Mechanics Exam Questions and Answers 100% Pass

Document Content and Description Below

Mechanics Exam Questions and Answers 100% Pass ** 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. ** How many Strain Supports are required on a 350' raceway? ✔✔4 One for every 100' ** How is Stainless steel drilled out? ✔✔Slow speed and constant pressure (205) ** What are the required amount of clips for Wedge Shackles and what is their spacing? ✔✔At least 2, with the first being 4 times the diameter of the rope from the top of shackle. Second is 8 times the diameter of the rope from the first. ** Car is loaded with 125% and sinks. Why? ✔✔Slipped through the brake. ** A 300 Ohm resistor burns out. You don't have a 300 Ohm resistor to replace it. What can you use to make up the resistor? ✔✔2 600 Ohms resistors in Parallel. "The resistance is half of the highest rating in a parallel circuit. 3, 225 Ohm resistors in parallel equal 75 Ohms. ** A 480 VAC Step Down Transformer is connected to a 3 phase rectifier. What will the output

[Show More]

Last updated: 3 years ago

Preview 1 out of 25 pages

Buy Now

Instant download