Engineering Materials Practice Set-1

21. In a hardening process, the hypo-eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

Heated below or closes to the lower critical temperature and then cooled slowly

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

22. When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

Less than

Equal to

None of these

More than

23. Which of the following has a fine gold colour and is used for imitation jewellery?

Silicon bronze

Gun metal

Babbitt metal

Aluminium bronze

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

Ferrite and pearlite

Mainly ferrite

Pearlite and cementite

Mainly pearlite

25. The correct composition of Babbitt metal is

82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi

87% Sn, 4% Cu, 8% Sb, 1% Al

90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg

26. Y-alloy contains

3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

5 to 6% tin, 2 to 3% copper and rest aluminium

27. The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C below upper critical temperature

30° C to 50° C above upper critical temperature

30° C to 50° C above lower critical temperature

30° C to 50° C below lower critical temperature

28. According to Indian standard specifications, SG 400/15 means

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

None of the above

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

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

29. Pick up the wrong statement Nickel and chromium in steel help in

Improving machining properties

Providing corrosion resistance

Raising the elastic limit

Providing high strength at elevated temperatures

30. Body centered cubic space lattice is found in

Gamma iron, aluminium, copper, lead, silver and nickel

None of the above

Zinc, magnesium, cobalt, cadmium, antimony and bismuth

Alpha iron, tungsten, chromium and molybdenum

Engineering Materials Practice Set-1

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Engineering Materials Practice Set-1

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection