Commutator Study guides, Class notes & Summaries

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...

After installing a new battery how long should you wait to allow for pcm time no need to wait As blower motor speed decreases the voltage drop across the resistance block.... increases What should you do first when replacing junction block or fuse? Unlock the battery ground cable The polarity of the voltage applied to the electromagnetic coils of an actual working DC motor is.... a commutator When performing a volt drop test the volt meter setting should be set to...

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 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...

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...

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...

ABYC ELECTRICAL Exam Questions And Revised Correct Answers | Complete Set | Already Passed The reverse polarity indicator is an LED with 2 legs. One of these legs have a resistor of - ANSWER : 25k Ohms Anodes used in cathodic protection systems shall be - ANSWER : painted with a protective barrier coating Oil pressure and temperature gauges are - ANSWER : installed in series What type of element are in series - ANSWER : the switches Voltage regulator ( inbetween output and break...

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 Suici...

IEC Year 3 Semester 2 Questions And Answers 100% Guaranteed Success. A shunt DC motor is a type of DC motor. - correct answer. A. True If a motor has field leads that are marked F1 and F2, this is a ___ motor. - correct answer. A. DC motor A 10°C increase in the operating temperature can decrease the life expectancy of a DC motor by as much as ___. - correct answer. C. 1/2 Which of the following are types of 1-ph AC motors? - correct answer. E. all of these ...