Previous Year Thermodynamics Objective Questions Answers

by

11. Which of the following are intensive properties?

Read Also- IC Engine: Objective Questions

  1. Kinetic Energy
  2. Pressure
  3. Entropy
  4. Thermal Conductivity

A. 1 and 3

B. 1 and 4

C. 2 and 4

D. 2, 3 and 4

Click for Answer/Explanation

Correct Answer is C

Properties that are independent of mass.

12. When a real gas undergoes Joule-Thomson expansion the temperature –

A. may remain constant

B. always decreases

C. always increases

D. may increase or decrease

Click for Answer/Explanation

Correct Answer is D

13. The specific volume of water when heated from 0 °C –

A. decreases steadily

B. increases steadily

C. first increases and then decreases

D. first decreases and then increases

Click for Answer/Explanation

Correct Answer is D

We know water at 4 °C has maximum density and so minimum specific volume.

Hence, water on heating attains a minimum specific volume at 4 °C. On further heating i.e. above 4 °C specific volume increases.

14. An insulated box containing 0.5 kg of a gas having Cv = 0.98 kJ/kg-K falls from a balloon 4 km above the earth’s surface. The temperature rise of the gas when the box hits the ground is –

A. 25 K

B. 40 K

C. 55 K

D. 75 K

Click for Answer/Explanation

Correct Answer is B

Using,

Change in internal energy = Change in potential energy

mCvdT = mgh

Read Also- Theory of Machines: Simple Mechanisms

15. Which one of the following represents the open thermodynamic system?

A. Centrifugal Pump

B. Bomb Calorimeter

C. Pressure Cooker

D. Manual Ice cream freezer

Click for Answer/Explanation

Correct Answer is A

Pages: 1 2 3 4 5

Leave a comment