FREE NYS Civil Service PCO Test Questions and Answers
Have sloping faces and toothed wheels that mesh at a specific angle.
Explanation:
Yes, that is correct! Bevel gears are a type of gear that have toothed wheels with sloping faces that mesh at a specific angle. Bevel gears are used to transmit power between shafts that are not parallel to each other.
A straightforward device that uses a stiff bar that pivots on a supporting piece to lift or pry up a weight at one end by applying force at the other
Explanation:
Yes, the simple machine you are referring to is a lever.
It has two lever arms attached at a pivot, similar to scissors or pliers.
When using a compressed air sprayer to treat cracks and crevices, the recommended internal pressure is
Explanation:
The proper internal pressure for a compressed air sprayer making a crack and crevice treatment can vary depending on the specific sprayer and the type of application being made. However, a common range of internal pressure for this type of treatment is between 5 to 20 psi (pounds per square inch).
Alters the direction of the load's effort. Instead of pulling downward, you do so upward. It has a single wheel and a rope. The weight of the load determines how much force is necessary to lift it.
Explanation:
Correct Answer: Simple Pulley
A fixed pulley only changes the direction of the applied force and does not multiply it. It simply redirects the force required to lift an object downwards, making it easier to lift the object in some cases.
A wheel with teeth along its edge that engage with other gear wheels or other teeth to provide movement
Explanation:
A gear is a wheel with teeth around its edge that interlocks with the teeth of another gear wheel to create movement. Gears are used to transmit torque and rotation between two or more shafts, and they can be used to increase or decrease the speed, force, or direction of motion in a machine.
Machines with few moving parts
Explanation:
Yes, machines that have few moving parts are typically referred to as "simple machines."