Explore topic-wise MCQs in Thermal Engineering.

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

1.

Calculate the diagram factor if the areas of theoretical and actual and theoretical indicator diagrams are 1400 kJ and 1800 kJ respectively.

A. 0.51
B. 0.52
C. 0.68
D. 0.78
Answer» E.
Discussion
2.

The actual expansion of the steam is not isentropic due to _____

A. leakage of heat through cylinder walls
B. limited amount of steam
C. No heat leakage
D. boiler inefficiency
Answer» B. limited amount of steam
Discussion
3.

Given that the diagram factor for a particular reciprocating steam engine is 0.70 and the theoretically plotted indicator diagram has an area of 1700 kJ. Determine the area of the actual indicator diagram for the steam engine.

A. 11700 kJ
B. 11800 kJ
C. 11900 kJ
D. 12000 kJ
Answer» D. 12000 kJ
Discussion
4.

What is diagram factor?

A. It is the ratio of the area of theoretical indicator diagram and the area of the actual indicator diagram
B. It is the ratio of area of the actual indicator diagram and the area of the theoretical indicator diagram
C. It is the sum of areas of actual and theoretical indicator diagram
D. It is the ratio of the difference between the areas of the theoretical and actual indicator diagram and the theoretical indicator diagram.
Answer» C. It is the sum of areas of actual and theoretical indicator diagram
Discussion
5.

The rounding observed in the actual indicator diagram is due to valve action.

A. True
B. False
Answer» B. False
Discussion
6.

The actual indicator diagram is different from the hypothetical one due to _____

A. timings of the valve action and pressure drop due to friction in the admission port
B. limited amount of steam
C. Excess amount of steam
D. Low quality valves installation
Answer» B. limited amount of steam
Discussion