Chemical Engineering Basics

101. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about

1. 9 : 1
2. 17 : 1
3. 23 : 1
4. 29 : 1

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102. Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be

1. 9.5 : 1
2. 12.5 : 1
3. 15.5 : 1
4. 18.5 : 1

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103. Air-petrol ratio for maximum power generation in spark ignition engine is about

1. 6 : 1
2. 12 : 1
3. 18 : 1
4. 24 : 1

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104. Air-petrol ratio in an automotive petrol engine is around

1. 14 : 1
2. 22 : 1
3. 25 : 1
4. 4 : 1

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105. All of the following alloying elements of steel increases hardness but sacrifice ductility, except

1. Nickel
2. Vanadium
3. Molybdenum
4. Chromium

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106. All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.

1. Deuterium
2. Hydrogen
3. Neon
4. Helium

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107. Alloy powder manufactured by the following process have spherical shapes.

1. Electrochemical deposition
2. Gaseous reduction
3. Atomisation
4. Mechanical attrition

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108. Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are:

1. Nickel, cobalt & chromium
2. Tungsten, chromium & cobalt
3. Manganese, chromium & cobalt
4. Tungsten, molybdenum & nickel

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109. Alloys having more than 80% copper are generally more

1. Abrasion resistant
2. Corrosion resistant
3. Prone to season cracking
4. Machinable

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110. Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is

1. 5CaO. 3 Al₂O₃
2. 3CaO. Al₂O₃
3. 3CaO. SiO₂
4. 2CaO. SiO₂

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