Phase transformer - Study guides, Class notes & Summaries
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Second Year IEC Final Exam Questions and Answers 100% Pass
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Second Year IEC Final Exam Questions 
 
and Answers 100% Pass 
 
______ in utility transmission lines reduces the power losses in the transmission conductors. 
increasing the voltage 
 
______ shall not support luminairs weighing over 6 lb. lampholder 
 
_______ surrounds the windings in typical "pole-mounted" transformers. oil 
 
40C = ____ F 104 
 
A .25KVA transformer has a nameplate rating of 240/480 primary volts 120/240 secondary 
volts. IF rated voltage is applied to the primary the sec...
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Master Electrician's Exam Prep Guide Final Exam #1 CORRECT 100%
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Given: after all demand factors have been taken into consideration for an office building, the demand load is determined to be 90,000 VA; the building has a 120/240-volt, single phase electrical system. What MIN. size copper conductors with THHN/THWN insulation are required for the ungrounded service-lateral conductors? Consider all termination lugs are rated for 75 deg. C. 
 
A. 400 kcmil 
B. 350 kcmil 
C. 300 kcmil 
D. 500 kcmil - ANSWER D. 500 kcmil 
pg. 142, 153, 161 
 
Given: a commercial b...
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NERC Practice Test (2024 / 2025) Questions with Verified Answers, 100% Guarantee Pass Score
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NERC Practice Test (2024 / 2025) Questions with Verified Answers, 100% Guarantee Pass Score A transmission line is operating with a voltage phase angle different of 30 degrees 
between the sending Vs and the receiving busVr. If the receiving endload is suddenly 
increased, the voltage phase angle difference will be? 
Answer The phase angle will increase.When load is increased phase angle will increase. 
2. A load has a power factor of 0.9 lagging. If the load draws 100 MVA, what isthe MW 
draw? ...
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NCCER Electrical Set Test Questions And Verified Correct Answers
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NCCER Electrical Set Test 
Questions And Verified Correct 
Answers 
A 3-phase, 4-wire, 480v service requires ______ 
current transformer(s) - ANSWER : 3 
Services conductors and equipment are covered in 
- ANSWER : NEC Article 230 
The NEC required that all receptacles installed on 
25 amp and 20 amp branch circuits be ______ 
receptacles - ANSWER : Grounding 
A transformer with the primary of 400 turns and a 
secondary of 300 turns has a _____ - ANSWER : 
Step-down turns ratio of 4:3 
T...
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DMIR 1121 Final || All Correct.
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What is the name of the process that changes alternating current into direct current? correct answers Rectification 
 
What is the most accurate type of timer? correct answers Electronic 
 
Where in the x ray circuit is the timer circuitry located? correct answers Between the auto transformer and the step up transformer 
 
What is the advantage of three phase equipment over single phase equipment? correct answers Can achieve shorter exposure times 
 
The spinning top test can be used to determin...
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NCCER 26201 : Alternating Current - Electromagnetic Induction - (AC) Circuits Exam Test Combined Questions With Revised Correct Answers BEST UPDATED COMBINED SET!!
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NCCER 26201 : Alternating Current - Electromagnetic Induction - (AC) 
Circuits 
Exam Test Combined Questions 
With Revised Correct Answers 
BEST UPDATED COMBINED SET!! 
 
20. according to the power triangle, the apparent power 
is ______. - ANSWER 
(C) greater than the true power 
21. which of the following uses electromagnetic 
inductions to transfer electrical energy from one circuit 
to another. - ANSWER 
(C) Transformer 
22. given: a Transformer has 200 turns in the pri...
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Traffic Signal Technician Level II (Latest 2024/ 2025 Update) Questions and Verified Answers| Grade A| 100% Correct
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Traffic Signal Technician Level II (Latest 2024/ 2025 Update) Questions and Verified Answers| Grade A| 100% Correct 
 
 
Q: Check for proper operating DC voltage, check for the absence of red on a phase that does not have green, yellow, or walk, check on a simultaneous are functions that are provided by both - 
 
 
Answer: 
CMU and MMU 
 
 
 
Q: What is the purpose of relays in a traffic signal system? 
 
 
Answer: 
to transfer the outputs from one component to another 
 
 
 
Q: What device mini...
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NETA ETT Certified Level 3 Questions and Answers Graded A+
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NETA ETT Certified Level 3 Questions 
 
and Answers Graded A+ 
 
A newly installed 4160V emergency generator has an insulation resistance value of 150 
Megohms after one minute with an equipment temperature of 32 degrees C. Is this value 
acceptable per NETA standards? 
No 
 
NETA ATS-2017 Table 100.11 
 

 
Know the NETA-ATS Insulation Resistance tables 
 
Which test method measures Hydrolyzable Flouride content in SF6 gas? 
ASTM D2284 
[Standard Test Method for Acidity of Sulfur Hexafluoride] ...
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Role-specific Electrical Engineering Interview Questions & Answers:
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e 
 * a) Three phases are connected together at the start point 
* b) Three phases are separate 
* c) Neutral conductor is connected to a single phase 
* d) Neutral conductor is electrically separated 
Answer - a 
 2. A single-phase double-wound transformer consists of 
 * a) A single core mounted winding 
* b) A winding that carries the difference between IP and IS 
* c) A single solid core 
* d) Two electrically separated coils 
Answer - d 
 3. One method of insulating windings is to u...
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LRA 222 Final Exam| Questions and Verified Answers - (2024/ 2025 Update) 100% Correct | Grade A
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LRA 222 Final Exam| Questions and Verified Answers - (2024/ 2025 Update) 100% Correct | Grade A 
 
Q: A diode allows electrons to flow from _____. 
 
 
Answer: 
cathode to anode 
 
 
 
Q: True or False? The mAs timer is usually set to give the lowest mA at the longest time? 
 
 
Answer: 
False 
 
 
 
Q: What is amplitude? 
 
 
Answer: 
Height of a wave 
 
 
 
Q: Variations in power distribution to the xray machine are corrected by the _____. 
 
 
Answer: 
Line voltage 
 
 
 
Q: What is the most ...
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