Of the four phases listed, which one is performed before the others?
A) Electrical connection B) Piping installation
C) Evacuation and charging D) Start and check
B
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Adding a(n) ____________________ to the nonautomatic circuit breaker, by using a bimetallic element in each pole of the breaker, provides automatic tripping.
Fill in the blank(s) with the appropriate word(s).
What is indirect seeding?
What will be an ideal response?
The data display usually shows what information? 7
A) Upper limit and lower limit B) Upper limit or lower limit C) Test results D) Both B and C
If pulsed DC current is not present in the flame rod, what is the effect on the gas valve in a direct spark-ignition system?
A) Pulsed DC current has no effect on the gas valve. B) The system will shut down. C) The valve will open. D) The valve will remain closed.