A system using R-404a has an evaporation temperature of 0°F. If the line length is 100 ft and the system needs a capacity of 2 tons, what size line should be used?
A) 1-1/8 in B) 7/8 in C) 5/8 in D) 3/4 in
B
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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.
When memory in a vehicle ECM is described as being volatile, what happens to it when the ignition is turned off?
A. it is written to EEPROM B. it is retained magnetically C. it is activated until the next start cycle D. it is lost
The ordinates of the moment influence line at midspan B of a 2-span continuous beam are provided at every one-tenth of the span in Figure P12.56. (a) Position the AASHTO HL-93 design truck and lane loads in Figure 12.25f to produce the maximum moment. (b) Position the AASHTO HL-93 design tandem and lane loads shown in Figure 12.25(g) to produce the maximum positive moment. Which loading is more critical?
What materials are most commonly used for hydronic piping?
A) PVC and CPVC B) CPVC and polybutylene C) Copper and cross-linked polyethylene D) Copper and galvanized iron