chemical engineering MCQs – Page 256

A. The aromatics have lower octane number than naphthenes with same number of carbon atoms

B. Branched chain paraffins have higher octane number than straight chain paraffins with same number of carbon atoms

C. Octane number of paraffins increases with increasing number of carbon atoms

A. Phenol & acetaldehyde

B. Urea & formaldehyde

D. Propylene

A. Ethyl chloride

B. Chloroform

D. Ethylene dichloride

A. Radioactive decay of fission products

B. Kinetic energy of neutrons

D. Instantaneous release of ?-rays

A. The relative volatility of a binary mixture at the Azeotropic composition is 1

B. For a non-reacting binary mixture of ideal gases, the partial pressure distribution of both

C. ponents is nonlinear in the case of steady state unimolal unidirectional diffusion

E. The mole fraction of solute is directly proportional to the molality of a dilute solution

B. nts) in froth floatation process

C. ter coal

D. Pine oil is used as a modifying agent (for activating or depressing the adsorption of filming

E. Angle of repose is always greater than the angle of slide

F. A silo is a short height vessel of very large diameter used for the storage of high volatile

A. Increased residence time results in the decreased severity of cracking

B. At low pressure, the yield of lighter hydrocarbons are more

D. Moderate changes in operating temperature does not change the depth of cracking

B. A dust catcher is simply an enlargement in a pipeline which permits the solids to settle down

C. Recycled coarse material to the grinder by a classifier is termed as circulating load

D. Wear and tear in wet crushing is more than that in dry crushing of materials

E. to reduction in velocity of the dust laden gas

A. Nylon

B. Polystyrene

D. None of these

A. Is less hard (in the range of silver)

C. Is highly ductile

D. Resembles steel in appearance

A. In a first order reaction, A ? products; the reaction becomes slower as it proceeds, because

B. concentration of A decreases and the rate is proportional to the concentration of A

C. mentary

D. If the rate of an irreversible reaction, A + B ? 2C is k.CA.CB, then the reaction is always

E. Transition state theory approaches the problem of calculating reaction rates by concentrating

F. the idea of activated complexes

B. Pentogens

C. Lignin

D. Cellulose

A. Natural rubber

B. Unvulcanised raw rubber

D. Adhesive

A. None of these

C. Of the same monomer by elimination of small molecules of water

D. With the elimination of small amount of water

A. Speed of ?-rays is more than that of ?-rays

B. In ?-decay, the ratio of neutron to proton decreases

C. Ionising power of ?-rays is higher than that of ?-rays

A. The absence of chlorine atoms in its monomer

B. Its linear chain structure

D. Its cross-linked structure

B. 4-Jan

C. 2-Jan

D. 8-Jan

B. cumulative analysis unlike differential analysis

C. A gate diagram is a plot of cumulative percent by weight undersize vs. the reciprocal of

D. meter, in which the area beneath the curve represents the surface

E. throwing of the balls through the air to the toe of the heap is called cataracting

F. Cumulative analysis for determining surface area is preferred over differential analysis,

A. Inverse square

C. Linear

D. Logarithmic

A. Distributed parameter approach gives partial differential equation

B. Proportional controller is normally used for level control in industrial applications

D. Non-linear behaviour is exemplified by an on-off controller