Multiple Choice Questions & Answers on APSC Chemical Engineering Optional

31 Which is not a dimensionless parameter?

1 Reynolds number

2 Froude number

3 Atomic number

4 Mach number

View Answer

Answer: Atomic number

32 The concept of boundary layer that provides important links between ideal-fluid flow and real-fluid flow

1 Reynolds

2 Prandtl

3 Mach

4 Hagen

View Answer

Answer: Prandtl

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33 As per classification of materials, 'fiber glass' may be classified under

1 metals

2 ceramics

3 composites

4 polymers

View Answer

Answer: composites

34 The volume of atoms in a unit cell divided by total volume of the unit cell is known as

1 atomic number

2 atomic packing factor

3 coordination number

4 crystal index

View Answer

Answer: atomic packing factor

35 Which among the following is not a carbon polymorph?

1 Diamond

2 Pearl

3 Graphite

4 Fullerene

View Answer

Answer: Pearl

36 Perspex is was given by

1 Aciylic sheet

2 an elastomer

3 an alloy of tin and lead

4 an aluminium foil clad with bakelite

View Answer

Answer: Aciylic sheet

37 Atmospheric corrosion of metals results from their

1 slow oxidation

2 fast oxidation

3 fast hydration

4 slow hydration

View Answer

Answer: slow oxidation

38 Boiler feed-water is treated to prevent

1 scaling and corrosion

2 foaming and priming

3 Both (A) and (B)

4 Neither (A) nor (B)

View Answer

Answer: Both (A) and (B)

39 Which of the following is not a renewable energy?

1 Solar energy

2 Wind energy

3 Nuclear energy

4 Geothermal energy

View Answer

Answer: Nuclear energy

40 Glass is corroded by

1 fluorine (dry or wet)

2 H2S04

3 H3P04

4 None of the above

View Answer

Answer: fluorine (dry or wet)

41 Which of the following produces maximum pressure difference for transportation of gases?

1 Vacuum pump

2 Blower

3 Fan

4 Compressor

View Answer

Answer: Compressor

42 The number of gram equivalent of solute dissolved in one litre of solution is called its

1 normality

2 molarity

3 molality

4 None of the above

View Answer

Answer: normality

43 Rubber-lined pumps can be used to pump

1 caustic soda

2 chlorinated brine

3 hypochloric acid

4 All of the above

View Answer

Answer: All of the above

44 In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by

1 cuprous chloride

2 potassium hydroxide

3 alkaline pyrogallol solution

4 Non of the above

View Answer

Answer: cuprous chloride

45 Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of

1 less air for combustion

2 correct amount of air for combustion

3 too much air for combustion

4 pulverised coal in boilers

View Answer

Answer: too much air for combustion

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