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Exam 7: Intake and Exhaust Systems

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Question 21

Multiple Choice

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Technician A says that broken vacuum hoses can cause an engine to run lean. Technician B says that vacuum leaks can cause poor fuel economy. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

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Question 22

Multiple Choice

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Technician A says that intercoolers are used in turbocharger systems to cool the turbo bearings. Technician B says that some intercoolers are water cooled. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

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Question 23

Multiple Choice

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Which of the following would most likely cause oil to be found in the air cleaner assembly?

Describe how to test boost pressure on a vehicle with a turbocharger and explain what the results could indicate.

Technician A says that vacuum is high when engine load is high. Technician B says that vacuum is high when an engine is at idle speed and no load. Who is correct?

Technician A says a broken vacuum line can cause an EGR system malfunction. Technician B says a broken vacuum line can affect turbocharger operation. Who is correct?

What purpose does the wastegate on a turbocharger serve, and how does it work?

Which of the following would be considered a vacuum at sea level?

Some air cleaner assemblies have a flow restriction indicator that indicates when the air filter needs servicing.

Technician A says that the air cleaner assembly has a bypass valve that allows air into the engine when the air filter is clogged. Technician B says that most air filters are mounted after the MAF. Who is correct?

Many intake system air ducts use a resonator to reduce noise generated within the ducts.

Intake manifolds on engines may be made of plastic.

Technician A says the catalytic converter helps reduce exhaust system noise. Technician B says a catalytic converter may be mounted into the exhaust manifold. Who is correct?

Two tools that can be used to test for exhaust restriction are the ____________________ and ____________________.

All of the following are true about turbochargers EXCEPT ____.

Technician A says that inadequate engine oil level can damage a turbocharger. Technician B says low engine oil level can cause damage to a supercharger. Who is correct?

Leaking turbocharger seals can cause ____________________ exhaust smoke.

To help extend the life of a turbocharger, the customer should allow the engine to ____________________ for about ____________________ minute(s) before shutting the engine off.

Turbochargers are being discussed. Technician A says that the compressor wheel is mounted in the air intake system. Technician B says that boost pressure is limited by the wastegate. Who is correct?

An air leak in the ductwork between the MAF sensor and the throttle plate could cause an engine to run too lean.