Why can't the efficiency of a heat engine ever be 100 % ?

Under which ideal condition, the efficiency of a carnot engine become 100% ?

What is theoretical efficiency of heat engine ?

Explain why "the efficiency of carnot engine cannot be 100%" ?

Why is a heat engine never 100% efficient ?

What is the efficiency of heat engine ? Write it formula.

What is the efficiency of a carnot's engine working between boiling point and freezing point of water ?

A scientist says that the efficiency of heat engine which work at source temperature 127^@ C and sink temperature 27^@ C is 26 % then ______

What would be the efficiency of the heat engine diagramed as shown below?

What is heat engine ?

The efficiency of a heat engine is defined as the ratio of the mechanical work done by the engine in one cycle to the heat absorbed from the high temperature source . eta = (W)/(Q_(1)) = (Q_(1) - Q_(2))/(Q_(1)) Cornot devised an ideal engine which is based on a reversible cycle of four operations in succession: isothermal expansion , adiabatic expansion. isothermal compression and adiabatic compression. For carnot cycle (Q_(1))/(T_(1)) = (Q_(2))/(T_(2)) . Thus eta = (Q_(1) - Q_(2))/(Q_(1)) = (T_(1) - T_(2))/(T_(1)) According to carnot theorem "No irreversible engine can have efficiency greater than carnot reversible engine working between same hot and cold reservoirs". An inventor claims to have developed an engine working between 600K and 300K capable of having an efficiency of 52% , then -