Bolts retaining the tube tower sections should be inspected for torque level every semi-annual preventative maintenance cycle.
Answer the following statement true (T) or false (F)
True
10% of the bolts should be verified during each semi-annual PM activity.
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A throttling valve in a refrigerator receives saturated liquid R-134a at 800 kPa, and exhausts the R-134a as a saturated mixture at 180 kPa.
(a) Assuming no changes in kinetic energy of the R-134a, determine the quality of the exiting mixture. (b) For the same inlet conditions, use your throttling device model and plot the exit quality of the R-134a as the exit pressure is varied between 100 kPa and 700 kPa. Given: P1 = 800 kPa; x1 = 0 (saturated liquid); P2 = 180 kPa R-134a (Take State 1 as the inlet, State 2 as the outlet.) Assume: Q?=W?=0. For a throttling valve, assume steady-state, steady-flow, single-inlet, single-outlet flow, with ?KE = ?PE = 0
How are architectural and engineering scales divided? Provide examples of common units.
What will be an ideal response?
Find the present worth of earthmoving equipment that has a first cost today of $150,000, an annual operating cost of $60,000, and a salvage value of 20% of the first cost after 5 years; these estimates being in future dollars. Assume the interest rate is 10% per year and that inflation has averaged 7% per year. Solve by hand and spreadsheet with inflation (a) not accounted for, and (b) accounted for.
What will be an ideal response?
When flushing the system, you should:
A) Always flush through the accumulator to remove accumulated debris. B) Flush through the entire system through the service valves. C) Flush through the compressor first. D) Disconnect the lines and flush through them separately.