Which of the following are primarily designed for use with inductive motor loads and to withstand the interrupt current of a locked rotor?
a. Lighting contactors
b. Definite-purpose contactors/motor starters
c. NEMA-rated contactors/motor starters
d. IEC-rated contactors/motor starters
c
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Consider a tie rod transmitting a tensile force F. The corresponding tensile stress is given by , where A is the area of the cross section. The deflection of the rod is given by Equation (4–3), which is , where l is the length of the rod. Using the Ashby charts of Figures 2–24 and 2–27, explore what ductile materials are best suited for a light, stiff, and strong tie rod. Hint: Consider stiffness and strength separately.
What will be an ideal response?
Micron gauge displays can be electronic analog, digital, or ____________________.
Fill in the blank(s) with the appropriate word(s).
HVACR technicians use tools that compare pressure to atmospheric pressure. What is this type of pressure called?
A) Column pressure B) Absolute pressure C) Barometric pressure D) Gauge pressure
Technician A says that in the event of a total failure of the primary circuit in an FMVSS-121 compliant tractor-trailer combination, the rig is designed to be brought safely to a complete stop. Technician B says that in the event of a total failure of the primary circuit the relay section of the treadle valve will be actuated mechanically. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B