Explore topic-wise MCQs in Thermodynamics Questions and Answers.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

A piston cylinder contains 3kg of air at 20°C and 300 kPa. It is now heated up in a constant pressure process to 600 K. Find the heat transfer.

A. 941 kJ
B. 951 kJ
C. 961 kJ
D. 971 kJ
Answer» B. 951 kJ
Discussion
2.

A vertical cylinder fitted with a piston contains 5 kg of R-22 at 10°C. Heat is transferred causing the piston to rise until the volume has doubled. Additional heat is transferred until the temperature inside reaches 50°C, at which point the pressure inside the cylinder is 1.3 MPa. Find the work done.

A. 34.1 kJ
B. 44.1 kJ
C. 54.1 kJ
D. 64.1 kJ
Answer» B. 44.1 kJ
Discussion
3.

A steam turbine has an inlet of 2 kg/s water at 1000 kPa, 350°C and velocity of 15 m/s. The exit is at 100 kPa, x = 1 and very low velocity. Find the power produced.

A. 664.6 kW
B. 764.6 kW
C. 864.6 kW
D. 964.6 kW
Answer» E.
Discussion
4.

A steam turbine has an inlet of 2 kg/s water at 1000 kPa, 350°C and velocity of 15 m/s. The exit is at 100 kPa, x = 1 and very low velocity. Find the specific work.

A. 382.3 kJ/kg
B. 482.3 kJ/kg
C. 582.3 kJ/kg
D. 682.3 kJ/kg
Answer» C. 582.3 kJ/kg
Discussion
5.

Air at 600 K flows with 3 kg/s into a heat exchanger and out at 100°C. How much (kg/s) water coming in at 100 kPa, 20°C can the air heat to the boiling point?

A. 0.37 kg/s
B. 0.17 kg/s
C. 0.27 kg/s
D. 0.57 kg/s
Answer» D. 0.57 kg/s
Discussion
6.

Superheated R-134a at 0.5 MPa, 20°C is cooled in a piston-cylinder at constant temperature to a final two-phase state with quality of 50%. The refrigerant mass is 5 kg, and during the process 500 kJ of heat is removed. Find the necessary work.

A. -67.9 kJ
B. -77.9 kJ
C. -87.9 kJ
D. -97.9 kJ
Answer» D. -97.9 kJ
Discussion