Engineering Materials MCQ Questions & Answers

51

The portion of the blast furnace below its widest cross-section is called

A) Hearth B) Stack C) Bosh D) Throat

Discuss

Answer & Solution

Answer: Option C

Solution:

The portion of the blast furnace below its widest cross-section is called Bosh

52

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

Discuss

Answer & Solution

Answer: Option C

Solution:

The silicon steel is widely used for Generators and transformers in the form of laminated cores

53

Connecting rod is usually made of

A) Aluminium B) Low carbon steel C) Medium carbon steel D) High carbon steel

Discuss

Answer & Solution

Answer: Option C

Solution:

Generally rod are made of steel because of ability to absorb high impact at the expense of durability and also for lightness of steel.

54

Blast furnace is used to produce

A) Pig iron B) Cast iron C) Wrought iron D) Steel

Discuss

Answer & Solution

Answer: Option A

Solution:

Blast furnace is used to produce Pig iron

55

Compressive strength of grey cast iron in tonnes/cm is of the order of

A) 35 B) 57 C) 710 D) 1015

Discuss

Answer & Solution

Answer: Option B

Solution:

Compressive strength of grey cast iron is 57 tonnes/cm

56

Y-alloy contains

A) 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium B) 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium C) 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium D) 5 to 6% tin, 2 to 3% copper and rest aluminium

Discuss

Answer & Solution

Answer: Option B

Solution:

Y-alloy contains 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

57

Wrought iron

A) Is a ductile material B) Can be easily forged or welded C) Cannot stand sudden and excessive shocks D) All of these

Discuss

Answer & Solution

Answer: Option D

Solution:

Wrought iron is an iron alloy with very low carbon content with respect to cast iron. It is soft, ductile, magnetic, and has high elasticity and tensile strength. It can be heated and reheated and worked into various shapes.

58

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

Discuss

Answer & Solution

Answer: Option B

Solution:

White cast iron Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable.
White cast iron is a cast iron without any alloy addition and with low C and Si content such that the structure is hard brittle iron carbide with no free graphite.
A fast cooling rate prevents the precipitation of C as graphite.

59

When the steel is normalized, its

A) Yield point increases B) Ductility decreases C) Ultimate tensile strength increases D) All of these

Discuss

Answer & Solution

Answer: Option D

Solution:

When the steel is normalized, its Yield point increases, Ductility decreases and Ultimate tensile strength increases.

60

Amorphous material is one

A) In which atoms align themselves in a geometric pattern upon solidification B) In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid C) Which is not attacked by phosphorous D) Which emits fumes on melting

Discuss

Answer & Solution

Answer: Option B

Solution:

Amorphous material is one In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

Engineering Materials MCQ Questions & Answers | Mechanical Engineering