74) Liquid fuels have lower efficiency than solid fuels.

75) Liquid fuels consist of hydrocarbons.

76) The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.

77) The general gas energy equation is (where Q_{1 - 2} = Heat supplied, dU = Change in internal energy, and W_{1 - 2} = Work done in heat units)

78) The compression ratio for Diesel engines is