Embibe Experts Solutions for Chapter: Heat Engine, Exercise 1: Exercise 1

The first law of thermodynamics is a statement of 

In a given process for an ideal gas, $dW=0$ and $dQ<0$. Then, for the gas

A hot cup of coffee is kept on the table. After some time it attains a thermal equilibrium with the surroundings. By considering the air molecules in the room as a thermodynamic system, which of the given is true ?

Assertion: First law of thermodynamics can be applied only for an ideal or real gas system.

Reason: First law of thermodynamics is nothing but law of conservation of energy.

Match the following:

The correct answer is

The temperature of source and sink of a heat engine are ${127}^{o}C$ and ${27}^{o}C$ , respectively. An inventor claims its efficiency to be 26%, then

A Carnot engine working between 450 K and 600 K has a work output of 300 J/cycle. The amount of heat energy supplied to the engine from the source in each cycle is

An engine has an efficiency of 1/3. the amount of work this engine can perform per kilocalorie of heat input is