chemical engineering MCQs – Page 3

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

41. Laser welding is widely employed in the __________________ industries ?
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A. Process

B. Electronic

C. Heavy

D. Structural

42. Case hardening is not done by________________?
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A. Nitriding

B. Hot dipping

C. Electroplating

D. Both B & C

43. ______________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently ?
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A. Bell and Spigot

B. Expansion

C. Collar

D. Flanged

44. The joint for soldering is supported by binding wire made of ____________________?
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A. Stainless steel

B. Mild steel

C. Copper

D. Soft iron

45. Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner ?
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A. Output & fineness

B. Velocity

C. Both A. & B.

D. None of these

46. Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is____________________?
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A. Zero

B. Very low which prevents their ignition by compression

C. None of these

D. Very high which prevents their ignition by compression

47. In Imperial Smelting Process for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _______________________?
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A. Mixture of water and air

B. Rain of molten lead

C. Jet of water at high pressure

D. Blast of air

48. Factor of safety is the ratio of the ___________________ stress to the working stress?
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A. Bearing

B. Yield

C. Tensile

D. Compressive

49. Tumbling is the process of improving the ________________ of the materials/parts ?
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A. Surface cleanliness

B. Fatigue limit

C. Creep limit

D. Surface finish

50. Unit of viscosity in CGS system is_______________________?
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A. gm .cm-1 sec-1

B. gm .cm-2, sec-1

C. gm . cm . sec-1

D. gm . cm2 . sec-2

51. Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of__________________?
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A. 1:04

B. 1 : 1

C. 2:01

D. 1:02

52. Filler material used in welding should have _________________ as compared to the parent metal to be welded ?
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A. Lower melting temperature

B. Same melting temperature

C. Same composition

D. Both B & C

53. The most suitable material of construction for a sewer to carry sewage under high pressure is________________________?
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A. Cement concrete

B. Steel

C. Asbestos cement

D. Stoneware

54. Thermal efficiency of an internal combustion engine is around ______________ percent?
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A. 35

B. 80

C. 65

D. 8

55. During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to____________________?
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A. Cube of time

B. Square of time

C. Square root of time

D. Time

56. The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as__________________?
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A. Tough

B. Ductile

C. Plastic

D. Rigid

57. An ideal material for making cooking vessels should have___________________?
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A. High heat capacity

B. Low heat capacity

C. High thermal conductivity

D. Both B. and C.

58. Joining of thin foils is preferred to be done by _____________________?
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A. Gas welding

B. Microwaves

C. Gamma rays

D. X-rays

59. The same volume of all gases is representative of their_____________________?
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A. Specific gravities

B. Molecular weights

C. Gas characteristic constants

D. Densities

60. Pressure exerted by a liquid depends upon its_________________?
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A. Density

B. Viscosity

C. Surface tension

D. Buoyancy

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