PRINCIPLES OF ENGINEERING FINAL EXAM WITH
ANSWERS #10
What is a Simple Machine? - correct answer A mechanism that manipulates magnitude
of force and distance
What is Mechanical Advantage? - correct answer The ratio of the magnitude of the
resistance and effort forces
What is work? - correct answer the force applied on an object times the distance it
traveled
What is Ideal Mechanical Advantage? - correct answer Ratio of distance traveled by
effort and resistance force
What is Actual Mechanical Advantage? - correct answer Ratio of force magnitudes;
accounts for friction
What is the equation for IMA? - correct answer IMA=De/Dr
What is the equation for AMA? - correct answer AMA=Fr/Fe
What are the 6 Simple Machines? - correct answer Lever, Wheel and Axle, Pulley,
Inclined Plane, Wedge, Screw
What is a first class lever? - correct answer Fulcrum is in between forces
What is a second class lever? - correct answer The fulcrum is at the end, and the
resistance force is in between the effort force and the fulcrum
What is a third class lever? - correct answer The fulcrum is at the end, and the effort
force is in between the resistance force and the fulcrum
What is the equation for static equilibrium? - correct answer fede=frdr
What is efficiency? - correct answer The ratio of useful energy output to all energy
output
What is the formula for efficiency? - correct answer ETA = AMA/IMA
When is a machine 100% Efficient? - correct answer NEVER
What is a wheel and axle? - correct answer Lever Arm is fixed to a shaft
,What is a lever? - correct answer A lever consisting of a wheel with a groove in its rim
that changes direction and magnitude of a force
What is the IMA of a fixed pulley? - correct answer 1
What is the IMA of a movable pulley? - correct answer
What is the IMA of a bait and tackle pulley? - correct answer
What is an inclined plane? - correct answer A flat, static surface set at an angle
What is a wedge? - correct answer An inclined plane that tapers to a thin edge
What is a screw? - correct answer An inclined plane wrapped around a cylinder that
changes rotary motion into linear motion
What is the pitch of a screw? - correct answer The distance between each thread
What is the threads per inch and diameter of a 1/2 13 NC Screw? - correct answer
Diameter= 1/2"
Threads Per Inch= 13
What do gear chains, sprocket chains, and pulley drives all have in common? - correct
answer They are all mechanisms that transfer energy through rotary motion
What does it mean if two gears are meshed? - correct answer Their teeth are
interlocking
What is an idler gear? - correct answer A gear that allows the driver gear and the driven
gear to turn in the same direction
What is the equation for gear ratio? - correct answer GR = n out/ n in = d out/ d in =
speed in/ speed out = torque out/ torque in
How do you calculate the gear ratio of a compound gear train? - correct answer Multiply
the GR of the first two gears by the GR of the second gear on the same axle and the
last gear
How do you calculate the mechanical advantage of a compound machine? - correct
answer Multiply MA's of each component
What is energy? - correct answer The ability to do work
What is nonrenewable energy? - correct answer energy that cannot be replaced in a
reasonable time
, What is renewable energy? - correct answer Energy that can be replaced once used
What is inexhaustible energy? - correct answer Energy that will never run out
What is a breadboard? - correct answer A reusable platform for temporarily built
electronic circuits
What is a diode? - correct answer A component that allows the flow of electricity in only
one direction
What is an LED? - correct answer Light Emitting Diode
What is a resistor? - correct answer A component that resists the flow of electrical
current
What is electricity? - correct answer The movement of electrons
What is a conductor? - correct answer A material that allows electrical current to flow
easily.
What is an insulator? - correct answer A material that strongly resists the flow of energy.
