Engineering Thermodynamics MCQs

Question 1

Which of the following statement is correct?

Accepted Answer

All of the above

Answer

The heat and work are boundary phenomena

Answer

The heat and work represent the energy crossing the boundary of the system

Answer

The heat and work are path functions

Question 2

Which of the following statement is correct?

Accepted Answer

All of the above

Answer

The increase in entropy is obtained from a given quantity of heat at a low temperature.

Answer

The change in entropy may be regarded as a measure of the rate of the availability or unavailability of heat for transformation into work.

Answer

The entropy represents the maximum amount of work obtainable per degree drop in temperature.

Question 3

The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by

Accepted Answer

Clausis

Answer

Kelvin

Answer

Joule

Answer

Gay-Lussac

Question 4

Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as

Accepted Answer

First law of thermodynamics

Answer

Zeroth law of thermodynamics

Answer

Second law of thermodynamics

Answer

Kinetic theory of gases

Question 5

Carnot cycle efficiency depends upon

Accepted Answer

Temperature range of operation

Answer

Properties of the medium/substance used

Answer

Condition of engine

Answer

Working condition

Question 6

The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion and v2 = Volume at the end of expansion)

Accepted Answer

$$\frac{{{{	ext{v}}_2}}}{{{{	ext{v}}_1}}}$$

Answer

$$\frac{{{{	ext{v}}_1}}}{{{{	ext{v}}_2}}}$$

Answer

$$\frac{{{{	ext{v}}_1} + {{	ext{v}}_2}}}{{{{	ext{v}}_1}}}$$

Answer

$$\frac{{{{	ext{v}}_1} + {{	ext{v}}_2}}}{{{{	ext{v}}_2}}}$$

Question 7

The gas turbine cycle with regenerator improves

Accepted Answer

Thermal efficiency

Answer

Work ratio

Answer

Avoid pollution

Answer

None of these

Question 8

The efficiency of a Carnot engine depends on

Accepted Answer

Temperatures of source and sink

Answer

Working substance

Answer

Design of engine

Answer

Size of engine

Question 9

Which of the following statement is incorrect?

Accepted Answer

The solid fuels have higher calorific value than liquid fuels

Answer

The liquid fuels have higher calorific value than solid fuels

Answer

A good fuel should have low ignition point

Answer

The liquid fuels consist of hydrocarbons