Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Mechanical FE Exam > Thermodynamics & Heat Transfer > Flashcards

Thermodynamics & Heat Transfer Flashcards

1
Q

Thermo: Properties of Substances - Phases of a Pure Substance

Ideal gas law (formula)

A

pV = nRT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Thermo: Properties of Substances - Phases of a Pure Substance

What is a p-v-T diagram?

A

3D surface that predicts a substance’s phase based on the properties of presure, specific volume, and temp.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Thermo: Properties of Substances - Phases of a Pure Substance

What is the vapor dome?

A

The bell-shaped diving line at the liquid-vapor region.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Thermo: Properties of Substances - Phases of a Pure Substance

What other diagrams can be derived from a p-v-T diagram?

A

Pressur-Volume Phase Diagram (2D projection of the 3D p-v-T diagram, where one property is held constant. In this case, that is temperature.)

Vapor Dome Diagram

These are phase diagrams or equiplibrium diagrams.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Thermo: Properties of Substances - Phases of a Pure Substance

Define the saturated liquid line?

A

Left-hand part of the vapor dome curve that separates the liquid phase from the liquid-vapor phase.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Thermo: Properties of Substances - Phases of a Pure Substance

Define saturated vapor line?

A

Right-hand part of the vapor dome curve that separates the liquid-vapor phase from the vapor phase.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Thermo: Properties of Substances - Phases of a Pure Substance

Define isobars?

A

Lines of constant pressure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Thermo: Properties of Substances - Phases of a Pure Substance

Above the vapor dome, the phase is what?

A

Gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Thermo: Properties of Substances - Phases of a Pure Substance

What is the critical isobar?

A

The dividing line between liquid and gas that intersects the topmost part of the vapor dome**.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Thermo: Properties of Substances - Phases of a Pure Substance

What is the critical point?

A

The highest point of the vapor dome.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Thermo: Properties of Substances - Phases of a Pure Substance

What is the triple point?

A

A unique state at which solid, liquid, and gaseous phases can coexist.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Thermo: Properties of Substances - Phases of a Pure Substance

Define isotherms?

A

The lines of constant temperature.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Thermo: Properties of Substances - Phases of a Pure Substance

‘1. A substance is a subcooled liquid if:

A

its temperature is less than the saturation temperature corresponding to its pressure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Thermo: Properties of Substances - Phases of a Pure Substance

‘2. A substance is in the liquid-vapor region if:

A

its temperature is equal to the saturation temperature corresponding to its pressure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Thermo: Properties of Substances - Phases of a Pure Substance

‘3. A substance is a superheated vapor if:

A

its temperature is greater than the saturation temperature corresponding to its pressure.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Thermo: Properties of Substances - Phases of a Pure Substance

‘4. A substance is a subcooled liquid if:

A

its pressure is greater than the saturation pressure corresoponding to its temperature.

16
Q

Thermo: Properties of Substances - Phases of a Pure Substance

‘5. A substance is in the liquid-vapor region if:

A

its pressure is equal to the saturation pressure corresponding to its temperature.

17
Q

Thermo: Properties of Substances - Phases of a Pure Substance

‘6. A substance is a superheated vapor if:

A

its pressure is less than the saturation pressure corresponding to its temperature.

18
Q

Thermo: Properties of Substances - State Functions (Properties)

Define intensive properties?

A

Properties that are independent of the amount of a substance present.

19
Q

Thermo: Properties of Substances - State Functions (Properties)

Define extensive properties?

A

Properties that are dependent of the amount of a substance present.

20
Q

Thermo: Properties of Substances - State Functions (Properties)

Examples of intensive properties:

A

temperature, pressure, stress

21
Q

Thermo: Properties of Substances - State Functions (Properties)

Examples of extensive properties:

A

volume, strain, charge, mass

22
Q

Thermo: Properties of Substances - State Functions (Properties)

Rankine scale (formula)

A

Tf + 459.67 degrees

23
Q

Thermo: Properties of Substances - State Functions (Properties)

Kelvin scale (formula)

A

Tc + 273.15 degrees

24
Q

Thermo: Properties of Substances - State Functions (Properties)

Define enthalpy?

A

Represents the total useful energy of a substance.

25
Q

Thermo: Properties of Substances - State Functions (Properties)

Define entropy?

A

A measure of the energy that is no longer available to perform useful work within the current environment.

26
Q

Thermo: Properties of Substances - State Functions (Properties)

Formula for heat energy (Q)?

A

Q = mcΔT

27
Q

Thermo: Properties of Substances - State Functions (Properties)

Formula for quality (x)?

A

x = Mvapor / Mvapor + Mliquid

28
Q

Thermo: Properties of Substances - Ideal Gases

Another ideal gas relationship for pressure, volume, and temperature? (formula)

A

p1V1 / T1 = p2V2 / T2

29
Q

Thermo: Properties of Substances - Ideal Gases

How can you calculate the number of moles (n) of a substance?

(explanation and formula)

A

Using the mass (m) and molecular weight (MW).

n = m / MW

30
Q

Thermo: Properties of Substances - Ideal Gases

Define isentropic processes.

A

entropy is constant

31
Q

Thermo: Properties of Substances - Speed of Sound & Mach

What is a Mach number? (definition)

A

The ratio of an object’s speed to the speed of sound in the medium through which the object is traveling.

Mechanical FE Exam (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions