The three substances that form natural magnets are _____.
A. iron, boron, and cobalt
B. copper, iron, and cobalt
C. copper, nickel, and boron
D. iron, nickel, and cobalt
Answer: D
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The ____________________ provides the crucial air gap across which the high voltage from the secondary coil causes an arc or spark.
Fill in the blank(s) with the appropriate word(s).
What is one cause of ice and frost on fan blades and fan guards in a walk-in freezer?
a. The fan delay control in the evaporator is stuck closed. b. The drain line is frozen and ice backed up into the evaporator coil. c. The defrost termination on the time clock is bad and it stays in defrost too long.
The factors that must be considered when sizing the discharge line are:
A) Pressure drop and velocity. B) Pressure drop, temperature rise, velocity, and oil viscosity. C) Temperature rise and oil viscosity. D) Temperature rise and refrigerant viscosity.
If a concrete masonry lintel measuring 8" x 8" x 5.5' weighs 275 pounds, what is the weight in pounds per linear foot of such a lintel?
What will be an ideal response?