Engineering Materials MCQ Questions & Answers

11

Which of the following is the binding material in cemented carbides?

A) Cobalt B) Nickel C) Vanadium D) Iron

Discuss

Answer & Solution

Answer: Option A

Solution:

Cobalt is the binding material in cemented carbides

12

Which of the following statement is correct?

A) The product produced by blast-furnace is called cast iron B) The pig iron is the name given to the product produced by cupola C) The cast iron has high tensile strength D) The chilled cast iron has no graphite

Discuss

Answer & Solution

Answer: Option D

Solution:

Chilled cast iron. Iron-carbon alloy with low graphitization factor so that chill occurs forming a graphite-free structure.
In order to achieve chilling, the silicon content is set to a low level depending on the wall thickness of the casting; the carbon content is approx. 2.5 to 3.8%.

13

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

Discuss

Answer & Solution

Answer: Option A

Solution:

Monel metal contains 63 to 67% nickel and 30% copper

14

Inconel is an alloy of

A) Nickel, Chromium and Iron B) Nickel, Copper C) Nickel, Chromium D) Nickel, Zinc

Discuss

Answer & Solution

Answer: Option A

Solution:

Inconel is a family of austenitic nickel-chromium-based superalloys.
Inconel alloys are oxidation-corrosion-resistant materials well suited for service in extreme environments subjected to pressure and heat.

15

The alloying element which increases residual magnetism and coercive magnetic force in steel for magnets is

A) Chromium B) Nickel C) Vanadium D) Cobalt

Discuss

Answer & Solution

Answer: Option D

Solution:

Cobalt improves strength at high temperatures and magnetic permeability.
Increases hardness, also allows for higher quenching temperatures (during the heat treatment procedure). Intensifies the individual effects of other elements in more complex steels. Co is not a carbide former, however adding Cobalt to the alloy allows for higher attainable hardness and higher red hot hardness.

16

Manganese in steel increases its

A) Tensile strength B) Hardness C) Ductility D) Fluidity

Discuss

Answer & Solution

Answer: Option A

Solution:

The effect of manganese in improving the mechanical properties of steel depends on its carbon content. Manganese also reduces the critical cooling rate during hardening, meaning it increases the hardenability of steel. Its effect on hardenability is higher than other alloying elements

17

Free cutting steels

A) Contain carbon in free from B) Require minimum cutting force C) Is used where rapid machining is the prime requirement D) Can be cut freely

Discuss

Answer & Solution

Answer: Option C

Solution:

Free cutting steels is used where rapid machining is the prime requirement

18

The cupola is used to manufacture

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

Discuss

Answer & Solution

Answer: Option B

Solution:

A cupola or cupola furnace is a melting device used in foundries that can be used to melt cast iron

19

Tungsten in high speed steel provides

A) Hot hardness B) Toughness C) Wear resistance D) Sharp cutting edge

Discuss

Answer & Solution

Answer: Option A

Solution:

Tungsten is a good carbide former that prevents grain growth, enhances toughness and increases red hardness and high temperature strength. Tungsten is used in hot forming tool steels and high-speed steels.

20

1841 high speed steel contains

A) Vanadium 4%, chromium 18% and tungsten 1% B) Vanadium 1%, chromium 4% and tungsten 18% C) Vanadium 18%, chromium 1% and tungsten 4% D) None of the above

Discuss

Answer & Solution

Answer: Option B

Solution:

1841 high speed steel contains Vanadium 1%, chromium 4% and tungsten 18%

Engineering Materials MCQ Questions & Answers | Mechanical Engineering