Questions and answers for exam Preparation

MCQs

Total Questions : 2307 | Page 223 of 231 pages

Question 2221. In an ideal tubular-flow reactor_________________?

There is no mixing in longitudinal direction
Mixing takes place in radial direction
There is a uniform velocity across the radius
All A., B. and C.

Discuss Question

Answer: Option D. -> All A., B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2222. When a catalyst increases the rate of forward reaction, the value of rate constant__________________?

Increases
Decreases
Remain same
Becomes infinite

Discuss Question

Answer: Option A. -> Increases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2223. In a/an ______________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation?

Adiabatic
Isothermal
Non-adiabatic
None of these

Discuss Question

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

Question 2224. In flow reactors, the performance equations interrelate the rate of reaction to the___________________?

Feed rate
Reactor volume
Extent of reaction
All A., B. and C.

Discuss Question

Answer: Option D. -> All A., B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2225. When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is__________________?

Discuss Question

Answer: Option C. -> 1
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2226. For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1min-1. What will be the conversion for a PFR with a space velocity of 0.2 min-1? Assume that all the other operating conditions are the same for CSTR and PFR ?

0.15
0.30
0.60
0.90

Discuss Question

Answer: Option C. -> 0.60
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2227. The rate of a chemical reaction is almost doubled for every 10°C rise in temperature. The rate will increase ______________ times, if the temperature rises from 10 to 100°C?

Discuss Question

Answer: Option B. -> 512
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2228. A first order reaction requires two unequal sized CSTR. Which of the following gives higher yield ?

Large reactor followed by smaller one
Smaller reactor followed by larger one
Either of the arrangement A. or B. will give the same yield
Data insufficient, can’t be predicted

Discuss Question

Answer: Option C. -> Either of the arrangement A. or B. will give the same yield
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2229. For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a_________________?

Batch reactor is preferred over a single CSTR for high yield
Tubular reactor is preferred over a single CSTR for high yield
Both A. and B.
Single CSTR is the most suitable

Discuss Question

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

Question 2230. At a given temperature, K1, K2 and K3 are equilibrium constants for the following reactions 1, 2, 3 respectively. CH4(g) + H2O(g) ⇌ CO(g) + 3H2(g), CO(g) + H2O(g) ⇌ CO2(g) + H2(g) CH4(g) + 2H2O(g) ⇌ CO2(g) + 4H2(g) Then K1, K2 and K3 are related as ?