2027/COMPLETE ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) ALREADY
GRADED A+ PASS GUARANTEED |Electrical Engineering
What is touch potential?
ANSWERS: When you touch something at a different electrical
potential from your feet or other hand.
At what kVA do transformers have 4 bushings?
ANSWERS: Above 100kVA has 4 bushings
What do you do with the neutral on a WYE-Delta bank?
ANSWERS: Float, always
What do you do with the neutral on a open wye-open delta?
ANSWERS: Always tie to system neutral
,In a delta system phase current =_?_
ANSWERS: 1.73 X Line Current,
Phase current = Coil Current
What needs to be checked before paralleling two transformers?
ANSWERS: The Impedance needs to be + or - 10%
Where should tap changers be set at _?_
ANSWERS: at 100% For normal operation
What is the displacement of a WYE-Delta or a Delta-WYE?
ANSWERS: 30° or 210°
What is the displacement of a WYE-WYE or a Delta-Delta bank?
ANSWERS: 0° or 180°
What does current determine?
ANSWERS: the magnetic strength
, What is the smallest size of wire allowed on grounding equipment?
ANSWERS: #2 Copper
What does a PT sense?
ANSWERS: Voltage
What does a CT sense?
ANSWERS: Amps
What is the worst things for a transformer?
ANSWERS: Heat, lightening.
Where are the tap changers located?
ANSWERS: On the primary coil
How does the load split on delta transformer bank?
ANSWERS: Outside transformers carry 1/3 of the single phase
load, center Transformer carries 2/3's.
Each transformer carries 1/3 of the 3-Phase load. (If there is a
larger Xfmr it can only match smaller Xfmr in 3-phase capacity.)