Q. A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because

View solution

Q. Pick out the wrong statement.

View solution

Q. When warm and cold liquids are mixed, the heat transfer is mainly by

View solution

Q. A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?

View solution

Q. Vent pipes are provided in a condenser to

View solution

Q. Heat transfer by natural convection is enhanced in system with

View solution

Q. Grashoff number, which is defined as g . β(Ts - T∞) ρ². L³/μ², is proportional to the ratio of buoyancy force to __________ force.

View solution

Q. Pick out the wrong statement.

View solution

Q. For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in

View solution

Q. Economy of an evaporator is influenced by the

View solution

Q. For a fluid flowing in an annulus space, the wetted perimeter for heat transfer and pressure drop are

View solution

Q. During crystallisation, formation of crystal can occur in __________ solution only.

View solution

Q. An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

View solution

Q. An insulator should have

View solution

Q. In a backward feed multiple effect evaporator

View solution

Q. The Grashoff number is defined as the ratio of the

View solution

Q. According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)

View solution

Q. The absorptivity of a body is equal to its emissivity

View solution

Q. Absorptivity and refletivity of a perfect black body are respectively

View solution

Q. In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)

View solution