A black body does not ____________ radiation?
A black body does not ____________ radiation?
A. Absorb or emit
B. Refract
C. Reflect
D. Both B. & C.
Similar Posts
Reynold’s analogy states that_________________?
Reynold’s analogy states that_________________?A. Nst α f
B. Nst α NRe
C. NNu α f
D. NRe α fAbsorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?
Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?A. Aluminium foil
B. Refractory bricks
C. Iron plate
D. Coke breezeWhich of the following has the minimum thermal conductivity ?
Which of the following has the minimum thermal conductivity ?A. Nitrogen
B. Steel
C. Carbon black
D. TarSteam economy in case of a triple effect evaporator will be _________________?
Steam economy in case of a triple effect evaporator will be _________________?A. 1
B. < 1
C. > 1
D. Between 0 and 1Thermal conductivity of a gas at low density, ___________ with increase in temperature ?
Thermal conductivity of a gas at low density, ___________ with increase in temperature ?A. Decreases
B. Increases
C. Remains unchanged
D. May increase or decrease; depends on the gasIn case of a multipass shell and tube heat exchanger, the temperature drop in the fluid _______________?
In case of a multipass shell and tube heat exchanger, the temperature drop in the fluid _______________?A. Is inversely proportional to the resistance across which the drop occurs
B. And the wall are proportional to individual resistances
C. And the wall is not related
D. None of these