HEAAT

 Condensation refers to a change from the

• Solid to liquid phase

• Vapor to liquid phase

• Liquid to solid phase

• Liquid to vapor phase

A body is called a gray body if the monochromatic emissivity of the body is

• Zero

• One

• Same for all wavelengths

• Different for all wavelengths

In double pipe heat exchangers, for chilling oil to be dewaxed, there are scrapers inside the pipe to keep the walls of pipe clean and to increase the mixing of the warmer oil with the cooler oil thus increasing the rate of heat transfer by

• Conduction

• Convection

• Radiation

• By all means

Baffles used on the shell side of a heat exchanger will

• Decrease heat transfer rate

• Increase heat transfer rate

• Not affect heat transfer rate

• Decrease pressure drop on shell side

The absorption coefficient is the maximum for 

• white lead paint

• light cream paint

• grey paint

• black matte paint

Forced convection in a liquid bath is caused by

• Intense stirring by an external agency

• Density difference brought about by temperature gradients

• Molecular energy interactions

• Flow of electrons in a random fashion

Steam condensate is highly corrosive mainly due to

• Presence of CO₂

• Presence of dissolved O₂

• Presence of both dissolved CO₂ and O₂

• Other reason than the presence of either dissolved CO₂ or O₂

When heat is transferred by a chain of molecules from the hot area of an object to a colder area, the process of heat transfer is called

• Natural Convection

• Radiation

• Conduction

• Forced Convection

Depending upon the behavior of condensate up on the cooled surface, the condensation process are classified into how many distinct modes?

• 1

• 2

• 3

• 4

The resistance offered by the film to the heat flow will be …..

• Low

• Very low

• Large

• Very large