Steam Boilers, Engines, Nozzles and Turbines
The relative efficiency is defined as the

Ratio of brake power to the indicated power
Ratio of thermal efficiency to Rankine efficiency
Product of thermal efficiency and Rankine efficiency
Ratio of heat equivalent to indicated power to the energy supplied in steam

ANSWER DOWNLOAD EXAMIANS APP

Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

From a metal wall from one medium to another
Heat is transferred by bleeding some gases from furnace
By direct mixing
From heating an intermediate material and then heating the air from this material

ANSWER DOWNLOAD EXAMIANS APP