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Module 2 - Phyics B1 > 2.3 Thermodynamics > Flashcards

2.3 Thermodynamics Flashcards

1
Q

What is 0°C in Kelvin?

A

°C + 273.15

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2
Q

What is the equation to work out °C from °F?

A

(5/9°F)-32

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3
Q

What is the equation to work out degrees F from C?

A

(9/5°C)+32

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4
Q

At what temperature does mercury freeze?

A

-34°C

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5
Q

What is the purpose of a Wheatstone Bridge circuit?

A

It is a circuit that changes resistance in response to a change in temperature.

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6
Q

What are the common metals used in a Thermocouple?

A

Copper and Constantan

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7
Q

What is 1 Calorie in Joules?
(Calorie - Amount of heat needed to raise temperature of 1kg of water by 1 degree C)

A

4186J

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8
Q

What is 1 BTU in Joules?
(BTU - Amount of heat needed to raise temperature of 1lb of water by 1 degree F)

A

1055J (0.252 Calorie)

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9
Q

What is the formula to calculate the heat capacity?

A

Q = mC Δ T

Q = Heat gained or lost
m = Mass
C = Specific heat of substance
T = Temperature

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10
Q

What is the formula for latent heat?

A

Q = mL

M = Mass
L = Specific latency

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11
Q

What are the three types of heat transfer?

A

Conduction
Convection
Radiation

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12
Q

What is the temperature at which Water has the greatest density?

A

4°C

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13
Q

What is Entropy?

A

A quantitative measure of the amount of thermal energy not available to do work for a closed system. It is the unavailable energy.

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14
Q

How many laws are there in thermodynamics?

A

Four

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15
Q

What is the First law?

A

The total increase in the energy of a system is equal to the increase in thermal energy plus the work done on the system.

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16
Q

What is the Second law?

A

Heat energy cannot be transferred from an object at a lower temperature to an object at a higher temperature without the addition of energy.

17
Q

What is an Adiabatic process?

A

One with no heat transfer into or out of a system.

18
Q

What is an Isochoric process?

A

It is a constant volume process.

19
Q

What is an Isobaric process?

A

It is a constant pressure process.

20
Q

What is an Isothermal process?

A

It is a constant temperature process.

21
Q

What is Enthalpy?

A

It is the amount of energy in a gas capable of doing work.
It is a combination of internal energy, pressure and volume due to whenever a gas is heated.

22
Q

What is an Isentropic process?

A

It is a constant entropy process. It is a reversible process due to no energy dissipating as heat.

23
Q

What is Boyle’s law?

A

The Volume of a given mass of gas at a constant temperature is inversely proportional to pressure.

PV = Constant
P1V1 = P2V2

24
Q

What is Avogadro’s law?

A

It states that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.

25
Q

What is Charles’ law?

A

A volume of given mass of gas at constant pressure increases 1/273 of it’s volume at 0°C for every 1°C rise in temperature.

26
Q

What is Gay-Lussac’s law?

A

The pressure of a given mass of gas at constant volume is proportional to it’s temperature.

P/T = Constant

P1 P2
=
T1 T2

27
Q

What is the Brayton cycle?

A

Continuous combustion cycle for modern gas turbine engines.

28
Q

What is the SI unit for Heat?

A

Joule

29
Q

What is the relative density of copper (CU)?

A

8.9

30
Q

What is the unit of density?

A

KG per cubic metre

31
Q

If a fluid flows easily under it’s own weight, what is it said to have?

A

Low viscosity

32
Q

1° increment on the °C scale is equal to what °F increment?

A

1.8°F

33
Q

What is the triple point?

A

The temperature which water will exist as a solid, liquid and gas all at the same time

34
Q

What is the Dew point?

A

The temperature at which condensation actually occurs.

Module 2 - Phyics B1 (6 decks)

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