Question:

When steel is made from phosphatic iron, it is likely to be

A.

Hard

B.

Ductile

C.

Brittle

D.

Tough

Answer» c. Brittle

Question:

In nodular iron, graphite is present in the form of

A.

Powder

B.

Flakes

C.

Needles

D.

Spheroids

Answer» d. Spheroids

Question:

The property which enables metals to be drawn into wire is known as

A.

Plastic deformation

B.

Ductility

C.

Malleability

D.

Elastic deformation

Answer» b. Ductility

Question:

Heating elements of electrical heaters are made of

A.

Nichrome

B.

Tungsten

C.

Invar

D.

Nicheloy

Answer» a. Nichrome

Question:

Which of the following element does not impart hardness to steel?

A.

Copper

B.

Nickel

C.

Silicon

D.

Chromium

Answer» a. Copper

Question:

The flux used in brazing is usually

A.

Common salt

B.

Lime

C.

Borax

D.

Alum

Answer» c. Borax

Question:

Endentor used in Vickers hardness testing machine is

A.

Diamond square-based pyramid

B.

10 mm dia ball

C.

15 mm dia ball

D.

25 mm dia ball

Answer» a. Diamond square-based pyramid

Question:

Which hardening process is generally not used for steels?

A.

Age hardening

B.

Pack carburising

C.

Induction hardening

D.

Nitriding

Answer» a. Age hardening

Question:

Compressive strength is highest in case of

A.

Mild steel

B.

Wrought iron

C.

High carbon steel

D.

Cast iron

Answer» c. High carbon steel