it is not effected by the moisture present in the air
its bulb is surrounded by a wet cloth exposed to the air
the moisture present in it begins to condense
none of the above
✅ The correct answer is option B.
Heat Transfer
The curved lines on a psychrometric chart indicates
dry bulb temperature
wet bulb temperature
dew point temperature
relative humidity
✅ The correct answer is option D.
Wein’s law states that the wave length corresponding to __________ is proportional to the absolute temperature.
minimum energy
maximum energy
✅ The correct answer is option B.
Thermal conductivity of solid metals __________ with rise in temperature.
remains same
decreases
increases
✅ The correct answer is option B.
A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
lack of cooling water
water temperature being high
dirty condenser surface
all of these
✅ The correct answer is option D.
In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line, represents sub-cooled liquid region.
TRUE
FALSE
✅ The correct answer is option B.
The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is
high pressure saturated liquid
wet vapour
very wet vapour
dry vapour
✅ The correct answer is option C.
The transfer of heat by molecular collision is smallest in
solids
liquids
gases
none of these
✅ The correct answer is option C.
The rate of heat flow through a body is . The term is known as temperature gradient.
Yes
No
✅ The correct answer is option A.
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m2). The critical thickness of insulation will be
25 mm
40 mm
160 mm
800 mm
✅ The correct answer is option A.