chemical engineering MCQs – Page 9

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 Review each marked answer and report any item that may be outdated or unclear.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

161. Addition of _______________ to steel does not help in improving its machinability ?
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A. Silicon

B. Sulphur

C. Phosphorous

D. Lead

162. FeO (s) + CO (g) = Fe (s) + CO2 (g), k = 0. 435 at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K ?
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A. 3.3

B. 1.3

C. 2.3

D. 1

163. A psychrometer does not measure the __________________ temperature of moist air?
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A. Dew point

B. Wet bulb

C. Dry bulb

D. None of these

164. The most serious manufacturing defect from fracture toughness point of view is____________________?
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A. Crack

B. Spherical inclusion

C. Pores

D. Surface roughness

165. A polymer is termed as an elastomer, if its percentage elongation is more than 100%. An elastomer is termed as rubber if its percentage elongation is more than _______________ percent ?
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A. 300

B. 200

C. 400

D. 150

166. Principal alloying element in Elinvar (used for making hair springs for watches) is__________________?
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A. Nickel

B. Aluminium

C. Zinc

D. Copper

167. Out of the following, the alloy which has equal percentage of constituents, is__________________?
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A. Constantan

B. Duralumin

C. White metal

D. Gun metal

168. Shaft/rotor speed is most accurately measured by a_________________?
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A. Strobometer

B. Frequency counter

C. Speedometer

D. Tachometer

169. _____________________ remains constant during the adiabatic cooling of moist air?
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A. Dry bulb temperature

B. Specific humidity

C. Wet bulb temperature

D. Relative humidity

170. The minimum and the maximum number of members required to form a Private Limited Joint Stock Company are respectively __________________?
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A. 13 and 55

B. 2 and 50

C. 10 and 50

D. 7 and 30

171. The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then_________________?
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A. Saturation temperature=dew point temperature

B. All A, B & C

C. Wet bulb temperature=dry bulb temperature

D. Wet bulb temperature=dew point temperature

172. Pick out the wrong statement ?
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A. A soft magnetic material should have high permeability and small area of hysteresis loop

B. Poissons ratio of high melting point metals is more than unity

C. Solders generally melt at less than 185C

D. Steel produced by B.O.F process is ideally suited for manufacturing flat product

173. Which of the following is an example of cathodic protection of metals against corrosion ?
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A. Galvanised iron

B. Painted steel

C. Case hardened steel

D. Lead lined reactor

174. Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of ________________?
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A. Lead

B. Aluminium

C. Cloth

D. Paper

175. Current employed in resistance welding ranges from ____________________ kVA/cm2?
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A. 10.5 to 15.5

B. 7.5 to 8.5

C. 1.2 to 2.5

D. 4.5 to 6.2

176. Which of the following materials has the least scrap value ?
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A. Copper

B. Stainless steel

C. Aluminium

D. Brass

177. __________________ of air does not increase with increase in temperature?
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A. Viscosity

B. Thermal diffusivity

C. Density

D. Thermal conductivity

178. Fibre reinforced plastic (FRP) are___________________?
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A. Made of glass fibre and thermoplastic resins

B. Anisotropic

C. Made of thermosetting resin and glass fibre

D. Both B & C

179. Heating of ferromagnetic materials to a temperature above Curie temperature makes it ________________________?
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A. Insulator for heat & electricity transmission

B. Superconductor

C. Behave like paramagnetic materials

D. Ferritic

180. Which of the, following is not associated with the functioning of a petrol engine ?
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A. Spark plug

B. Otto cycle

C. Compression ignition system

D. Carburettor

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