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 6 of 8

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Q51.
Which of the following is not correct in a transient flow process?

a.

The state of matter inside the control volume varies with time

b.

There can be work and heat interactions across the control volume

c.

There is no accumulation of energy inside the control volume

d.

The rate of inflow and outflow of mass are different

Discuss
Answer: (c).There is no accumulation of energy inside the control volume
Q52.
A cylindrical stainless steel (k = 25 W/m K) ingot, 10 cm in diameter and 25 cm long, passes through a heat treatment furnace which is 5 meter in length. The initial ingot temperature is 90 degree Celsius, the furnace gas is at 1260 degree Celsius and the combined radiant and convective surface coefficient is 100 W/m² K. Determine the maximum speed with which the ingot moves through the furnace if it must attain 830 degree Celsius temperature. Take thermal diffusivity as 0.45 * 10¯⁵ m²/s

a.

. 000116 m/s

b.

.000216 m/s

c.

. 000316 m/s

d.

. 000416 m/s

Discuss
Answer: (b)..000216 m/s
Q53.
The curve for unsteady state cooling or heating of bodies is

a.

Hyperbolic curve asymptotic both to time and temperature axis

b.

Exponential curve asymptotic both to time and temperature axis

c.

Parabolic curve asymptotic to time axis

d.

Exponential curve asymptotic to time axis

Discuss
Answer: (d).Exponential curve asymptotic to time axis
Q54.
What is the wavelength band for TV rays?

a.

1 * 10³ to 34 * 10¹⁰ micron meter

b.

1 * 10³ to 2 * 10 ¹⁰ micron meter

c.

1 * 10³ to 3 * 10¹⁰ micron meter

d.

1 * 10³ to 56 * 10¹⁰ micron meter

Discuss
Answer: (b).1 * 10³ to 2 * 10 ¹⁰ micron meter
Q55.
Diagram shows transient heat conduction in an infinite plane wall. Identify the correct boundary condition in transient heat conduction in solids with finite conduction.

a.

t = t i at T = 0

b.

d t /d x = 1 at x = 0

c.

d t /d x = infinity at x = 1

d.

d t / d x = infinity at x = 0

Discuss
Answer: (a).t = t i at T = 0
Q56.
Let there is some conduction resistance, then temperature becomes a function of
(i) Biot number
(ii)Fourier number
(iii) Dimensionless parameter
Identify the correct statement

a.

1 and 2

b.

2 and 3

c.

1 and 3

d.

1, 2 and 3

Discuss
Answer: (d).1, 2 and 3
Q57.
A large steel plate 50 mm thick is initially at a uniform temperature of 425 degree Celsius. It is suddenly exposed on both sides to an environment with convective coefficient 285 W/m² K and temperature 65 degree Celsius. Determine the center line temperature.
For steel, thermal conductivity = 42.5 W/m K and thermal diffusivity = 0.043 m²/hr

a.

261 degree Celsius

b.

271 degree Celsius

c.

281 degree Celsius

d.

291 degree Celsius

Discuss
Answer: (c).281 degree Celsius
Q58.
“When Biot number exceeds 0.1 but is less than 100, use is made of Heislers charts for the solution of transient heat conduction”. Choose the correct answer

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (a).True
Q59.
A 12 cm diameter cylindrical bar, initially at a uniform temperature of 40 degree Celsius, is placed in a medium at 650 degree Celsius with convective coefficient of 22 W/m² K. Determine the time required for the center to reach 255 degree Celsius. For the material of the bar:
Thermal conductivity = 20 W/m K
Density = 580 kg/m³
Specific heat = 1050 J/kg K

a.

1234.5 seconds

b.

1973.16 seconds

c.

3487.3 seconds

d.

2896.4 seconds

Discuss
Answer: (b).1973.16 seconds
Q60.
“A solid which extend itself infinitely in all directions of space is termed as finite solid”. Choose the correct answer

a.

True

b.

False

c.

May be

d.

Can't say

Discuss
Answer: (b).False
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