Questions and answers for exam Preparation

MCQs

Total Questions : 2307 | Page 226 of 231 pages

Question 2251. The single parameter model proposed for describing non-ideal flow is the ____________ model?

Tank in series
Dispersion
Both A. & B.
Neither A. nor B.

Discuss Question

Answer: Option C. -> Both A. & B.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2252. A reversible liquid phase endothermic reaction is to be carried out in a plug flow reactor. For minimum reactor volume, it should be operated such that the temperature along the length ?

Decreases
Increases
Is at the highest allowable temperature throughout
First increases and then decreases

Discuss Question

Answer: Option C. -> Is at the highest allowable temperature throughout
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2253. A batch reactor is_______________?

Suitable for gas-phase reactions on commercial scale
Suitable for liquid phase reactions involving small production rate
Least expensive to operate for a given rate
Most suitable for very large production rate

Discuss Question

Answer: Option B. -> Suitable for liquid phase reactions involving small production rate
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2254. Sometimes, batch process is preferred over continuous process, when the product___________________?

Quality & yield cannot be achieved in continuous processes, because of long residence time
Sales demand is fluctuating
Both A. & B.
Neither A. nor B.

Discuss Question

Answer: Option C. -> Both A. & B.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2255. For high conversion in a highly exothermic solid catalysed reaction, use a ______________ bed reactor?

Fixed
Fluidised bed reactor followed by a fixed
Fixed bed reactor followed by a fluidised
Fluidised

Discuss Question

Answer: Option B. -> Fluidised bed reactor followed by a fixed
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2256. A photochemical reaction is _______________?

Accompanied with emission of light
Catalysed by light
Initiated by light
All A., B. & C.

Discuss Question

Answer: Option C. -> Initiated by light
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2257. For an isothermal second order aqueous phase reaction, A → B, the ratio of the time required for 90% conversion to the time required for 45% conversion is____________________?

Discuss Question

Answer: Option C. -> 11
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2258. In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3), the value of the equilibrium constant depends on the_________________?

Total pressure of the system
Volume of the reactor
Temperature
Initial concentration of N2 and H2

Discuss Question

Answer: Option C. -> Temperature
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2259. For a heterogeneous catalytic reaction____________________?

Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction
A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is importa
The catalyst does not form an intermediate complex with the reactant
The surface of the catalyst does not play an important role during reaction

Discuss Question

Answer: Option A. -> Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2260. Reaction rate equation for the bellow figure reaction, If S at is present in large excess, what is the order of this reaction ?