Can the Carnot engine be realised in practice?

Can a Carnot engine be realised in practice ?

Carnot engine is

Carnot engine is

Carnot engine is

Which of the following conditions of the Carnot ideal heat engine can be realised in practice?

Define a black body and explain how it can be realised in practice.

What is carnot engine ?

Figure shows some velocity versus time graphs : , , , Only some of these can be realised in practice.These are:

What is a black body ? How can it be realised in practice ?

Why a heat engine with 100 % efficiency can never be realised in practise ?