Engineering Thermodynamics MCQs

Question 1

When a gas is heated at constant pressure

Accepted Answer

Both temperature and volume will increase

Answer

Its temperature will increase

Answer

Its volume will increase

Answer

Neither temperature not volume will increase

Question 2

The efficiency of Diesel cycle with decrease in cut-off

Accepted Answer

Increases

Answer

Decreases

Answer

First increases and then decreases

Answer

First decreases and then increases

Question 3

Otto cycle consists of

Accepted Answer

Two constant volume and two isentropic processes

Answer

Two constant pressure and two isentropic processes

Answer

Two constant volume and two isothermal processes

Answer

One constant pressure, one constant volume and two isentropic processes

Question 4

Stirling cycle consists of

Accepted Answer

Two constant volume and two isothermal processes

Answer

Two constant volume and two isentropic processes

Answer

Two constant pressure and two isothermal processes

Answer

One constant volume, one constant pressure and two isentropic processes

Question 5

Carnot cycle consists of

Accepted Answer

Two isothermal and two isentropic processes

Answer

Two constant volume and two isentropic processes

Answer

Two constant pressure and two isentropic processes

Answer

One constant volume, one constant pressure and two isentropic processes

Question 6

When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.

Accepted Answer

Zero

Answer

$$\frac{1}{5}$$

Answer

$$\frac{4}{5}$$

Answer

1

Question 7

Reversed Joule cycle is known as

Accepted Answer

Bell-Coleman cycle

Answer

Carnot cycle

Answer

Rankine cycle

Answer

Stirling cycle

Question 8

The same volume of all gases would represent their

Accepted Answer

Molecular weights

Answer

Densities

Answer

Specific weights

Answer

Gas characteristic constants

Question 9

If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle

Accepted Answer

Equal

Answer

More

Answer

Less

Answer

Depends on other factors