Engineering Thermodynamics MCQs

Question 1

Characteristic gas constant of a gas is equal to

Accepted Answer

$${{	ext{C}}_{	ext{p}}} - {{	ext{C}}_{	ext{v}}}$$

Answer

$$\frac{{{{	ext{C}}_{	ext{p}}}}}{{{{	ext{C}}_{	ext{v}}}}}$$

Answer

$$\frac{{{{	ext{C}}_{	ext{v}}}}}{{{{	ext{C}}_{	ext{p}}}}}$$

Answer

$${{	ext{C}}_{	ext{p}}} + {{	ext{C}}_{	ext{v}}}$$

Question 2

The variables which control the physical properties of a perfect gas are

Accepted Answer

All of these

Answer

Pressure exerted by the gas

Answer

Volume occupied by the gas

Answer

Temperature of the gas

Question 3

According to Avogadro's Hypothesis

Accepted Answer

The molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature

Answer

The sum of partial pressure of mixture of two gases is sum of the two

Answer

Product of the gas constant and the molecular weight of an ideal gas is constant

Answer

Gases have two values of specific heat

Question 4

The following cycle is used for air craft refrigeration

Accepted Answer

Reversed Brayton cycle

Answer

Brayton cycle

Answer

Joule cycle

Answer

Carnot cycle

Question 5

In closed cycle gas turbine, the air is compressed

Accepted Answer

Isentropically

Answer

Isothermally

Answer

Polytropically

Answer

None of these

Question 6

A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is

Accepted Answer

327°C

Answer

54°C

Answer

108°C

Answer

654°C

Question 7

The amount of heat required to raise the temperature of __________ water through one degree is called kilojoules.

Accepted Answer

1000 g

Answer

1 g

Answer

10 g

Answer

100 g

Question 8

The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

Accepted Answer

A temperature of -273.16°C

Answer

A temperature of 0°C

Answer

A temperature of 273°K

Answer

A negative pressure and 0°C temperature

Question 9

Work done in a free expansion process is

Accepted Answer

Zero

Answer

Maximum

Answer

Minimum

Answer

Positive