31.  Two technicians are discussing a turbocharger. Technician A says it improves the volumetric efficiency of an engine. Technician B says a wastegate diaphragm leak will result in a stuck closed wastegate. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B

36.    A vehicle is blowing blue/gray smoke from its tailpipe. Technician A says this is caused by coolant burning in the combustion chamber. Technician B says this is caused by oil burning in the combustion chamber. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B

32.   A vehicle has a momentary hesitation only during acceleration. The most likely cause of this condition is:

A A faulty exhaust gas recirculating valve. (EGR)

B A faulty oxygen sensor. (O2)

C A faulty positive crankcase ventilation valve. (PCV)

D A faulty throttle position sensor. (TPI)

37.   A PCM uses all of these sensors to calculate engine idle speed except:

A An engine coolant temperature sensor. (ECT)

B An exhaust gas recirculation valve. (EGR)

C An intake air temperature sensor. (IAT)

D A throttle position sensor. (TPI)

33.   Technician A says a five gas analyzer is capable of checking a vehicles emissions for oxygen. Technician B says a four gas analyzer is capable of checking a vehicles emissions for oxides of nitrogen. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B

38.   Two technicians are discussing a viscous fan. Technician A says this type of fan should be checked for leakage. Technician B says a defective relay may cause this fan to become inoperative. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B

34.   Technician A says a small crack in a vented gas cap will not alter EVAP system pressure. Technician B says the PCM will sense low tank pressure and illuminate the check engine light. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B

39.   A fuel pressure test at the fuel rail of a sequential fuel injected engine indicates low fuel pressure. All of these would cause this test result except:

A A poor ground in the pump circuit.

B A kink in the fuel return line.

C A restricted fuel filter.

D A faulty fuel pump.

35.   Technician A says an AF (Air/Fuel) Sensor is designed to reach and keep a vehicle at Stoichiometry. Technician B says Stoichiometry is 15.7:1 air to fuel mixture. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B

40.   An oxygen sensor is sending a consistent signal of .20 volts. Technician A says this indicates a rich fuel mixture. Technician B says the PCM adjusts fuel trim with the O2 sensor signal in closed loop. Who is correct?

A Technician A

B Technician B

C Both Technician A and B

D Neither Technician A or B