Discuss why an industrial plant might choose to install a three-phase motor rather than a single-phase motor.
Fill in the blank(s) with the appropriate word(s).
Most power utility companies require a three-phase service installation when the connected motor load is in excess of 5 horsepower. Most three-phase motors with ratings of 1 horsepower or larger are less expensive than single-phase motors of equal ratings. Furthermore, a three-phase motor is easier to maintain than a single-phase motor. Single-phase motors usually have a centrifugal switch or, in some cases, a commutator, and thus require a great deal of maintenance. Three-phase motors have none of these devices to adjust or repair. The operating performance of three-phase motors in terms of torque, speed regulation, and efficiency is better than that of single-phase motors.
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a. Crack welds b. Cross-contamination c. Damage to vessels d. Damage to internal components
The first agricultural society to publish results of agricultural experimental work, the ______, was formed in 1785
a. Boston Society for Agrarian Arts b. Concord Society for Farmers c. New Amsterdam Society for Promoting Farming d. Philadelphia Society for Promoting Agriculture
The DOE's Building Technologies Program has a goal to increase the number of high performance buildings that will be _______% more efficient than today's typical buildings
Fill in the blank(s) with correct word
____________________ are, by far, the most widely used electrical component.
Fill in the blank(s) with the appropriate word(s).