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Engineering Thermodynamics

Engineering Thermodynamics
The gas constant (R) is equal to the __________ of two specific heats.

Sum
Difference
Ratio
Product

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Engineering Thermodynamics
The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is

848 J/kmol °K
83.14 J/kmol °K
29.27 J/kmol °K
735 J/kmol °K

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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
For a perfect gas, according to Boyle’s law (where P = Absolute pressure, V = Volume and T = Absolute temperature)

V/T = constant, if p is kept constant
T/P = constant, if v is kept constant
P/T = constant, if v is kept constant
P v = constant, if T is kept constant

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Engineering Thermodynamics
During throttling process

All of these
There is no change of internal energy of steam
No work is done by expanding steam
Heat exchange does not take place

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Engineering Thermodynamics
A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as

Cracking
Fractional distillation
Carbonization
Full distillation

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