Engineering Materials MCQs

Question 1

Which is false statement about annealing? Annealing is done to

Accepted Answer

Harden steel slightly

Answer

Relieve stresses

Answer

Improve machining characteristic

Answer

Soften material

Question 2

Eutectoid reaction occurs at

Accepted Answer

727°C

Answer

600°C

Answer

1147°C

Answer

1493°C

Question 3

When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

Accepted Answer

Ferrite and pearlite

Answer

Mainly ferrite

Answer

Mainly pearlite

Answer

Pearlite and cementite

Question 4

Pick up the wrong statement

Accepted Answer

Aluminium in steel results in excessive grain growth

Answer

Manganese in steel induces hardness

Answer

Nickel and chromium in steel helps in raising the elastic limit and improve the resilience and ductility

Answer

Tungsten in steels improves magnetic properties and hardenability

Question 5

Which of the following metal shrinks most from molten state to solid state?

Accepted Answer

Admiralty metal

Answer

Cast iron

Answer

Cast steel

Answer

Brass

Question 6

Thermoplastic materials are those materials which

Accepted Answer

Do not become hard with the application of heat and pressure and no chemical change occurs

Answer

Are formed into shape under heat and pressure and results in a permanently hard product

Answer

Are flexible and can withstand considerable wear under suitable conditions

Answer

Are used as a friction lining for clutches and brakes

Question 7

Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio

Accepted Answer

70 : 30

Answer

50 : 50

Answer

30 : 70

Answer

40 : 60

Question 8

Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

Accepted Answer

50 : 20 : 20 : 10

Answer

40 : 30 : 20 : 10

Answer

50 : 20 : 10 : 20

Answer

30 : 20 : 30 : 20

Question 9

Heavy duty leaf and coil springs contain carbon of the following order

Accepted Answer

1.0%

Answer

0.2%

Answer

0.5%

Answer

0.8%