Chemical Engineering Mcqs

In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is_________________?

• (A)  Linear
• (B)  Hyperbolic
• (C)  Parabolic
• (D)  None of these

Answer

Submitted By :Ali Uppal

Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because___________________?

• (A)  Convection becomes important
• (B)  Conduction becomes important
• (C)  Radiation becomes important
• (D)  Sub-cooled boiling occurs

Answer

Submitted By :Ali Uppal

The absorptivity of a grey body at a given temperature _____________ with increasing wavelength of radiation?

• (A)  Increases
• (B)  Decreases
• (C)  Remain constant
• (D)  May increase or decrease; depends on the material

Answer

Submitted By :Ali Uppal

In case of heat transfer by conduction in a hollow cylinder, ______________ mean area is used to calculate the heat transfer rate?

• (A)  Geometric
• (B)  Arithmetic
• (C)  Logarithmic
• (D)  Either

Answer

Submitted By :Ali Uppal

The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are_______________?

• (A)  Re.Gz
• (B)  Nu, Pr
• (C)  Nu, Pr, Re
• (D)  Nu, Gz

Answer

Submitted By :Ali Uppal

One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to________________?

• (A)  Heat the water from 0°C to 100°C
• (B)  Evaporate the water
• (C)  To superheat the steam
• (D)  Data insufficient, can’t be predicted

Answer

Submitted By :Ali Uppal

Solid angle subtended by the finite surface at the radiating element is_________________?

• (A)  Called the view factor
• (B)  Called the angle of vision
• (C)  Proportional to the square of the distance between surfaces
• (D)  Expressed in terms of radians

Answer

Submitted By :Ali Uppal

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?

• (A)  0.2 D
• (B)  0.5 D
• (C)  0.66 D
• (D)  0.80 D

Answer

Submitted By :Ali Uppal

Tube expansion allowances exist in _____________ heat exchanger?

• (A)  Multipass fixed tube sheet
• (B)  U-tube
• (C)  Single pass fixed tube sheet
• (D)  None of these

Answer

Submitted By :Ali Uppal

Multiple effect evaporation accounts for___________________?

• (A)  Steam economy
• (B)  Lower operating costs
• (C)  Investment economy
• (D)  None of these

Answer

Submitted By :Ali Uppal