Technician a says that carbon monoxide (co) and hydrocarbon (hc)
levels should increase if the...
Engineering, 03.12.2019 21:31 stdntlogin3206
Technician a says that carbon monoxide (co) and hydrocarbon (hc)
levels should increase if the air injection reactor (air) hoses are pinched off.
technician b says that a defective drive belt may cause air system
problems. who is correct?
a. technician a
b. both technicians a and b
c. technician b
d. neither technician a nor b
15. which of these items will least likely increase pressure in the
evaporative emission control system?
a. returned fuel from the fuel-injection system
b. inlet fuel to the fuel pump
c. fuel temperature
d. volatility of the fuel
12. as the efficiency of the catalytic converter drops through deterioration,
the switching rate of the rear o2 sensor signal will start to look like the front
o2 sensor signal. when the rear o2 sensor signal reaches approximately 75
percent of the front o2 sensor, which of the following is the result?
a. the catalyst beads in the converter should be changed.
b. the diagnostic trouble code is stored with the mil on.
c. the catalytic converter should be replaced.
d. a one-trip flag is set with a code stored, but the mil isn't activated.
7. which of these engine concerns may be caused by a stuck-open
exhaust gas recirculation (egr) valve?
a. ping (spark knock or detonation)
b. engine missing at highway speed
c. excessive nox exhaust emissions
d. rough idle/stalling
Answers: 1
Engineering, 04.07.2019 18:20, hayleymckee
Steam enters a converging nozzle at 3.0 mpa and 500°c with a at 1.8 mpa. for a nozzle exit area of 32 cm2, determine the exit velocity, mass flow rate, and exit mach number if the nozzle: negligible velocity, and it exits (a) is isentropic (b) has an efficiency of 94 percent
Answers: 2
Engineering, 04.07.2019 18:20, sanchez626
Aheavily insulated piston-cylinder device contains 0.02 m3 of steam at 300 kpa and 200 °c. 1.2 mpa. d this process. team is now compressed in a reversible manner to a pressure of etermine the entropy change and the work done on the steam during this process
Answers: 1
Engineering, 04.07.2019 19:20, Katmcfee7681
Acommercial grade cubical freezer, 4 m on a side, has a composite wall consisting of an exterior sheet of 5.0-mm thick plain carbon steel (kst= 60.5 w/m k), an intermediate layer of 100-mm thick polyurethane insulation (kins 0.02 w/m k), and an inner sheet of 5.0- mm thick aluminium alloy (kal polyurethane insulation and both metallic sheets are each characterized by a thermal contact resistance of r 2.5 x 104 m2 k/w. (a) what is the steady-state cooling load that must be maintained by the refrigerator under conditions for which the outer and inner surface temperatures are 25°c and -5°c, respectively? (b) for power saving purpose, which wall material should be increased/reduced in. thickness in order to reduce 50% of the cooling load found in part (a)? redesign the thickness of the proposed material. 177 w/m-k). adhesive interfaces between the q=575.93 w
Answers: 2
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