Exam (elaborations)
POE EOC Review Questions and Answers 2024
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Exam of 7 pages for the course EOC at EOC (POE EOC Review)
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POE EOC ReviewIMA - answer Ideal Mechanical Advantage = Distance effort moves / distance load
moves
AMA - answer Actual Mechanical Advantage = Load / Effort
Efficiency - answer= AMA / IMA x 100%
Nothing in the real world is more than 100% efficient.
Classification of Levels: - answer• Class 1 fulcrum is in the middle
• Class 2 load is in the middle
• Class 3 effort is in the middle
IMA of a lever - answer Length of effort arm/ length of load arm
IMA of a wheel and axel - answer radius of effort arm/ radius of load arm
IMA of a screw - answer circumference / pitch of screw (inches per thread)
or
πd/P
IMA of a inclined plane - answer Length of sloped side of the ramp/ height of ramp
IMA of a wedge - answer Length of sloped side of the wedge/ width of the wedge
IMA of a pulley - answer Number of strands supporting the load
Compound Machines – answer MA total = MA1 X MA2 X MA3 X...
ω - answer rotational speed (rpm)
τ - answer torque (in lbs or Nm)
Gear Ration (GR) - answer Number of teethout / number of teethin. = No/Ni
No/Ni = Do/Di = τo / τi = ωi / ωo
Sprockets use chains - answernoisier, more expensive, stronger, need lubrication
Driver pulleys use belts - answerquieter, cheaper, weaker, no lubrication
Nonrenewable - answercan be used up
EX: oil, coal, uranium.
, Renewable - answermore can be made
EX: bio fuels, plants, animals
Inexhaustible - answerwe don't do anything to make more
EX: solar, wind, hydro-electric
Work - answerForce x Distance
Power - answerWork/Time
Hydrogen Fuel - answer• Hydrogen fuel cells combine hydrogen and oxygen to
create electricity.
• They create no pollution, only water.
• It is an emerging technology with many issues such as
storage and distribution.
Thermodynamics - answerMatter is made up of molecules in motion (kinetic energy)
Absolute Zero - answeroccurs when all kinetic energy is removed from a object 0 K = -
273° C
1st law of thermodynamics - answerEnergy cannot be created or destroyed.
2nd law of thermodynamics - answerthermal energy moves from hot to cold -
Entropy (measure of disorder of energy) always increases.
3rd law of thermodynamics - answerthe entropy of a system at absolute zero is a well-
defined constant.
Thermal energy can be transferred - answerconvection (moving fluid), conduction
(touching objects)
or radiation (electromagnetic waves through space or air).
Rate of transfer - answerP= A*ΔT/r-value = k*A *ΔT / L
r-value= thermal resistance
T= temperature
A = area
L =length
k = thermal conductivity.
Heat Energy transfer - answerQ= m * Cp*ΔT
Cp= specific heat capacity of a material
m= mass of the object
T= Temperature
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