August 2022

Question: __________ are not emitted by radioactive substances.
[A].

α-rays

[B].

β-rays

[C].

protons

[D].

positrons

Answer: Option C

Explanation:

No answer description available for this question.

Question: Number of electrons in the outermost shell of a semi-conductor material is
[A].

2

[B].

4

[C].

6

[D].

8

Answer: Option D

Explanation:

No answer description available for this question.

Question: Maximum hardenability of steel depends upon its
[A].

chemical composition

[B].

carbon content

[C].

grain size

[D].

alloying elements content

Answer: Option D

Explanation:

No answer description available for this question.

Question: Fine grained steels have
[A].

high brittleness

[B].

higher tendency to distort

[C].

high ductility

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Coarse grained steels have
[A].

low toughness

[B].

no tendency to distort

[C].

high density

[D].

very high toughness

Answer: Option B

Explanation:

No answer description available for this question.

Question: Dies for wire drawing are generally made of
[A].

mild steel

[B].

stainless steel

[C].

carbides

[D].

high carbon steel

Answer: Option A

Explanation:

No answer description available for this question.

Question: A spring material should have low
[A].

elastic limit

[B].

deflection value

[C].

fatigue resistance

[D].

none of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: Case hardening of a material is
[A].

followed by tempering or carburising.

[B].

preceded by its tempering.

[C].

done to get a soft ductile interior with a very hard surface.

[D].

carried out to get extreme hardness in its core.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Addition of __________ in steel can help in increasing the depth of hardness.
[A].

nickel

[B].

chromium

[C].

vanadium

[D].

tungsten

Answer: Option C

Explanation:

No answer description available for this question.

Question: Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.
[A].

working

[B].

bearing

[C].

yield

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.