Principles of Engineering Final Exam Revision
Questions Verified by Expert
What is a Simple Machine? - Answer A mechanism that manipulates magnitude of force and distance
What is Mechanical Advantage? - Answer The ratio of the magnitude of the resistance and effort forces
What is work? - Answer the force applied on an object times the distance it traveled
What is Ideal Mechanical Advantage? - Answer Ratio of distance traveled by effort and resistance force
What is Actual Mechanical Advantage? - Answer Ratio of force magnitudes; accounts for friction
What is the equation for IMA? - Answer IMA=De/Dr
What is the equation for AMA? - Answer AMA=Fr/Fe
What are the 6 Simple Machines? - Answer Lever, Wheel and Axle, Pulley, Inclined Plane, Wedge, Screw
What is a first class lever? - Answer Fulcrum is in between forces
What is a second class lever? - 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? - 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? - Answer FeDe=FrDr
,What is efficiency? - Answer The ratio of useful energy output to all energy output
What is the formula for efficiency? - Answer ETA = AMA/IMA
When is a machine 100% Efficient? - Answer NEVER
What is a wheel and axle? - Answer Lever Arm is fixed to a shaft
What is a lever? - 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? - Answer 1
What is the IMA of a movable pulley? - Answer
What is the IMA of a bait and tackle pulley? - Answer
What is an inclined plane? - Answer A flat, static surface set at an angle
What is a wedge? - Answer An inclined plane that tapers to a thin edge
What is a screw? - Answer An inclined plane wrapped around a cylinder that changes rotary motion into
linear motion
What is the pitch of a screw? - Answer The distance between each thread
What is the threads per inch and diameter of a 1/2 13 NC Screw? - Answer Diameter= 1/2"
Threads Per Inch= 13
, What do gear chains, sprocket chains, and pulley drives all have in common? - Answer They are all
mechanisms that transfer energy through rotary motion
What does it mean if two gears are meshed? - Answer Their teeth are interlocking
What is an idler gear? - 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? - 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? - 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? - Answer Multiply MA's of
each component
What is energy? - Answer The ability to do work
What is nonrenewable energy? - Answer energy that cannot be replaced in a reasonable time
What is renewable energy? - Answer Energy that can be replaced once used
What is inexhaustible energy? - Answer Energy that will never run out
What is a breadboard? - Answer A reusable platform for temporarily built electronic circuits
What is a diode? - Answer A component that allows the flow of electricity in only one direction
What is an LED? - Answer Light Emitting Diode
Questions Verified by Expert
What is a Simple Machine? - Answer A mechanism that manipulates magnitude of force and distance
What is Mechanical Advantage? - Answer The ratio of the magnitude of the resistance and effort forces
What is work? - Answer the force applied on an object times the distance it traveled
What is Ideal Mechanical Advantage? - Answer Ratio of distance traveled by effort and resistance force
What is Actual Mechanical Advantage? - Answer Ratio of force magnitudes; accounts for friction
What is the equation for IMA? - Answer IMA=De/Dr
What is the equation for AMA? - Answer AMA=Fr/Fe
What are the 6 Simple Machines? - Answer Lever, Wheel and Axle, Pulley, Inclined Plane, Wedge, Screw
What is a first class lever? - Answer Fulcrum is in between forces
What is a second class lever? - 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? - 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? - Answer FeDe=FrDr
,What is efficiency? - Answer The ratio of useful energy output to all energy output
What is the formula for efficiency? - Answer ETA = AMA/IMA
When is a machine 100% Efficient? - Answer NEVER
What is a wheel and axle? - Answer Lever Arm is fixed to a shaft
What is a lever? - 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? - Answer 1
What is the IMA of a movable pulley? - Answer
What is the IMA of a bait and tackle pulley? - Answer
What is an inclined plane? - Answer A flat, static surface set at an angle
What is a wedge? - Answer An inclined plane that tapers to a thin edge
What is a screw? - Answer An inclined plane wrapped around a cylinder that changes rotary motion into
linear motion
What is the pitch of a screw? - Answer The distance between each thread
What is the threads per inch and diameter of a 1/2 13 NC Screw? - Answer Diameter= 1/2"
Threads Per Inch= 13
, What do gear chains, sprocket chains, and pulley drives all have in common? - Answer They are all
mechanisms that transfer energy through rotary motion
What does it mean if two gears are meshed? - Answer Their teeth are interlocking
What is an idler gear? - 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? - 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? - 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? - Answer Multiply MA's of
each component
What is energy? - Answer The ability to do work
What is nonrenewable energy? - Answer energy that cannot be replaced in a reasonable time
What is renewable energy? - Answer Energy that can be replaced once used
What is inexhaustible energy? - Answer Energy that will never run out
What is a breadboard? - Answer A reusable platform for temporarily built electronic circuits
What is a diode? - Answer A component that allows the flow of electricity in only one direction
What is an LED? - Answer Light Emitting Diode
