[" An ideal heat engine can be "100%" efficient "],[" if its sink is at "]

Why is a heat engine never 100% efficient ?

A fritionless heat engine can be 100% efficient only if its exhaust temperature is

A frictionless heat engine can be 100% efficient only if its exhaust temperature is

Why can't a machine be 100% efficient?

Why efficiency of ideal heat engine cannot be 100%?

Explain why a Carnot engine cannot have 100% efficiency?

Assertion: The efficiency of a carnot engine cannot be 100% . Reason: This is because sink of heat engine cannot be maintained at 0 K .

Even Carnot engine cannot give 100% efficiency because we cannot