Engineering :: Refrigeration and Air conditioning

@ : Home > Mechanical Engineering > Refrigeration and Air conditioning

161.

When the higher temperature is fixed, the COP of a refrigerating machine can be improved by

A.	Operating the machine at higher speeds	B.	Operating the machine at lower speeds
C.	Raising the higher temperature	D.	Lowering the higher temperature
E.	None of the above

162.

One tonne of refrigeration is equivalent to SI units of

163.

The freezing point of ammonia is

164.

Which of the following refrigerant is the cheapest?

165.

Which of the following refrigerant is highly toxic?

166.

If space occupied by the refrigerating plant and cost is the major consideration, which of the following refrigerant will be preferred?

167.

Air for air conditioning of aircraft cabin is obtained by

A.	Compressing ambient air	B.	Recycling cabin air
C.	Dehumidifying cabin air	D.	Bleeding from air compressor
E.	Turbine exhaust

168.

Refrigerant 717 is

169.

Refrigerant 744 is

170.

Refrigerant R-40 is