Mechanical Engineering · all questions

Heat And Mass Transfer
practice.

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

163

Questions

6/9

Page

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

Q101

Open question

In heat exchangers, degree of approach is defined as the difference between temperatures of

Select an option to see the answer and solution.

Q102

Open question

Fouling factor is used

Select an option to see the answer and solution.

Q103

Open question

The natural convection air cooled condensers are used in

Select an option to see the answer and solution.

Q104

Open question

The concept of overall coefficient of heat transfer is used in heat transfer problems of

Select an option to see the answer and solution.

Q105

Open question

An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

Select an option to see the answer and solution.

Q106

Open question

The logarithmic mean temperature difference (

t_{m}

) is given by (where

Δ t_{1}

and

Δ t_{2}

are temperature differences between the hot and cold fluids at entrance and exit)

Select an option to see the answer and solution.

Q107

Open question

Emissivity of a white polished body in comparison to a black body is

Select an option to see the answer and solution.

Q108

Open question

The heat of sun reaches to us according to

Select an option to see the answer and solution.

Q109

Open question

Thermal diffusivity of a substance is

Select an option to see the answer and solution.

Q110

Open question

The insulation ability of an insulator with the presence of moisture would

Select an option to see the answer and solution.

Q111

Open question

The transfer of heat by molecular collision is smallest in

Select an option to see the answer and solution.

Q112

Open question

According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Select an option to see the answer and solution.

Q113

Open question

Cork is a good insulator because it has

Select an option to see the answer and solution.

Q114

Open question

Pick up the wrong case. Heat flowing from one side to other depends directly on

Select an option to see the answer and solution.

Q115

Open question

Thermal conductivity of solid metals with rise in temperature normally

Select an option to see the answer and solution.

Q116

Open question

The heat transfer by conduction through a thick sphere is given by

Select an option to see the answer and solution.

Q117

Open question

The value of the wave length for maximum emissive power is given by

Select an option to see the answer and solution.

Q118

Open question

The value of the wavelength for maximum emissive power is given by

Select an option to see the answer and solution.

Q119

Open question

The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Select an option to see the answer and solution.

Q120

Open question

The emissivity for a black body is

Select an option to see the answer and solution.

Prev 4 5 6 7 8 Next

Heat And Mass Transferpractice.

Heat And Mass Transfer
practice.