1
1.25
2.15
5.12
✅ The correct answer is option B.
Heat Transfer
A composite slab has two layers of different materials with thermal conductivities k1 and k2. If each layer has the same thickness, then the equivalent thermal conductivity of the slab will be
k1 k2
k1 + k2
✅ The correct answer is option D.
In a black body, all radiations are rejected.
TRUE
FALSE
✅ The correct answer is option B.
The transfer of heat by molecular collision is known as
conduction
convection
radiation
none of these
✅ The correct answer is option A.
The humidification process, on the psychrometric chart is shown by
horizontal line
vertical line
inclined line
curved line
✅ The correct answer is option B.
The emissive power of a body depends upon its
temperature
physical nature
wave length
all of these
✅ The correct answer is option D.
The refrigerant supplied to a compressor must be
superheated vapour refrigerant
dry saturated liquid refrigerant
a mixture of liquid and vapour refrigerant
none of these
✅ The correct answer is option A.
The process of removing moisture from the air, without change in its dry bulb temperature, is called dehumidification.
Correct
Incorrect
✅ The correct answer is option A.
Dry bulb temperature is the temperature of air recorded by a thermometer, when
it is not affected 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 A.
Most thermostatic expansion valves are set for a superheat of
5°C
10°C
15°C
20°C
✅ The correct answer is option A.