Installation clearances for rooftop units are required:
A) To isolate the equipment from materials that might be damaged by refrigerant leaks.
B) To ensure the correct airflow through the condenser coil.
C) To maintain a safe distance between the wiring and combustible materials.
D) To ensure that the weight of the unit does not rest directly on any roof trusses, beams, joists, or rafters.
B
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Plug and slot welds can either partially or fully fill the hole or slot?
a. True b. False
Always use two washers when the fastened material has a stress factor of _____.
a. less than 100 ksi b. more than 40 ksi c. more than 100 ksi d. less than 40 ksi
In angle measurement, a degree is divided into 100 equal parts called minutes.
Answer the following statement true (T) or false (F)
Why are valve rotators used?
A. Distribute heat across the valves evenly. B. Keep valve spring tension constant. C. Minimize carbon buildup on the valve seat and promote even wear. D. Prevent valve/piston crown collisions.