Chemical Engineering Basics

231. Electrometallurgy is not involved in the extraction of __________ from its ore.

  1. Aluminium
  2. Tin
  3. Lead
  4. Both (B) & (C)

Correct answer: (D)
Both (B) & (C)

232. Electrostatic separation of minerals from each other is based on their differences in the following property.

  1. Densities
  2. Magnetic permeabilities
  3. Electrical conductivities
  4. Hardness

Correct answer: (C)
Electrical conductivities

233. Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.

  1. Annealing
  2. Toughening
  3. Work hardening
  4. Tempering

Correct answer: (A)
Annealing

234. Encyclopaedia of Chemical Technology has been

  1. Authored by Kirk Othmer
  2. Edited by Perry and Chilton
  3. Edited by Kirk Othmer
  4. Authored by Perry and Chilton

Correct answer: (C)
Edited by Kirk Othmer

235. Energy of the sun arises mainly from __________ reactions.

  1. Fusion
  2. Fission
  3. Combustion
  4. None of these

Correct answer: (A)
Fusion

236. Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.

  1. 0.8
  2. 7.8
  3. 200
  4. 10000

Correct answer: (A)
0.8

237. Enzymes belong to the category of

  1. Proteins
  2. Carbohydrates
  3. Vitamins
  4. Fats

Correct answer: (A)
Proteins

238. Euler number is defined as the ratio of inertia force to __________ force.

  1. Pressure
  2. Elastic
  3. Gravity
  4. Viscous

Correct answer: (A)
Pressure

239. Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.

  1. 723
  2. 959
  3. 1147
  4. 1493

Correct answer: (A)
723

240. Eutectoid composition of carbon steel at room temperature is

  1. Cementite
  2. Pearlite
  3. Martensite
  4. Ferrite

Correct answer: (B)
Pearlite

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