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Engineering Thermodynamics

Engineering Thermodynamics
One kg of carbon requires 4/3 kg of oxygen and produces ________ kg of carbon monoxide gas.

44138
44015
44142
44046

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Engineering Thermodynamics
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

Expansion and compression are isentropic
Maximum temperature is higher
Heat rejection is lower
Combustion is at constant volume

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Engineering Thermodynamics
For the same compression ratio, the efficiency of Diesel cycle is __________ Otto cycle.

Less than
Equal to
Greater than
None of these

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Engineering Thermodynamics
Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, γ = cp/cv, known as adiabatic index, and R = Gas constant)

cv/ cp =R
cp - cv = R
cv = R/ γ-1
Both (B) and (C)

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Engineering Thermodynamics
In a reversible adiabatic process, the ratio of T1/T2 is equal to

(p1/p2)γ - 1/ γ
(v1/v2)γ - 1/ γ
(v2/v1)γ - 1/ γ
(p2/p1)γ - 1/ γ

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Engineering Thermodynamics
A diathermic wall is one which

Encourages thermal interaction
Permits thermal interaction
Discourages thermal interaction
Prevents thermal interaction

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