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

Introduction To Heat Transfer Level - 1 - GATE ME Free MCQ Test with solutions


MCQ Practice Test & Solutions: Test: Introduction To Heat Transfer Level - 1 (10 Questions)

You can prepare effectively for Mechanical Engineering Heat Transfer with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Introduction To Heat Transfer Level - 1". These 10 questions have been designed by the experts with the latest curriculum of Mechanical Engineering 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 25 minutes
  • - Number of Questions: 10

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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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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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About this Mechanical Engineering Practice Test

This test contains 10 MCQs on Introduction To Heat Transfer Level - 1 with detailed solutions for each question. It is part of the Heat Transfer course on EduRev, designed to align with the current Mechanical Engineering syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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