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Engineering Thermodynamics

Engineering Thermodynamics
When a gas is heated, change takes place in

Volume
All of the listed here
Temperature
Pressure

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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
Combustion is at constant volume
Maximum temperature is higher
Heat rejection is lower

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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)

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

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Engineering Thermodynamics
The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)

Q1 - 2 = dU/W1 - 2
Q1 - 2 = dU × W1 - 2
Q1 - 2 = dU + W1 - 2
Q1 - 2 = dU - W1 - 2

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Engineering Thermodynamics
The unit of universal gas constant is

None of these

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Engineering Thermodynamics
The oxygen atom is ________ times heavier than the hydrogen atom.

2
32
16
8

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MORE MCQ ON Engineering Thermodynamics

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