Transient Heat MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Transient Heat, a fundamental topic in the field of Heat Transfer. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Transient Heat MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Transient Heat mcq questions that explore various aspects of Transient Heat problems. Each MCQ is crafted to challenge your understanding of Transient Heat principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Heat Transfer tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Transient Heat MCQs are your pathway to success in mastering this essential Heat Transfer topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Transient Heat. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Transient Heat knowledge to the test? Let's get started with our carefully curated MCQs!

Transient Heat MCQs | Page 3 of 8

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Q21.
A thermocouple junction in the form of 4 mm radius sphere is to be used to measure the temperature of a gas stream. The junction is initially at 35 degree Celsius and is placed in a gas stream which is at 300 degree Celsius. The thermocouple is removed from the hot gas stream after 10 seconds and kept in still air at 25 degree Celsius with convective coefficient 10 W/m² K. Find out the time constant of the thermocouple. Assume the thermos-physical properties as given below:

h = 37.5 W/m² K

p = 7500 kg/m³

c = 400 J/kg K
Discuss
Answer: (b).106.67 seconds
Q22.
What percentage of water an average human body can have?
Discuss
Answer: (c).72%
Q23.
According to lumped system analysis, solid possesses thermal conductivity that is
Discuss
Answer: (a).Infinitely large
Q24.
The temperature and rate of heat conduction are undoubtedly dependent on
Discuss
Answer: (d).Both time and space coordinates
Q25.
Glass spheres of 2 mm radius and at 500 degree Celsius are to be cooled by exposing them to an air stream at 25 degree Celsius. Find the minimum time required for cooling to a temperature of 60 degree Celsius. Assume the following property values

Density = 2250 kg/m³

Specific heat = 850 J/kg K

Conductivity = 1.5 W/m K
Discuss
Answer: (b).14.78 seconds
Q26.
Which is true regarding lumped system analysis?
(i) Conductive resistance = 0

(ii) Convective resistance = 0

(iii) Thermal conductivity = 0

(iv) Thermal conductivity = infinity

Identify the correct statements
Discuss
Answer: (c).1 and 4
Discuss
Answer: (a).Heating or cooling of fine thermocouple wire due to change in ambient temperature
Q28.
What is the criterion for the applicability of lump system analysis?
Discuss
Answer: (c).Characteristics length
Q29.
What is the value of characteristics length for cylinder?
Discuss
Answer: (d).R/2
Q30.
During heat treatment, cylindrical pieces of 25 mm diameter, 30 mm height and at 30 degree Celsius are placed in a furnace at 750 degree Celsius with convective coefficient 80 W/m² degree. Find the value of biot number if thermal conductivity is 40 W/m degree
Discuss
Answer: (a).0.0082
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