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Heat Engine MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

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3 Questions around this concept.

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Directions: In this question, a word is represented by only one set of numbers as given in any one of the alternatives. The sets of numbers given in the alternatives are represented by two classes of alphabets as in the two matrices, given below. The columns and rows of Matrix (I) are numbered from 0 to 4 and that of Matrix (II) are numbered from 5 to 9. A letter from these matrices can be represented first by its row and next by its column, e.g. 'A' can be represented by 04, 12, etc., and 'N' can be represented by 57, 69, etc. Similarly, you have to identify the set for the word.
ROAD

A

67, 87, 23, 43

B

86, 75, 24, 33

C

79, 99, 41, 42

D

86, 56, 23, 33

Concepts Covered - 0

Heat Engine

A heat engine is a device that converts heat into work continuously through a cyclic process.

The essential parts of a heat engine are

1. Source: It is a reservoir of heat at high temperature and infinite thermal capacity. Any amount of heat can be extracted from it.

2. Working substance: Steam, petrol, etc.

3. Sink: It is a reservoir of heat at low temperature and infinite thermal capacity. Any amount of heat can be given to the sink.

Working of heat engine

As shown in the above figure, The working substance absorbs heat Q₁from the source, does an amount of work W returns the remaining amount of heat (i.e Q₂) to the sink and comes back to its original state and there occurs no change in its internal energy.

To obtain work continuously, the same cycle is repeated over and over again.

The efficiency of the heat engine ( $\eta$ )- It is defined as the ratio of useful work obtained from the engine to the heat supplied to it. The performance of the heat engine is expressed by means of “efficiency”.

$I.e \ \ \eta=\frac{\text { Work done }}{\text { Heat input }}=\frac{W}{Q_{1}}$

For a cyclic process $\Delta U=0$

so From the first law of thermodynamics, $\therefore \Delta Q=\Delta W \quad \text { so } \quad W=Q_{1}-Q_{2}$

$\eta=\frac{Q_{1}-Q_{2}}{Q_{1}}=1-\frac{Q_{2}}{Q_{1}}$

Practically efficiency of an engine is always less than 1.

Study other Related Concepts

Heat Engine Current Topic

Introduction To Thermodynamics

Thermodynamic State Variables And Equation Of State

Thermodynamic Equilibrium

Heat, Internal Energy And Work - Thermodynamics

First Law Of Thermodynamics

Isobaric Process

Isochoric Process

Isothermal Process

Adiabatic Process

Polytropic Process

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