chemical engineering MCQs – Page 221

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

4401. The unit of dynamic viscosity is_________________?
0

A. Stoke

B. Poise

C. gm/cm sec

D. Both B. & C.

4402. Roof of a basic electric furnace is made of ______________ bricks?
0

A. Superduty fireclay

B. Chromite

C. Silica

D. None of these

4403. A solution with reasonably permanent pH is called a/an _______________ solution?
0

A. Buffer

B. Non-ideal

C. Colloidal

D. Ideal

4404. Pick out the correct statement ?
0

A. In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity

B. 1 kcal/hr.m.C is equal to 1 BTU/hr. ft.F

C. In heat transfer by forced convection, Grashoff number is very important

D. In unsteady state heat conduction, heat flows in the direction of temperature rise

4405. Removal of ______________ heat is involved in the condensation of a vapor under saturated conditions?
0

A. Super

B. Sensible

C. Latent

D. Both B. & C.

4406. A vapor that exists above its critical temperature is termed as a _____________ vapor?
0

A. Gaseous

B. Unsaturated

C. Sub-cooled

D. Saturated

4407. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3. The diffusivity of aniline in air is 0.74 10-5m2/s. The numerical value of mass transfer co-efficient is 7.4 10-3. Its units are_______________________?
0

A. k.mole/m2.s.Pa

B. mole/m2.s.Pa

C. m/s

D. cm/s

4408. The value of the gas-law constant R is 1.987 ?
0

A. kcal/kg-mole.C

B. Btu/lb-mole.R

C. kcal/kg-mole.K

D. Both B. & C.

4409. Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is __________________?
0

A. In the central core of the fluid

B. Uniformly distributed throughout the fluid

C. Mainly confined to a thin film of fluid near the surface

D. None of these

4410. Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
0

A. Dittus-Boelter equation

B. Sieder-Tate equation

C. Nusselt equation

D. None of these

4411. Refractoriness/fusion points of Superduty refractories is _____________ C?
0

A. 1520-1630

B. > 1730

C. 1630-1670

D. > 2000

4412. Thermal diffusivity of a refractory brick is high, when its ______________ is high?
0

A. Thermal conductivity

B. Density

C. None of these

D. Specific heat

4413. Pick out the wrong statement ?
0

A. For all the cylindrical process vessels operating above atmospheric pressure, formed heads are used for closing the vessel

B. Fouling factor of river water is less than that of sea water

C. Risers provided in bubble cap trays in the distillation column facilitate the flow of both liquid and vapor

D. Both B. and C.

4414. The heats of vaporisation of CS2, C2H5OH &H2O are 26.8, 38.6 & 40.6 KJ/kg.mole respectively. The order of decreasing inter-molecular forces in these liquids is________________?
0

A. CS2 > C2H5OH > H2O

B. H2O > C2H5OH > CS2

C. H2O > CS2 > C2H5OH

D. CS2 > H2O > C2H5OH

4415. The reaction A + B ? C has been conducted in a reactor as shown below. The number of boundaries around which material balance can be written, are_________________?
0

A. 1

B. 4

C. 6

D. 3

4416. Vibrations in the tubes of a shell and tube heat exchanger is induced due to the _________________?
0

A. Flow of fluid on the tube and shell sides

B. Oscillations in the flow of shell/tube sides fluid

C. All A., B. and C.

D. Vibrations transmitted through piping and/or supports due to external reasons

4417. Heat waves_____________________?
0

A. Cannot pass through vacuum

B. Travel in straight line

C. Can be reflected by a mirror

D. Both B. and C.

4418. Which form of silica has the highest specific gravity ?
0

A. Cristobalite

B. All have the same specific gravity

C. Quartz

D. Tridymite

4419. During a phase change process like sublimation, vaporisation, melting etc., the specific ____________ does not change?
0

A. Gibbs free energy

B. Enthalpy

C. Entropy

D. Internal energy

4420. The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg ?
0

A. 0.4

B. 0.6

C. 0.1

D. 0.2

Previous Next

Showing 4401 to 4420 of 8709 mcqs