Specialty step-down transformers are often _____.
a. used for emergency systems in healthcare facilities
b. connected in series with the load
c. used for small work, such as doorbells and other signaling systems
d. connected to an electrical instrument, such as an ammeter, voltmeter, wattmeter, or relay
c. used for small work, such as doorbells and other signaling systems
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The specific volume of a gas that occupies 30 cubic feet and weighs 3 pounds is:
A) Specific volume = 30 ft3/3 lb = 10 ft3/lb. B) Specific volume = 3 lb/30 ft3 = 0.1 lb/ft 3. C) Specific volume = 30 ft3 + 3 lb = 33 lb/ft 3. D) Specific volume = 3 lb × 30 ft3 = 900 lb/ft 3.
Trash pumps are designed primarily to pump _____.
a. sludge b. water c. highly viscous material d. garbage
The batteries in parallel and series/parallel hybrids are charged either by the engine or by ____________________.
Fill in the blank(s) with the appropriate word(s).
When the diac has turned on, the voltage drop across its terminals is __________ the breakover voltage required to fire it.
A. the same as B. greater than C. less than