Chemical Engineering Archives

7791. For identical flow rate, feed composition and for elementary first order reactions, ‘N’ equal sized mixed reactors in series with a total volume ‘V’ gives the same conversion as a single plug flow reactor of volume ‘V’ for constant density systems. This is true, when the value of ‘N’ is

∞

≥1

✅ The correct answer is option C.

7792. __________ is the controlling step in a highly temperature sensitive fluid-solid non-catalytic reaction.

Gas film diffusion

Ash diffusion

Chemical reaction

None of these

✅ The correct answer is option C.

7793. Which of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?

Ash resistance

Gas film and pore surface diffusion resistances for reactants

Surface phenomenon resistance

Gas film and pore surface diffusion resistances for products

✅ The correct answer is option A.

7794. With increase in initial concentration, the fractional conversion of a first order reaction in a given time

Increases

Decreases

Remains constant

Unpredictable

✅ The correct answer is option C.

7795. Carrier in a catalyst increases its

Surface area

Activity

Performance

None of these

✅ The correct answer is option A.

7796. A balanced chemical reaction equation conforms to the law of

Conservation of mass

Avagadro’s hypothesis

Gaseous volumes

None ofthese

✅ The correct answer is option A.

7797. Pick out the wrong statement pertaining to space velocity of flow reactors.

The unit of space velocity is (time)⁻¹

The space velocity of 3 hr⁻¹ means that three reactor volumes of feed at specified conditions are being fed into the reactor every hour

The space velocity of 3 hr⁻¹ means that one third reactor volume of feed at specified conditions are being fed into the reactor

None of these

✅ The correct answer is option C.

7798. __________ gas is normally employed in B.E.T.method of finding out the surface area of catalyst.

N₂

H₂

CO₂

✅ The correct answer is option A.

7799. The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is

Backmix reactor

Plug flow reactor

Series of CSTR

PFR in series

✅ The correct answer is option A.

7800. The following gas phase reactions are carried out isothermally in a CSTR. A → 2R ; r₁ = K₁pA ; K₁ = 20mole/(sec.m³ bar) A → 3S ; r₂ = K₂ pA ; K₂ = 40mole/ (sec.m³ .bar) What is the maximum possible value of FR(mole/sec.) ?

1-Mar

1-Feb

2-Mar

✅ The correct answer is option C.