Chemical Engineering Mcqs

Nusselt number is a function of Prandtl number and ______________ number of fluid in natural convection heat transfer?

• (A)  Grashoff
• (B)  Biot
• (C)  Stanton
• (D)  Reynolds

Answer

Submitted By :Ali Uppal

Radiation energy is emitted by all the substances, which are above____________________?

• (A)  0°K
• (B)  0°C
• (C)  100°C
• (D)  Room temperature

Answer

Submitted By :Ali Uppal

The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is_________________?

• (A)  Nusselt number
• (B)  Sherwood number
• (C)  Schmidt number
• (D)  Stanton number

Answer

Submitted By :Ali Uppal

Loss of heat from untagged steam pipe to the ambient air is by __________________?

• (A)  Conduction
• (B)  Convection
• (C)  Radiation
• (D)  All

Answer

Submitted By :Ali Uppal

In Biot number, the characteristic length used is the ratio of the _______________ of the solid?

• (A)  Volume to surface area
• (B)  Perimeter to surface area
• (C)  Surface area to volume
• (D)  Surface area to perimeter

Answer

Submitted By :Ali Uppal

Boiling point elevation for a strong and concentrated solution is found by Duhring’s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the _______________ of pure water?

• (A)  Boiling point
• (B)  Dynamic viscosity
• (C)  Kinematic viscosity
• (D)  Density

Answer

Submitted By :Ali Uppal

Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K) ?

• (A)  t4
• (B)  T4
• (C)  1/t4
• (D)  1/T4

Answer

Submitted By :Ali Uppal

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

• (A)  Colburn
• (B)  Reynolds
• (C)  Prandtl
• (D)  None of these

Answer

Submitted By :Ali Uppal

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

• (A)  Greater than
• (B)  Lower than
• (C)  Is same as
• (D)  Half

Answer

Submitted By :Ali Uppal

Steam economy in case of a triple effect evaporator will be _________________?

• (A)  1
• (B)  < 1
• (C)  > 1
• (D)  Between 0 and 1

Answer

Submitted By :Ali Uppal