What is a general rule of thumb used when selecting temperatures that must be maintained for most greenhouse crops?
What will be an ideal response?
In general, a night temperature of 55° to 65°F and a day temperature of 10° to 15°F
higher than the night temperature must be maintained for most greenhouse crops.
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The crankcase pressure regulating valve is _____.
a. used in systems with multiple evaporators that operate at different temperatures to control the evaporator temperatures b. used to control the maximum pressure at the compressor suction line in order to protect the compressor motor from overload c. used to control system capacity in addition to limiting evaporator temperature d. adjusted for the minimum pressure specified by the manufacturer
Agriculture is not dying; it is changing
Indicate whether the statement is true or false.
The electromotive force that causes electrons to move along a conductor is called:
A) Capacitance. B) Voltage. C) Amperage. D) Resistance.
The two basic design types of radiators are
A. down flow and cross flow. B. up flow and down flow. C. cross flow and recirculating flow. D. up flow and cross flow.