Meen 315 Exam 1
a
A closed thermodynamic system cannot: a)Transfer mass with its surroundings b)Transfer energy with its surroundings c)Transfer mass or energy with its surroundings d)experience a change in mas and/or energy
Closed system
A fixed quantity of matter
Property
A macroscopic characteristic of a system to which a numerical value can be assigned at a given time without knowledge of the previous behavior of the system
Polytropic process
Any process that follows the relationship: pV^n
Volume
Choose the extensive property: Volume, temperature, density, pressure
b
Convection heat transfer involves: a)Conduction and radiation b)Conduction and fluid motion c)Radiation and fluid motion d)Work and conduction
Surroundings
Everything external to the system
Zeroth law
If two objects are in equilibrium with a third object, the both objects must be in equilibrium with each other.
Boundary
It differentiates the system from the surroundings
Process
It is a transformation from one state to another state
Intensive properties
Properties are independent of the size of the system and may vary from plate to place within the system
Extensive properties
Properties that are dependent on the size of the system and its overall system is the sum of its values for the parts of the system
Work
Quantity of energy transferred from one system to another (Thermodynamic definition of...)
Power
Rate of doing work
Total Energy
Sum of all the different forms of energy for a system.
Absolute Pressure
Sum of atmospheric pressure and gage pressure
Adiabatic
System that has no thermal energy transfer with the surroundings.
State
The condition of a system as described by its properties .
d
The list consisting only of intensive properties is: a)Volume,temperature,pressure b)Specific volume,mass, volume c)Mass,temperature,pressure d)Pressure,temperature,specific volume
Critical point
The point that connects the saturated liquid line to the saturated vapor line is called the:
b
The thermal efficiency of a power cycle is: a)Always greater than 1 b)is calculated as the work out over the heat in c)is the reciprocal of the COP of a power cycle. d)Has the standard units of J in SI unit system
b
The work associated with a piston/cylinder arrangement is: a)Shaft work b)Boundary work c)Electrical work d)Due to temperature difference
Thermodynamic Equilibrium
There are no net macroscopic flows of matter or of energy, either within a system or between systems.
Buoyant Force
Upward force exerted by any fluid upon a body placed in it
System
Whatever we want to study
Thermal Interaction
When energy in form of heat is exchanged between thermodynamic systems
Pa, lb
Which of the following are not primary dimensions? Kg, Pa, s, lb
Work
Which of the following is not an extensive property? mass, work, volume, kinetic energy
Internal energy
Which thermodynamic property is the best measure of the molecular activity of a substance?
Thermal efficiency
Work out over heat in.
Thermal energy
energy that comes from heat.
Pressure
is defined as force per unit area.
Thermometric property
physical property that changes measurably with temperature
Control volume
region of space through which mass may flow
