Engineering Thermodynamics MCQs

Question 1

Work-done in a free expansion process is

Accepted Answer

Zero

Answer

Minimum

Answer

Maximum

Answer

Positive

Question 2

The ratio of root mean square velocity to average velocity of gas molecules at a particular temperature is

Accepted Answer

1.086

Answer

0.086

Answer

2.086

Answer

4.086

Question 3

According to Gay Lussac’s law for a perfect gas, the absolute pressure of given mass varies directly as

Accepted Answer

Absolute temperature, if volume is kept constant

Answer

Temperature

Answer

Volume, if temperature is kept constant

Answer

None of these

Question 4

The heat and mechanical energies are mutually convertible. This statement was established by

Accepted Answer

Joule

Answer

Boyle

Answer

Charles

Answer

None of these

Question 5

Mond gas is obtained by

Accepted Answer

Passing air and a large amount of steam over waste coal at about 650°C

Answer

Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

Answer

Carbonisation of bituminous coal

Answer

Passing steam over incandescent coke

Question 6

Producer gas is obtained by

Accepted Answer

Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast

Answer

Carbonization of bituminous coal

Answer

Passing steam over incandescent coke

Answer

Passing air and a large amount of steam over waste coal at about 650°C

Question 7

In open cycle gas turbine plants

Accepted Answer

All of the above

Answer

Direct combustion systems is used

Answer

A condenser is used

Answer

The indirect heat exchanger and cooler is avoided

Question 8

The atomic mass of sulphur is

Accepted Answer

32

Answer

12

Answer

14

Answer

16

Question 9

When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

Accepted Answer

Zeroth law of thermodynamics

Answer

First law of thermodynamics

Answer

Second law of thermodynamics

Answer

Kelvin Planck's law