Explore topic-wise MCQs in Heat Transfer.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.

1.

A body through which all the incident radiations passes, is called

A. Opaque body
B. Black body
C. Transparent body
D. White body
Answer» D. White body
Discussion
2.

With respect to incident radiation, transmissivity varies with

A. Time
B. Temperature
C. Surface area
D. Wavelength
Answer» E.
Discussion
3.

Radiant energy with an intensity of 800 W/m2 strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of transmission

A. 155.47 W/m2
B. 145.47 W/m2
C. 135.47 W/m2
D. 125.47 W/m2
Answer» C. 135.47 W/m2
Discussion
4.

A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation

A. 11.04 W/m2 degree
B. 12.04 W/m2 degree
C. 13.04 W/m2 degree
D. 14.04 W/m2 degree
Answer» D. 14.04 W/m2 degree
Discussion
5.

Of the radiant energy 350W/m2 incident upon a surface 250W/m2 is absorbed, 60W/m2 is reflected and the remainder is transmitted through the surface. Workout the value for absorptivity for the surface material

A. 0.113
B. 0.114
C. 0.115
D. 0.116
Answer» D. 0.116
Discussion
6.

WITH_RESPECT_TO_INCIDENT_RADIATION,_TRANSMISSIVITY_VARIES_WITH?$

A. Time
B. Temperature
C. Surface area
D. Wavelength
Answer» E.
Discussion
7.

A body through which all the incident radiations passes, is called$

A. Opaque body
B. Black body
C. Transparent body
D. White body
Answer» D. White body
Discussion
8.

Radiant energy with an intensity of 800 W/m2 strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of transmissio?

A. 155.47 W/m<sup>2</sup>
B. 145.47 W/m<sup>2</sup>
C. 135.47 W/m<sup>2</sup>
D. 125.47 W/m<sup>2</sup>
Answer» C. 135.47 W/m<sup>2</sup>
Discussion
9.

A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions at 295 K temperature. The emissivity of the surface is 0.2 and the convection coefficient of heat transfer is 11.35 W/m2 degree. Calculate the overall coefficient of heat transfer by the combined mode of convection and radiation

A. 11.04 W/m<sup>2</sup> degree
B. 12.04 W/m<sup>2</sup> degree
C. 13.04 W/m<sup>2</sup> degree
D. 14.04 W/m<sup>2</sup> degree
Answer» D. 14.04 W/m<sup>2</sup> degree
Discussion
10.

Transmissivity is defined as

A. Fraction of total energy transmitted by the body
B. Fraction of total energy reflected by the body
C. Fraction of total energy absorbed by the body
D. Fraction of total energy absorbed and radiated by the body
Answer» B. Fraction of total energy reflected by the body
Discussion
11.

What is the wavelength band of gamma rays?

A. 1 * 10<sup> -7</sup> to 4 * 10<sup> -4</sup> micron meter
B. 2 * 10<sup> -7</sup> to 2.4 * 10<sup> -4</sup> micron meter
C. 3 * 10<sup> -7</sup> to 3.4 * 10<sup> -4</sup> micron meter
D. 4 * 10<sup> -7</sup> to 1.4 * 10<sup> -4</sup> micron meter
Answer» E.
Discussion
12.

A cavity with a small hole will always behave as a

A. White body
B. Transparent body
C. Black body
D. Opaque body
Answer» D. Opaque body
Discussion
13.

Transmissivity can also be defined as a ratio of transmitted radiation to that of incident energy flow.

A. True
B. False
Answer» C.
Discussion
14.

Of the radiant energy 350W/m2 incident upon a surface 250W/m2 is absorbed, 60W/m2 is reflected and the remainder is transmitted through the surface. Workout the value for absorptivity for the surface material

A. 0.113
B. 0.114
C. 0.115
D. 0.116
Answer» D. 0.116
Discussion
15.

The value of transmissivity may vary from

A. 0-1
B. 1-2
C. 3-4
D. 4-5
Answer» B. 1-2
Discussion