Explore key principles of thermodynamics in this NCKUME Practice Quiz. Assess your understanding of entropy, the ideal gas law, heat engines, and thermal efficiency. This quiz is designed to enhance your knowledge and skills in thermodynamics, crucial for students and professionals in physics.
KJ/kg.K
J/K.mol
J/K
None of these options are correct.
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According to the first law, they must be the same.
There is not enough information - you didn't tell me what W is.
QL from the reversible engine will be less than QL from the irreversible one.
QL from the reversible engine will be more than QL from the irreversible one.
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I don't have enough information - I require the compression ratio.
I don't have enough information - I require something else.
50%
80%
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The first law is just a mathematical equation, and cannot say anything about anything - it can't speak.
The 1st Law may be satisfied.
The 1st Law is not satisfied, because there is no fuel.
(DON'T PICK THIS ONE. IT'S ONE OF THE ABOVE OPTIONS)
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The 2nd law is violated because we can't move energy from a hot place to a cold place while producing work.
The 2nd law is violated because if the exhaust gas temperature is negative, the efficiency is larger than 1.
The 2nd law may be satisfied.
(Not this one. Try again. Pick one of the others)
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This was a homework question. If I did the homework and got the answer right, but I don't get this answer right, Prof. Smith won't be suspicious at all.
100,000 kJ
100,000 kW
20,000 kJ.
J/kg
J/K
K/kg
None of these options are correct.
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The quality will increase, and the entropy will increase.
The quality will remain constant, and the entropy will increase.
The quality will increase, but the entropy will remain constant.
Both the entropy and quality remain the same.
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There is no heat transfer in this process.
We are removing heat, which produces a decrease in temperature.
We are adding heat, which produces a decrease in temperature because reasons.
There is not enough information here.
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Option 1
Option 2
Option 3
None of these are correct.
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137.5 C, dS = 0.1794 kJ/K
137.5 C, dS = 0.0359 kJ/kg.K
137.5 C, dS = 0.5092 kJ/kg.K
This is an engineering mathematics question, not a thermodynamics question. (DON'T PICK THIS)
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There is no heat transfer as T is the same at the inlet and exit.
We must have heat coming into the device.
We must have heat leaving the device.
None of these options are correct. (Really? Go on, pick this one)
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KJ/kg.K
KJ/kg
KJ/K
None of these options are possible.
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87.1 kW
92.1 kW
80.25 kW
Another homework question - I can relax because I won't see these on the exam. (WRONG)
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550 W
500 W
250 W
None of these are correct. The units are all wrong.
The temperature is constant during the pumping process.
The stuff going through the pump is an incompressible fluid.
The pump is adiabatic.
All of these options are correct.
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He is wrong - the quality at the exit of the turbine is only a function of T, not P.
He is wrong - the quality will be reduced because the gas leaving the boiler is less superheated.
He is right - the higher pressure means higher energy, which means a higher x at the exit.
He is right because he is the boss and the boss is always right.
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0.24
0.784
0.56
None of these answers are correct.
0.97
0.65
Not enough information to answer this question.
0.347
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Because liquids require less energy to pump than gasses do.
The Brayton and Rankine cycles have the same theoretical efficiency for the same values of TH and TL.
Because water holds more energy per unit kg than air does.
None of these answers are correct.
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525 kJ/kg
475 kJ/kg
575 kJ/kg
None of these options are close enough to my answer, and my answer is correct. (NOT THIS ONE)
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~21,000 K
~ 2290 K
~2000 K
I didn't get to see the example Prof. Smith provided, but I can relax - it won't be on the test.
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