Single 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...

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 for a 10-inch offset at 15 degrees ...

A switch in a open position - Infinite What does FLA stand for - Full loaded Amps When does the motor draw FLA - When the motors are running (full speed) I need to shut off the power before measuring - ohms infinite infinite 10 - one open one good name two motors that do nut use capacitors - Shaded pole and split phase electrically what does the capacitor do to the circuit - increases a electrical path exist between motor winding and the housing of the m...

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...

HVAC Electrical Final Review Questions with Correct Answers A switch in a open position - Answer-Infinite What does FLA stand for - Answer-Full loaded Amps When does the motor draw FLA - Answer-When the motors are running (full speed) I need to shut off the power before measuring - Answer-ohms infinite infinite 10 - Answer-one open one good name two motors that do nut use capacitors - Answer-Shaded pole and split phase electrically what does the capacitor do to the circuit - ...

imum run length of a 18AWG fixture wire that is tapped on to a 20 amp branch circuit? - ANSWER 50' When the service disconnecting means is a power-operated switch or circuit breaker, it shall be able to be opened by hand in the event of a - ANSWER power supply failure Conductors are considered outside a buildings when they are buried under not less than - ANSWER 2 in of concrete In straight pull, the length of the box shall not be less than. ____times the trade size of the largest ...

NETA III 2024 QUESTIONS WITH CORRECT SOLUTIONS The alternate source for emergency systems are required to be equipped with ground-fault protection of equipment. -Answer-False Which ANSI/IEEE standard covers SF6 circuit breakers? -Answer-C37.04 You measure the winding resistance of a 12.4kV, 1000kVA, Delta-Delta connected transformer with a 100A test set. H1-H2 measures 42.0 microhms, H2-H3 measures 41.9 microhms, and H3- H1 measures 84.0 microhms. What can you conclude from these readings...

HVAC Electricity Exam Questions and Answers Latest 2024/2025 (GRADED A+) how much resistance must be placed in 120V curcuit in order to limit the current to 2Amps - ANSWER 60 Ohms when current flows in a 2 wire circuit such as 120v, if a clamp on amp meter is clamped around both wires what measurment would you expect. - ANSWER 0 amps - due to cancellation of 2 fields Current flow is? - ANSWER The flow of electrons in the circuit. What is the symbol for impedence in an AC CIrcuit. - ANSWER ...

AWWA D 1 & D2 QUESTIONS AND ANSWERS GRADED A+ Alternating current (AC) Power in which the current flow reaches a peak In each direction only once per cycle Single phase Alternating current (AC) power in power in which the current flow reaches 3 peaks in each direction during each cycle. 3 phase The most common type of induction electric motor the rotor consists of a series of aluminum or copper bars parallel to the shaft resembling a squirrel cage. Squirrel cage induction motor...

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 armature interact. Torque ...