You can use the ____ utility to compare the contents of two files, and if there is a difference, the command reports the location at which the files first start to differ.
A. cmp
B. compare
C. diff
D. difference
Answer: A
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Saturated liquid R-134a at 120 psia enters a throttling valve. The R-134a exits the throttling valve at a pressure of 30 psia. Assume that there is no change in velocity.
(a) Determine the exit quality of the R-134a. (b) Using your model of a throttling device, determine the exit quality of the R-134a for exit pressures ranging from 20 psia to 100 psia. Given: P1 = 120 psia; x1 = 0 (saturated liquid); P2 = 30 psia 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 What will be an ideal response?
Describe power measurement in three-phase systems.
What will be an ideal response?
The transmission range (TR) switch is used to ________
A) Operate the backup lights in reverse B) Limit upshifts in manual ranges C) Keep the engine from starting in any gear position except park or neutral D) All of the above
Where can a technician determine the correct water flow rate for a water-source system?
A) Look at the manufacturer's specification sheet. B) Look on the data plate. C) Adjust the water flow until the compressor is operating at its RLA rating point. D) 4 GPM × tons = water flow