Category: Chemical Heat Transfer

A. Has the unit m2 /sec
B. Is defined as K/ρ . Cp
C. Is the ratio of thermal conductivity to thermal capacity
D. All A., B. and C.

A. Yellow paint
B. White paint
C. Black paint
D. Grey paint

A. In process heat exchangers, saturated steam is preferred over the superheated steam
B. The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength
of λ1. If the surface temperature is halved, the maximum in the emissive power would occur at
a wavelength of 0.5 λ1
C. When a vertical plate is heated in infinite air environmental under natural convection
conditions, the velocity profile in air, normal to the plate, exhibits a maximum
D. A body at 925 K emits an energy of 1.42 x 1011ζW/m2 (ζ is the Stefan-Boltzmann constant) in
the wavelength band between 3 μm to 4 μm. The fraction of this energy in the total energy
emitted over the entire wavelength range is equal to emissivity

A. Rate of heat transfer
B. Flow velocity
C. Turbulence of shell side fluid
D. All A., B. and C.

A. Small
B. Large
C. All
D. One fixed

A. t
B. 1/ρ
C. 1/A
D. All A., B. & C.

A. Increase the heating load
B. Impart structural strength
C. Account for the uneven expansion of shell and tube bundles
D. Facilitate increase of shell length, if needed

A. Increases
B. Decreases
C. Is not affected
D. May increase or decrease; depends on the feed

A. Film
B. Sub-cooled
C. Saturated nucleate
D. None of these

A. Cube
B. Plate
C. Sphere
D. All will cool at the same rate