A(n) ____ is a three-terminal semiconductor device that operates as a switch when triggered into conduction by a gate signal. This device only conducts in one direction.
A. diac
B. triac
C. SCR
D. transistor
Answer: C
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This is the electrical symbol for a(n) ________.
a. Circuit Breaker b. Fuse c. Bulb d. Connector
The nervous system
A) is ideal for crisis management. B) communicates mainly by the release of hormones. C) has effects that are very long-lived. D) is regulated mainly by positive feedback. E) does not rely on the binding of receptors to target cells.
Beginning in the 1980s, the emphasis was on high ____________________ pigs: very wide down the top, especially at the shoulders.
Fill in the blank(s) with the appropriate word(s).
DC injection braking is used on _____
a. the stationary windings of AC motors b. compound DC motors where a slower stopping method is acceptable c. the rotors of shunt motors d. the rotors of series motors