Which of the following insects feeds on human waste and then on human food, transmitting disease?
a. ant c. cockroach
b. spider d. cricket
C
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If the isoflux area boundary is fuzzy, what should you do and what will be the overall impact on system performance? Explain clearly.
What will be an ideal response?
The standard frequency of alternating current in the United States is _____.
a. 50Hz b. 60Hz c. 120Hz d. 360Hz
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.
The maximum safe level to pressurize a system with nitrogen when checking for leaks is:
A) 500 psig. B) The low-side system test pressure. C) A pressure equal to the saturation pressure at 150°F for the system refrigerant. D) The high-side system test pressure.