Phase transformer - Study guides, Class notes & Summaries

Master Electrician (First Set 1-85) with Complete SolutionsMaster Electrician (First Set 1-85) with Complete SolutionsMaster Electrician (First Set 1-85) with Complete SolutionsMaster Electrician (First Set 1-85) with Complete Solutions A 150 kVA service transformer has a 480Y/277 volt 3-phase primary and a 208Y/120 volt, 3-phase secondary. What is the approximate full-load ampere rating of the primary of the transformer? - ANSWER-180 amperes Where a conductor is marked RHW-2 on the insulati...

Enphase Storage Design Certification Training Questions and Answers Already Passed Which component of the Ensemble system detects a grid failure? A. Envoy B. Enpower C. Encharge B. Enpower True or false: PV systems with Energy storage but without backup power do not require Enpower. True Where do the hot conductors between Encharge and Enpower terminate? A. In the IQ Combiner box B. At the DER (distributed energy resource) input terminals C. On the Encharge circui...

Electricity PREP TEST QUESTIONS WITH VERIFIED ANSWERS The size of the conductor is proportional to the amount of the current. True or False? - ANSWER True. What happens when a conductor moves relative to a magnetic field and it passes through the lines of magnetic flux? - ANSWER A voltage is induced in the conductor. What is Electro-magnetic Induction? - ANSWER As long as there is movement between a conductor and a magnetic field, an induced voltage is created. Describe what the ...

A transmission line is operating with a voltage phase angle different of 30 degrees between the sending Vs and the receiving bus Vr. If the receiving end load is suddenly increased, the voltage phase angle difference will be? CORRECT ANSWER The phase angle will increase. When load is increased phase angle will increase. A load has a power factor of 0.9 lagging. If the load draws 100 MVA, what is the MW draw? CORRECT ANSWER 90 pf= mw/mva The high side of a delta-wye connection transformer i...

Voltmeter - Answer A high resistance is connected in series with the internal coil of a galvanometer to make? If a transformer ratio is 20/1, what does it mean for the secondary? - Answer The primary voltage is 20 times greater than that of the secondary. If a motor enclosure is designed to contain sparks or flashes that could ignite surrounding vapors or gases, then the enclosure is considered to be which of the following: - Answer Ventilated The output of a 3-phase transforme...

Q32618 When a high voltage transmission line circuit breaker trips open as a result of a fault, a synchronous check relay will monitor certain values on both the line side and the bus side of the open circuit breaker. Before the synchronous check relay re-closes the open circuit breaker, which of the following values has to be within a certain limit before the circuit breaker will close automatically? CORRECT ANSWER •) Frequency •) Voltage Magnitudes •) Phase Angle between the voltages ...

A 150 kVA service transformer has a 480Y/277 volt 3-phase primary and a 208Y/120 volt, 3-phase secondary. What is the approximate full-load ampere rating of the primary of the transformer? - ANSWER180 amperes A 50 kVA transformer with a 480-volt, 3-phase, primary and a 208Y/120 volt, 3-phase secondary is to be installed. Overcurrent protection is required on both primary and secondary sides of the transformer. Determine the MAXIMUM standard size overcurrent protection device permitted on the ...

In general, transformer secondary conductors are not considered to be protected by the primary overcurrent protective device. TRUE 240.4(F) An installation consists of a 10-kVA, single-phase transformer with a 440-volt primary and a 110-volt, 2-wire secondary using THWN copper conductors. No secondary OCPD is installed. The secondary loads are considered to be noncontinuous loads. Calculate the minimum size secondary conductors required to handle the secondary full-load current for this transf...

Unused openings in equipment shall be closed To afford protection equivalent to the wall of the equipment With flame resistant tape With metallic or non metallic materials .004 inches in thickness With metal 1/8 inch in thickness correct answersTo afford protection equivalent to the wall of the equipment The interior of raceways installed underground shall be considered to be locations Dry Damp Wet Moist correct answersWet Parallel conductors comprising each phase, polari...

Stationary Engineer Electric Exam Questions With Correct Answers Latest 2024/2025 (Graded A+) A 10-ohms and 20-ohms resistor are connected in parallel. The total line current drawn by this parallel combination is 30 amps. Under these conditions, the line voltage will be ____________ volts. - Answer 200 A 20-ohm resistor is connected in series with a parallel combination of two resistors, one of which is 10-ohms, the other 40-ohms. If the voltage across the parallel combination is 40 volts, ...