Mechanic Review Eligibility Course_Study Guide Questions and Answers 100% A+

Mechanic Review Eligibility Course_Study Guide Questions and Answers 100% A+ What percaution should you take before entering the step/treadway band of an escalator or moving walk? - CORRECT ANSWER-Lock out and tag out the mainline disconnect When pepering to install moving walks, you need to check th wellway-to-wellway. The print calls for a distance of 44044mm. What would the reading be using standard measurments? - CORRECT ANSWER-144' 6" What practices should be followed when initially lifting a load? - CORRECT ANSWER-Initially lift the load a few inches, and then recheck all rigging What is the name of the scientific principle that follows for operation of a hydraulic elevator? - CORRECT ANSWER-Pascal's law Using current from a rectifier, through an anode, then to the cylinder describes what type of corrosion protection system? - CORRECT ANSWER-Impressed Current System What determines the full speed of a hydraulic elevator? - CORRECT ANSWER-Rate of flow in GPM If you run the platen plate hard into the bolsters when making the connection, how can you ease it down! - CORRECT ANSWER-With the manual lowering valve What is the correct position for aligning the combplate teeth with the walkway treads? - CORRECT ANSWER-The teeth must be below the upper surface of the treads As a step moves from the upper track to the upper curve, what is used to protect the step chain rollers from excessive load? - CORRECT ANSWER-Transition board How many cubic inches are there in one gallon? - CORRECT ANSWER-231 On escalator installations, what measurement defines the distance from the lower floor to the upper floor heights? - CORRECT ANSWER-Rise What is the area of a 6"plunger? - CORRECT ANSWER-28.27 square inches How are the three operating buttons in the temporary box marked? - CORRECT ANSWER-UP, DOWN, AND RUN Which are the four basic parts of a jack assembly? - CORRECT ANSWER-Head, packing, cylinder, plunger Why is a check valve required? - CORRECT ANSWER-To prevent oil from flowing from the jack to the reservoir What is the component is connected between the plunger and the bolster assembly - CORRECT ANSWER-The platen plate 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? - CORRECT ANSWER-In pounds per square inch How many gallons of oil will be needed to raise a 4" plunger 25 feet? - CORRECT ANSWER-16.3 gallons How is the duty of a hydraulic elevator rated? - CORRECT ANSWER-Speed and capacity When a hydraulic elevator is at rest at a floor level, which valve is open? - CORRECT ANSWER-Up valve 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? - CORRECT ANSWER-200 psi What is another name for up slowdown? - CORRECT ANSWER-Up transition Which describes the operation of a typical hydraulic block valve with an elevator landed at the floor? - CORRECT ANSWER-The down valve is closed, the check valve is closed, and the up valve is open What is the definition of "working pressure"? - CORRECT ANSWER-Full load up pressure What two functions are combined in a single valve - CORRECT ANSWER-Up start bypass and relief valve In order to preform a plunger stop test which circuits would you have to jump out? - CORRECT ANSWER-The up limits switches 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? - CORRECT ANSWER-Multiply pressure times area If a pump makes a hammering noise, what would be the first thing to check? - CORRECT ANSWER-Check for oil in the reservoir If a hydraulic elevator will not run down, what is the first thing you should check? - CORRECT ANSWER-See if it will run down by opening the manual lowering valve You pull the main line disconnect switch and close the line shutoff; the car slowly drifts downward. You don't observe ant oil leaking anywhere. What does this indicate? - CORRECT ANSWER-An underground leak