A. Increased economy (Correct)
B. Decreased economy
C. Lower capacity
D. No effect on economy
Chemical Engineering / Q&A
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always_________________?
A. Less than arithmetic mean value (Correct)
B. More than arithmetic mean value
C. More than geometric mean value
D. Both B. & C.
Raoult’s law states that ‘the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component’. This generalisation is based on the assumption that the________________?
A. Sizes of the component molecules are approximately equal
B. Attractive forces between like and unlike molecules are approximately equal
C. Component molecules are non-polar and no chemical combination or molecular association
between unlike molecules takes place in the formation of the solution
D. All A., B. & C. (Correct)
Which of the following is desirable in diesel and kerosene but is undesirable in gasoline ?
A. Aromatics (Correct)
B. Mercaptans
C. Paraffins
D. Naphthenic acid
The yield of straight run LPG from crude oil is about ______________ weight percent?
A. 20-25
B. 1-1.5 (Correct)
C. 10-15
D. 0.1-0.2
Which of the following is not concerned with the heat transfer ?
A. Brinkman number
B. Stanton number
C. Schmidt number (Correct)
D. Peclet number
Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around_______________?
A. 0.4-0.6
B. 0.35-0.75
C. 0.1-0.2 (Correct)
D. 0.55-0.85
Which of the following is a batch furnace ?
A. Cupola (Correct)
B. Reheating furnace
C. Glass tank furnace
D. None of these
Which of the following is a boiler accessory i.e., not a boiler mounting ?
A. Blow off cock
B. Feed check valve
C. Feed water pump (Correct)
D. Stop valve
Condenser tubes are not made of_________________?
A. Cartridge brass
B. Muntz brass
C. Wood metal (Correct)
D. Aluminium brass alloy