lighting quiz 4
1. The unit of electric current is:
c) the ampere
2. The name given to the force driving electron flow between positive and negative
terminals is:
a) voltage
3. The “ohm” is a unit of measurement for:
b) resistance
4. In a series circuit, voltages and resistances are:
b) added
5. In a parallel circuit, current at each load depends upon:
c) the resistance of each load
6. Direct current can be defined as a condition where:
d) a flow of current takes place at a constant rate in the same direction around
a circuit
7. Which of the following is not a typical use of dc power?
a) high-voltage transmission lines
8. Energy is the technical term for the more common expression:
b) “work”
9. The overall load factor is:
c) the ratio between the average and maximum power demands of a building
10. A “ratchet” clause in a utility billing plan is disadvantageous for which type of user?
b) users with a low yearly load factor
11. Devices that carry the description “energy management” have a primary function of
controlling:
b) energy use
12. What is the primary disadvantage of an automatic instantaneous demand control
system for electric power?
a) The system cannot readily adapt to varying load patterns.
1. A power utility will most likely find overhead transmission economically feasible for
voltages greater than:
b) 5000 V
2. Which of the following transmission line methods is the most expensive?
c) Type I burial
3. A “step-down” transformer:
a) has a greater number of turns in its primary coil than its secondary coil
4. In a transformer, ___ remains constant.
c) power capacity
5. A load center pad-mounted unit substation would typically have a primary voltage
range of:
d) 2.5–15 kV
6. The most popular form of exterior transformer installation for individual buildings
is
b) mounted on a concrete pad
7. Oil-insulated transformers can be expensive to install indoors because:
a) they must be placed in a fire-resistant vault
8. The use of nonflammable liquid coolants has largely been discontinued in
transformers because:
c) the coolants contain PCBs, which are banned in new installations
9. Which of the following is not a valid electrical switch class?
c) 1.5 kV
10. The advantage of using a contactor rather than a switch is that:
a) a contactor can be remote controlled
11. To protect against all types of weather conditions, one should specify an equipment
enclosure of type:
4
12. A “drawout” switchboard is:
b) a type of switchboard that has circuit breakers mounted in a movable
drawer
13. Almost all indoor unit substations use ____ transformers.
d) dry-type
14. Which of the following would be a typical dimension of a single-phase
uninterruptible power supply (UPS) unit?
c) 36 in. x 12 in. x 36 in. (915 x 305 x 915 mm)
1. Which building electrical sub-system includes panelboards and circuit breakers?
a) wiring and raceways
2. In a typical building electrical power system wiring closet, dry-type transformers are
typically placed between:
a) plug-in busways and 120-V panelboards
3. The current rating of an electrical service item is determined by:
c) the maximum temperature at which its components can operate at full load
4. Which type of interior wiring system is typically only used in industrial applications?
b) insulated cables in open raceways
5. A single conductor of No. 8 AWG standard ____.
d) is referred to as a “wire”
6. A conductor’s current-carrying capacity is referred to as its:
c) ampacity
7. Use of AC cable is typically confined to:
a) dry locations
8. A busway or busduct is ideally used when ______.
b) it is necessary to carry large amounts of current
9. The advantage of using a cablebus over a busduct is that:
d) it has a higher amperes-per-dollar first-cost
10. Lighting tracks are generally rated at:
b) 20 A
11. Raceways have now become a major architectural consideration that must be
addressed early in the design process because:
a) the proliferation of computers and networking equipment require the
distribution channels to be much wider than before
12. In a two-level underfloor duct system, ducts are run near the center of a bay in a
depressed-slab system:
d) to avoid the steel in beams or joists near columns
1. Electrical energy cost is directly related to energy consumption, except in the case
of:
a) utility demand charges
2. Which of the following occupancy types exhibits the highest air-conditioning load?
c) auditorium
3. A 120/208-V single-phase, three-wire system would be used primarily to serve:
b) a single family residence or small commercial building
4. The best distribution system for a large, multistory building that principally uses
fluorescent or HID lamps is:
d) 277/480 V, 3-phase, 4-wire
5. Which of the following is not a maxim for the safe grounding of a secondary wiring
system?
c) The neutral wire must be color-coded yellow on any insulation color other
than blue, along at least half the conductor length.
6. To avoid the risk of electric shock, it is recommended that appliance housings be
grounded to a:
b) cold-water pipe
7. In the design procedure for wiring a building, one would compute panel loads
before:
d) feeder and protective equipment ratings are computed
8. In commercial spaces, an electrical closet might be preferable to a stand-alone
panelboard for a building of ___ or more stories.
c) 6
9. Which of the following would be a good location for an electrical closet?
a) a location where conduits can enter and leave the location vertically and
horizontally
10. Which of the following volt-amperage values would be logical for a 15-A residential
circuit operating at 25% expansion?
c) 1150 V-A
11. To accommodate a home office worker, master bedrooms should be provided with
a minimum of:
a) six duplex 15-A or 20-A receptacles connected to at least two different
circuits
12. For the purpose of predicting overall building electrical load, continuous loads
should be calculated at ___ of their actual value.
c) 125%
13. If a building’s emergency power supply consists of batteries, the batteries must
have a full-load capacity of:
b) 90 minutes
1. Increases in PV module efficiency, new materials, and other initiatives have brought
the cost of PV (per peak Watt) to about:
a) $0.25–$0.50
2. “Insolation” is best defined as:
c) the amount of solar energy received by a given area, measured in Wh/m2
3. An “inverter” is a device that:
b) changes direct-current to alternating-current
4. Today’s commercial two-layer PV arrays have a maximum insolation-to-electric
energy conversion rate of:
c) 12%
5. The tilt angle of a PV array, to capture maximum insolation when the sun is lowest,
should be:
c) equal to the site latitude plus 15 degrees
6. A tracking array can increase the insolation per PV module unit area by:
c) 35%–50%
7. A direct-connected PV array might be used powering an application such as filling an
elevated water tank because:
d) a slow, interruptible fill rate does not adversely affect the water’s usability
8. A PV system battery is generally expected to supply all of an installation’s electrical
requirements for a period of ___ days of cloudy weather.
a) 3
9. Which PV system battery type requires the least maintenance?
c) sealed
10. The primary difference in design for a stand-alone PV system and for a gridconnected
system is that:
b) a stand-alone system must provide the entire electric load, while a gridconnected
system may provide part of the load
11. Which of the following is not a factor for determining the system requirements for a
stand-alone PV array?
d) the reliability of the local electric grid
12. The acronym BIPV stands for:
c) building integrated photovoltaic
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