OAR MECHANICAL
COMPREHENSION TEST BANK 2026
COMPREHENSIVE QUESTIONS AND
ACCURATE SOLUTIONS VERIFIED
◉ What is the formula for calculating the load or the effort of a lever?
Answer: W1 x L1 = W2 x L2 (Weight of the load x distance of the load
from the fulcrum = weight of the effort x distance from the fulcrum to
the effort.)
◉ What is a first class lever? Answer: A lever where the fulcrum is
located between the force and the load. ie. seesaw
◉ What is a second class lever? Answer: A lever where the load
(weight) is located between the force (or effort) and fulcrum. ie.
wheelbarrow, bottle opener, nutcracker. Best suited for carrying heavy
loads.
◉ What is a third class lever? Answer: A lever where the force is
located between the load and the fulcrum. ie. chopsticks, tweezers. Used
for accuracy rather than weight.
◉ What is a gear? Answer: A wheel with equally sized and spaced teeth
located on the circumference.
, ◉ What is the first rule of thumb in meshed gears? Answer: Adjacent
gears rotate in opposite directions.
◉ If a gear system has an even number of cogwheels then...? Answer:
The last cogwheel will turn in the direction opposite the first wheel.
◉ If a gear system has an odd number of cogwheels then...? Answer:
The last cogwheel will turn in the same direction as the first wheel.
◉ What is the second rule of thumb in meshed gears? Answer: The
velocity of the meshed cogwheels is proportional to the number of teeth.
ie. larger the wheel, the slower it turns.
◉ What is the equation for calculating the velocity of meshed
cogwheels? Answer: N1 x V1 = N2 x V2 (Number of teeth in wheel one
x velocity of wheel one = Number of teeth in wheel two x velocity of
wheel two)
◉ Velocity of meshed gears can also be calculated using what? Answer:
Gear Ratio. Gear ration = n1 over/ n2 = v1 over/ v2
◉ What are the three types of pulley systems? Answer: Fixed,
moveable, and combined.
◉ What is the friction between components in a pulley system? Answer:
Zero.
COMPREHENSION TEST BANK 2026
COMPREHENSIVE QUESTIONS AND
ACCURATE SOLUTIONS VERIFIED
◉ What is the formula for calculating the load or the effort of a lever?
Answer: W1 x L1 = W2 x L2 (Weight of the load x distance of the load
from the fulcrum = weight of the effort x distance from the fulcrum to
the effort.)
◉ What is a first class lever? Answer: A lever where the fulcrum is
located between the force and the load. ie. seesaw
◉ What is a second class lever? Answer: A lever where the load
(weight) is located between the force (or effort) and fulcrum. ie.
wheelbarrow, bottle opener, nutcracker. Best suited for carrying heavy
loads.
◉ What is a third class lever? Answer: A lever where the force is
located between the load and the fulcrum. ie. chopsticks, tweezers. Used
for accuracy rather than weight.
◉ What is a gear? Answer: A wheel with equally sized and spaced teeth
located on the circumference.
, ◉ What is the first rule of thumb in meshed gears? Answer: Adjacent
gears rotate in opposite directions.
◉ If a gear system has an even number of cogwheels then...? Answer:
The last cogwheel will turn in the direction opposite the first wheel.
◉ If a gear system has an odd number of cogwheels then...? Answer:
The last cogwheel will turn in the same direction as the first wheel.
◉ What is the second rule of thumb in meshed gears? Answer: The
velocity of the meshed cogwheels is proportional to the number of teeth.
ie. larger the wheel, the slower it turns.
◉ What is the equation for calculating the velocity of meshed
cogwheels? Answer: N1 x V1 = N2 x V2 (Number of teeth in wheel one
x velocity of wheel one = Number of teeth in wheel two x velocity of
wheel two)
◉ Velocity of meshed gears can also be calculated using what? Answer:
Gear Ratio. Gear ration = n1 over/ n2 = v1 over/ v2
◉ What are the three types of pulley systems? Answer: Fixed,
moveable, and combined.
◉ What is the friction between components in a pulley system? Answer:
Zero.
