Define voltage spike.
What will be an ideal response?
A voltage spike is a sudden increase in the voltage supply that is only momentary.
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Although packaged air-conditioning equipment comes precharged with refrigerant and no field piping must be done, the installation of a rooftop package unit involves many steps and can be very dangerous.
Answer the following statement true (T) or false (F)
Design a six-bit digital-to-analog converter.
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Technician A says that crossovers are used to block certain frequencies to allow each type of speaker to perform its job better. Technician B says that a high-pass filter is used to block high-frequency sounds being sent to large woofer speakers, and a low-pass filter blocks low-frequency sounds being sent to tweeters. Who is right?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
Answer the following statement(s) true (T) or false (F)
1. The triac is a device very similar in operation to the SCR. 2. When an SCR is connected into an AC circuit, the output voltage is rectified to direct current. 3. If a variable resistor is used to control the gate of the triac, the same control problems exist as did with the SCR. 4. The triac cannot be tested with an ohmmeter. 5. If a triac is used as the controlling element for a motor, the thermostat cannot furnish the amount of gate current necessary to control the triac.