What is a stepper motor and why is it used with solar panel tracking systems?
What will be an ideal response?
A stepper motor is used as the drive mechanism for many types of rotary and linear solar panel access control systems. Stepper motors provide a means for precise positioning. The stepper motor has the ability to move its shaft in very small increments so that it can provide movements that are very precise.
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A) Gear clash when shifting gears B) Excessive shifting effort C) Jumping out of gear D) Excessive noise
Dropping or piling steel framing members on top of an electrical extension cord could create a(n) _____
a. tripping hazard b. fire hazard c. unusable framing member d. electrical hazard
What is the purpose of a wheel bearing?
A) Reduce friction B) Transfer weight C) Both A and B D) Neither A nor B
A cooling tower with its fan located in the air stream leaving the tower, drawing the air through the tower, is:
A) A natural-draft cooling tower. B) A hybrid-draft cooling tower. C) A forced-draft cooling tower. D) An induced-draft cooling tower.