How is a smoke candle used when troubleshooting an open display case?
A) It helps technicians trace the flow of refrigerant through the case.
B) Smoke candles are used to calibrate the case modulation damper.
C) It shows the air curtain pattern.
D) It helps locate refrigerant leaks.
C
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Which of the following is an approved wiring method allowed in fire-rated construction?
a. NM cable b. Nonmetallic raceways in free air c. Metal-clad (MC) cable d. PVC
Microspray irrigation is particularly useful for irrigating orchards, landscape beds, and in coarse, sandy
soils.
Indicate whether the statement is true or false.Which is the most widely used alternative fuel?
A) E85 B) Propane C) M85 D) CNG
___________ is a generic term for a number of industrial network protocols designed to provide real-time control of devices.
A. Ethernet/IP B. Fieldbus C. DeviceNet D. ControlNet