HEAT TRANSFER QUIZ

In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.

Pool

None of these

Nucleate

Low pressure

TRUE ANSWER : ?
YOUR ANSWER : ?

Steady state one dimensional heat flow by conduction as given by Fourier's low does not assume that

Boundary surfaces are isothermal

Material is anisotropic

Constant temperature gradient exists

There is no internal heat generation

TRUE ANSWER : ?
YOUR ANSWER : ?

As per Kirchoffs law, the ratio of the total radiating power to the absorptivity of a body depends on the

nature of material of body

wavelength of monochromatic radiation

temperature of the body only

none of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

Choose the correct equation.

Nu = (Re) (Pr) (St)

Nu = (Pr)(St)

Nu = (Re) (Pr) (Gz)

Nu = (Re)(Pr)

TRUE ANSWER : ?
YOUR ANSWER : ?

Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is

4.364

0.72

83

18

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is the most suitable for cold viscous feed?

Mixed feed

Forward feed

Parallel feed

Backward feed

TRUE ANSWER : ?
YOUR ANSWER : ?

In the equation Q = UAΔt; Δt is

The difference of average bulk temperatures of hot and cold fluids

Geometric mean temperature difference

Arithmetic mean temperature difference

Logarithmic mean temperature difference

TRUE ANSWER : ?
YOUR ANSWER : ?

The units of resistance to heat transfer is

J.m⁻¹.K⁻¹

W⁻¹m²K

J.m⁻².K⁻¹

W.m⁻².K⁻¹

TRUE ANSWER : ?
YOUR ANSWER : ?

Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats

R and S

P and Q

P and S

P and R

TRUE ANSWER : ?
YOUR ANSWER : ?

Forced circulation evaporators are normally used for concentrating liquids having

Scaling characteristics

Both A & B

Neither A nor B

High viscosity

TRUE ANSWER : ?
YOUR ANSWER : ?

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