The measured inductance of a power line 110 kilometers long is found to be 295 millihenery. What is the inductance of the line per meter? Express the answer to the nearer hundredth microhenery.
Fill in the blank(s) with the appropriate word(s).
2.68
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Discuss why an outside testing agency may be contracted by the owner.
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. Dynamic braking is a method used to help bring a motor to a quicker stop with the extensive use of friction brakes. 2. The starting current of a squirrel-cage induction motor can be reduced by using a resistance starter controller, which inserts equal resistance values in each line wire at the instant the motor is started. 3. An automatic compensator is used to automatically connect an autotransformer in series with the motor during the starting cycle, which results in a reduced starting current. 4. When an electronic controller for wound-rotor motors includes power resistors inserted into the secondary rotor circuit, the more resistance inserted, the slower the speed of the motor. 5. Local building and electrical code authorities should be consulted before installations are made with motors and controllers that do not comply with National Electrical Code® rulings.
A manometer is attached to a vacuum pump, which results in unequal pressure between each of the two arms. How is the vacuum measured?
A) The movement of fluid in each side is compared. B) A gauge attaches to the bottom of the manometer. C) The side that is open to the atmosphere is gauged. D) The side that is attached to the vacuum is gauged.
The ____ wave is the most basic and widely used of all the AC waveforms.
A. sine B. square C. triangular D. sawtooth