When free cooling operation is not practical but the system is operating in an occupied mode, an economizer
damper will be in its _____.
a. fully open position
b. fully closed position
c. half open position
d. minimum position
d
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In a step-down transformer with a 4.16kV primary delta connection and a 480/277V wye secondary, the transformer turns ratio is _____.
a. 5:1 b. 9:1 c. 11:1 d. 15:1
When nonmetallic device boxes that are 2-gang or more are used, the installed Type NM cable must be secured no more than __________ inches from the box.
a. 8 b. 10 c. 12 d. 18
How is the ice harvested from the evaporator plates in an ice harvesting system?
A) by warming the evaporator plates with refrigerant discharge gas B) by mechanically scraping the ice off of the evaporator plates using an ice-harvesting arm C) using high frequency ultrasonic waves that shatter the plate of ice D) by energizing electric defrost heaters imbedded in the evaporator
Many things can go wrong with an air compressor, one of which is the same problem that may be encountered with hydraulic pumps. This is ____.
A. entrained air B. bearing failure C. worn cylinder walls D. vane wear