constant pressure valve
constant temperature valve
constant superheat valve
none of these
✅ The correct answer is option C.
Heat Transfer
The freon group of refrigerants are
halo-carbon refrigerants
azeotrope refrigerants
inorganic refrigerants
hydro-carbon refrigera
✅ The correct answer is option A.
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
✅ The correct answer is option C.
The product of Reynolds number and Prandtl number is known as
Stanton number
Biot number
Peclet number
Grashoff number
✅ The correct answer is option C.
The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and
carbon dioxide
sulphur dioxide
lithium bromide
R-12
✅ The correct answer is option C.
The specific humidity during dehumidification process
remains constant
increases
decreases
✅ The correct answer is option C.
When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be
positive
negative
zero
none of these
✅ The correct answer is option B.
Emissivity of a body will be equal to its absorptivity at all temperatures.
Yes
No
✅ The correct answer is option B.
Which of the following refrigerant has the lowest boiling point?
Ammonia
Carbon dioxide
Sulphur dioxide
R-12
✅ The correct answer is option B.
When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be
cooled and humidified
cooled and dehumidified
heated and humidified
heated and dehumidifie
✅ The correct answer is option A.