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Heat And Mass Transfer MCQ Questions & Answers | Mechanical Engineering

Learn Heat And Mass Transfer MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Heat And Mass Transfer MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-7 section-2

Each section contains 100 MCQs on Heat and Mass Transfer .
61
When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a
Discuss
Answer & Solution
Answer: Option A
Solution:
A blackbody surface completely absorbs external irradiation, regardless of direction and wavelength distribution. Its surface absorptivity is always 1, so αλ = α = 1. The reflectivity of a blackbody is always zero.
62
The unit of Stefan Boltzmann constant is
Discuss
Answer & Solution
Answer: Option D
Solution:
The value of the Stefan-Boltzmann constant is approximately 5.67 x 10-8 watt per metre squared per kelvin to the fourth.
Its unit is W/m2K4 or W/cm2K4.
63
The unit of Stefan-Boltzmann constant is
Discuss
Answer & Solution
Answer: Option C
Solution:
The value of the Stefan-Boltzmann constant is approximately 5.67 x 10-8 watt per metre squared per kelvin to the fourth.