Chemical Engineering Basics

181. Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is

  1. 3
  2. 5
  3. 0.5
  4. 1.5

Correct answer: (B)
5

182. Cold chisel & hammers are made of

  1. High speed steel
  2. High carbon steel
  3. Forged steel
  4. Mild steel

Correct answer: (B)
High carbon steel

183. Cold chisel‟s hammers are made of

  1. High speed steel
  2. High carbon steel
  3. Forged steel
  4. Mild steel

Correct answer: (B)
High carbon steel

184. Cold cracking in the heat affected zone of a high strength steel weld can take place because of the

  1. Retained austenite
  2. Martensite formation
  3. Relatively high sulphur content in the base metal
  4. Sufficient hydrogen present in the welding arc

Correct answer: (B)
Martensite formation

185. Cold heading or upsetting is categorised as the __________ process.

  1. Extrusion
  2. Bending
  3. Rolling
  4. Forging

Correct answer: (D)
Forging

186. Cold working of a material results in increase in hardness, which is termed as the __________ hardening.

  1. Cold
  2. Work
  3. Age
  4. Induction

Correct answer: (B)
Work

187. Colour comparator is used to measure the

  1. pH value
  2. Electrode potential
  3. Colour intensity
  4. None of these

Correct answer: (A)
pH value

188. Common salt is produced from sea water in India generally by the __________ method.

  1. Freeze drying
  2. Solar evaporation
  3. Electrolytic
  4. None of these

Correct answer: (B)
Solar evaporation

189. Compressed dry air is used as the cutting fluid, while machining

  1. Steel
  2. Cast iron
  3. Aluminium
  4. None of these

Correct answer: (B)
Cast iron

190. Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is

  1. R ln 2
  2. -R ln 2
  3. 3 R ln 2
  4. -3R ln 2

Correct answer: (A)
R ln 2

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