Commutator Study guides, Class notes & Summaries

A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What sheave is required? - CORRECT ANS Diam=12" 12/4=3" 25fpm=3" 100fpm + 25fpm= 12"+3"= 15" sheave A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read voltage or resistance. What should you do? - CORRECT ANS Replace it with a larger MOV On a Ward-Leonard circuit the break is set, but the motor is trying to slip through the break. What is the issue? - CORRECT ANS Suicide Circ...

How DC motors operate? Magnetic lines of force are continuous and always form closed loops; Magnetic lines of force do not cross. Armature: (Definition) The rotating windings of a DC motor. The ____ is a movable electromagnet located between the poles of another fixed permanent (field) magnet as shown. Armature A twisting force called ______ must be developed. _____ is produced by mounting a loop in a fixed magnetic field and as long as the fields of the magnet and armatu...

What material should be used for seating brushes? correct answers Sandpaper Readings on the meter appear to be inaccurate, what should you do? correct answers Test meter A machine that converts mechanical energy into electrical energy correct answers Generator What is the purpose of interpoles in a motor? correct answers Helps prevent neutral planes from shifting In the basic loop circuit generator armature supplies DC power to what DC elevator hoist motor component? correct answers ...

1. A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What sheave is required?: Diam=12" 12/4=3" 25fpm=3" 100fpm + 25fpm= 12"+3"= 15" sheave 2. A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read voltage or resistance. What should you do?: Replace it with a larger MOV 3. On a Ward-Leonard circuit the break is set, but the motor is trying to slip through the break. What is the issue?: Suicide Circuit 4. You have an old DC ...

NEIEP 400 Final Exam Review (2023 – 2024) With Complete Solution Sandpaper - CORRECT ANSWER-What material should be used for seating brushes? Test meter - CORRECT ANSWER-Readings on the meter appear to be inaccurate, what should you do? Generator - CORRECT ANSWER-A machine that converts mechanical energy into electrical energy Help prevent neutral plains from shifting - CORRECT ANSWER-What is the purpose of interpoles in a motor? Motor armature - CORRECT ANSWER-In the basic lo...

NEIEP 400 Final Review (all Answered Correctly) What material should be used for seating brushes? Correct Answer Sandpaper Readings on the meter appear to be inaccurate, what should you do? Correct Answer Test meter A machine that converts mechanical energy into electrical energy Correct Answer Generator What is the purpose of interpoles in a motor? Correct Answer Help prevent neutral plains from shifting In the basic loop circuit generator armature supplies DC power to what DC e...

A contractor wants to raise the car speed from 100fpm to 125fpm, it currently has a 12" sheave. What sheave is required? - Answer- Diam=12" 12/4=3" 25fpm=3" 100fpm + 25fpm= 12"+3"= 15" sheave A MOV (Metal Oxide Varistor) burns out. You replace it, but cannot read voltage or resistance. What should you do? - Answer- Replace it with a larger MOV On a Ward-Leonard circuit the break is set, but the motor is trying to slip through the break. What is the issue? - Answer- Suicide Circuit ...

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 CW...

This is the third assignment required for unit 15 Electrical Circuits BTEC applied science. This assignment was awarded a distinction grade and it covers all the key aspects of the specification. Please do not copy use as a guide only, good luck!

1. The field coils of a series motor are connected in series with the . - : armature 2. A(n) is used to provide the switching action required for continuous DC motor rotation.: Commutator 3. The most common class of insulation used in motor manufacturing and rewinding is NEMA .: Class B 4. Which type of motor requires brushes, slip rings, and an amortisseur wind- ing?: Synchronous motor 5. The two basic types of DC motor connections are the and : - Series; Shunt 6. Define slip.: the diffe...

NEIEP 400 Final Exam V2 (New 2023/ 2024 Update) Questions and Verified Answers| 100% Correct| Graded A QUESTION which statement applies when a secondary winding is partially shorted?- Answer: current through the secondary is low. QUESTION the direction of the magnetic field around a wire when electron current flows through it can be determined by ? Answer: The left hand rule. QUESTION What are naturally magnetic mat...