MCQs

Chemical Engineering MCQs with Explanations

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3691Chemical EngineeringMedium

Iron rust is________?

AFerric sulphide

BFerrous oxide

CHydrated ferric oxide

DPowdered iron

Correct answer

C. Hydrated ferric oxide

Explanation

The correct answer is Hydrated ferric oxide.

3692Chemical EngineeringMedium

For a first order chemical reaction in a porous catalyst, the Thiele modulus is 10. The effectiveness factor is approximately equal to ________?

A0.1

C0.5

Correct answer

A. 0.1

Explanation

The correct answer is 0.1.

3693Chemical EngineeringMedium

Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is ________?

AStill in development stage (by employing fluidised bed technique)

BA slow reaction

CA discontinuous reaction (requiring regeneration of iron by water gas intermittently)

DAll A, B. and C

Correct answer

D. All A, B. and C

Explanation

The correct answer is All A, B. and C.

3694Chemical EngineeringMedium

Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2/sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec. V = volume, cm3.)?

AReactor dispersion number (D/vL)

BNone of these

CReduced time (vt/V)

DThiele modulus L √(k/D1)

Correct answer

B. None of these

Explanation

The correct answer is None of these.

3695Chemical EngineeringMedium

Ratio of primary air to secondary air increases with increase in the rank of coal, because the________?

ARatio of fixed carbon to volatile matter increases

BCalorific value of the coal increases

CHigh rank coals have higher amount of volatile matter

DOxygen content progressively decreases

Correct answer

A. Ratio of fixed carbon to volatile matter increases

Explanation

The correct answer is Ratio of fixed carbon to volatile matter increases.

3696Chemical EngineeringMedium

Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about ________ mm Hg absolute?

A30 to 80

B1 to 5

C250 to 350

D450 to 500

Correct answer

A. 30 to 80

Explanation

The correct answer is 30 to 80.

3697Chemical EngineeringMedium

In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible ________ process?

AAdiabatic

BIsothermal

CIsometric

DIsentropic

Correct answer

C. Isometric

Explanation

The correct answer is Isometric.

3698Chemical EngineeringMedium

Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill.)?

A1/D

BD2.5

C1/D2.5

Correct answer

B. D2.5

Explanation

The correct answer is D2.5.

3699Chemical EngineeringMedium

Which of the following is not a dimension-less parameter?

AFroude number

BPressure-co-efficient

CWeber number

DKinematic viscosity

Correct answer

D. Kinematic viscosity

Explanation

The correct answer is Kinematic viscosity.

3700Chemical EngineeringMedium

Pour point of a petrofuel is________?

A5°C below the temperature at which oil ceases to flow

BMultiple of 5°F

CNone of these

DMultiple of 3°F

Correct answer

A. 5°C below the temperature at which oil ceases to flow

Explanation

The correct answer is 5°C below the temperature at which oil ceases to flow.

Ratio of primary air to secondary air increases with increase in the rank of coal, because the________?

ARatio of fixed carbon to volatile matter increases

BCalorific value of the coal increases

CHigh rank coals have higher amount of volatile matter

DOxygen content progressively decreases

Correct answer

A. Ratio of fixed carbon to volatile matter increases

Explanation

The correct answer is Ratio of fixed carbon to volatile matter increases.