Engineering Thermodynamics MCQs

Question 1

According to Regnault's law, the specific heat at constant pressure (cp) and specific heat at constant volume (cv) _________ with the change in pressure and temperature of the gas.

Accepted Answer

Do not change

Answer

Change

Answer

Both (A) and (B)

Answer

None of these

Question 2

The natural petroleum may be separated into

Accepted Answer

Lubricating oil

Answer

Petrol

Answer

Kerosene

Answer

Fuel oil

Question 3

One kg of carbon requires $$\frac{4}{3}$$ kg of oxygen and produces ________ kg of carbon monoxide gas.

Accepted Answer

$$\frac{7}{3}$$

Answer

$$\frac{8}{3}$$

Answer

$$\frac{{11}}{7}$$

Answer

$$\frac{{11}}{3}$$

Question 4

One kg of carbon requires $$\frac{4}{3}$$ kg of oxygen and produces __________ kg of carbon monoxide gas.

Accepted Answer

$$\frac{7}{3}$$

Answer

$$\frac{8}{3}$$

Answer

$$\frac{{11}}{3}$$

Answer

$$\frac{{11}}{7}$$

Question 5

For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be

Accepted Answer

Zero

Answer

Minimum

Answer

Maximum

Answer

Infinity

Question 6

Properties of substances like pressure, temperature and density, in thermodynamic coordinates are

Accepted Answer

Point functions

Answer

Path functions

Answer

Cyclic functions

Answer

Real functions

Question 7

Which of the following processes are thermodynamically reversible?

Accepted Answer

Isothermal and adiabatic

Answer

Throttling

Answer

Free expansion

Answer

Constant volume and constant pressure

Question 8

Entropy change depends on

Accepted Answer

Heat transfer

Answer

Mass transfer

Answer

Change of temperature

Answer

Thermodynamic state

Question 9

Coke is produced

Accepted Answer

When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel

Answer

From the finely ground coal by moulding under pressure with or without a binding material

Answer

When coal is first dried and then crushed to a fine powder by pulverizing machine

Answer

By heating wood with a limited supply of air to a temperature not less than 280°C