Engineering Mechanics > EXAM > Mechanics Exam 2022/2023 WITH 100% CORRECT ANSWERS (All)

Mechanics Exam 2022/2023 WITH 100% CORRECT ANSWERS

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An MOV burns out, you replace it but cannot read voltage or resistance. What should you do? Replace it with a larger one (630) * On a Ward-Leonard circuit, the brake is set but the motor is tr ... ying to slip through the brake. What circuit is the issue? Suicide circuit (425) ** A Hydro runs up with no load but does not run up with a full load. What is the issue? The relief valve is set too low (805) ** Runby for a 1:1 car hits the CWT buffer 4" below the top landing. The CWT runby should be set at 18". How much should the ropes be shortened? 22" for 1:1. For a 2:1 with the same issue is 44". ** You need to work on a freight door retiring cam. You LOTO the mainline disconnect but there is still power to the cam. What circuit is still hot? Mainline disconnect (535) ** The contractor requests that the vertical center of the Rack and Pinion hoist be moved. How is this accomplished? Adjust Tie downs/Wall ties (805) ** Working pressure on a Hydro is 400 PSI. What is the correct Relief Valve Setting? 600 PSI Max. (805) 400 psi x 150% = 600 psi ** A contractor wants to raise the car speed from 100 FPM to 125 FPM. It currently has a 12" sheave. What size sheave is required? 15" (125 /100 = 1.25 1.25 x 12 = 15) ** There is slight arcing at the Brushes and Commutator. What actions must be taken? None. (430) "Heavy arcing is due to light brush pressure. Mechanical wear indicates heavy brush pressure. ** How much resistance is normally measured across a normally closed switch ? 1.2 ohms or 1 to 2 ohms ** A car traveling in the hoistway always stops at the same point and blows a fuse. What is the problem? Traveling cable has a cut or short ** How is a Class 1 (yearly) buffer test performed? At slow speed and the buffer must return in 90 seconds. (555) *(60 seconds is acceptable) (90 seconds is code) 5 year test (Class 5) is car at rated load and speed. Buffer must return in 90 seconds. CWT at rated speed and buffer must return in 90 seconds. [Show More]

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