Explain the design and purpose of bearing seals.
What will be an ideal response?
Bearing seals are circular metal rings with a sealing lip on the inner edge. These seals keep lubricant in the bearing and keep moisture, dirt, and contaminants out of the bearing.
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What will be an ideal response?
Which of the following is an example of forced convection?
A) A radiant heater placed in a room B) Air moving in a refrigerator C) A ceiling fan forcing warm air down D) Heat traveling along a metal rod
When the burner shuts off, the pump output pressure drops below 80 psig. This indicates:
A) That the oil nozzle needs changing. B) That the oil filter is clogged. C) That the oil pump has a leaky shutoff. D) Correct operation.
In a parallel circuit, ET = 240 V, R = 330 ?, and XL = 420 ?. What is Z?
A. 120 ? B. 170 ? C. 259.62 ? D. 534.13 ?