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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Heat Transfer  >  Test: Introduction To Heat Transfer Level - 1 - Mechanical Engineering MCQ

Test: Introduction To Heat Transfer Level - 1 - Mechanical Engineering MCQ


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10 Questions MCQ Test Heat Transfer - Test: Introduction To Heat Transfer Level - 1

Test: Introduction To Heat Transfer Level - 1 for Mechanical Engineering 2024 is part of Heat Transfer preparation. The Test: Introduction To Heat Transfer Level - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Introduction To Heat Transfer Level - 1 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Introduction To Heat Transfer Level - 1 below.
Solutions of Test: Introduction To Heat Transfer Level - 1 questions in English are available as part of our Heat Transfer for Mechanical Engineering & Test: Introduction To Heat Transfer Level - 1 solutions in Hindi for Heat Transfer course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Test: Introduction To Heat Transfer Level - 1 | 10 questions in 25 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study Heat Transfer for Mechanical Engineering Exam | Download free PDF with solutions
Test: Introduction To Heat Transfer Level - 1 - Question 1
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The propagation of heat by molecular level activity is called

Detailed Solution for Test: Introduction To Heat Transfer Level - 1 - Question 1
Heat conduction through a medium is a result of molecular level activities in the medium which are 1. Lattice vibration 2. Free transfer 3. Diffusion and 4. Intermolecular collision when accompanied by a temperature gradient.

Test: Introduction To Heat Transfer Level - 1 - Question 2
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Cork is a good insulator because

Detailed Solution for Test: Introduction To Heat Transfer Level - 1 - Question 2
Even though cork is a solid material, but it’s thermal conductivity is extremely low because of air filled in it’s pores. Typical value of thermal conductivity is in the range of 0.035 to 0.043 W/m-k

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Test: Introduction To Heat Transfer Level - 1 - Question 3
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Heat transfer in a long, hollow cylinder which is maintained at uniform but different temperatures on its inner and outer surfaces may be assumed to be taking place in which direction?

Detailed Solution for Test: Introduction To Heat Transfer Level - 1 - Question 3

Ambient temperature is uniform on the periphery of cylinder and temperature is uniform. So it takes place in the radial direction only.

Test: Introduction To Heat Transfer Level - 1 - Question 4
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Consider H and O₂ gas, both at temperature of 30°C. The thermal conductivity of H is ________ than that of O₂.
Detailed Solution for Test: Introduction To Heat Transfer Level - 1 - Question 4

The thermal conductivity of a gaseous medium is dominantly based on diffusion rate, which depends on root mean square velocity.The root mean square velocity for molecules is given by

where M is the molecular mass of the gas & T is the temperature of the gas and ̅ is universal gas constant. Thus diffusion rate and therefore thermal conductivity is lower for gases with higher molecular masses because

Therefore H₂ gas has more thermal conductivity than O₂.

Test: Introduction To Heat Transfer Level - 1 - Question 5
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If temperature of water increases then thermal conductivity of water
Detailed Solution for Test: Introduction To Heat Transfer Level - 1 - Question 5

Though for liquids, thermal conductivity decreases with rise in temperature but water is an exceptional case due to bonding between oxygen atom of one molecule and hydrogen atom of other. As a result with rise in temperature, thermal conductivity of water increases from 0°C TO 4,4°C achieves a maxima and then decreases.

Test: Introduction To Heat Transfer Level - 1 - Question 6
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A sphere, a cube and a disc all are of the same material, quality and volume, are heated to 900 K and left in air. Which of these will have the lowest rate of cooling
Detailed Solution for Test: Introduction To Heat Transfer Level - 1 - Question 6
For a given volume, the sphere has a minimum surface area hence rate of heat transfer to air by convection or radiation is minimum.

Test: Introduction To Heat Transfer Level - 1 - Question 7
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Consider the astronaut compartments inside a space shuttle orbiting the moon. Inside these compartments air is maintained at STP conditions for comfortable breathing of astronauts. The cooling system of electronic equipment inside these compartments is based on
Detailed Solution for Test: Introduction To Heat Transfer Level - 1 - Question 7
Since the equipment is in air and surface temperature is generally not high, conduction and radiation heat loss is insignificant. Also in space there is no gravity. Thus buoyancy and therefore free convection is not at all possible in the compartment air. Hence the only suitable mode for cooling is forced convection.

Test: Introduction To Heat Transfer Level - 1 - Question 8
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Heat conduction in gases is due to
Detailed Solution for Test: Introduction To Heat Transfer Level - 1 - Question 8
In fluids (liquids and gases), the heat conduction is a result of diffusion and intermolecular collision. But in case of gases, due to low density and high root mean square velocity of molecules the rate of diffusion is much more dominant then intermolecular collision. But in the options diffusion is not mentioned thus elastic impact of molecules due to inter molecular collision is the correct answer.

Test: Introduction To Heat Transfer Level - 1 - Question 9
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Which of the following events represents thermal radiation?
Detailed Solution for Test: Introduction To Heat Transfer Level - 1 - Question 9
In microwave ovens, the radiation emitted is a result of excitation of crystals like magnetrons and klystrons and in microwave wavelength band which is not in the range of thermal radiation. Also during nuclear reactions like those inside sun, -rays are produced which is actually not considered as thermal radiation. Once these -rays get absorbed by the matter in the sun then temperature rises and thermal radiation is emitted. Thus nuclear reaction does not directly emit thermal radiation.

But during lighting of bulb energy is emitted mainly in form of light and IR due to temperature of tungsten filament. Thus this event is termed as thermal radiation.

Test: Introduction To Heat Transfer Level - 1 - Question 10
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Which of the following is used to measure the temperature inside a furnace?
Detailed Solution for Test: Introduction To Heat Transfer Level - 1 - Question 10
In a furnace heat transfer is a result of thermal radiation due to high temperature values and contribution of conduction and convection to the phenomenon is insignificant. Hence optical pyrometers are best suited devices to measure temperature inside the furnace. These devices detect wavelength corresponding to maximum monochromatic emissive power in the infrared radiation and using Wien’s law, it predicts the temperature.
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