HEAT AND MASS TRANSFER QUIZ

Heat is closely related with

Temperature

Entropy

Liquids

Energy

TRUE ANSWER : ?
YOUR ANSWER : ?

The most commonly used method for the design of duct size is the

Static regains method

Dual or double method

Velocity reduction method

Equal friction method

TRUE ANSWER : ?
YOUR ANSWER : ?

Temperature of steam at around 540°C can be measured by

Thermometer

Thermocouple

None of these

Thermistor

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal conductivity of water in general with rise in temperature

May increase or decrease depending on temperature

Remain constant

Decreases

Increases

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Time

Temperature difference

Face area

Thickness

TRUE ANSWER : ?
YOUR ANSWER : ?

In a shell and tube heat exchanger, baffles are provided on the shell side to

Provide support for tubes

Improve heat transfer

All of these

Prevent stagnation of shell side fluid

TRUE ANSWER : ?
YOUR ANSWER : ?

The transfer of heat by molecular collision is smallest in

None of these

Solids

Gases

Liquids

TRUE ANSWER : ?
YOUR ANSWER : ?

Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

Maximum energy

Minimum energy

None of these

Both (A) and (B)

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal conductivity of a material may be defined as the

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

All of these

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

TRUE ANSWER : ?
YOUR ANSWER : ?

A perfect black body is one which

Transmits all heat radiations

Absorbs heat radiations of all wave lengths falling on it

Is black in colour

Reflects all heat

TRUE ANSWER : ?
YOUR ANSWER : ?