MCQs

Chemical Engineering MCQs with Explanations

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2301Chemical EngineeringMedium

Nitric acid is produced on commercial scale in a fertilizer plant by________?

AOxidation of ammonia

BPassing air through high voltage electric arc

CCaNO3 + H2SO4 reaction

DNone of these

Correct answer

A. Oxidation of ammonia

Explanation

The correct answer is Oxidation of ammonia.

2302Chemical EngineeringMedium

Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________?

A> 100

B> 10

Correct answer

B. > 10

Explanation

The correct answer is > 10.

2303Chemical EngineeringMedium

Speed of sound in an ideal gas depends on its________?

ATemperature

BNone of these

CSpecific volume

DPressure

Correct answer

A. Temperature

Explanation

The correct answer is Temperature.

2304Chemical EngineeringMedium

Pick out the wrong statement?

AForced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger

BSherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number

CIn drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2

DHot gases at moderate pressure are usually in the shell side of shell and tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side

Correct answer

A. Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger

Explanation

The correct answer is Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger.

2305Chemical EngineeringMedium

Which of the following rock favors petroleum formation?

AIgneous rock

BMetamorphic rock

CNone of these

DSedimentary rock

Correct answer

D. Sedimentary rock

Explanation

The correct answer is Sedimentary rock.

2306Chemical EngineeringMedium

The biochemical treatment applied to sewage effluents is a process of________?

AOxidation

BReduction

CDehydration

DPolymerisation

Correct answer

A. Oxidation

Explanation

The correct answer is Oxidation.

2307Chemical EngineeringMedium

Conversion of silica mineral to Cristobalite is accompanied by reduction in its ________?

ABoth A. & B.

BVolume

CNeither A. nor B.

DSpecific gravity

Correct answer

D. Specific gravity

Explanation

The correct answer is Specific gravity.

2308Chemical EngineeringMedium

Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young’s modulus, G = Modulus of rigidity or shear modulus v = Poisson’s ratio)?

AE = 2G (1 + 2v)

BE = G (1 + v)

CE = G (1 + v)/2

DE = 2G (1 + v)

Correct answer

D. E = 2G (1 + v)

Explanation

The correct answer is E = 2G (1 + v).

2309Chemical EngineeringMedium

A metal ball of radius 0.1 m at a uniform temperature of 90°C is left in air at 30°C. The density and the specific heat of the metal are 3000 kg/m3 and 0.4 kJ/kg.K respectively. The heat transfer co-efficient is 50 W/m2.K Neglecting the temperature gradients inside the ball, the time taken (in hours) for the ball to cool to 60°C is________?

A55.5

B555

C0.15

D0.55

Correct answer

C. 0.15

Explanation

The correct answer is 0.15.

2310Chemical EngineeringMedium

“The total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes”. This is the ________ law?

ADalton’s

BAvogadro’s

CGay-Lussac’s

DAmagat’s

Correct answer

D. Amagat’s

Explanation

The correct answer is Amagat’s.

Pick out the wrong statement?

AForced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger

BSherwood number in mass transfer corresponds to Nusselt number in heat transfer and Schmidt number to Prandtl number

CIn drying a solid containing moisture above the critical moisture content the number of degrees of freedom is 2

DHot gases at moderate pressure are usually in the shell side of shell and tube heat exchangers. At higher pressure, however, it is customary to put gas in the tube side

Correct answer

A. Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger

Explanation

The correct answer is Forced convection is relatively more effective in increasing the rate of mass transfer, if Schmidt number is larger.