When α is absorptivity, ρ is reflectivity and τ is transmittivity, then for a diathermanous body,

A)
α = 0, ρ = 1 and τ = 0
B)
α = 1, ρ = 0 and τ = 0
C)
α + ρ = 1 and τ = 0
D)
α = 0, ρ = 0 and τ = 1

Correct Answer : Option (C) :   α + ρ = 1 and τ = 0

Recently Updated in Heat Transfer, Refrigeration and Air Conditioning Questions
The value of the wave length for maximum emissive power is given by
A)
Wein's law
B)
Stefan's law
C)
Planck's law
D)
Kirchhoff's law

Correct Answer :   Wein's law

Emissivity of a body will be equal to its absorptivity at all temperatures.
A)
Yes
B)
No
C)
Can Not Say
D)
None of the above

Correct Answer :   Yes

During dehumidification process, __________ remains constant.
A)
specific humidity
B)
dry bulb temperature
C)
relative humidity
D)
wet bulb temperature

Correct Answer :   dry bulb temperature

Mechanical Engineering MCQ's

Theory of Machines
Engineering Mechanics
Machine Design
Strength of Materials
Engineering Materials
Hydraulic Machines
Thermodynamics
Engineering Drawing
Workshop Technology
Automobile Engineering
Steam Boilers and Engines
More