charge of blast furnace acts as an iron bearing mineral.

True

False

[#]

Which of the following display properties similar to that of steel?

Blackheart cast iron

Whiteheart cast iron

both (a) and (b)

none of these

[#]

Which of the following is an amorphous material?

Mica

Silver

Lead

Glass

[#]

Which of the following statement is true about brittle fracture?

High temperature and low strain rates favour brittle fracture

Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

Brittle fracture is always preceded by noise

Cup and cone formation is characteristic for brittle materials

[#]

In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air.

True

False

[#]

Martensite has needle like structure and is magnetic.

Correct

Incorrect

[#]

Induction hardening is basically a

carburising process

surface hardening process

core-hardening process

none of these

[#]

10.

The charge of the blast furnace consists of

calcined ore (8 parts ), coke (4 parts) and limestone (1 part)

calcined ore (4 parts), coke (1 part) and limestone (8 parts)

calcined ore (1 part), coke (8 part) and limestone (4 parts)

calcined ore, coke and limestone all in equal parts

[#]

11.

A steel containing ferrite and pearlite is

hard

soft

tough

hard and tough

[#]

12.

Which of the following metal is used for nuclear energy?

Uranium

Thorium

Niobium

all of these

[#]

13.

The maximum internal diameter of a blast furnace is about

3 m

6 m

9 m

12 m

[#]

14.

When a low carbon steel is heated upto lower critical temperature,

there is no change in grain size

the average grain size is a minimum

the grain size increases very rapidly

the grain size first increases and then decreases very rapidly

[#]

15.

Beryllium bronze contains

60% copper and 40% beryllium

80% copper and 20% beryllium

97.75% copper and 2.25% beryllium

99% copper and 1% beryllium

[#]

16.

In the austempering process of heat treatment, austenite changes into

martensite

troostite

sorbite

bainite

[#]

17.

The addition of manganese to aluminium improves corrosion resistance.

Correct

Incorrect

[#]

18.

The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is

elasticity

plasticity

ductility

malleability

[#]

19.

Steel containing 0.8 to 1.5% carbon, is known as

mild steel

dead mild steel

medium carbon steel

high carbon steel

[#]

20.

Which of the following is a point imperfection?

Vacancy

Interstitial imperfection

Frenkel imperfection

all of these

[#]

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Online Mechanical Engineering Test - Engineering Materials Test

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