chemical engineering MCQs – Page 82

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 Review each marked answer and report any item that may be outdated or unclear.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
1621. A bio-catalyst produced by living cells which acts independent of the cell is called a/an_______________?
comments icon0

A. Substrate

B. None of these

C. Enzyme

D. Nutrient

1622. Potassium is kept & transported under ___________________ ?
comments icon0

A. Liquid ammonia

B. Water

C. Alcohol

D. Kerosene oil
1623. In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be___________________?
comments icon0

A. 2 metres above the ground

B. At ground level

C. 5 metres above ground

D. 10 metres above ground

1624. When an unsaturated air-water mixture is heated at constant pressure, then ____________________ ?
comments icon0

A. The relative humidity increases

B. The relative humidity decreases

C. The partial pressure of water vapour increases

D. The specific humidity decreases

1625. Parathion and Malathion are _____________________?
comments icon0

A. Pain-relieving drugs (analgesic)

B. Plasticisers for unsaturated polyesters

C. Tranquilisers

D. Pesticides
1626. Pressure drop through plate tower as compared to that through packed tower, for the same duty will be___________________?
comments icon0

A. Either A. or B.; depends on the packing height

B. Less

C. More

D. Equal

1627. Electric bulbs are made of _______________ glass ?
comments icon0

A. Jena

B. Crookes

C. Pyrex

D. Flint
1628. Pore size of the molecular sieve 5A is ____________________ mm ?
comments icon0

A. 50

B. 0.05

C. 5

D. 0.5
1629. Drying of a solid involves _________________ transfer ?
comments icon0

A. Only heat

B. Only mass

C. Both heat and mass

D. None of these

1630. Hydrogenation of vegetable oils is a/an _______________ reaction ?
comments icon0

A. Autocatalytic

B. Homogenous

C. Endothermic

D. Exothermic
1631. For stripping of a gas in a counter current stripper, the operating line _____________________?
comments icon0

A. Lies above the equilibrium curve

B. Can lie above or below the equilibrium curve

C. Lies below the equilibrium curve

D. Is always parallel to the equilibrium curve

1632. Use of hydrated lime in water treatment_________________?
comments icon0

A. Before filtration, reduces the bacterial load on filters

B. After filtration, combats the corrosiveness of water due to the presence of O2 & CO2

C. All A , B. and C.

D. Is to adjust the pH value

1633. In extraction, as the temperature increases, the area of heterogeneity (area covered by binodal curve)____________________?
comments icon0

A. None of these

B. Decreases

C. Increases

D. Remains unchanged

1634. Sulphuric acid is mainly used in the _______________ industry ?
comments icon0
A. Fertiliser

B. Steel

C. Paint

D. Paper

1635. Reboiler is considered as one theoretical plate, because_____________________?
comments icon0

A. Vapour is recycled to the column

B. Reboiler itself contains one plate

C. Of the assumption that vapour and liquid leaving the reboiler are in equilibrium

D. None of these

1636. In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed____________________?
comments icon0
A. q = 1

B. q > 1

C. q = 0

D. q < 1

1637. Laboratory determination of the diffusivity of vapor is done by ______________ method?
comments icon0

A. Wikes

B. Gillilands

C. Wetted wall column

D. Winkelmanns
1638. Large quantity of silica gel is normally dried in a _________________ dryer?
comments icon0

A. Rotary vacuum

B. Through circulation

C. Freeze

D. Tray

1639. The minimum liquid rate to be used in an absorber corresponds to an operating line__________________?
comments icon0

A. Of slope = 1

B. Tangential to the equilibrium curve

C. Of slope = 0.1

D. None of these

1640. The individual mass transfer co-efficients (moles/m2s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?
comments icon0

A. Liquid side

B. Gas side

C. Interfacial

D. Both liquid and gas side