QUESTIONS AND CORRECT ANSWERS LATEST
UPDATED
At least 2 entrances of sufficient area must be provided giving access to the electrical
equipment working space. - ***&True
What is the Restricted Approach Boundary for a 69kV system? - ***&3 ft 10 in.
Which portion of the transmission system experiences faults occur most frequently? -
Overhead lines
A tagout device must be strong enough to remain attached under a minimum of ____
lbs of force. - 50
A piece of wire that is 0.001 inches in diameter and 12 inches long is one mil-foot. -
True
To reverse the direction of rotation of a three-phase motor, reverse: - any two leads
When can an unqualified person enter the Limited Approach Space? - ***&They are
never allowed within the Limited Approach space
Cells are connected in series to increase: - ***Voltage rating
The three-phase connection in which one end of each of the windings are connected
together is called the _____ connection. - ***delta
What is the recommended minimum insulation-resistance value for motor windings
made before 1970? - ***100 Megohms per kV + 1
A digital multimeter, when set to read voltage, has an input impedance of - ***a fixed,
high impedance regardless of range
Class 00 rubber insulating gloves are proof tested at 2,500 VAC, what color label would
you expect to find on these gloves? - ***White
,Write three thousand fortyeight tenthousandths in decimal form. - ***0.3048
What is the primary purpose of the National Electrical Code? - ***The practical
safeguarding of persons and property from electrical hazards.
Each switchboard used as service equipment should be provided with a main bonding
jumper. - ***True
Harmonics increase the risk of fire and electric shock. - ***True
The ________ section of a switchboard receives power from the service section and
feeds it to various downstream loads. - ***distribution
Three inductors of 60mH, 120mH and 75mH respectively, are connected together in a
parallel combination with no mutual inductance between them. Calculate the total
inductance of the parallel combination in millihenries. - ***26 mH
What is the distance between points (3, 5) and (4, 5) on the rectangular coordinate grid?
- ***1
Which of the following sets of terminals would you expect to find on a DLRO? - ***C1,
P1, C2, P2
Determine the RMS amplitude of this sinusoidal waveform, as displayed by an
oscilloscope with a vertical sensitivity of 0.2 volts per division: - ***0.32
The dataplate on a condenser bushing shows values for C2. What do these represent? -
***The power factor and capacitance that should be measured between the tap and the
ground flange
What does the I represent on a circuit breaker which has a solid state LSIG trip device?
- ***Instantaneous
The main advantage of aluminum bus bar is: - ***low cost
Shown below is a current transformer with the number of turns between taps. What is
the calculated voltage for taps X1 to X3 when 200 V is applied to the full secondary
winding (X1 to X5)? - ***60V
Using the diagram shown, what is the total circuit resistance? - ***10 ohms
, A given transformer has insulating fluid with a specific gravity greater than 1, from where
would you draw a sample? - top
For a DAR test of a transformer, the reading at 1 minute is divided by a reading at: -
***60 seconds
Sample valves should be flushed with at least _____ of waste liquid before collecting a
transformer liquid sample. - ***one quart
Underground service conductors between the terminals of service equipment and
service lateral or underground service conductors are termed as _____ . - ***Service
Point Conductors
In the picture below, would rated ear muffs be adequate hearing protection? - ***no
Under what considerations can tag out without lock out be permitted? - ***&If an energy
isolating device is not capable of being locked
For PV systems, a(n) _____ is a device that changes direct-current input to an
alternating-current output. - Inverter
Identify the contact pictured above. (NC and NO separated by a node) - Form C
When applying personal protective grounds, which end is attached first? - ***&The
equipment end
An induction motor has 40kVA input power, a power factor of 82 percent, and an
efficiency of 92 percent. What is the horsepower? - ***&30.2 HP
How many connection points would you expect to find on a kelvin bridge? - 4
You arrive at a job to perform acceptance testing on a new-indoor 15KV switch lineup.
While the equipment has been installed multiple covers are off there are power
conductors hanging with taped ends. What should you do? - ***&Visually confirm that
the source of power have already been de-energized and lock out
What is the turns ratio of a 3-phase 500kVA, 13,200-480 volt rated delta-delta
transformer that is 80% loaded? - ***&22.000
***27.500
ASTM D 924 is a required acceptance test for liquid-filled transformers with natural ester
insulating fluid per NETA standards. - ***&True