chemical engineering chemical engineering basics MCQs – Page 8

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 Review each marked answer and report any item that may be outdated or unclear.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

141. For separating small pieces of metal from engine oil of a car, the best separating technique is the _____________________ ?
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A. Evaporation

B. Fractional distillation

C. Chromatography

D. Filtration

142. The minimum and the maximum number of members required to form a Private Limited Joint Stock Company are respectively __________________?
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A. 10 and 50

B. 7 and 30

C. 13 and 55

D. 2 and 50

143. Which of the following equipments is used for liquid dispersion ?
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A. Bubble cap plate column

B. Wetted wall column

C. Venturi scrubber

D. Packed column

144. Colour comparator is used to measure the___________________?
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A. Colour intensity

B. None of these

C. pH value

D. Electrode potential

145. Ammonia leakage in the refrigeration system is detected by_________________?
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A. Soap solution

B. Using chemical reagents

C. Its smell

D. Sulphur stick, which on detection gives white smoke

146. Tumbling is the process of improving the ________________ of the materials/parts ?
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A. Surface finish

B. Fatigue limit

C. Surface cleanliness

D. Creep limit

147. __________________ of air does not increase with increase in temperature?
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A. Thermal diffusivity

B. Viscosity

C. Thermal conductivity

D. Density

148. Silicon in steel__________________?
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A. All A, B & C

B. Makes it usable in almost all magnetic circuits where alternating current is used

C. Is present upto 5% & 4% respectively when used in transformers & motor armatures

D. Increases its electrical resistivity and decreases the hysteresis loss

149. The highest stress that a material can withstand for a specified length of time without excessive deformation is called the ____________ strength ?
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A. Endurance

B. Fatigue

C. None of these

D. Creep

150. The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of ______________ mm ?
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A. 0.001

B. 0.02

C. 0.01

D. 0.002

151. Which of the following low melting alloy containing bismuth and lead is used for electric fuse ?
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A. Babbitt metal

B. Monel metal

C. Woods metal

D. Duralumin

152. Out of the following, which will fracture most readity, when hit with a hard hammer ?
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A. German silver

B. Brass

C. Cast iron

D. Bronze

153. The noble metals________________?
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A. Do not resist corrosion very strongly

B. Are the lowermost in the electro-chemical series of metals

C. Are exemplified by Na, K and Li

D. None of these

154. Shampoos are commercially not available in the form of ___________________?
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A. Emulsion

B. Powder

C. Solution

D. Gaseous mixture

155. Percentage of differential pressure lost in a Venturimeter with a tapering of 15 may be about___________________?
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A. 1

B. 25

C. 50

D. 10

156. The boiling & freezing points on a newly defined temperature scale in degree D are 400D & 100D respectively. The temperature reading corresponding to 60C on this new temperature scale will be equal to _____________ D ?
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A. 140

B. 180

C. 240

D. 280

157. Which of the following metals reacts violently with water ?
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A. Magnesium

B. Sodium

C. Mercury

D. Calcium

158. The specific gravity of coal depends mainly on its __________________ content ?
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A. Ash

B. Carbon

C. Volatile matter

D. Moisture

159. Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are____________________?
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A. Tungsten, chromium & cobalt

B. Tungsten, molybdenum & nickel

C. Manganese, chromium & cobalt

D. Nickel, cobalt & chromium

160. Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank) ?
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A. H/2

B. H/4

C. H

D. H/6

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