Answer:
Yes
Step-by-step explanation:
Given Data
Temprature of source=750°c=1023k
Temprature of sink =0°c=273k
Work produced=3.3KW
Heat Rejected=4.4KW
Efficiency of heat engine(η)=

and
Heat Supplied


η=

η=42.85%
Also the maximum efficiency of a heat engine operating between two different Tempratures i.e. Source & Sink
η=1-

η=1-

η=73.31%
Therefore our Engine Efficiency is less than the maximum efficiency hence the given claim is valid.