Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

36.
Thermal conductivity of a material may be defined as the
quantity of heat flowing in one second through a slab of the material of area 1 cm2 and thickness 1 cm when its faces differ in temperature by 1° C
quantity of heat flowing in one second through one cm of material when opposite faces are maintained at a temperature difference of 1° C
heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
all of the above
Answer: Option
Explanation:
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37.
During sensible heating of air, specific humidity remains constant.
Agree
Disagree
Answer: Option
Explanation:
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38.
Air refrigeration cycle is used in
commercial refrigerators
domestic refrigerators
air-conditioning
gas liquefaction
Answer: Option
Explanation:
No answer description is available. Let's discuss.

39.
Reynolds number is the ratio of
energy transferred by convection to that by conduction
kinematic viscosity to thermal diffusivity
inertia force to viscous force
none of the above
Answer: Option
Explanation:
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40.
The wet bulb depression is zero when relative humidity is
zero
0.5
0.75
1.0
Answer: Option
Explanation:
No answer description is available. Let's discuss.