chemical engineering MCQs – Page 4

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 Review each marked answer and report any item that may be outdated or unclear.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
61. The units of the rate constant for a second order reaction are__________________?
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A. Moles1. sec1

B. Moles-1. sec1

C. Sec-1. mole

D. Moles1. sec-1

62. Liquid nitrogen containers can be made from ___________________?
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A. Titanium

B. Austenitic stainless steel

C. Ferritic stainless steel

D. HSLA steel
63. Maraging steels derive their strength from the following mechanism ?
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A. A fine, highly dislocated and strong martensite

B. Fine dispersions of inter-metallic of Fe, Ni, Ti etc

C. Fine dispersions of alloy carbides in a ferrite matrix

D. Fine dispersions of Fe3 C nucleated on dislocations in austenite

64. Quartz is a ________________ material ?
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A. Piezoelectric

B. Ferromagnetic

C. Ferroelectric

D. Diamagnetic

65. Upto the critical radius of insulation, added insulation, will____________________?
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A. Increase the heat loss

B. Decrease heat loss and will have no effect beyond that

C. Decrease heat flux

D. Reduce convection heat loss compared to conduction heat less

66. ____________________ joint is mostly used for joining pipes carrying water at low pressure ?
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A. Socket

B. Bell and spigot

C. Union

D. Nipple

67. The most detrimental impurity in high pressure boiler feed water is ___________________?
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A. Turbidity

B. Dissolved salt

C. Silica

D. Suspended salt

68. ______________ circuit is most commonly used to measure strain with the help of a strain gauge?
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A. Voltage balancing potentiometric

B. Simple current sensitive

C. None of these

D. Ballast

69. Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of ______________ will facilitate the most accurate measurement of the temperature ?
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A. Brass

B. Steel

C. Copper

D. Aluminium

70. In Newtons law of viscosity, which states that the shear stress is proportional to the _____________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient) ?
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A. Vg

B. 1/V2

C. V2

D. 1/Vg

71. Secondary hardening in steels arises out of the _____________________?
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A. Precipitation of complex inter-metallic upon heat treatment

B. Decomposition of retained austenite upon heat treatment

C. Precipitation of fine alloy carbides at high temperatures

D. Refinement of ferrite grain size by working

72. ______________ has the highest melting point out of the following ?
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A. Tungsten

B. Molybdenum

C. Zirconium

D. Tantalum

73. Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ?
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A. Cobalt, chromium & nickel

B. Cobalt, chromium & tungsten

C. Cobalt, zirconium & molybdenum

D. Molybdenum, tungsten & chromium

74. Addition of silicon to cast iron ___________________?
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A. Improves its ductility

B. Does not promote graphite flakes formation

C. Increases the fluidity of molten metal

D. Promotes graphite module formation

75. Large diameter reinforced cement concrete (RCC) pipes are generally joined by ____________________ joint ?
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A. Flexible

B. Expansion

C. Collar

D. Flanged iron

76. Compressed dry air is used as the cutting fluid, while machining____________________?
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A. Steel

B. Cast iron

C. Aluminium

D. None of these

77. ____________________ flux is used for the extraction of metal from its self fluxing ores?
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A. No

B. Acid

C. Neutral

D. Basic

78. Which of the following is an unconventional source of energy ?
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A. Solar power

B. Thermal power

C. Nuclear-fusion power

D. Hydroelectric power

79. ________________ property of steel increases by addition of large amount of silicon in it?
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A. Mechanical

B. Machining

C. Magnetic

D. Refractory

80. Ceramic compounds as compared to metallic compounds ____________________ ?
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A. Have higher melting temperature

B. Resist greater tensile stress at room temperature

C. Are better conductor of electricity at higher temperature

D. Crystallise faster