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WorksheetsPrinciples of Technology 2 - Unit 7 Summary Test
Total questions: 20
Worksheet time: 20mins
Which of the following is a first-class lever?
teeter-totter
wheelbarrow
human arm
nutcracker
Transformers are ____ 100% efficient.
usually
never
always
For second-class levers, the effort and load are on the [same, opposite] side. (choose the correct word.)
same side
opposite side
doesn’t make any difference
Which is true of a mechanical system that is not ideal?
The work out is always more than the work in.
The work in is always more than the work out.
The work in is equal to the work out.
Linear mechanical force transformers involve a force and displacement at ____.
the input end
the output end
both ends
neither end
A force transformer amplifies force, thus it develops a ____.
mechanical advantage
mechanical disadvantage
neither
both
In a first-class lever the input force and the output force are always ____.
on opposite sides of the pivot
the same side of a pivot
can be either a or b
none of these
In a third-class lever the effort and the load are ____.
on opposite sides of a pivot
on the same side of a pivot
does not apply
can be either a or b
Which of the following is not a linear force transformer?
an inclined plane
a drive belt
a block and tackle rig
a lever
An ideal transformer is one that is ____ efficient.
25%
50%
75%
100%
The difference between ideal mechanical advantage and actual mechanical advantage is ____.
the amount of effort expended
the amount of resistance and friction present
the number of pulleys used
Which of the following is true about ideal mechanical advantage?
IMA equals the ratio Di/Do
IMA equals the ratio Fo/Fi
IMA does not take into account the action of resistance
all of these are true
The basic work equation for an ideal transformer in a linear mechanical system is ____.
Fi ×Di = Fo × Do is the formula for what?
Ideal force transformer
Work input = Work output
Input force Input displacement = Output force on load Output load displacement
all of these
Which system shown would allow one to lift a 200 lb load with least effort?
a only
b only
c only
a & b
B & c
A block and tackle lifts 100 lbs 6 inches while the rope requires 20 lbs of force and is moved 3 ft. What is the efficiency of the system.
5%
500%
42%
2.4%
Which of the following are characteristics of pressure intensifiers?
no substantial heat problem is present
they eliminate the need for electrical equipment
they are compact allowing one pump to deliver several pressures
expensive high-pressure controls are not needed in the supply side of a system
all of the above
In a hydraulic jack which of the following are true?
the input pressure equals output pressure
the input force is greater than the output force
the input distance is less than the output force
the input volume is less than the output volume
In a pressure “booster” or intensifier, the force remains the same, but the pressure and ____ changes.
volume
Newtons
lbs
height
What kind of fluid force transformers is more efficient?
pneumatic
hydraulic
pneumatic and hydraulic have the same efficiency
