Engineering Materials MCQ Questions & Answers | Mechanical Engineering Page-5 section-3

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41.
Which is false statement about case hardening? Case hardening is done by

A. Electroplating

B. Cyaniding

C. Induction hardening

D. Nitriding

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42.
The machinability of aluminium increases when _________ is added to aluminium.

A. Copper

B. Magnesium

C. Silicon

D. Lead and bismuth

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43.
In high speed steels, manganese is used to tougher the metal and to increase its

A. Yield point

B. Critical temperature

C. Melting point

D. Hardness

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44.
Following elements have face-centered cubic structure

A. Gamma iron (910°C to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt

B. Mg, Zn, Ti, Zr, Br, Cd

C. A iron (below 910°C and between 1400°C to 1539°C), W

D. All of the above

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45.
The crystal structure of brass is

A. F.C.C.

B. B.C.C.

C. H.C.P.

D. Orthorhombic crystalline structure

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46.
Which of the following has highest specific strength of all structural materials?

A. Magnesium alloys

B. Titanium alloys

C. Chromium alloys

D. Magnetic steel alloys

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47.
Blast furnace produces following by reduction of iron ore

A. Cast iron

B. Pig iron

C. Wrought iron

D. Malleable iron

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48.
Shock resistance of steel is increased by adding

A. Nickel

B. Chromium

C. Nickel and chromium

D. Sulphur, lead and phosphorus

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49.
Corrosion resistance of steel is increased by adding

A. Chromium and nickel

B. Nickel and molybdenum

C. Aluminium and zinc

D. Tungsten and sulphur

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50.
Cobalt in steel

A. Improves wear resistance, cutting ability and toughness

B. Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties

C. Improves cutting ability and reduce hardenability

D. Gives ductility, toughness, tensile strength and anti corrosion property

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Engineering Materials MCQ Questions & Answers | Mechanical Engineering

41. Which is false statement about case hardening? Case hardening is done by

Answer & Solution

42. The machinability of aluminium increases when _________ is added to aluminium.

Answer & Solution

43. In high speed steels, manganese is used to tougher the metal and to increase its

Answer & Solution

44. Following elements have face-centered cubic structure

Answer & Solution

45. The crystal structure of brass is

Answer & Solution

46. Which of the following has highest specific strength of all structural materials?

Answer & Solution

47. Blast furnace produces following by reduction of iron ore

Answer & Solution

48. Shock resistance of steel is increased by adding

Answer & Solution

49. Corrosion resistance of steel is increased by adding

Answer & Solution

50. Cobalt in steel

Answer & Solution

Read More Section(Engineering Materials)

41.
Which is false statement about case hardening? Case hardening is done by

42.
The machinability of aluminium increases when _________ is added to aluminium.

43.
In high speed steels, manganese is used to tougher the metal and to increase its

44.
Following elements have face-centered cubic structure

45.
The crystal structure of brass is

46.
Which of the following has highest specific strength of all structural materials?

47.
Blast furnace produces following by reduction of iron ore

48.
Shock resistance of steel is increased by adding

49.
Corrosion resistance of steel is increased by adding

50.
Cobalt in steel