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Engineering Thermodynamics

Engineering Thermodynamics
The compression ratio for Diesel engines is

3 to 6
15 to 20
5 to 8
20 to 30

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Engineering Thermodynamics
In a no flow reversible process for which p = (-3V + 15) × 105 N/m², V changes from 1 m3 to 2 m3. The work done will be about

10 × 10⁵ joules
1 × 10⁵ joules
10 × 10⁵ kilo joules
100 × 10⁵ joules

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Engineering Thermodynamics
A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is

+60 kJ
-40 kJ
-140 kJ
-80 kJ

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Engineering Thermodynamics
When the gas is cooled at constant pressure,

Both temperature and volume decreases
Both temperature and volume increases
Its volume increases but temperature decreases
Its temperature increases but volume decreases

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Engineering Thermodynamics
The hard coke is obtained when carbonization of coal is carried out at

500° to 700°C
900° to 1100°C
300° to 500°C
700° to 900°C

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Engineering Thermodynamics
The basis for measuring thermodynamic property of temperature is given by

Second law of thermodynamics
Zeroth law of thermodynamics
Third law of thermodynamics
First law of thermodynamics

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