Chemical Engineering · all questions

Heat Transfer
practice.

Practice every MCQ with options. Use Show answers when you want the correct option and solution.

517

Questions

11/26

Page

Pick an option on a question to see the right answer and solution.

Q201

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.

Select an option to see the answer and solution.

Q202

In a single effect evaporator, the economy is

Select an option to see the answer and solution.

Q203

Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.

Select an option to see the answer and solution.

Q204

Film condensation is promoted on a/an __________ surface.

Select an option to see the answer and solution.

Q205

Dropwise condensation is promoted on a/an __________ surface.

Select an option to see the answer and solution.

Q206

In a backward feed multiple effect evaporator

Select an option to see the answer and solution.

Q207

Which type of heat exchanger is preferred for heavy heat loads?

Select an option to see the answer and solution.

Q208

A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions ? Assume that the conductive heat transfer co-efficient is infinitely large.

Select an option to see the answer and solution.

Q209

Boiling point elevation of an ideal solution

Select an option to see the answer and solution.

Q210

The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is

Select an option to see the answer and solution.

Q211

The advantage of using a 1 - 2 shell and tube heat exchanger over a 1 - 1 shell and tube heat exchanger is

Select an option to see the answer and solution.

Q212

The purpose of providing expansion bellows in the shell of tubular exchanger is to

Select an option to see the answer and solution.

Q213

Nusselt number is the ratio of the

Select an option to see the answer and solution.

Q214

Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?

Select an option to see the answer and solution.

Q215

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

Select an option to see the answer and solution.

Q216

In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms^-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is

Select an option to see the answer and solution.

Q217

The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is

Select an option to see the answer and solution.

Q218

The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law.

Select an option to see the answer and solution.

Q219

Log mean temperature difference (LMTD) cannot be used, if

Select an option to see the answer and solution.

Q220

Multiple effect evaporation is generally recommended, when the

Select an option to see the answer and solution.

Prev 9 10 11 12 13 Next