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Engineering Thermodynamics

Engineering Thermodynamics
Which of the following is the extensive property of a thermodynamic system?

Temperature
Pressure
Volume
Density

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Engineering Thermodynamics
The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)

(v1 + v2)/v1
(v1 + v2)/v2
v2/v1
v1/v2

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Engineering Thermodynamics
The efficiency of Diesel cycle with decrease in cut-off

First increases and then decreases
Increases
Decreases
First decreases and then increases

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Engineering Thermodynamics
The air standard efficiency of an Otto cycle is given by (where r = Compression ratio, and γ = Ratio of specific heats)

1 - (1/ rγ - 1)
1 + (1/ rγ - 1)
1 + rγ - 1
1 - rγ - 1

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Engineering Thermodynamics
The absolute zero temperature is taken as

-273°C
273°C
237°C
-237°C

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Engineering Thermodynamics
During which of the following process does heat rejection takes place in Carnot cycle?

Isothermal expansion
Isothermal compression
Isentropic compression
Isentropic expansion

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