____ are the best known of the thyristors.
A. SCRs
B. TRIACs
C. DIACs
D. JFETs
Answer: A
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Which of the following is not part of the operating sequence of a natural-draft furnace?
a. The draft inducer starts on a call for heat. b. The controls prove that the pilot is lit. c. The gas valve energizes and opens. d. The fan switch starts the blower.
What type of flooring surface is best to work on when using power tools?
a. concrete c. dirt b. wood d. none of these answers is correct
A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?
A) The dim indication is the result of a bad ground connection on the logic probe. B) The gate may be a tri-state device. C) The dim indication on the logic probe indicates that the supply voltage is probably low. D) The output of the gate appears to be open.
What is the total circuit resistance of three heat strips wired in parallel if each strip has a resistance of 12?
A) 3 B) 12 C) 36 D) 4