Mechanic Exam Questions and Answers Rated A

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Mechanic Exam Questions and Answers Rated A E=__ ✔✔IR P=__ ✔✔IE Pie r^2 = ✔✔Area of a circle 231 in^3 /____ ✔✔gal. 25.4mm/__ ✔✔in. 2.2kg/ ✔✔lb 3 phase rectifier output ... = ✔✔1.33 x input single phase output = ✔✔0.9 x input RMS (effective voltage) = ✔✔0.707 (PEAK V) TC = ✔✔R x C (5)??? RPM = ✔✔60 (frequency) / (poles/2) door overlap minimum = ✔✔5/8" min door gaps maximum = ✔✔3/8" max Gibs minimum = ✔✔1/4" min Gate Switch maximum = ✔✔2" Passenger Sill to Sill ____ to ______" ✔✔1/2 to 1-1/2" Platform Lift Sill ____ to _____" ✔✔3/8" to 3/4" Moving Walk maximum = ✔✔12 degree max Governors (Car Trip Speed =______ & Overspeed Switch =______) ✔✔Car trip speed 15-20% greater than contract speed. Overspeed Switch less than or equal to 90-95% of trip speed CWT (____%) ✔✔Up to 10% greater than car trip speed 1) A contractor wants to raise the car speed from 100FPM to 125FPM. It currently has a 12" sheave. What size sheave is required? ✔✔15" ----Diam = 12, 12"/4=3, 25FPM=3in : 100FPM + 25FPM = 12"+3" =15" 2) An MOV (metal oxide varistor) burns out. You should replace it, but cannot read the Voltage or resistance. What should you do? ✔✔Replace it with a larger MOV. (630) 3) On a Ward-Leonard circuit, the brake is set, but the motor is trying to slip through the break. What circuit is the issue? ✔✔Suicide Circuit. (425) 4) You have an old DC motor and you are adding an SCR Drive. What do you do with the interpoles? ✔✔Leave the interpoles alone. (425). NOTE: When adding the SCR Drive to the generator, the series loop is removed, as are the 3 resistors. Everything else stays the same. 5) 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). 6) 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" and for a 2:1 with the same issue -- > 44" 7) You need to work on a freight door retiring cam. You L [Show More]

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