chemical engineering MCQs – Page 13

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
241. Machinability of hard alloys and tool steels is improved by_____________________?
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A. Spheroidising

B. Annealing

C. Tempering

D. Normalising

242. Cast iron contains ____________________ percent carbon?
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A. 3.75

B. 2.5

C. 5.25

D. 4.75

243. Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be_____________________?
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A. 1.25

B. 5

C. 3.75

D. 2.5

244. The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the________________?
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A. Resilience

B. Endurance limit

C. Creep strength

D. Fatigue strength

245. Work done by a/an _________________ process is determined by ?p. dv ?
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A. Isentropic

B. Isothermal

C. Adiabatic

D. Quasi-static
246. Friction factor for fluid flow in pipe does not depend upon the________________?
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A. Pipe length

B. Mass flow rate of fluid

C. Pipe roughness

D. Fluid density & viscosity

247. The most important requirement for aluminium industry is the availability of cheap _______________?
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A. Abundant water

B. Ore

C. Electrical power

D. Labour

248. Which of the following does not have a sharp melting point ?
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A. Thoria

B. Glass

C. Pig iron

D. Ice

249. The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding _______________ grinding wheel is normally used ?
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A. Silicon carbide

B. Soft

C. Aluminium oxide

D. Hard

250. Maximum permissible air velocity in pipelines is about ______________ metre/second ?
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A. 20

B. 10

C. 40

D. 5

251. Resistance of an electrical conductor is proportional to its (where, l = length and A = crosssectional area of the conductor)________________?
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A. A

B. l

C. A2

D. Both A. & B.
252. The substance used as a smoke screen in warfare is___________________?
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A. P2O5

B. C2H2

C. PCl5

D. SiCl4
253. Difference at any instant between the value of the controlled variable and the set point is called the__________________?
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A. Deviation

B. Error ratio

C. Differential gap

D. Derivative time

254. What is the value of included angle of a triangular notch for maximum discharge ?
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A. 90

B. 120

C. 60

D. 30

255. X-rays are__________________?
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A. Positively charged

B. Neutral

C. Of higher wavelength than visible light

D. Negatively charged

256. In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that ?
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A. Compared to the mass flow rate of cooling water, the rate of condensation of steam is

B. ause of its lower specific volume compared to steam

C. Maintaining vacuum on tube side is more difficult than that on the shell side

D. ariably smaller

E. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient

F. Condenser can act as a storage unit for condensed steam

257. Evaporative cooling process employs a combination of cooling and humidification in which the____________________?
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A. Sensible heat is removed and the latent heat is added

B. Sensible heat is added and latent heat is removed

C. Sensible heat is added

D. Latent heat is removed

258. Moist air is cooled along the line of constant ________________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs ?
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A. Relative humidity

B. Dew point temperature

C. Enthalpy

D. Wet bulb temperature

259. Brittleness induced due to the presence of sulphur in steel can be reduced by adding______________?
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A. Manganese

B. Vanadium

C. Magnesium

D. Copper

260. For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot ?
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A. Enthalpy entropy

B. Enthalpy-pressure

C. Temperature pressure

D. Temperature entropy