Q. A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

View solution

Q. Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

View solution

Q. Which of the following statement is correct for ammonia as a refrigerant?

View solution

Q. The conditioned air supplied to the room must have the capacity to take up

View solution

Q. The process of removing moisture from the air, without change in its dry bulb temperature, is called dehumidification.

View solution

Q. The specific humidity during dehumidification process

View solution

Q. Which of the following refrigerant has the lowest freezing point?

View solution

Q. For a white body, absorptivity (α ) = 0, reflectivity (ρ) = 1 and transmittivity (τ) = 0.

View solution

Q. Fouling factor is used

View solution

Q. The natural convection air cooled condensers are used in

View solution

Q. The process, generally used in winter air-conditioning to warm and humidity the air, is called

View solution

Q. At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.

View solution

Q. Bell-Coleman cycle is a

View solution

Q. Which of the following refrigerant has the highest freezing point.

View solution

Q. Air conditioning means

View solution

Q. The emissivity for a black body is

View solution

Q. Which of the following would lead to a reduction in thermal resistance?

View solution

Q. The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to

View solution

Q. The curved lines on a psychrometric chart indicates

View solution

Q. During humidification process, __________ increases.

View solution