Answer the following statement(s) true (T) or false (F)
1. Potential transformers have ratings from 1,000 to 5,000 volt-amperes (VA).
2. Current transformers are used so that ammeters and the current coils of other instruments and relays can be connected directly to high-current lines.
3. The power factor is equal to the power in kilowatts multiplied by the apparent power in kilovolt-amperes.
4. On a three-phase, three-wire system, two potential transformers of the same rating and two current transformers of the same rating are necessary.
5. In a three-phase, four-wire system, both the interconnected potential and current secondaries are grounded to protect against possible high-voltage hazards.
1. FALSE
2. FALSE
3. FALSE
4. TRUE
5. TRUE
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Las ubicaciones peligrosas se tratan en el:
a. Capítulo 2 del NEC®. b. Capítulo 4 del NEC®. c. Capítulo 3 del NEC®. d. Capítulo 5 del NEC®.
In an RLC series circuit, if the inductive reactance is ____________________ than the capacitive reactance, the net reactance is inductive.
Fill in the blank(s) with the appropriate word(s).
Las uniones y las grietas del bloque instalado en un tanque caliente no deben ser de más de:
a. 1/8 de pulgada (0,32 cm). b. 1/4 de pulgada (0,63 cm). c. 3/8 de pulgada (0,95 cm). d. 1/2 pulgada (1,27 cm).
Many structural subassemblies are more easily or more accurately fabricated in a shop environment.
Answer the following statement true (T) or false (F)