Chemical Engineering Basics

161. Carnot cycle is also termed as the constant __________ cycle in thermodynamics.

1. Entropy
2. Pressure
3. Volume
4. Heat

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162. Cascade control is

1. The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller
2. Used when changes in process conditions cause serious upsets in the controlled variable
3. Useful to control flow from temperature
4. All 'a', 'b' & 'c'

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163. Case hardening is not done by

1. Nitriding
2. Hot dipping
3. Electroplating
4. Both ‘b’ & ‘c’

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164. Case hardening of a material is

1. Followed by tempering or carburising
2. Preceded by its tempering
3. Done to get a soft ductile interior with a very hard surface
4. Carried out to get extreme hardness in its core

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165. Cassiterite is an ore of

1. Tin
2. Lead
3. Molybdenum
4. Chromium

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166. Cast iron contains __________ percent carbon.

1. 2.5
2. 3.75
3. 4.75
4. 5.25

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167. Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is

1. Alumina
2. Platinum
3. Vanadium pentoxide
4. Iron oxide

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168. Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is

1. Nickel
2. Cobalt
3. Vanadium
4. Platinum

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169. Cemented carbide tools are not suitable for cutting

1. Aluminium
2. Brass
3. Cast iron
4. Steel

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170. Cementite is in the lamellar form in the __________ phase of steel.

1. Martenistic
2. Bainitic
3. Pearlitic
4. Ferritic

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