What enables a variable-rate, multi-leaf spring to become progressively stiffer as weight is added to a frame?
A. cam brackets make contact close to the center of the spring as it deflects
B. the ends of lower leaves in the spring pack come into contact with the upper leaves
C. both A and B
D. neither A nor B
Answer: C
You might also like to view...
How does air flow in a standing-pilot, natural-draft system?
A) It relies on heat to decrease the convection of the air to pull air into the combustion chamber and force flue-gases into the proper vent. B) It relies on a fan to pull the air into the combustion chamber and blow flue-gases out. C) It relies on heat to pull air into the combustion chamber and a fan to remove flue-gases. D) It relies on heat to increase the buoyancy of the air to pull air into the combustion chamber and force flue-gases into the proper vent.
Frequent troubleshooting techniques include
A) checking for stuck inputs or outputs. B) ensuring that all power pins are connected correctly. C) using voltmeters. D) all of the above.
The AS-I network protocol ____ capable of performing the closed-loop operation in a closed-loop system.
A. is B. is not
One of the most common grounding systems used for protection against accidental electrical shock is the _____
a. two-wire system b. three-wire system c. four-wire system d. five-wire system