Refrigeration Activity

A jet fighter travelling at 950 km/h needs a cooling system of capacity..

• 2 to 4 TR

• 4 to 8 TR

• 8 to 10 TR

• 10 to 20 TR

Tags

NGSS.HS-PS3-4

During a refrigeration cycle, heat is rejected by the refrigerants in a ...

• compressor

• condenser

• evaporator

• expansion valve

Tags

NGSS.HS-PS3-4

In a vapour compression refrigeration system, subcooling the liquid refrigerant is to...................coefficient of performance.

• increase

• decrease

• both

• none

Tags

NGSS.HS-PS3-4

In a vapour compression refrigeration system, the lowest temperature during the cycle occurs after...

• compression

• condensation

• expansion

• evaporation

In aqua-ammonia absorption refrigeration system, incomplete rectification lead to accumulation of water in

• condenser

• evaporator

• absorber

• none

The refrigerant R-717 is

• air

• water

• ammonia

• carbon dioxide

Tags

NGSS.HS-PS3-4

Environment protection agencies have advise aganist the use of chloro-fluoro-carbon (CFC) refrigerants since

• these react with water and cause acid rain

• these react with plants and cause green house effect

• these react with oxygen and cause its depletion

• these react with ozone layer

The compression device used in a steam jet refrigeration system is a

• vapour compressor

• steam ejector

• diffuser

• liquid pump