How does soot accumulation on the inside of the heat exchanger affect system efficiency?
A) The soot increases the heat exchanger internal resistance, thereby increasing efficiency
B) The soot acts like an insulator on the inside of the heat exchanger, thereby reducing efficiency
C) The soot acts like an insulator on the inside of the heat exchanger, thereby increasing efficiency
D) The soot provides extra fuel during the high fire stage, thereby increasing efficiency
B
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Consideration should be given to ____________________ to a connection if there is very little solder on the joint or if it is old.
Fill in the blank(s) with the appropriate word(s).
The accompanying figure shows the Lake House ____.
A. playroom B. living room C. loft D. kitchen
Which of the following statements is TRUE about these systems?
A) The R-22 system can operate at twice the suction line pressure drop of the R-410a system. B) The R410a system can operate at half the suction line pressure drop of the R-22 system. C) The R-22 system can operate at the same suction line pressure drop of the R-410a system. D) The R-410a system can operate at twice the suction line pressure drop of the R-134 system.
Technician A says that a low-restriction exhaust system could prevent a back pressure-type vacuum-controlled EGR (Exhaust Gas Recirculation) valve from opening correctly. Technician B says that a restricted exhaust can cause the EGR valve position sensor to fail. Which technician is correct?
A) Technician A B) Technician B C) Both technicians D) Neither technician