In compression ignition engines, detonation occurs near the beginning of combustion.

Since the fuel in compression ignition engines is injected at the end of compression stroke, therefore there will be no pre-ignition.

To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.

In compression ignition engines, because of heterogeneous mixture, the rate of pressure rise is comparatively lower.

1/2

1/4

1/8

1/16

(ha-h2)/(h1-h2)

(h2-ha)/(h1-h2)

(h1-h2)/(ha-h2)

(ha-h1)/(h2-h1)

between the combustion chamber and the first heat exchanger

between the first heat exchanger and the secondary compressor

between the secondary compressor and the second heat exchanger

between the second heat exchanger and the cooling turbine

In a vapour absorption refrigerator, the compression of refrigerant is avoided.

Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser.

In a vapour compression refrigerator, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke.

All of the above