RAC-Basics of Refrigeration (CO1)

The Reversed Carnot Refrigeration Cycle Processes are:

• Compression-Heat addition-Expansion-Heat rejection

• Heat addition-Compression-Heat rejection-Expansion

• Heat addition-Expansion-Heat rejection-compression

• Compression-Expansion-Heat addition-Heat rejection

1 Ton of Refrigeration equals

• 42,000 Btu/min

• 4.2 kW

• 3500 W

• 3516 kJ

COP of aircraft refrigeration systems low because:

• Lack of refrigerant

• Speed of aircraft is high

• No phase change of air

• Heat transfer difficult at higher altitudes

Which thermodynamic device exhibits highest COP?

• Heat pump

• Heat engine

• Refrigerator

• Compressor

Bootstrap aircraft cooling system has

• 1 heat exchanger & 1 compressor

• 2 heat exchangers & 2 compressors

• 2 heat exchangers & 1 compressor

• 1 heat exchanger & 2 compressor

Identify the aircraft cooling system:

• Regenerative cooling system

• Reduced ambient cooling system

• Simple cooling system

• Bootstrap cooling system

A Carnot Refrigerator operates between 250K and 300K. Its COP is

• 6

• 5

• 1.2

• 2.4

Identify the aircraft cooling system:

• Regenerative cooling system

• Reduced ambient cooling system

• Simple cooling system

• Bootstrap cooling system

Which cooling system is used for Supersonic aircrafts?

• Bell Coleman cooling system

• Bootstrap cooling system

• Reduced ambient cooling system

• Simple air cooling system

Identify the aircraft cooling system:

• Regenerative cooling system

• Reduced ambient cooling system

• Simple cooling system

• Bootstrap cooling system