Three phase motors - Study guides, Class notes & Summaries

Z-51 Written Exam Questions and Complete Solutions In a steam turbine, what is the function of a Kingsbury thrust bearing? A) Maintain first stage steam pressure. B) Compensate for coupling misalignment. C) Adjust shaft torque at start up. D) Maintain axial positioning of the rotor shaft. - Answer: D) Maintain axial positioning of the rotor shaft. The ratio of actual pressure of water pressure in the atmosphere to the saturated pressure of given temperature is A) partial pressure....

Compared to traditional US power sources, _____ delivers three times the power with only 1.5 times the conductor material. - ANSWER-three-phase power In a delta configuration, the phase voltage is _____ the line voltage - ANSWER-equal to 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 distr...

False - Answer Power electronic for modern battery electric vehicles have efficiencies less than 80%. (T/F?) True - Answer A disadvantage of a DC motor with brushes and mechanical commutator (switch) is that the brushes wear out and need to be replaced. (T/F?) False - Answer Most modern electric cars use three phase variable reluctance motors. (T/F?) True - Answer Modern three phase brushless Dc motors (synchronous AC motors) have strong permanent magnets in the rotors (T/F?...

NCCER Test Questions and Answers (100% Pass) Latest 2024/2025. 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 bet...

NATE CORE STUDY GUIDE(correct answers)to passWhich of the following is not the product of incomplete combustion: Oxides of nitrogen An oil trap is required at the base of the discharge line of the vertical riser is _____ or above 8 feet A diode allows current to flow in one direction: True 1 Watt = _____ Btu 3.41 Current in a closed circuit is limited by which of the following: resistance An oil separator is located in the _____: Discharge line ___...

DC MACHINES UNIT – II SYLLABUS D.C. Generators: Principle of Operation of D.C. generators, E.M.F Equation, O.C.C. of a D.C. Generator D.C. Motors: Principle of Operation of DC Motors, performance characteristics of dc motor, Speed Control of D.C. motor (Armature voltage control and Field flux control, voltage control method) Single phase Transformer: Principle of Operation, OC & SC test on transformer Three phase AC machines: Principle of Operation

EET 231 U2 Exam Latest Updated Questions and Answers 100% Correct; ECPI University EET 231 U2 Exam Latest Updated Questions and Answers 100% Correct; ECPI University If your PLC does not have enough input connections to handle the process you are using you need to scale back the process to divide the process between two PLCs to modify the output module to accept inputs to install an expansion module Solenoids, Contactors and Lamps are usually connected to...

NORA Bronze Test Questions with 100% Verified Correct Answers what are the 3 basic parts of combustion? - Correct Answer fuel, heat, air high pressure oil forced through a nozzle does what? - Correct Answer atomizes the oil, mixes the droplets with air, allows oil to burn modern flame retention head burner motors operate at what speed - Correct Answer 3450 rpm dirt or lint buildup in the bevel of the burner motor fan blades will cause what? - Correct Answer reduce the amount of combust...

ABYC Advanced Pretest Questions & Answers 100% Accurate!! contributing factor? - ANSWER-Temperature rating of shore-cord insulation An inter-circuit short can cause: - 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? - ANSWER-Power conditioning and conversion LED navigation lights are required to meet: - ANSWER-72 Colregs Which of the foll...

COMPTENCIES, OBJECTIVES, AND PERFORMANCE TASKS Power Generation Maintenance Electrician Level Four Power Industry Fundamentals Power Generation Maintenance Electrician Level Two 26410-08 Motor Operation and Maintenance 26301-08 Load Calculations – Branch and Feeder Circuits 32401-09 Preventive and Predictive Maintenance 26409-08 Heat Tracing and Freeze Protection 40401-09 Standby and Emergency Systems 26407-08 Advanced Controls 26305-08 Overcurrent Protection 50401-10 Gene...