chemical engineering MCQs – Page 78

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 Review each marked answer and report any item that may be outdated or unclear.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
1541. Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is __________________?
comments icon0

A. A discontinuous reaction (requiring regeneration of iron by water gas intermittently)

B. Still in development stage (by employing fluidised bed technique)

C. All A , B. and C

D. A slow reaction

1542. Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the _____________ process?
comments icon0

A. Mechanical

B. Sulphate/Kraft

C. Neutral sulphite semi-chemical

D. Sulphite

1543. For the flow of gases through a capillary, with increase in temperature, the permeability __________________ as per Knudsen law?
comments icon0
A. Increases

B. Decreases

C. Either A. or B.; depends on the gas

D. Remain same

1544. The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is_____________________?
comments icon0
A. -ve

B. #NAME?

C. 0

D. ?

1545. Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the _______________ moisture?
comments icon0

A. Bound

B. Equilibrium

C. Free

D. Unbound

1546. Which of the following can be calculated theoretically using steam table and Daltons law of partial pressure; if the relative humidity and dry bulb temperature of moist air is known ?
comments icon0
A. Wet bulb temperature

B. Dew point

C. Humidity ratio

D. None of these

1547. Pick out the wrong statement. Generally for physical adsorption, a gas of________________?
comments icon0

A. High critical temperature is adsorbed in preference to a gas of low critical temperature

B. None of these

C. Higher molecular weight is adsorbed in preference to a gas of low molecular weight

D. Low volatility is adsorbed in preference to a gas of high volatility

1548. Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction__________________?
comments icon0

A. Increases with the increasing flake size keeping the flake thickness constant

B. Decreases with decrease of thickness of the flakes

C. Increases considerably with the rise of temperature

D. Decreases as the moisture content of flakes increases
1549. Vulcanisation of rubber____________________?
comments icon0

A. Increases its oil & solvent resistance

B. Decreases its tensile strength

C. Increases its ozone & oxygen reactivity

D. Converts its plasticity into elasticity
1550. During the constant rate period of drying of a solid ?
comments icon0

A. Increasing the air temperature decreases the drying rate

B. Surface evaporation of unbound moisture occurs

C. Increased air humidity decreases the rate of drying

D. None of these

1551. With increase in temperature, the leaching rate increases because of the _____________________?
comments icon0

A. Increased diffusivity

B. Decreased viscosity of liquid

C. Both A. and B.

D. Neither A. nor B.

1552. Margarine is a/an____________________?
comments icon0

A. Rocket propellant

B. Fat

C. Explosive

D. Plasticiser

1553. Dacron (or Terylene) fibres as compared to nylon fibres have__________________?
comments icon0

A. Better heat & acid resistant properties

B. Poorer dyeability

C. All A , B. and C.

D. Poorer resistance to alkalis

1554. Calculation of mass transfer co-efficient is mostly/normally done using ______________ theory?
comments icon0
A. Film

B. Surface renewal

C. None of these

D. Penetration

1555. Which one of the following devices is not used for both the absorption as well as the liquidliquid extraction processes ?
comments icon0

A. Packed towers

B. Wetted wall columns

C. Plate towers

D. Spray towers

1556. Permanent hardness of water is due to the presence of calcium & magnesium __________________?
comments icon0

A. Carbonate

B. Sulphates & chlorides

C. Bi-carbonates

D. None of these

1557. The major constituent of black liquor generated during paper manufacture is sodium___________________?
comments icon0

A. Sulphate

B. Bi-carbonate

C. Carbonate

D. Hydroxide

1558. Phthalic anhydride is produced by the oxidation of _________________?
comments icon0

A. Aniline

B. Benzene

C. Naphthalene

D. Toluene

1559. Most widely and commonly used coagulant for the removal of suspended impurities in water is __________________?
comments icon0

A. Copper sulphate

B. Slaked lime

C. Alum

D. Bleaching powder

1560. Glaubers salt is chemically represented by____________________?
comments icon0

A. CaCl(OCl)

B. Na2SO4.10H2O

C. CaSO4.H2O

D. (NH4)2SO4