Heat Transfer QUESTIONS AND ANSWERS

Mechanical Engineering : Heat Transfer QUESTIONS AND ANSWERS :: part3 : 16 to 20

Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

16.The value of Portland number for air is about

0.1

0.3

0.7

1.7

10.5.

17.The value of the wavelength for maximum emissive power is given by

Wien's law

Planck's law

Stefan's law

Fourier's law

Kirchhoff's law.

18.All radiations in a black body are

reflected

refracted

transmitted

absorbed

partly reflected and partly absorbed.

19.The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Krichoff's law

Stefan's law

Wien' law

Planck's law

Black body law.

20.According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

absolute temperature

square of temperature

fourth power of absolute temperature

fourth power of temperature

cube of absolute temperature.

More Heat Transfer QUESTIONS AND ANSWERS available in next pages