Question

Select the correct answer for the statements in items 10 through 14, and place the corresponding letter in the space provided. A synchronous motor running on the three-phase line voltage serves the same function of power factor correction as ______ a. a bank of resistors. b. a bank of capacitors. c. an induction motor. d. a wound-rotor motor.

   Select the correct answer for the statements in items 10 through 14, and place the corresponding letter in the space provided. __________________________________
A synchronous motor running on the three-phase line voltage serves the same function of power factor correction as ________________________________________
a. a bank of resistors.
b. a bank of capacitors.
c. an induction motor.
d. a wound-rotor motor.

Electricity 4: AC/DC Motors, Controls, and Maintenance

Jeffrey J. Keljik 10th Edition

Chapter 17, Problem 14

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Step 1

A synchronous motor can operate at leading, lagging, or unity power factor depending on its excitation level. This means it can either absorb or supply reactive power to the system. Show more…

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Select the correct answer for the statements in items 10 through 14, and place the corresponding letter in the space provided. __________________________________ A synchronous motor running on the three-phase line voltage serves the same function of power factor correction as ________________________________________ a. a bank of resistors. b. a bank of capacitors. c. an induction motor. d. a wound-rotor motor.

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Key Concepts

Capacitor Bank

A bank of capacitors is a common method for power factor correction. Capacitors supply leading reactive power, which helps offset the lagging reactive power drawn by inductive loads, thereby improving the overall power factor of the system.

Synchronous Motor

A synchronous motor is an AC motor that maintains a constant speed under varying load conditions. When overexcited, it can operate at a leading power factor and supply reactive power, which makes it useful for power factor correction in electrical systems.

Power Factor Correction

Power factor correction involves adjusting the phase relationship between voltage and current in an AC system to improve its efficiency. This is typically done to compensate for the reactive power caused by inductive loads, aiming for a power factor as close to unity as possible.

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