Engineering Thermodynamics MCQs

Question 1

In an isothermal process, the internal energy

Accepted Answer

Remain constant

Answer

Increases

Answer

Decreases

Answer

First increases and then decreases

Question 2

Calorie is a measure of

Accepted Answer

Quantity of heat

Answer

Specific heat

Answer

Thermal capacity

Answer

Entropy

Question 3

Kerosene is distilled at

Accepted Answer

220° to 345°C

Answer

65° to 220°C

Answer

345° to 470°C

Answer

470° to 550°C

Question 4

For the constant pressure and heat input, the air standard efficiency of gas power cycle is in the order

Accepted Answer

Dual cycle, Diesel cycle, Otto cycle

Answer

Otto cycle, Diesel cycle, Dual cycle

Answer

Dual cycle, Otto cycle, Diesel cycle

Answer

Diesel cycle, Otto cycle, Dual cycle

Question 5

The __________ states that change of internal energy of a perfect gas is directly proportional to the change of temperature.

Accepted Answer

Joule's law

Answer

Boyle's law

Answer

Charle's law

Answer

Gay-Lussac law

Question 6

Select the wrong statement

Accepted Answer

A Joule cycle consists of two constant volume and two isentropic processes.

Answer

An Otto cycle consists of two constant volume and two isentropic processes.

Answer

An Ericsson cycle consists of two constant pressure and two isothermal processes.

Answer

All of the above

Question 7

The change of entropy, when heat is absorbed by the gas, is

Accepted Answer

Positive

Answer

Negative

Answer

Positive or negative

Answer

None of these

Question 8

When gas is heated at constant pressure, the heat supplied is utilized in

Accepted Answer

Increasing the internal energy of gas and also for doing some external work

Answer

Increasing the internal energy of gas

Answer

Doing some external work

Answer

None of the above

Question 9

Superheated vapour behaves

Accepted Answer

Approximately as a gas

Answer

Exactly as gas

Answer

As steam

Answer

As ordinary vapour