EXAM QUESTIONS AND ACCURATE ANSWERS
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What is the turns ratio of a 3-phase 500kVA, 13,200-480 volt
rated delta-delta
transformer that is 80% loaded? -
ANSWER-27.500
Voltage regulators have loads connected to the: - ANSWER-
Shunt Winding
A current limiting protective device will cut off the maximum
peak fault current for currents within its current limiting range
is less than which of the following? -
ANSWER-0.5
Which of the following protection element tests would you
most likely perform
on a new 21 device? - ANSWER-
Determine offset
,Which of the following relay operates when there is a vector
difference between
two or more similar electrical quantities: -
ANSWER-Differential
NETA Maintenance Testing Specifications require that the time
delay of a solid-
state 51 relay be tested at how many points on the time
current curve? -
ANSWER-
2
Thermal relays are commonly used in motors to protect
them against: -
ANSWER-
Overloads
How many inputs does a NOT gate have? - ANSWER-one
IDMT relays protect transformers from which of the following
faults: - ANSWER-
Overloads and External Short
Circuits
Which relay is affected by arc resistance more than any
other type? -
ANSWER-
MHO
,The voltage rating of a surge arrester installed on an
ungrounded system over
1000V shall be equal to or greater than the continuous: -
ANSWER-Phase-to-
neutral
voltage
When applying differential protection to a transformer, which
of the following
factors would not be a consideration? -
ANSWER-impedance
What size overload would you most likely use for a 3-phase
480V 100HP
induction motor with a FLC of 124A? -
ANSWER-140 A
NFPA 70, the National Electrical Code, requires Inspections
and Tests on
equipment over 1000V. Where is this in the code? -
ANSWER-225.56
An insulation resistance test is performed on an apparatus
containing oilimmersion insulation, a reading of 2 megohms is
measured at 104°F. What is the temperature corrected value @
20°C? - ANSWER-7.90 Megohms
, Which device would be used to provide precise voltage
regulation to protect
equipment from overvoltage, undervoltage, sags and
swells? - ANSWER-
Voltage
Stabilizer
Type ____ cables shall have an internal bonding strip in
intermediate contact
with the armor for its entire length. -
ANSWER-AC
Armor Clad
"Armor"
In an RC parallel circuit, the current through the resistor and the
current through
the capacitor are - ANSWER-less than 90° out of phase with the
resistor current
lagging
Capacitors are introduced to systems to
lead the PF
If a cable has 133% insulation and has relay protection, how
long will it hold a
faulted current? - ANSWER-
1 hour