Which switching device uses LEDs?
A) Pickup coil B) Hall effect
C) Optical sensor D) Magnetic reluctor
C
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Answer the following statement(s) true (T) or false (F)
1. The wattage rating of a resistor indicates the amount of heat that the resistor can dissipate without damage. 2. Variable resistors have a set ohm value that cannot be changed. 3. A capacitor is a battery. 4. Capacitance is measured in Henrys. 5. An inductor’s ability to set up a magnetic field is called inductance.
The difference between an SCR and a diode is that an SCR _____.
a. has three terminals b. is bidirectional c. has a drain connected to the negative terminal d. is normally open
The ____ six-lead motor is popular because of its dual-voltage rating capability.
a. IEC b. NEMA c. WYE d. voltage
To trap metals and mineral salts, the cold-water inlet should be provided with a(n) _____.
a. activated carbon filter b. reverse-osmosis filter c. sediment filter d. deionizing filter