In a high-pressure system _____.
a. low-pressure ductwork may be used for air distributed from a VAV box to branch ducts
b. air pressure is low up to the VAV box
c. trunk ducts are usually made of flex duct
d. return air ducts must be high-pressure ductwork
a. low-pressure ductwork may be used for air distributed from a VAV box to branch ducts
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____________________ joints are mechanical devices arranged to permit the movement of connected piping.
Fill in the blank(s) with the appropriate word(s).
Which of the following is an incorrect statement about the use of a shackle?
a. Shackles with pins worn more than 10 percent should be replaced. b. A shackle pulled out at an angle has a reduced capacity. c. A shackle should never be used such that the pin can roll under load. d. When using a shackle with a hook, the shackle body should be hung on the hook.
Refer to Exercise 12. Estimate n, and find the relative uncertainty in the estimate, from the following measurements: ?1 = 0.216 ± 0.003 radians and ?2 = 0.456 ± 0.005 radians.
What will be an ideal response?
The valve body bores are being discussed: Technician A says the bores should be measured with small bore (hole) gauges. Technician B says the bores only need to be cleaned if the damage to the valves can be corrected by polishing. Who is correct?
A. A only C. Both A and B B. B only D. Neither A nor B