What is an electrical circuit? - correct answer A system of conductors and components
forming a complete path for current to travel
What is current? What is its unit? - correct answer The flow of electric charge
Amperes (amps) (A)
What is voltage? What is its unit? - correct answer The force that causes a current to
flow
Volts (V)
What is resistance? What is its unit? - correct answer The opposition to current flow
Ohms (
What is Ohm's Law? - correct answer V=IR
What is a series circuit? - correct answer A circuit that provides only one path for current
flow
What is a parallel circuit? - correct answer A circuit that provides more than one path for
current flow
What is Kirchoff's Voltage Law? - correct answer In a series circuit, the sum of all
voltage drops is equal to total voltage
ANSWERS #10
What is a Simple Machine? - correct answer A mechanism that manipulates magnitude
of force and distance
What is Mechanical Advantage? - correct answer The ratio of the magnitude of the
resistance and effort forces
What is work? - correct answer the force applied on an object times the distance it
traveled
What is Ideal Mechanical Advantage? - correct answer Ratio of distance traveled by
effort and resistance force
What is Actual Mechanical Advantage? - correct answer Ratio of force magnitudes;
accounts for friction
What is the equation for IMA? - correct answer IMA=De/Dr
What is the equation for AMA? - correct answer AMA=Fr/Fe
What are the 6 Simple Machines? - correct answer Lever, Wheel and Axle, Pulley,
Inclined Plane, Wedge, Screw
What is a first class lever? - correct answer Fulcrum is in between forces
What is a second class lever? - correct answer The fulcrum is at the end, and the
resistance force is in between the effort force and the fulcrum
What is a third class lever? - correct answer The fulcrum is at the end, and the effort
force is in between the resistance force and the fulcrum
What is the equation for static equilibrium? - correct answer fede=frdr
What is efficiency? - correct answer The ratio of useful energy output to all energy
output
What is the formula for efficiency? - correct answer ETA = AMA/IMA
When is a machine 100% Efficient? - correct answer NEVER
What is a wheel and axle? - correct answer Lever Arm is fixed to a shaft
,What is a lever? - correct answer A lever consisting of a wheel with a groove in its rim
that changes direction and magnitude of a force
What is the IMA of a fixed pulley? - correct answer 1
What is the IMA of a movable pulley? - correct answer
What is the IMA of a bait and tackle pulley? - correct answer
What is an inclined plane? - correct answer A flat, static surface set at an angle
What is a wedge? - correct answer An inclined plane that tapers to a thin edge
What is a screw? - correct answer An inclined plane wrapped around a cylinder that
changes rotary motion into linear motion
What is the pitch of a screw? - correct answer The distance between each thread
What is the threads per inch and diameter of a 1/2 13 NC Screw? - correct answer
Diameter= 1/2"
Threads Per Inch= 13
What do gear chains, sprocket chains, and pulley drives all have in common? - correct
answer They are all mechanisms that transfer energy through rotary motion
What does it mean if two gears are meshed? - correct answer Their teeth are
interlocking
What is an idler gear? - correct answer A gear that allows the driver gear and the driven
gear to turn in the same direction
What is the equation for gear ratio? - correct answer GR = n out/ n in = d out/ d in =
speed in/ speed out = torque out/ torque in
How do you calculate the gear ratio of a compound gear train? - correct answer Multiply
the GR of the first two gears by the GR of the second gear on the same axle and the
last gear
How do you calculate the mechanical advantage of a compound machine? - correct
answer Multiply MA's of each component
What is energy? - correct answer The ability to do work
What is nonrenewable energy? - correct answer energy that cannot be replaced in a
reasonable time
, What is renewable energy? - correct answer Energy that can be replaced once used
What is inexhaustible energy? - correct answer Energy that will never run out
What is a breadboard? - correct answer A reusable platform for temporarily built
electronic circuits
What is a diode? - correct answer A component that allows the flow of electricity in only
one direction
What is an LED? - correct answer Light Emitting Diode
What is a resistor? - correct answer A component that resists the flow of electrical
current
What is electricity? - correct answer The movement of electrons
What is a conductor? - correct answer A material that allows electrical current to flow
easily.
What is an insulator? - correct answer A material that strongly resists the flow of energy.
What is an electrical circuit? - correct answer A system of conductors and components
forming a complete path for current to travel
What is current? What is its unit? - correct answer The flow of electric charge
Amperes (amps) (A)
What is voltage? What is its unit? - correct answer The force that causes a current to
flow
Volts (V)
What is resistance? What is its unit? - correct answer The opposition to current flow
Ohms (
What is Ohm's Law? - correct answer V=IR
What is a series circuit? - correct answer A circuit that provides only one path for current
flow
What is a parallel circuit? - correct answer A circuit that provides more than one path for
current flow
What is Kirchoff's Voltage Law? - correct answer In a series circuit, the sum of all
voltage drops is equal to total voltage
