Embibe Experts Solutions for Exercise 4: Assignment

A process can be reversible if

The value of $\eta$ may lie between

If a Carnot engine works between $127°\mathrm{C}$ and $527°\mathrm{C},$ then its efficiency is

If the temperature of sink is at absolute zero, then the efficiency of Carnot engine will be

A Carnot engine whose sink is at $300 \mathrm{K}$ has an efficiency of $50\%.$ By how much should the temperature of source be increased so as the efficiency becomes $70\% ?$

A Carnot engine takes $6000 \mathrm{cal}$ of heat from a reservoir at $627°\mathrm{C}$ and gives it to a sink at $27°\mathrm{C}.$ The work done by the engine is

In practice, all heat engines have efficiency less than that of a Carnot engine because

A Carnot engine is working in such a temperature of sink that its efficiency is maximum and never changes with any non-zero temperature of source. The temperature of sink will most likely to be