5thMidterm2

Calculate the resistance of 200 feet of 8 AWG coated solid copper conductor. Calculate the answer to four decimal places.

.1572

Calculate the resistance of 300 feet of 10 AWG solid aluminum conductor. Calculate the answer to two decimal places.

.60

Determine the maximum number of 15-ampere receptacles permitted to be installed on a 120-volt, 15-ampere branch circuit. The circuit supplies only receptacle loads in a commercial occupancy.

10

What is the ungrounded conductor feeder demand for two 10 kW household ranges in a dwelling unit?

11000

When branch-circuit and feeder loads are calculated, which of the following nominal system voltages is not used unless specified?

115/230

What is the ungrounded conductor feeder demand for two 14 kW household electric ranges installed in a dwelling unit?

12100

An appliance store has 32 feet of multioutlet assembly. Calculate the volt-ampere load for only light use of the multioutlet assembly.

1260

What is the ungrounded conductor feeder demand for household electric ranges installed in a four-unit multifamily dwelling when the ranges are rated 8.8 kW, 9 kW, 10 kW, and 12 kW?

17000

A one-story office building measures 125 feet by 150 feet. After the lighting calculations are completed, what are the additional load calculations for general-purpose receptacle outlets, when the actual number of general-purpose receptacle outlets is unknown?

18750

What is the voltage drop on a 3-phase, 480-volt branch circuit supplying a 120-ampere load at a distance of 65 feet with 1 AWG THW uncoated copper conductors at maximum operating temperature? Calculate the answer to two decimal places.

2.08

A quadruplex multifamily dwelling has a 5 kW, 240-volt dryer installed in each unit. Calculate the feeder demand in volt-amperes for the dryers. Round the answer to the nearest whole number.

20000

Determine the general lighting load for a one-story office building that measures 125 feet by 150 feet.

24375

What is the voltage drop on a single-phase, 460-volt branch circuit supplying a 215-ampere load at a distance of 118 feet, with 4/0 AWG THWN copper uncoated conductors at maximum operating temperature? Calculate the answer to three decimal places.

3.085

A fixed appliance (non-motor operated) in an industrial building is rated at 28 amperes and is supplied by an individual branch circuit. The load is continuous, and the branch-circuit device is not rated for continuous loading at 100% of its rating. Determine the minimum standard size branch circuit required to supply this appliance.

35

Determine the smallest size THWN copper service conductor permitted for the ungrounded service conductors for a multifamily dwelling service. The calculated load for the building is 70,500 volt-amperes using a 120/240-volt, single-phase, 3-wire utility supply.

350kcmil

What is the voltage drop on a single-phase, 240-volt branch circuit supplying a 48-ampere load at a distance of 88 feet using 4 AWG RHW aluminum conductors at maximum operating temperature? Calculate the answer to two decimal places.

4.29

Determine the smallest standard size service permitted for a multifamily dwelling with a load of 95,000 volt-amperes for the line using a 120/240-volt, single-phase, 3-wire utility supply.

400amp

What is the lighting load for a two-story dwelling unit when the outside dimensions of the building measure 60 feet by 125 feet?

45000

Only the shell for an office building is to be built. It is 225 feet long, 90 feet wide, and 10 stories high. Calculate the lighting and receptacle feeder demand in volt-amperes for the building with the number of receptacles unknown.

465750

There are ? types of air that air-handling units manage.

5

What is the lighting load for a one-story dwelling unit that is 1,700 square feet in size?

5100

What is the maximum current for a single-phase 230-volt branch circuit supplying a load at a distance of 140 feet with 4 AWG copper conductors and holding the voltage drop to 2%? Use k = 12.9. Calculate the answer to two decimal places.

53.16

What is the maximum length of a single-phase, 120-volt branch circuit supplying a 10-ampere load with 14 AWG solid copper conductors permitted without exceeding a 3% voltage drop? Use k = 12.9. Calculate the answer to two decimal places.

57.35

According to Article 220, Part III, the total dryer load on a service (or feeder) neutral load of a multifamily occupancy may be calculated at ? of the ungrounded conductor volt-ampere load.

70%

What is the lighting load for a three-story dwelling unit where each floor has 900 square feet of space?

8100

What type of device measures the value of a variable and transmits a signal that conveys the information?

A sensor

What type of device accepts a control signal and causes a mechanical motion?

An actuator

? is the amount of electrical power drawn by loads at a specific moment and is measured in watts.

Electrical demand

What is the most significant benefit of a building automation system?

Energy efficiency

? are the most commonly used source of secondary power.

Engine generators

Safety circuits typically provide an output to controllers to generate alarms.

False

What are the primary targets for improving energy efficiency through automation?

HVAC systems Motor control

What type of HVAC system distributes water or steam throughout a building as the transfer medium for heating and cooling systems?

Hydronic system

What is the most common form of automatic lighting control used in buildings?

Occupancy sensors

? is a lighting control scheme that switches and/or dims groups of lamps together to a mixture of predetermined levels.

Scene lighting

What is the undesirable variation of air temperature between the top and bottom of a space?

Temperature stratification

Automated buildings are often called "smart buildings" or "intelligent buildings" because they include the controls to operate their systems optimally with little or no intervention from building personnel.

True

Net metering uses one meter that can measure power usage in either direction (importing or exporting), effectively subtracting exported electricity from imported electricity. This determines the net electricity consumption of the utility customer.

True

Steam-heating systems do not require circulating pumps because steam flows easily due to the difference in pressures between the boiler and the terminal units.

True

Which of the following does not specifically change the direct current resistance of a particular conductor?

b. Conductor insulation

While some failures in an HVAC control application cause relatively minor discomfort for the building occupants, other failures or adverse conditions may cause ? .

equipment damage life safety issues

The measure of how closely the power in an electrical system matches the nominal characteristics is called ? .

power quality

If the digital inputs for a supply-air fan control application indicate that the supply-air fan should be on, the controller compares the measured ? to the set point; if this reading is lower than the setpoint, the supply-air fan speed must be increased.

static air pressure

A ? is a device located at the building zone that provides heating and airflow as needed in order to maintain the desired set points within the building zone.

variable air-volume (VAV) terminal box