Chemical Engineering Basics

131. Atomic __________ of an element is a whole number.

1. Weight
2. Number
3. Volume
4. Radius

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132. Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250- 525°C, thereby changing austenite to

1. Sorbite
2. Bainite
3. Martensite
4. Troostite

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133. Austempering process results in the formation of __________ structure.

1. Martensitic
2. Bainitic
3. Carburised
4. Stressed

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134. Auto collimator is used to check

1. Flatness
2. Angle
3. Rotor balancing
4. Roughness

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135. Babbitt lining is used on brass/bronze bearings to increase the

1. Antifriction properties
2. Compressive strength
3. Bearing resistance
4. Wear resistance

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136. Bad odour in sanitary latrines is reduced by periodically sprinkling

1. Bleaching powder
2. Lime powder
3. Aluminium sulphate
4. None of these

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137. Baffles provided on the shell side of a shell and tube heat exchanger are meant for

1. Providing support for the tubes
2. Improving heat transfer
3. Both 'a' & 'b'
4. Preventing the fouling of tubes & stagnation of shell side fluid

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138. Basic open hearth furnace (BOF) is not used for producing __________ steel.

1. Killed
2. Rimming
3. High alloy
4. None of these

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139. Basicity [%Cao + %MgO + %SiO2) of the slag in Indian blast furnace is in the range of

1. 0.7-1.0
2. 1.1-1.4
3. 1.5 - 1.8
4. 2.0 - 2.5

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140. Batch process is preferred over continuous process, when the

1. Product yields and quality cannot be achieved in continuous process, because of long residence time
2. Sales demand of product is not steady
3. Same equipment cannot be used for several processes of the same nature
4. All (A), (B) & (C)

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