Q. In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

View solution

Q. Which of the following statement is correct?

View solution

Q. The horizontal and uniformly spaced lines on a psychrometric chart indicates relative humidity.

View solution

Q. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is

View solution

Q. The process of adding moisture to the air, without change in its dry bulb temperature, is known as humidification.

View solution

Q. In case of liquids and gases, the heat transfer takes place according to

View solution

Q. The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)

View solution

Q. The radiation emitted by a black body is known as

View solution

Q. Which of the following refrigerant has the maximum ozone depletion potential in the stratophere?

View solution

Q. Which of the following statement is correct?

View solution

Q. According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.

View solution

Q. In electrolux refrigerator

View solution

Q. Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

View solution

Q. The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.

View solution

Q. Which of the following statement is correct?

View solution

Q. 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

View solution

Q. If a gas is to be liquified, its temperature must be

View solution

Q. The thermostatic expansion valve is used in __________ type of evaporators.

View solution

Q. Thermal conductivity of a material may be defined as the

View solution

Q. During sensible heating of air, specific humidity remains constant.

View solution