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Test: Basic Concepts of Heat Transfer - 2


10 Questions MCQ Test Heat Transfer | Test: Basic Concepts of Heat Transfer - 2


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Attempt Test: Basic Concepts of Heat Transfer - 2 | 10 questions in 30 minutes | Mock test for Chemical Engineering preparation | Free important questions MCQ to study Heat Transfer for Chemical Engineering Exam | Download free PDF with solutions
QUESTION: 1

Thermal conductivity of water in general with rise in temperature

Solution:

QUESTION: 2

Thermal conductivity of air with rise in temperature

Solution:

QUESTION: 3

Heat is mainly transferred by conduction, convection and radiation in

Solution:

Because for radiation to be comparable the magnitude of temperature difference should be large enough, Convection & conduction is also predominant in boiler furnace.

QUESTION: 4

Heat conduction in gases is due to
Solution:
QUESTION: 5

Heat transfer by molecular collision in
Solution:
QUESTION: 6

Arrangement of silver, air, aluminium and lead in order of increasing thermal conductivity at room temperature yields
Solution:

According to their thermal conductivity for Air, k = 0.022 W/mK
for Aluminium, k = 205 W/mK
for Silver, k = 407 W/mK
Hence correct sequence is
Air, Lead, Aluminium, Silve

QUESTION: 7

Metals are good conductors of heat because of
Solution:
  • The thermal conductivity of the liquids is more than the gasses and the metals have the highest.
  • Metals have valence electrons that are free to move around the surface. When heated, these free electrons collide with each other and the majority of the Kinetic energy is transformed into heat energy, making metals a good conductor of heat.
  • In the gaseous state, the molecules of a substance are spaced relatively far away, and their motion is random. This means that energy transfer by the molecular impact is much slower than in the case of a liquid, in which the motion is still random but in liquids, the molecules are more closely packed. The same is true concerning the difference between the thermal conductivity of the liquid and solid phases.
QUESTION: 8

Choose the correct statement about thermaf conductivity
Solution:

Due to increase in lattice vibratioh the thermal conductivity of metals decreases with increase in temperature.

QUESTION: 9

Cork is used as a good insulator
Solution:
QUESTION: 10

In which one of the following materials, is the heat energy propagation minimum due to conduction heat transfer
Solution:

Since thermal conductivity of air is minimum among the given material hence heat transfer will be minimum in air.

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