Final Review Flashcards
The ITE is found in what article of the NEC?
645
Radio and cellular phones are usually banned in the ITE center as their signals can ____.
Interfere with data transmission.
The electrical and mechanical layout for the ____ ITE center may or may not incorporate a standby generator, a UPS, and a dedicated CRAC.
Tier 1 N system
A signal reference structure (SRS) under a raised floor is to/for ____.
minimize and surpress EMI and ESD
When utility power is lost or a server disturbance occurs, the UPS ___ will shut down.
input section
A transient impulse is a high voltage, ____ duration spike on any of the utility phase conductors.
short
One of the problems that improper grounding can cause is ____.
noise on the phase, neutral, and or ground conductor.
A decrease in the RMS value of the line conductor is caused by ____.
low voltage
Faulty distribution equipment, single phase line to ground faults and incorrect tap settings on transformers are all possible causes of _____ conditions.
high voltage
The inverter in the UPS operates by ____
converting DC to AC
In the ____ UPS, the inverter is always on and connected to the output of the UPS.
line interactive
Generators are rated in (3) three operational levels: Continuous, Prime, and Standby. Which of the following statements regarding standby generators is correct.
standby generators main purposes are for emergency systems, legally required systems, and optional standby systems.
Which of the following is correct regarding generators?
unused fuel from the engine is at high temperature so it is discharged into the main fuel tank if the day tank is of small capacity.
A ____ switch is used to transfer power from a normal source to an alternate source when the normal source is lost.
transfer
The NEC requires one central means of disconnecting power in spaces designated as ____.
UPS rooms
A TVSS is designed to protect against ____.
surge voltages
Which of the following statements is correct,
watts is calculated by multiplying V times A the cosine of the phase angle between V and A
A ____ is an element of the electrical distribution system that at some point will cause downtime if a means to by-pass it is not developed in the system.
SPOF
UPS manufacturers are beginning to keep pace with ITE industry and are designing their hardware for unity power that the watts rating is the same as their ____ rating.
VA
Which of the following would probably be included ion a power quality survey conducted at a medium to large site?
fire protection systems, nearby radio station, power distribution, neutral integrity.
Which of the following is true about grounding UPS and PDU equipment?
building ground must be connected to all ground connections in the UPS system.
All isolation transformers have an inherent phase shift from primary to secondary of ____ which when used in by-pass configuration would create a potentially disruptive phase conflict when the UPS went to static by-pass.
30 degrees
Choose the best statement regarding maintenance by-pass configurations (MBP)
MBP’s can allow the UPS to be removed from the site while utility power is maintained to the critical load without interruption of power to the load.
Ground path continuity should be tested for ____ and any ground path utilizing a conduit raceway as the conducting path must have all bolted or screwed connections checked and tested.
low impedance
Large flooded cell battery installation will usually require extensive ___ and may require cell changes which are a specialized function requiring training and certification.
preventative maintenance
in addition to low emissions, quiet operation and low maintenance, fuel cells are very ____.
efficient
____ is used where electrical service interruption either impacts public health and safety or causes irreparable economic loss.
Standby Power
High temperature fuel cells deliver upwards of ____ net electrical efficiency, well above the average central station system.
45%
The basic principle of a fuel cell in its simplest form is essentially the reverse of ____.
electrolysis
Nitrous oxides, commonly identified as NOX, are not typically produced in fuel cells because these devices have no ____.
combustion
____ use a thin solid polymer membrane as an electrolyte and operate at relatively low temperatures, around 175 degrees F
PEMFC’s
____ distributed generation is used where transmission and distribution grid service is not an option.
stand alone
NFPA 70, article 692 is the standard for ____.
addressing the proper installation of fuel cells
____ is/are used to initially start a fuel cell, when the fuel cell is not yet producing electricity.
batteries internal to the fuel cell
Combined heat and power fuel cell installations us a(n) ____ to indirectly transfer heat from the fuel cell system to the customer heating load.
heat exchanger
