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Important Questions & Answers on Chemical Engineering Optional Paper for APSC(Assam Public Service Commission) Prelims | GkSeries

1 Which of the following is a unit operation?
1 Sublimation
2 Sulphonation
3 Pyrolysis
4 Hydrolysis

Answer: Sublimation
2 Which of the following is not equivalent to standard atmospheric pressure?
1 1 01325 Pa
2 10135 bar
3 760 mm Hg
4 1-01325 x 10s N/m2

Answer: 1 01325 Pa
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3 One mole of a compound contains
1 one molecule of the substance
2 one atom of the substance
3 6 023 x 1023 molecules
4 22-4 x 103 molecules

Answer: 6 023 x 1023 molecules
4 Shear stress in a fluid flowing in a round pipe
1 varies parabolically across the cross-section
2 remains constant over the cross-section
3 is zero at the centre and varies linearly with radius
4 is zero at the wall and increases linearly to the centre

Answer: is zero at the centre and varies linearly with radius
5 With increase in the temperature, viscosity of a liquid
1 increases
2 decreases
3 remains constant
4 None of the above

Answer: decreases
6 Hydraulic radius is the ratio of
1 wetted perimeter to flow area
2 flow area to wetted perimeter
3 flow area to square of wetted perimeter
4 square root of flow area to wetted perimeter

Answer: flow area to wetted perimeter
7 is valid for Re
1 turbulent flow
2 laminar flow through an open channel
3 steady flow
4 None of the above

Answer: laminar flow through an open channel
8 Limiting reactant for a chemical equation is the reactant that is
1 present in excess of the stoichiometric amount
2 present exactly as per stoichiometric amount
3 present in the smallest stoichiometric amount
4 not having any relation with stoichiometiy

Answer: present in the smallest stoichiometric amount
9 When chemical reaction occurs in a process, then usually the number of independent material balances and the number of atomic species
1 is different
2 is equal
3 may or may not matter
4 is irrelevant

Answer: is equal
10 The amount of air or oxygen required for bringing a process into complete combustion is called
1 theoretical air or oxygen
2 excess air or oxygen
3 practical requirement
4 None of the above

Answer: theoretical air or oxygen
11 With rise in temperature, the heat capacity of a substance
1 increases
2 decreases
3 remains unchanged
4 either (A) or (B) depends on the substance

Answer: increases
12 A stream bled off to remove an accumulation of inerts or unwanted material in the process is called
1 bypass stream
2 purge stream
3 recycle stream
4 process stream

Answer: purge stream
13 In general, a gas that exists below its critical temperature is called
1 a critical gas
2 a condensate
3 a vapour
4 a smoke

Answer: a vapour
14 Gibbs' phase rule is given by
1 F+C=P+ 2
2 F-C=P-2
3 F = C+ P + 2
4 F = C- P + 2

Answer: F = C- P + 2
15 The forces acting on a particle settling in a fluid are
1 gravitational and buoyant forces
2 centrifugal and drag forces
3 gravitational or centrifugal, buoyant and drag forces
4 external, drag and viscous forces

Answer: gravitational or centrifugal, buoyant and drag forces

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