NETA 3 ONE OFF QUESTIONS 2
What is the approximate specific gravity of Silicone insulating fluid?
0.98
Power-factor or dissipation-factor tip-up tests on large dry-type transformers that exceed __________ percent should be investigated.
1.00
What is the accepted value for a PI test on an emergency generator during maintenance testing?
1.00
An electrical clearance of __________ shall be provided for service entrance conductors having a voltage rating not in excess of 600V nominal.
10 feet
4/0 grounded cable is rated at 43kA for 15 cycles. What is the minimum number of cables per phase required to safely ground a 2500kVA 5..75%Z transformer on the 480V side?
2
A motor is operating at 3450 RPM and is producing a torque of 32 lb-in. What is output horsepower of the motor?
21 HP
What is the power factor temperature correction value of new mineral oil?
25C/100C
a 3 phase voltage voltage is 600V, power factor is 0.75 and the balanced load consumption is 21,200 watts. The load current is:
27.2 A
The number of cycles in which a high speed circuit breaker can complete its operation is:
3 to 8
Basic requirements for switchboards are covered in NEC article __________.
408
When measuring the ground resistance of a driven electrode by the fall-of-potential method, the potential electrode should be driven at what distance between the electrode being tested and the current electrode?
62%
What is a fiber optic connector?
A component created to convert data
During the inspection of a battery charger, you notice the ground fault light is illuminated. What is the most likely cause?
A load device or circuit has shorted to ground
In an open delta with a center-tapped transformer, lavel the two ends of the center-tapped transfer as L2 and L3 and label the high leg as L1. The current flow in the neutral (center tap) is
AN = A1 + (A2 - A3)
When should an equalize charge be given to a lead-acid wet cell battery bank?
After about 10 deep discharge/charge cycles, when sulfating of the plates occurs, when the electrolyte stratifies with higher concentration of acid at the bottom, and when there is a significant difference in the individual cell voltages
Which IEEE standard covers the field testing methods of cable using VLF?
IEEE 400.2
You arrive at a construction site to perform acceptance testing on a new, indoor 15kv switch lineup. The switch lineup is found in place with multiple covers removed and power conductors hanging with taped ends. What should you do?
Ignore all evidence that the lineup is de-energized and test for the absence of voltage
In a circuit containing resistance and inductance, the time required for current to reach its full value involves which of the following?
L/R
Dry cells are actually a form of:
Leclanche cell
When can systems such as emergency lighting and fire alarms be connected ahead of the normal service disconnecting means?
Only if such systems are provided with a separate disconnecting means and overcurrent protection
When may circuit breakers be installed in parallel for a single load?
Only when factory assembled
When is it not necessary to complete an energized electrical work permit?
Voltage testing, troubleshooting, or like activities
At which voltage rating should the equipment manufacturer should be contacted for recommendations before applying dc withstand acceptance tests to metal-enclosed interrupter switchgear?
above 38 kV
At which type of location might you find the presence of silver whiskers?
chemical plant
In an optical fiber, the light is transmitted through the __________.
core
Polarized capacitors are also known as __________ capacitors
electrolytic
How often is LOTO training required?
every 3 years
Harmonics can be eliminated by introducing what?
filters
If the transfer switch for a portable generator switches the __________ conductor, then it is being used as a separately derived system.
grounded
SF6 gas:
is non-inflammable
Which of the following is not required for Automatic transfer switches under the NEC? electrically operated mechanically held listed for emergency system use if rated 600V ac and below labeled for emergency use only
labeled for emergency use only
What tends to demagnetize the core of a current transformer?
large overloads of short duration on the primary
A utility defines their horizontal bus at the customer point as ABC left to right facing the customer with ABC rotation. The customer defines their buses as ABC left to right facing the utility but with CBA rotation. For a first time connection the customer has to:
leave phasing and phase sequence alone
At what voltage is it safe to wear cotton clothing?
less than 50
Time travel curves on a high voltage oil circuit breaker can reveal problems with the:
opening and closing dashpots
An object that is a good reflector is also a:
poor emitter
On a typical IAC overcurrent relay, the target and seal in coil is in series with which of the following?
time unit
How much energy does a shunt reactor require to be activated?
very little energy
