Induction motors Study guides, Revision 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...

NATE Gas Heating Exam Verified Questions and answers 2023 Latest Update Since 1992, the United States Department of Energy has required that all furnaces sold and installed from that date on must have an AFUE of no less than: A: 70% B: 75% C: 78% D: 80% - correct answer C: 78% Many pre-1992 furnaces have efficiencies around . A: 10% B: 40% C: 60% D: 80% - correct answer C: 60% Today, furnaces with AFUE ratings greater than are available. A: 85% B: 90% C: 100% D: 110% - correct ...

NCCER Test Questions and Answers 100% Pass A UL listed rod type ground electrode must have minimum length of 8'' in a circuit of pure capacitance, the current leads the voltage by 90 degrees The standard unit for measuring the cross sectional area of wire is the circular mil the drawing scale is most likely to be found in the drawing title block what is the minimum number of overload sensing units required for all three phase motors 3 what is the resultant distance between center bends fo...

PSI National Home Inspector Practice Exam 2023 Questions and Answers with complete solution Which of the following describes partial vapor pressure? A) Water vapor has a tendency to disperse itself equally in the available air. B) Water vapor causes new homes to require house wrap. C) Water vapor is common with forced induction natural gas furnaces. D) Water vapor is an indication of sick house syndrome. A) Water vapor has a tendency to disperse itself equally in the available air. In...

The maximum allowable voltage drop between the generator and the bus bar is A. 1 percent of the regulated voltage. B. 2 percent of the regulated voltage. C. less than the voltage drop permitted between the battery and the bus bar. - correct answer 2 percent of the regulated voltage. The maximum allowable voltage drop between the generator and the bus bar is 2% of the regulated voltage of the generator. What are two types of ac motors that are used to produce a relatively high torque?...

NEIEP 400 Final Exam V1 (New 2023/ 2024 Update) Questions and Verified Answers| 100% Correct| Graded A QUESTION Which statement applies when a secondary winding is completely shorted ? Answer: Current through the primary is high QUESTION Which statement applies when a secondary winding is partially shorted ? Answer: Current through the secondary is low QUESTION Which statement applies when a secondary winding is open ? Answer: The sec- ondary resis...

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...

PSI National Home Inspector Practice Exam 2024 Questions and Answers Already Graded A+. 1. Which of the following describes partial vapor pressure? A) Water vapor has a tendency to disperse itself equally in the available air. B) Water vapor causes new homes to require house wrap. C) Water vapor is common with forced induction natural gas furnaces. D) Water vapor is an indication of sick house syndrome.: correct answer- A) Water vapor has a tendency to disperse itself equally in the availa...

This document contains a summary of Electrodynamics, including: - Cover page - Electromagnetism - Direct-Current Motors - Electromagnetic Induction - Alternating Current Generators and Transformers - Alternating Current - Hand Rule Summaries

Electrical - Motors Test Part 2 The synchronous speed at which a four-pole. 60Hz induction motor operates is _________ rpm. a. 6,900 b. 2,500 c. 1,140 d. 1,800 - 1,800 The most common service factor appearing on a motor's nameplate is: a. 115 b. 1.15 c. 2 d. 1.5 - 1.15 The _______represent(s) the stationary magnet of a DC motor. a. armature b. rotor c. commutator d. field poles - field poles The _______ DC motor is used where the required starting torque is high and spee...