What is the maximum reading on a typical R410a high pressure gauge?
A) 800 psig B) 500 psig C) 120 psig D) 300 psig
A
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________ is the concept that a single cell has the genetic program to grow into an entire plant.
Fill in the blank(s) with the appropriate word(s).
Tooth type refers to the shape of the tooth
Indicate whether the statement is true or false.
What could cause a false high reading for the supply-air temperature?
A) If the temperature is taken with the blower on at the same time the heating elements are on. B) If the temperature is taken after the unit has been running for too long. C) If the probe is inserted in the supply plenum in a direct line of sight with the heating elements. D) If the temperature is taken with a probe inserted upside down.
The two most common types of overcurrent protective devices are _____
a. circuit breakers and fuses b. heaters and blowers c. Edison-base fuses and time-delay devices d. safety switches and load centers