When disassembling a lattice boom, workers must _____.
a. stand inside the boom and drive the connector pins out with hammers
b. stand outside the boom when removing connector pins
c. stand underneath the boom and help support it during disassembly
d. first remove connector pins between the boom pendant attachments and the boom hinge
b. stand outside the boom when removing connector pins
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Oversized suction lines:
A) Can reduce system efficiency because of a high pressure drop. B) Can reduce system efficiency because of a low pressure drop. C) Can cause poor oil return because of high refrigerant velocity. D) Can cause poor oil return because of low refrigerant velocity.
A vehicle with TPMS has tire pressure warning light on steady. The owner says that all 4 tires have the correct pressure. Technician A says that the spare tire pressure could be low. Technician B says that a sensor may be bad. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
Alexander von Humboldt was the first to notice that:
A. vegetation was distinctly different all around the globe. B. ocean currents brought oxygen to ocean plants. C. similar vegetation grew in areas with similar climate around the globe. D. tectonic plates caused the volcanoes that brought plant nutrients from the earth's core to the surface.
During the initial startup of a geothermal water source heat pump, when should the water flow be checked and adjusted?
A) after checking the system refrigerant pressures and amp draw B) after operating the unit for at least 15 minutes C) first, before operating the system D) after making sure the refrigerant charge and airflow are correct