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Eng0013 > Thermodynamics > Flashcards

Thermodynamics Flashcards

1
Q

What is an isolated system?

A

No heat or matter is transferred

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2
Q

What is a closed system?

A

Where there is an exchange of heat energy

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3
Q

What is a open system?

A

When there is an exchange of both heat energy and matter

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4
Q

First law of thermodynamics

A

Change in Internal Energy = Energy transferred to system - Work Done by System

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5
Q

What equation is used for Non-Flow Processes?

A

PV = NKT

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6
Q

What is the 1st Law of Thermodynamics for a isothermal process?

A

Q = W

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7
Q

What is the equation for the change in internal energy for a non-flow process?

A

Change in internal energy = Q - PChangeinVol

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8
Q

Change in internal energy for an isochoric process

A

Change in internal energy = Q

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9
Q

What is the change in internal energy for an adiabatic process?

A

-W

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10
Q

What is the Molar Heat Capacity?

A

The heat energy required to raise the temperature of 1mol of an ideal gas to be raised by 1K

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11
Q

What is the Molar Heat Capacity equation for an isochoric equation?

A

Change in Internal Energy = nCvChangeinTemo

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12
Q

What is the Molar Heat Capacity equation for an isobaric equation?

A

Change in Internal Energy = nCpChange in temp - pChangeinVol

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13
Q

What is Enthalpy(H)

A

It is the heat energy transferred in a process at constant pressure

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14
Q

What is the Enthalpy equation?

A

Change in H = Change in internal energy + pchangeinV

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15
Q

How to use a PV graph to find work?

A

The work is the area under the PV diagram

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16
Q

How to identify an isotherm?

A

The value of PV is always constant

17
Q

What difference is there between an isotherm and adiabatic curve?

A

An adiabatic curve is steeper than a isotherm curve

18
Q

How to identify an isochoric process?

A

An isochoric is a straight vertical line on a PV graph

19
Q

How to identify an isobaric process?

A

A straight horizontal line on a PV graph

20
Q

How to calculate the net Work Done in a cyclic process?

A

Area enclosed within the loop

21
Q

Process of 4-stroke Petrol Engine?

A

Induction, Compression, Expansion and Exhaust

22
Q

What is the Second Law of Thermodynamics?

A

The entropy of a closed system always increase

23
Q

What is Entropy?

A

A measure of disorder in a system
Given time a system will always tend towards disorder
Happens spontaneously and does not need energy

24
Q

How does heat flow work in a source?

A

A heat source will always flow towards a heat sink
Thermal equilibrium is the state of highest entropy

25
Q

How does the heat engine process work?

A

Source at Temperature Th provides heat energy Qh
Heat allows process to occur which does Work
Sink at Temperature Tc absorbs heat energy Qc

26
Q

How to find efficiency of heat engine process?

A

Qh -Qc / Qh

27
Q

How to find theoretical maximum efficiency?

A

Th - Tc / Th

28
Q

What is the Coefficient of Performance?

A

A measure of how much heat energy is transferred for the work done

29
Q

What is the CoP for a refrigerator or air conditioner?

A

Qc / Qh - Qc
or
Tc / Th - Tc

30
Q

What is the CoP for a heat pump?

A

Qh/Qh-Qc
or
Th/Th-Tc

Eng0013 (13 decks)

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