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Chemical Engineering MCQs with Explanations

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41Chemical EngineeringMedium

A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________?

A-136.5°C

B-136.5°K

C0°K

D0°C

Correct answer

A. -136.5°C

Explanation

The correct answer is -136.5°C.

42Chemical EngineeringMedium

Poly-methyl-methacrylate, which is an acrylic resin, is also called ________?

AThiokol

BTeflon

CDacron

DPlexiglass or Lucite

Correct answer

D. Plexiglass or Lucite

Explanation

The correct answer is Plexiglass or Lucite.

43Chemical EngineeringMedium

Which of the following thermometers is not suitable for distant reading upto 60 metres?

AMercury in glass thermometer

BResistance thermometer

CVapor pressure thermometer

DConstant volume gas thermometer

Correct answer

A. Mercury in glass thermometer

Explanation

The correct answer is Mercury in glass thermometer.

44Chemical EngineeringMedium

The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at, where, K is the thermal conductivity and T is the temperature (in °K). The units of ‘a’ in SI system will be________?

ANone, ‘a’ is just a number

BW/m.k

CW/m.k2

DW/m

Correct answer

C. W/m.k2

Explanation

The correct answer is W/m.k2.

45Chemical EngineeringMedium

Nylon-6 as compared to nylon-66 is________?

AHaving higher melting point

BMore abrasion resistant

CNone of these

DHarder

Correct answer

C. None of these

Explanation

The correct answer is None of these.

46Chemical EngineeringMedium

Porosity is induced in insulating refractories by adding________?

AAmmonium chloride/sulphate

BCalcium phosphate

CAll A., B. and C.

DPowdered naphthalene

Correct answer

C. All A., B. and C.

Explanation

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

47Chemical EngineeringMedium

‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a________?

ANon-dimensional factor

BConversion factor for individual film heat transfer co-efficient to overall heat transfer coefficient

CNone of these

DFactor of safety

Correct answer

D. Factor of safety

Explanation

The correct answer is Factor of safety.

48Chemical EngineeringMedium

On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the ________ of the input signal?

AFrequency

BNone of these

CAmplitude

DDamping

Correct answer

A. Frequency

Explanation

The correct answer is Frequency.

49Chemical EngineeringMedium

All the atoms of the world comprise of electrons, proton & neutron except that of ________ atom in which neutron is absent?

ANeon

BHydrogen

CDeuterium

DHelium

Correct answer

B. Hydrogen

Explanation

The correct answer is Hydrogen.

50Chemical EngineeringMedium

Smoke point of a test sample of kerosene is found to be 15 mm. On removal of ________ from it, the smoke point rises to 25 mm?

AOlefins

Bn-paraffins

CAromatics

DNone of these

Correct answer

C. Aromatics

Explanation

The correct answer is Aromatics.

41Chemical EngineeringMedium

A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________?

A-136.5°C

B-136.5°K

C0°K

D0°C

Correct answer

A. -136.5°C

Explanation

The correct answer is -136.5°C.

42Chemical EngineeringMedium

Poly-methyl-methacrylate, which is an acrylic resin, is also called ________?

AThiokol

BTeflon

CDacron

DPlexiglass or Lucite

Correct answer

D. Plexiglass or Lucite

Explanation

The correct answer is Plexiglass or Lucite.

43Chemical EngineeringMedium

Which of the following thermometers is not suitable for distant reading upto 60 metres?

AMercury in glass thermometer

BResistance thermometer

CVapor pressure thermometer

DConstant volume gas thermometer

Correct answer

A. Mercury in glass thermometer

Explanation

The correct answer is Mercury in glass thermometer.

44Chemical EngineeringMedium

The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at, where, K is the thermal conductivity and T is the temperature (in °K). The units of ‘a’ in SI system will be________?

ANone, ‘a’ is just a number

BW/m.k

CW/m.k2

DW/m

Correct answer

C. W/m.k2

Explanation

The correct answer is W/m.k2.

45Chemical EngineeringMedium

Nylon-6 as compared to nylon-66 is________?

AHaving higher melting point

BMore abrasion resistant

CNone of these

DHarder

Correct answer

C. None of these

Explanation

The correct answer is None of these.

46Chemical EngineeringMedium

Porosity is induced in insulating refractories by adding________?

AAmmonium chloride/sulphate

BCalcium phosphate

CAll A., B. and C.

DPowdered naphthalene

Correct answer

C. All A., B. and C.

Explanation

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

47Chemical EngineeringMedium

‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a________?

ANon-dimensional factor

BConversion factor for individual film heat transfer co-efficient to overall heat transfer coefficient

CNone of these

DFactor of safety

Correct answer

D. Factor of safety

Explanation

The correct answer is Factor of safety.

48Chemical EngineeringMedium

On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the ________ of the input signal?

AFrequency

BNone of these

CAmplitude

DDamping

Correct answer

A. Frequency

Explanation

The correct answer is Frequency.

49Chemical EngineeringMedium

All the atoms of the world comprise of electrons, proton & neutron except that of ________ atom in which neutron is absent?

ANeon

BHydrogen

CDeuterium

DHelium

Correct answer

B. Hydrogen

Explanation

The correct answer is Hydrogen.

50Chemical EngineeringMedium

Smoke point of a test sample of kerosene is found to be 15 mm. On removal of ________ from it, the smoke point rises to 25 mm?

AOlefins

Bn-paraffins

CAromatics

DNone of these

Correct answer

C. Aromatics

Explanation

The correct answer is Aromatics.