chemical engineering MCQs – Page 195

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 Review each marked answer and report any item that may be outdated or unclear.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

3881. What is the unit of thermal conductivity ?
0

A. Kcal/hr.m.C

B. Kcal/hr.m

C. Kcal/hr. C

D. Kcal/hr. m2 C

3882. The wall thickness of thin cylindrical shell with hemispherical ends is ______________ that of the spherical ends?
0

A. Less than

B. Either B. or C.; depends on maximum permissible internal pressure

C. Equal to

D. More than

3883. Stefans block body radiation law can also be derived from ______________ law?
0

A. None of these

B. Fouriers

C. Plancks

D. Kirchoffs

3884. Fqra cold viscous feed, backward feed gives _____________ than forward feed?
0

A. None of these

B. Lower economy

C. A lower capacity

D. A higher capacity

3885. The inner wall of a furnace is at a temperature of 700C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.C- 1 respectively. The ambient air is at 30C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.C-1. The rate of heat loss from the outer surface in W.m-2is__________________?
0

A. 175

B. 167.5

C. 172.5

D. 165.4

3886. The purpose of providing expansion bellows in the shell of tubular exchanger is to _____________________?
0

A. Account for the uneven expansion of shell and tube bundles

B. Increase the heating load

C. Facilitate increase of shell length, if needed

D. Impart structural strength

3887. A sphere of radius R1 is enclosed in a sphere of radius R2. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is ________________?
0

A. R2/(R1+R2)

B. (R1/R2)2

C. 0

D. 1

3888. Which has the lowest Prandtl number ?
0

A. Lube oil

B. Water

C. Aqueous solution

D. Liquid metal

3889. In a shell and tube heat exchanger, the shell side fluid velocity can?t be changed by changing the_________________?
0

A. Tube layout

B. Number of baffles

C. Tube diameter

D. Tube pitch

3890. In SI units, thermal conductivity is expressed in__________________?
0

A. Watt/m2. K

B. Watt/m2. K

C. Watt/m4. K

D. Watt/m.K

3891. Movement of pipeline caused by thermal expansion is taken care by providing ___________________?
0

A. Change in the shape of pipeline

B. Changes in its direction

C. Expansion joint

D. All A., B. and C.

3892. Rate of filtrate delivery is inversely proportional to the___________________?
0

A. Filtering area & the pressure difference driving force

B. Viscosity of filtrate

C. Cake & filter medium resistance

D. Both A. and B.

3893. The heat transfer co-efficient in film type condensation is _______________ that for dropwise condensation?
0

A. Lower than

B. Is same as

C. Half

D. Greater than

3894. In a forward feed multiple effect evaporator, the pressure is ____________________?
0

A. Lowest in last effect

B. Dependent on the number of effects

C. Highest in last effect

D. Same in all effects

3895. Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have ______________ roofs?
0

A. Flat

B. Floating

C. Fixed

D. Conical

3896. A perfect black body is a perfect _____________ of radiation?
0

A. Absorber

B. Emitter

C. Both A. & B.

D. Neither A. nor B.

3897. The equation, (NSt N2/3 Pr) = f/2, is the ____________ analogy ?
0

A. Reynolds

B. Prandtl

C. None of these

D. Colburn

3898. It is not preferable to use superheated steam in evaporators, because of its very_________________?
0

A. Low film co-efficient

B. High pressure

C. High temperature

D. None of these

3899. The force due to wind load acting on a tall vessel depends upon its___________________?
0

A. Height

B. Shape

C. Outside diameter

D. All A, B. & C.

3900. The Stefan-Boltzmann constant depends on the_________________?
0

A. Temperature

B. Surface

C. Medium

D. None of these

Previous Next

Showing 3881 to 3900 of 8709 mcqs