chemical engineering MCQs – Page 158

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 Review each marked answer and report any item that may be outdated or unclear.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

3141. Most commonly used crude heater before the fractionation tower in a refinery is the ______________ heater?
0

A. Electric immersion

B. Pipestill

C. None of these

D. Steam coil

3142. What is the dispersion number for a plug flow reactor ?
0

A. -1

B. 0

C. ?

D. 1

3143. For a vapour phase catalytic reaction (A + B ? P) which follows the Ridel mechanism and the reaction step is rate controlling, the rate of reaction is given by (reaction rate is irreversible, product also absorbs) ?
0

A. -rA = (k . PA

B. #8211; k1PP)/(1 + KAPA + KPPP)

C. -rA = (k . PA . PB)/(1 + KAPB + KBPB . KPPP)

D. -rA = (k . PA . PB)/(1 + KAPA)

E. -rA = (k . PA . PB)/(1 + KAPA + KPPP)

3144. For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the ______________ adsorption?
0

A. Physical

B. Chemical

C. Both A. and B.

D. Neither A. nor B.

3145. Which of the following has the highest flash point of all ?
0

A. Petrol

B. Furnace oil

C. Diesel

D. Kerosene

3146. Which of the following fractions of petroleum contains maximum sulphur ?
0

A. Gasoline

B. Atmospheric residue

C. Naphtha

D. Diesel

3147. Second order consecutive irreversible reaction as shown in the bellow figure, were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k1/k2) ?
0

A. 1/4

B. 2

C. 2-Jan

D. 4

3148. Ionic reactions occur in____________________?
0

A. Any state

B. Liquid state only

C. Solid state only

D. Solutions

3149. The most widely used crude topping column in refineries is the ______________ column?
0

A. Bubble-cap

B. Fluidised bed

C. Perforated plate

D. Packed bed

3150. Pick out the wrong statement about the smoking tendency of various hydrocarbon constituents of kerosene ?
0

A. Smoking tendency of aromatics decreases with increase in its molecular weight

B. Smoking tendency of naphthenes decreases with its increasing molecular weight & also on

C. Smoking tendency of hydrocarbons increases in the order: paraffins ? isoparaffins ?

D. ition of double bond

E. hthenes ? aromatics

F. Smoking tendency of paraffins increases with decrease in its molecular weight

3151. Carbon percentage (by weight) in crude petroleum may be about_________________?
0

A. 65

B. 95

C. 85

D. 75

3152. With increase in temperature, the equilibrium _______________ rises in case of endothermic reaction?
0

A. Constant

B. Conversion

C. Both A. & B.

D. Neither A. nor B.

3153. The experimentally determined overall order of the reaction, A + B ? C + D, is two. Then the__________________?
0

A. Reaction may be elementary with molecularity of 2

B. Reaction is elementary with a molecularity of 2

C. Reaction is elementary but the molecularity may not be 2

D. Molecularity of the reaction is 2, but the reaction may not be elementary

3154. For an ideal plug flow reactor, the value of Peclet number is_______________?
0

A. 10

B. 0

C. 1

D. ?

3155. A Catalyst ____________________?
0

A. Increases the equilibrium concentration of the product

B. Shortens the time to reach the equilibrium

C. Changes the equilibrium constant of the reaction

D. None of these

3156. Mercaptans is represented as (where R and R are alkyl groups) _____________________?
0

A. R-S-R

B. R-COOH

C. R-S-R

D. R-S-H

3157. Gasoline extracted from natural gas (by compression and cooling) is called the ___________ gasoline?
0

A. Polymer

B. Casing head

C. Unleaded

D. Straight run

3158. The main use of heavy gas oil produced by the vacuum distillation unit is as a_____________________?
0

A. Feedstock for fluid catalytic cracking unit

B. Blending component for kerosene

C. Blending component for petrol

D. None of these

3159. BET apparatus_______________________?
0

A. None of these

B. Operates at very high pressure

C. Measures the catalyst surface area directly

D. Is made entirely of stainless steel

3160. The reactions of high molecularity are rare, because________________?
0

A. Of very large activation energy of many bodies

B. Of low probability of many body collisions

C. Many body collisions are not favoured energetically

D. Of requirement of very large concentration for such reactions

Previous Next

Showing 3141 to 3160 of 8709 mcqs