Mechanical Engineering - Thermodynamics

36.
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
combustion is at constant volume
expansion and compression are isentropic
maximum temperature is higher
heat rejection is lower
Answer: Option
Explanation:
No answer description is available. Let's discuss.

37.
Liquid fuels have higher calorific value than solid fuels.
Yes
No
Answer: Option
Explanation:
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38.
The free expansion process is __________ non-flow process.
reversible
irreversible
Answer: Option
Explanation:
No answer description is available. Let's discuss.

39.
A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
30 kJ
54 kJ
84 kJ
114 kJ
Answer: Option
Explanation:
No answer description is available. Let's discuss.

40.
The gas constant (R) is equal to the __________ of two specific heats.
sum
difference
product
ratio
Answer: Option
Explanation:
No answer description is available. Let's discuss.