chemical engineering chemical engineering basics MCQs – Page 11

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 Review each marked answer and report any item that may be outdated or unclear.

chemical engineering chemical engineering basics Mcqs
201. Co-efficient of performance of a Carnot cycle refrigerator operating between 23C and + 27C is ________________?
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A. 0.5

B. 3

C. 5

D. 1.5

202. Presence of nickel & chromium in steel does not raise its _________________?
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A. Machining properties

B. Ductility

C. Elastic limit

D. Resilience

203. High speed steel tools retain their hardness upto a temperature of __________________ C?
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A. 750

B. 1100

C. 900

D. 500

204. The thermodynamic law, PVy = constant, is not followed by the __________________?
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A. Free expansion of an ideal gas

B. Adiabatic compression of air

C. Adiabatic expansion of steam in turbine

D. Ideal compression of air

205. Blast furnace slag is mainly molten_________________?
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A. Iron pyrite

B. Sand

C. Calcium silicate

D. Magnesium silicate

206. Which of the following metals is the most prone to work hardening ?
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A. Copper

B. Lead

C. Brass

D. Aluminium

207. The pressure outside a bubble/droplet of liquid is ________________ the internal pressure?
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A. Equal to

B. Less than

C. Greater than

D. Unpredictable; depends on the bubble size

208. To counteract the bad effects of strain hardening on a cold formed part, it must be ______________________?
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A. Normalised

B. Annealed

C. Hardened

D. Tempered

209. Super heating of steam is done at constant___________________?
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A. Pressure

B. Volume

C. Enthalpy

D. Entropy

210. ____________________ flux is used for the extraction of metal from its self fluxing ores?
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A. Neutral

B. Acid

C. Basic

D. No
211. Dowtherm is a____________________?
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A. Product of coal tar distillation

B. High temperature heating medium (a petroleum product)

C. Very heat sensitive material

D. None of these

212. Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as_________________?
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A. Gr0.33, Gr0.25

B. Gr0.25, Gr0.33

C. Gr, Gr0.25

D. Gr0.25, Gr
213. Metal shots used in shot blasting are made of ______________________?
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A. Bronze

B. Stellite

C. Steel

D. Lead

214. The surface tension of a liquid, at critical temperature is____________________?
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A. Zero

B. Infinity

C. Indeterminate

D. Same as that at any other temperature

215. Stainless steel is welded with difficulty because of____________________?
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A. Its high melting temperature

B. Chances of cracking

C. Oxide film formation

D. Chromium carbide formation

216. The thickness of oxide film is y at time t. If K1, K2 and K3 are the temperature dependent constants, the parabolic law of oxidation is given by __________________?
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A. y = k1t3 + k2

B. y2 = 2k1t + k2

C. y = k1 ln (k2t + k3)

D. y = k1 t + k2

217. Difference at any instant between the value of the controlled variable and the set point is called the__________________?
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A. Error ratio

B. Deviation

C. Differential gap

D. Derivative time

218. Compressed dry air is used as the cutting fluid, while machining____________________?
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A. Steel

B. None of these

C. Aluminium

D. Cast iron
219. Titanium is added to molten aluminium alloys before casting for the purpose of_____________________?
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A. Grain refinement

B. Improving fluidity

C. Increasing corrosion resistance

D. Reducing porosity

220. Which one is neutral in character ?
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A. N2O5

B. N2O3

C. N2O

D. N2O4