Mechanical Engineering Test Preparations On Thermodynamics Part 1
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Test Preparation on Mechanical Engineering Test Preparations On Thermodynamics Part 1
1.
The compression ratio for Diesel engines is
1
3 to 6
2
5 to 8
3
15 to 20
4
20 to 30
2.
In an is a thermal process
1
there is no change in temperature
2
there is no change in enthalpy
3
there is no change in internal energy
4
all of these
3.
Which of the following is the correct statement of the second law of thermodynamics?
1
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.
2
It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.
3
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.
4
all of the above
4.
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
1
combustion is at constant volume
2
expansion and compression are isentropic
3
maximum temperature is higher
4
heat rejection is lower
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