Worksheet 4B cg

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Q4. Explain the operating principle of the circuit breaker and list the merits and demerits of the following circuit breakers: (10 Mark) (i) Air circuit breaker (ii) Oil circuit breaker (iii) SF6 circuit breaker (iv) Vacuum circuit breaker

Connect the initial circuit as shown in Figure 47-1.2. Set VA at 20 volts. Insert a jumper wire between points A and B and observe the meter action.OBSERVATION Current flowed for approximately ___________ seconds as evidenced by the voltagemeasured across R. The rate of charge was (linear, nonlinear) __________________.nCONCLUSION The current that flowed was the charging current that charged the capacitor to avoltage equal to (VR, VA) ____________________. Was charging current maximum atthe beginning of the charge time or near the end? _________. At the beginning of thecharge time, the voltage across R was equal to (VC , VA) _______________________(the first instant). At the end of the charge time, the voltage across the resistor is________ volts; the voltage across the capacitor is equal to VA.

Ohm's Law states that the electric current flowing though a ________ is directly proportional to the ________. Select one: a. closed circuit --- total resistance b. closed circuit --- switch resistance c. open circuit --- supply voltage d. closed circuit --- supply voltage

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please answer all questions and give me a sample ansowers 1. What code sets standards for electrical installation work? 2. What authority enforces the requirements set by the NEC? 3. Does the NEC provide minimum or maximum standards? 4. What do the letters “UL” signify? 5. What section of the NEC states that all listed or labeled equipment shall be installed or used in accordance with any instructions included in the listing or labeling? 6. When the word “shall” appears in a NEC reference, it means that it (must)(may) be done. (Underline the correct word.) 7. What is the purpose of the NEC?

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schedules are typically provided to detail the circuits and overcurrent protection required for listribution equipment. Branch-circuit - Outlet C. d. ore distribution points for electrical in .... Switch Panelboard

Two of the circuits will be a 3-wire, multi-wire branch circuit (Edison 3-wire).  The location of the devices is to be determined by the student. The student shall be responsible for selecting the correct circuits, do not ask the instructor which circuit number should be used.      Circuit A.  One lampholder and one duplex receptacle controlled by a Single Pole Switch.     Circuit B.  Single Pole Switch controlling the top half of a duplex receptacle that when energized, is indicated by a Pilot-light at the Single Pole Switch location; plus an Isolated Ground Duplex Receptacle that is always hot.     Circuit C.  The bottom half of the switched receptacle on Circuit ‘B’ is to be always hot; plus another Duplex Receptacle that is controlled from two locations using a Coast 3-Way wiring-system.

I have an O Gauge track and would like to convert it into a “sensored” track. Additionally, I would like to connect that track to an ESP-WROOM-32 board that should flash an LED whenever the track detects a non-moving train. Please list all the components (and how many of each) needed. Also, what’s the procedure for connecting the components?

Explain the procedure for carrying out a ‘voltage test’.

1. A14/2 type copper used for a general lighting branch circuit.                                                Ampacity:______________              Maximum Fuse or Circuit Breakers Sizes:________________      2.Three 8 AWG copper conductors with THHN insulation Installed in garage in electrical metallic tubing (EMT). The ambient temperature in the garage can reach as high as 110'F. All termination points for this circuit are rated 60'C.                            Ampacity:______________                  Maximum Fuse or Circuit Breakers Sizes:________________ 3.Four 4 AWG copper conductor with THWN insulation imstalled in EMT in a basement. All termination points are rated at 60'C.                                 Ampacity:______________                  Maximum Fuse or Circuit Breakers Sizes:________________  4. An 8/3 Type UF copper cable installed underground from a house to a detached garage to feed a 120/240-volt subpanel. All termination points are rated at 60'C.…