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Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

Exercise : Heat Transfer, Refrigeration and Air Conditioning - Section 2
21.
Free convection flow depends on
density
coefficient of viscosity
gravitational force
all of these
Answer: Option
Explanation:
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22.
The critical pressure of a liquid is the pressure
above which a liquid will remain a liquid
above which a liquid will explode
above which a liquid will always convert into a vapour
below which a liquid will always be in vapour form
Answer: Option
Explanation:
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23.
Conduction is a process of heat transfer
from one particle of the body to another without the actual motion of the particles
from one particle of the body to another by the actual motion of the heated particles.
from a hot body to a cold body, in a straight line, without affecting the intervening medium
none of the above
Answer: Option
Explanation:
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24.
Thermal diffusivity of a substance is
directly proportional to the thermal conductivity
inversely proportional to density of substance
inversely proportional to specific heat
all of the above
Answer: Option
Explanation:
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25.
The sensible heat factor during the heating and humidification process is given by (where h1 = Enthalpy of air entering the heating coil, h2 = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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