Engineering Materials MCQ Questions & Answers | Mechanical Engineering Page-4 section-3

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31.
Thermoplastic materials are those materials which

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

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

C. Are flexible and can withstand considerable wear under suitable conditions

D. Are used as a friction lining for clutches and brakes

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32.
Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio

A. 50 : 50

B. 30 : 70

C. 70 : 30

D. 40 : 60

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33.
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

A. 50 : 20 : 20 : 10

B. 40 : 30 : 20 : 10

C. 50 : 20 : 10 : 20

D. 30 : 20 : 30 : 20

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34.
Heavy duty leaf and coil springs contain carbon of the following order

A. 0.2%

B. 0.5%

C. 0.8%

D. 1.0%

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35.
Cold rolled steel sheets contain carbon of the following order

A. 0.1%

B. 0.2%

C. 0.4%

D. 0.6%

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36.
In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

A. In still air

B. Slowly in the furnace

C. Suddenly in a suitable cooling medium

D. Any one of these

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37.
Steel containing ferrite and pearlite is

A. Hard

B. Soft

C. Tough

D. Hard and tough

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38.
Ductile cast iron

A. Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

B. Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

C. Is produced by annealing process. It is soft, tough and easily machined metal

D. Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

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39.
Which of the following steel making process is being adopted at Rourkela (in India) Steel Plant?

A. Bessemer process

B. Open hearth process

C. Electric process

D. LD process

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40.
Quenching is not necessary when hardening is done by

A. Case hardening

B. Flame hardening

C. Nitriding

D. Any one of these

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Engineering Materials MCQ Questions & Answers | Mechanical Engineering

31. Thermoplastic materials are those materials which

Answer & Solution

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

Answer & Solution

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

Answer & Solution

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

Answer & Solution

35. Cold rolled steel sheets contain carbon of the following order

Answer & Solution

36. In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

Answer & Solution

37. Steel containing ferrite and pearlite is

Answer & Solution

38. Ductile cast iron

Answer & Solution

39. Which of the following steel making process is being adopted at Rourkela (in India) Steel Plant?

Answer & Solution

40. Quenching is not necessary when hardening is done by

Answer & Solution

Read More Section(Engineering Materials)

31.
Thermoplastic materials are those materials which

32.
Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio

33.
Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio

34.
Heavy duty leaf and coil springs contain carbon of the following order

35.
Cold rolled steel sheets contain carbon of the following order

36.
In full annealing, the hypo eutectoid steel is heated from 30°C to 50°C above the upper critical temperature and then cooled

37.
Steel containing ferrite and pearlite is

38.
Ductile cast iron

39.
Which of the following steel making process is being adopted at Rourkela (in India) Steel Plant?

40.
Quenching is not necessary when hardening is done by