When solving a series RC circuit, the voltage is the reference

False: current is the Reference because in a series circuit the current is the same throughout the circuit

Power factor is defined as the ? of theta, and it can be calculated by dividing the ? in the power triangle by the ? .

cosine / kilowatts / kilovolt-amperes

Which of the factors listed contributes to the economic feasibility of making power factor corrections?

1. lower bills 2. smaller conductors 3.Smaller controllers 4.Smaller fuses

If the only criterion for power factor correction were to reduce the utility bill, the capacitors would most likely be connected at the main service in order to achieve a lower priced installation.

True Note: Generally, the lowest cost would be achieved by placing the capacitors immediately after the metering circuit at the main switchboard. Space and other factors may make this impractical.

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AC Theory 3 Test

4th period Test Lesson 2 power factor

Question	Answer
A circuit that contains resistance and capaciitance is called an RC circuit.	True
For a series RC circuit, the ? must be the same through all parts of the circuit.	Current
When solving a series RC circuit, the voltage is the reference	False: current is the Reference because in a series circuit the current is the same throughout the circuit
A series circuit has a large R and small Xc. The phase angle is close to 0°.	True
Poor power factor is normally caused by ____1____ loads on the service which results in the line current _____________ the voltage.	1. Inductive 2.Lagging
Power factor is defined as the ? of theta, and it can be calculated by dividing the ? in the power triangle by the ? .	cosine / kilowatts / kilovolt-amperes
Poor power factor is normally caused by inductive loads.	True
Power factor is normally corrected by adding a(n) ? in parallel with the load.	capacitor
Which of the factors listed contributes to the economic feasibility of making power factor corrections?	1. lower bills 2. smaller conductors 3.Smaller controllers 4.Smaller fuses
Determine the current flow in a 480-volt, 3-phase, 10-horsepower motor circuit after the circuit has been corrected to 100% power factor. (Round the FINAL answer to two decimal places.)	#5 lesson 2 answ: 8.98A
Calculate the volt-amperes for a 208-volt, 3-phase circuit that has line current of 15 amperes. (Round the FINAL answer to the nearest whole number.)	#6 Lesson 2 answe:5,398 va
If a 208-volt, 3-phase circuit that has line current of 15 amperes has a power factor of 80%, how much true power is dissipated by the circuit? (Round the FINAL answer to the nearest whole number.)	#7 lesson 2 answe: 4,318W
When capacitors are not switched from the line when the devices they correct are turned off, they should have their own disconnects.	True
If the only criterion for power factor correction were to reduce the utility bill, the capacitors would most likely be connected at the main service in order to achieve a lower priced installation.	True Note: Generally, the lowest cost would be achieved by placing the capacitors immediately after the metering circuit at the main switchboard. Space and other factors may make this impractical.

Created by: Shawnt321

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