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FCTC WRITTEN EXAM ACTUAL EXAM 100 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES
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FCTC WRITTEN EXAM ACTUAL EXAM 100 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES
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FCTC WRITTEN EXAM ACTUAL EXAM 100 QUESTIONS ANDCORRECT DETAILED ANSWERS WITH RATIONALES
What is usually the drive element of a pulley? - rope, cable, belt or chain that runs over
the pulley inside the groove
Pulleys are assembled to form what - a block and tackle in order to provide mechanical
advantage to apply large forces
rope and pulley systems (block and tackle) are characterized by what? - the use of a
single continuous rope to transmit a tension force around one or more pulleys to lift or
move a load
the rope may be a light line or a strong cable
What is the mechanical advantage of a rope and pulley system if it does not dissipate or
store energy? - the number of parts of the rope that act on the load
What is a lever? - a machine consisting of a beam or rigid rod pivoted at a fixed hinge or
fulcrum
How do levers work? - amplifies an input force to provide a greater output force, which
is said to provide leverage
what is the mechanical advantage of a lever? - the ratio or the output force to the input
force
How are levers classified? - by relative positions of the fulcrum and the input and output
forces.
allows identification by the relative locations of the fulcrum, the resistance, and the
effort.
A belt and pulley system is characterized by - two or more pulleys in common to a belt.
What does a belt and pulley system allow for? - mechanical power, torque, and speed
to be transmitted across axles
How is mechanical advantage realized? - if the pulleys are different diameters
what is a pulley? - a wheel on an axle or shaft that is designed to support movement
and change of direction of a cable or belt along its circumference
, Why are pulleys used? - lift loads
apply forces
trasmit power
Class 1 Lever - Fulcrum in the middle
the effort is applied on one side of the fulcrum and the resistance on the other side.
Examples of Class 1 levers: - see saw, crowbar, scissors
What is the mechanical advantage of a Class 1 lever? - It may be greater than or less
than 1
Class 2 Lever - Resistance in the middle.
Effort is applied on one side of the resistance and the fulcrum is located on the other
side.
Examples of Class 2 levers: - Wheel barrow, a nutcracker, a bottle opener or the brake
pedal of a car
What is the mechanical advantage of a Class 2 lever? - It is always greater than 1
Class 3 Lever - Effort in the middle
The resistance is on one side of the effort and the fulcrum is located on the other side.
Examples of Class 3 levers - tweezers or the human mandible
Mechanical advantage is always less than 1
FRE 123 - Fulcrum in middle for 1st class
Resistance is in the middle for the 2nd lever
Effort is in the middle for the 3rd
HEAD - pressure created by the force of gravity and is a function of the difference in
elevation between intake and output
Head is usually measured in - pounds per square inch
Formula for determining head pressure - 1 vertical foot= 0.433 pounds / square inch
1 PSI = 2.31 vertical feet
Water head pressure is - Static pressure caused by the weight of water solely due to its
height above the measuring point.
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