chemical engineering chemical engineering basics MCQs – Page 10

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 Review each marked answer and report any item that may be outdated or unclear.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
181. Electrical conductivities of semi-conductors are of the order of ______________ ohm/cm ?
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A. 103

B. 1015

C. 10-3

D. 15-Oct

182. To improve the machinability of steel, it is generally subjected to _____________________?
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A. Annealing

B. Spheroidising

C. Normalising

D. Tempering

183. Liquid nitrogen containers can be made from ___________________?
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A. HSLA steel

B. Titanium

C. Ferritic stainless steel

D. Austenitic stainless steel

184. Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of ______________ will facilitate the most accurate measurement of the temperature ?
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A. Brass

B. Steel

C. Aluminium

D. Copper
185. Brittleness induced due to the presence of sulphur in steel can be reduced by adding____________________?
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A. Vanadium

B. Manganese

C. Magnesium

D. Copper

186. Austempering process results in the formation of ________________ structure ?
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A. Bainitic

B. Stressed

C. Carburised

D. Martensitic

187. Oxygen cylinders used for autogenous (cutting/welding) purposes are ___________________?
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A. Welded steel cylinders

B. Seamless & made of steel

C. Heat treated before use

D. Made by sand casting

188. Case hardening is not done by________________?
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A. Nitriding

B. Hot dipping

C. Electroplating

D. Both B & C
189. Eutectoid composition of carbon steel at room temperature is___________________?
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A. Cementite

B. Ferrite

C. Martensite

D. Pearlite
190. Material of construction of foundry crucible is _________________?
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A. Lead

B. Graphite

C. Cast iron

D. Stainless steel

191. Which of the following is not a charge material for cupola ?
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A. Limestone

B. Pig iron

C. Iron ore

D. Iron scrap

192. With increase in temperature, the surface tension of water_______________________?
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A. Increases linearly

B. Remain constant

C. Decreases

D. Increases

193. _______________ test can be termed as the semi-destructive test?
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A. Hardness

B. Charpy

C. Torsion

D. Impact

194. Dephosphorization of molten pig iron is favoured by_______________________?
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A. Reducing and basic slag

B. High activity co-efficient of phosphorous in metal

C. Oxidising and basic slag

D. Oxidising and neutral slag

195. The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the___________________?
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A. Floating control action

B. None of these

C. On-off control

D. Final control element
196. Current employed in resistance welding ranges from ____________________ kVA/cm2?
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A. 1.2 to 2.5

B. 7.5 to 8.5

C. 10.5 to 15.5

D. 4.5 to 6.2
197. A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material ?
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A. Glass

B. Rubber

C. Brass

D. Steel
198. Boiler tube size is specified by its thickness and _____________________ diameter ?
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A. Mean

B. Inside

C. None of these

D. Outside
199. Thermal efficiency of an internal combustion engine is around ______________ percent?
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A. 35

B. 65

C. 80

D. 8

200. The substance used as a smoke screen in warfare is___________________?
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A. SiCl4

B. PCl5

C. C2H2

D. P2O5