In order to leak test a low-pressure chiller, the chiller pressure:
A) Must be increased to a positive pressure less than 10 psig.
B) Should be increased by adding nitrogen.
C) Must be reduced to a safe level, under 150 psig.
D) Must be recovered and replaced with nitrogen.
A
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Considering the variability of the specific heats of air, plot the change in specific internal energy of the air as it is cooled from an initial temperature of 1250 K to final temperatures ranging from 300 K to 1200 K.
Given: T1 = 1250 K
Which of the following joint sealants has the highest abrasion resistance?
A) Polyurethane B) Acrylic C) Polyisobutylene D) Silicone
Answer the following statement(s) true (T) or false (F)
The desired headroom must be known to calculate the stairwell length.
How do plants “clean” the air?
What will be an ideal response?