815 STUDY GUIDE 2024.

815 STUDY GUIDE 2024.See if it will run down by opening the manual lowering valve - ANSWER If a hydraulic elevator will not run down, what is the first thing you should try? In pounds per square inch - ANSWER When calculating hydraulic system pressure, the force is expressed in pounds and the area of the plunger is measured in square inches. How is the pressure expressed? Pascal's Law - ANSWER What is the name of the scientific principle that allows a hydraulic elevator to operate? Every year - ANSWER How often must a static load test be performed? Multiply pressure times area - ANSWER If a gauge is used to measure system pressure with the elevator at rest and the size of the plunger is known, how can the total weight of the elevator be calculated? 231 - ANSWER How many cubic inches are there in one gallon? 28.27 square inches - ANSWER What is the area of a 6" plunger? 200 psi - ANSWER A weight (force) of 5,000 lbs. is placed on a hydraulic plunger having an area of 25 square inches. What is the system pressure? 16.3 gallons - ANSWER How many gallons of oil will be needed to raise a 4" plunger 25 feet? Speed and capacity - ANSWER How is the duty of a hydraulic elevator rated? Up valve - ANSWER When a hydraulic elevator is at rest at floor level, what valves are open?