Refrigeration and Air Conditioning

Pick up the wrong statement. A refrigerant should have

• Tow specific heat of liquid

• high boiling point

• high latent heat of vaporisation

• higher critical temperature

• low specific volume of vapour

A standard ice point temperature corresponds to the temperature of

• water at 0°C

• ice at - 4°C

• solid and dry ice

• mixture of ice, water and vapour under equilibrium conditions under NTP conditions

• mixture of ice and water Under equilibrium conditions

Vapour compression refrigeration is some what like

• Carnot cycle

• Rankine cycle

• reversed Camot cycle

• reversed Rankine cycle

• none of the above

Which of the following cycles uses air as the refrigerant

• Ericsson

• Stirling

• Carnot

• Bell-coleman

• none of the above

Ammonia-absorption refrigeration cycle requires

• very little work input

• maximum work input

• nearly same work input as for vapour compression cycle

• zero work input

• none of the above

An important characteristic of absorption system of refrigeration is

• noisy operation

• quiet operation

• cooling below 0°C

• very little power consumption

• its input only in the form of heating

The relative coefficient of performance is

• actual COP/fheoretical COP

• theoretical COP/actual COP

• actual COP x theoretical COP

• 1-actual COP x theoretical COP

• 1-actual COP/fheoretical COP

Clapeyron equation is a relation between

• temperature, pressure and enthalpy

• specific volume and enthalpy

• temperature and enthalpy

• temperature, pressure, and specil volume

• temperature, pressure, specific volur and'enthalpy

Clapeyron equation is applicable for registration at

• saturation point of vapour

• saturation point of liquid

• sublimation temperature

• triple point

• critical point

In vapour compression cycle, the conditii of refrigerant is saturated liquid

• after passing through the condenser

• before passing through the condensei

• after passing through the expansion throttle valve

• before entering the expansion valve

• before entering the compressor