Three phase motors - Study guides, Class notes & Summaries

Three-phase power ______ than single-phase power -ANSWER - is more efficient Proper overcurrent protection for a three-phase motor requires -ANSWER - a triple-pole breaker Three-phase induction motors can be damaged by ____ in a three-phase power distribution system. -ANSWER - loss of voltage In the SO-Hertz world, the Three-Phase _(___) configuration is by far the most frequently used. -ANSWER - wye Three-Phase is a more efficient use of conductors. Given the same peak voltage betwe...

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

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...

A metallic shore power inlet becomes hot to the touch. Which would not be a contributing factor? - correct answer Temperature rating of shore-cord insulation An inter-circuit short can cause: - correct answer " All of the above; Unrelated circuits to operate simultaneously; Components to work at reduced capacity; An over-current situation" Which of the following is addressed by ABYC A-32? - correct answ...

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Texas Irrigation license Exam 2 Practice Test 2024 T F Surge irrigation is used along with center pivot swing arms to provide more uniform irrigation? - CORRECT ANSWER-False T F Worn or cracked gaskets can be replaced to reduce leaks between sections of aluminum sprinkler pipe by the farmer? - CORRECT ANSWER-True T F Gaskets between 3 inch hand line sprinklers are made of only one material, rubberized leather. - CORRECT ANSWER-False T F The lateral carries water from the pump to the ...

Reactive power is always __ - Answer-90 degrees out of phase with true power Before awarding a journeyman certificate, a typical electrical apprenticeship program requires 8,000 total hours of __ - Answer-on-the-job training The formula for inductive reactance is __ - Answer-XL=2(pi)fL According to the power triangle, the apparent power is __ - Answer-greater than the true power If the time for one cycle is 0.1 second, the frequency is __ - Answer-10Hz The minimum ampacity for a feeder sup...

NCCER Examination Prep Set Questions Revised With Correct Answers < Updated & Already Passed > A UL listed rod type grounding electrode must have a MINIMUM length of? - ANSWER : 8' What is the MINIMUM number of overload sensing units required for all three phase motors? - ANSWER : 3 In a circuit of pure capacitance, the current leads the voltage by an angle of? - ANSWER : 90 degrees The standard unit for measuring the cross sectional area of wire is the? - ANSWER ...

Electrical NCCER test Questions And Answers All Correct In a guardrail system, the guardrails can be made of any of the following EXCEPT: - ANS rope banding If the potential across the circuit is 48 volts and the current is 5 amps the resistance of the circuit is: - ANS 9.6 ohms A UL listed rod type grounding electrode must have a minimum length of: - ANS 8' What is the MINIMUM number of overload sensing units required for all three phase motors? - ANS 3 In a circuit of pu...

EVITP: Load calculation Feeders and services Level 4 Module Exam Set Questions And Correct Revised Answers | Updated!! When calculating the service requirement for a particular building, the step is to - ANSWER 35 determine the floor area of the building What is the feeder ampacity for a three-phase, 120/208V subpanel with a connected load of 84,563VA? - ANSWER 235A Which part of a residential lighting and small appliance load must be rated at 35% for servives...