269) In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

reversed Carnot cycle

reversed Joule cycle

reversed Brayton cycle

reversed Otto cycle

Answer is:

reversed Brayton cycle

Right

Wrong

Answer is:

Right

Wrong

Answer is:

freezing at the expansion valve

restriction to refrigerant flow

corrosion of steel plates

all of these

Answer is:

Explanation:

Moisture should be removed from refrigerants to avoid
* freezing at the expansion valve
* restriction to refrigerant flow
* corrosion of steel plates

The value of C.O.P. is always greater than one.

In a vapour compression system, the condition of refrigerant before entering the compressor is dry saturated vapour.

The space between the saturated liquid line and saturated vapour line, in a pressure enthalpy chart, is wet vapour region.

none of the above

Answer is: