Mechanical Engineering - Thermodynamics

21.
Which of the following statement is correct?
The increase in entropy is obtained from a given quantity of heat at a low temperature.
The change in entropy may be regarded as a measure of the rate of the availability or unavailability of heat for transformation into work.
The entropy represents the maximum amount of work obtainable per degree drop in temperature.
all of the above
Answer: Option
Explanation:
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22.
The elements are made up of minute and chemically invisible particles as atoms.
True
False
Answer: Option
Explanation:
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23.
All perfect gases change in volume by 1 / 273th of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called
Boyle's law
Charles' law
Gay-Lussac law
Joule's law
Answer: Option
Explanation:
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24.
A good fuel should have __________ ignition point.
high
low
Answer: Option
Explanation:
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25.
According to Kelvin-Planck's statement, a perpetual motion of the __________ is impossible.
first kind
second kind
Answer: Option
Explanation:
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