Postal Maintenance 5 Exam Rated A+ 2025 New Update

Postal Maintenance 5 Exam Rated A+ 2025 New Update A 20 turn primary winding has an input current of 1A; the secondary winding is 100 turns, what is the secondary current? - Answer- 2A or 200mA Which initials refer to a definite thread specification? - Answer- NPR (National Pipe Thread) 40 grit sandpaper has: - Answer- 40 particles per inch A device which uses a solenoid and has contacts is called what? - Answer- Relay What device converts electrical energy to mechanical energy? - Answer- Motor What device converts mechanical energy to electrical energy? - Answer- Generator What tool is used to measure shaft size? - Answer- Caliper What are the parts to a motor? - Answer- Armature A component that joins 2 shafts is called a? - Answer- Coupling What types of gears are at right angles to each other? - Answer- Worm and wheel, and Rack and pinion For what are countersinks on electric drills? - Answer- Seat flathead screws flush to surface What is the unit for capacitance? - Answer- Farad What happens if the leads of electrical component are dirty? - Answer- They heat up and have less conductivity What is Ohm's Law? - Answer- V=IR, P=I2R, P=V2R Current in a series circuit at any given point is? - Answer- The same How many paths must current travel in a series circuit? - Answer- 1 How much resistance is in a short circuit? - Answer- Ohm's What does current do in a parallel circuit? - Answer- Divides between the different paths of the circit Which is cheaper and easier to transmit? - Answer- AC For current to flow there must always be a potential difference in voltage - Answer- True Who may remove a lockout? - Answer- The person who put it there? Who is responsible for safety? - Answer- Each individual Each chemical has a sheet which tells the makeup and hazards associated with the chemical called an: - Answer- MSDS What is the safest method for working on live equipment? - Answer- Keep one hand behind you while working, but only if it has to be live Who gets a key to your lockout? - Answer- Just you Whose fault is an accident? - Answer- Yours A 3 phase motor has been replaced with an exact replacement, and when the motor is started it runs backwards. Why? - Answer- The mechanic didn't know what he was doing and 2 of the hot legs have been swapped In a grease or oil fire, which class extinguisher would be used? - Answer- Class B A fuse is considered a safety device - Answer- True What does the number in 10 in SAE 10W refer to? - Answer- Viscocity What is the MOST important difference between grease and oil? - Answer- Consistency Which procedure should be followed to avoid lubricant contamination in a pillow block bearing? - Answer- Wipe the fitting clean lubricating For which components should SAE 10W oil be used? - Answer- Roller chains