Mechanical Engineering

Question: For the pipe fitting like elbow, tee, union etc., which of the following is preferred?
[A].

Pig iron

[B].

Malleable iron

[C].

Spheroidal graphite cast iron

[D].

High carbon steel

Answer: Option B

Explanation:

No answer description available for this question.

Question: Grey cast iron is __________ than white cast iron.
[A].

softer

[B].

harder

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following statement is correct?
[A].

The product produced by blastfurnace 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.

Answer: Option D

Explanation:

No answer description available for this question.

Question: According to Indian standard specifications, SG 400/15 means
[A].

spheroidal graphite cast iron with B.H.N. 400 and minimum tensile strength 15 MPa

[B].

spheroidal graphite cast iron with minimum tensile strength 400 MPa and 15 percent elongation

[C].

spheroidal graphite cast iron with minimum compressive strength 400 MPa and 15 percent reduction in area

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: White cast iron has
[A].

carbon in the form of carbide

[B].

low tensile strength

[C].

high compressive strength

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: According to Indian standard specifications, cast iron designated by ‘FG 150’ means
[A].

white cast iron with B.H.N. 150

[B].

white cast iron with 150 MPa as minimum compressive strength

[C].

grey cast iron with B.H.N. 150

[D].

grey cast iron with 150 MPa as minimum tensile strength

Answer: Option D

Explanation:

No answer description available for this question.

Question: Grey cast iron has
[A].

carbon in the form of free graphite

[B].

high tensile strength

[C].

low compressive strength

[D].

all of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Malleable cast iron is produced
[A].

by adding magnesium to molten cast iron

[B].

by quick cooling of molten cast iron

[C].

from white cast iron by annealing process

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Nodular cast iron is produced by adding __________ to the molten cast iron.
[A].

nickel

[B].

chromium

[C].

copper

[D].

magnesium

Answer: Option D

Explanation:

No answer description available for this question.

Question: White cast iron has a high tensile strength and a low compressive strength.
[A].

Yes

[B].

No

Answer: Option B

Explanation:

White cast iron has a low tensile strength and a high compressive strength.

Source: https://en.wikipedia.org/wiki/Cast_iron#Table_of_comparative_qualities_of_cast_irons