chemical engineering Mcqs
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

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

81. In chemical dehumidification process___________________?
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A. Dry bulb temperature remains constant

B. Wet bulb temperature increases

C. Dry bulb temperature increases

D. Dew point temperature increases

82. The most commonly used moderator in nuclear power plants is__________________?
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A. Heavy water

B. Beryllium

C. Light water

D. Graphite
83. Property responsible for the talcum powder to cling to the skin is the__________________?
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A. Capillary action

B. Surface tension

C. Adhesion

D. Cohesion

84. Which of the following is used to produce draught in the locomotive boilers ?
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A. Chimney

B. Forced draught fan

C. Steam jet arrangement

D. Induced draught fan

85. Silicon percentage in silicon steel used for electrical equipments is about______________?
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A. 4.0

B. 1

C. 8

D. 14

86. Which of the following phenomenon will exhibit the minimum heat transfer ?
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A. Free convection in air

B. Forced convection in air

C. Boiling

D. Conduction in air
87. Cryogenics is concerned with the generation & use of low temperature in the range of____________________?
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A. 0C to 123C

B. 0K to 123K

C. 0C to 273C

D. 0K to 273K

88. Corrosion is____________________?
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A. A physical phenomenon

B. Same as erosion

C. A chemical phenomenon

D. An uncontrollable phenomenon

89. Corona discharge is related to the operation of a/an_______________________?
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A. Fast breeder reactor

B. Electrostatic precipitator

C. Induction motor

D. Magneto hydrodynamic generator (MHD)

90. A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its_______________?
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A. Vapor pressure

B. Saturated humidity

C. Aqueous tension

D. Absolute humidity

91. A dummy activity is used in PERT network to describe the_____________________?
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A. Precedence relationship

B. Necessary time delay

C. Resource idleness

D. Resource restriction

92. Magnetic permeability of iron is increased by its_____________________?
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A. Alloying with cobalt

B. Purification

C. Alternate heating & cooling

D. Decarburising

93. Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a _______________ calorimeter ?
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A. Bomb

B. Boys

C. Junkers

D. Throttling
94. In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (?), (ii) molecular diffusivity (?) and thermal diffusivity (?). The units of these quantities are ?
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A. ? , ? and ? all have units of m2/s

B. ? , ? and ? all have units of m/s

C. ? and ? have units of m/s, while ? has unit of m2/s

D. ? and ? have units of m2/s, while ? has unit of m/s
95. Gratings is associated with the measurement of____________________?
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A. Surface texture

B. Flatness

C. Linear displacement

D. Concavity/convexity

96. Amortization in respect of financial obligation of a company means the_____________________?
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A. Liquidation of financial obligations on instalment basis

B. Modernisation of the plant equipments

C. Liquidation of all the obsolete equipments of the company

D. Commitment of financial obligation on priority

97. ______________________ is used as a material of construction for the blade of power saw ?
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A. High speed steel

B. Wrought iron

C. Mild steel

D. Stainless steel

98. The noble metals________________?
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A. Are the lowermost in the electro-chemical series of metals

B. Do not resist corrosion very strongly

C. Are exemplified by Na, K and Li

D. None of these

99. Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?
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A. Brinell hardness test

B. Vickers hardness test

C. Shore scleroscope test

D. Rockwell hardness test

100. The process of removal of scale formed during hot rolling of steel is termed as_________________?
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A. Skimming

B. Descaling

C. Shot blasting

D. Pickling