Why do direct spark ignition furnaces and hot surface ignition furnaces require redundant gas valves?
A) in case one fails to open, the other will B) so that the unit will not overheat
C) because they require more fuel D) for safety since there is no pilot safety solenoid
Question 2
Which of the following statements applies when heating a bearing with a torch during the removal process?
a. Never use a propane torch.
b. Use an aluminum ring for a heat sink.
c. Cool the bearing with a wet cloth as soon as it is removed.
d. Do not reuse a bearing removed this way.
Surface Features on Europa
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Observed global land and ocean surface temperature anomalies since 1850