Engineering Materials MCQ Questions & Answers

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Each section contains 100 MCQs on Engineering Materials .

Iron ore is usually found in the form of

A) Oxides B) Carbonates C) Sulphides D) All of these

Discuss

Answer & Solution

Answer: Option D

Solution:

Iron ore is usually found in the form of Oxides, Carbonates and Sulphides

German silver contains

A) 1% silver B) 2% silver C) 5% silver D) No silver

Discuss

Answer & Solution

Answer: Option D

Solution:

The usual formulation of german silver is 60% copper, 20% nickel and 20% zinc. German silver is named due to its silvery appearance, but it contains no elemental silver unless plated.

Drop forging dies contain carbon of the order of

A) 0.1 to 0.2% B) 0.25 to 0.5% C) 0.6 to 0.7% D) 0.7 to 0.9%

Discuss

Answer & Solution

Answer: Option C

Solution:

Drop forging dies contain carbon of the order of 0.6 to 0.7%

Combined carbon in iron makes the metal

A) Soft and gives coarse grained crystalline structure B) Soft and gives a fine grained crystalline structure C) Hard and gives a coarse grained crystalline structure D) Hard and gives a fine grained crystalline structure

Discuss

Answer & Solution

Answer: Option D

Solution:

Combined carbon in iron makes the metal Hard and gives a fine grained crystalline structure

Free carbon in iron makes the metal

A) Soft and gives a coarse grained crystalline structure B) Soft and gives a fine grained crystalline structure C) Hard and gives a coarse grained crystalline structure D) Hard and gives a fine grained crystalline structure

Discuss

Answer & Solution

Answer: Option A

Solution:

Free carbon in iron makes the metal Soft and gives a coarse grained crystalline structure

In mottled cast iron, carbon is available in

A) Free form B) Combined form C) Nodular form D) Partly in free and partly in combined state

Discuss

Answer & Solution

Answer: Option D

Solution:

In mottled cast iron, carbon is available in Partly in free and partly in combined state

The presence of hydrogen in steel causes

A) Reduced neutron absorption cross-section B) Improved Weldability C) Embrittlement D) Corrosion resistance

Discuss

Answer & Solution

Answer: Option C

Solution:

. The result of hydrogen embrittlement is that components crack and fracture at stresses less than the yield strength of the metal.

Maximum percentage of carbon in austenite is

A) 0.025% B) 0.26% C) 0.8% D) 1.7%

Discuss

Answer & Solution

Answer: Option D

Solution:

Austenite is a face centred cubic structure (fcc). It is stable at temperatures above 723C depending upon carbon content. It can dissolve upto 2% carbon.

The hardness and tensile strength in austenitic stainless steel can be increased by

A) Hardening and cold working B) Normalizing C) Martempering D) Full annealing

Discuss

Answer & Solution

Answer: Option A

Solution:

The hardness and tensile strength in austenitic stainless steel can be increased by Hardening and cold working

Machining properties of steel are improved by adding

A) Sulphur, lead, phosphorous B) Silicon, aluminium, titanium C) Vanadium, aluminium D) Chromium, nickel

Discuss

Answer & Solution

Answer: Option A

Solution:

Machining properties of steel are improved by adding Sulphur, lead, phosphorous

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Engineering Materials MCQ Questions & Answers | Mechanical Engineering