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 trying to slip through ...

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 trying 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.

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