Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
6th Edition
ISBN: 9780135257272
Author: James D. Halderman
Publisher: PEARSON
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Textbook Question
Chapter 19, Problem 8CQ
Which of these takes place during regeneration in a diesel particulate filter (DPF)?
- a. The oxygen sensor is being cleaned
- b. Boot is being burned
- c. EGR system is being actively tested
- d. Catalytic converter is being purged
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1) Which one of the following is an undesirable byproduct of combustion in IC engines that is caused due to high temperature conditions?
O Unburnt hydrocarbons.
O Soot
O Carbon monoxide.
O Oxides of nitrogen.
2) Which one of the following statements is true about emissions from Sl engines?
OA rich fuel-air mixture decreases the tendency for more HC emissions
ONOX emissions would be maximum at a slightly rich mixture
O NOx emissions decrease as the fuel-air mixture becomes either too rich or too lean.
OA lean fuel-air mixture increases the tendency for more CO emissions
3) Which one of the following is correct about HC emission?
O t is reflective of complete combustion of fuel.
It results due to improper mixing of fuel and air
O Unburnt HCs do not contribute to photochemical smog.
O It decreases as the fuelair mixture becomes too lean
Chapter 19 Solutions
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
Ch. 19 - What is the difference between direct injection...Ch. 19 - What are the three phases of diesel ignition?Ch. 19 - Prob. 3RQCh. 19 - What exhaust after-treatment is needed to achieve...Ch. 19 - What are the advantages and disadvantages of SCR?Ch. 19 - How is diesel fuel ignited in a warm diesel...Ch. 19 - Which diesel system supplies high-pressure diesel...Ch. 19 - What fuel system component is used in a vehicle...Ch. 19 - Which of the following may be a symptom of...Ch. 19 - Technician A says that glow plugs are used to help...
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- Which emission control system introduces exhaust gases into the intake air to reduce the formation of NOXin the combustion chamber? EVAP EGR Air injection PCVarrow_forwardWhat are three possible problems that can allow fuel pressure to rapidly bleed down once the engine is shut off?arrow_forwardWhile discussing automotive emissions: Technician A says that oxygen emissions are monitored because they are an indication of the completeness of the combustion process. Technician B says that the conditions for minimizing HC emissions are the same as those that cause high NOx emissions. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forward
- While discussing the proper way to test a catalytic converter: Technician A says that a pressure gauge can be inserted into the oxygen sensor bore and the backpressure caused by the converter measured. Technician B says that restrictions in the converter can be checked with a vacuum gauge while the engine is being quickly accelerated. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forwardWhile diagnosing a PCV problem: Technician A says that a stuck open PCV valve will cause a richer than normal air-fuel mixture. Technician B says that oil in the air cleaner assembly can be caused by worn piston rings. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor Barrow_forwardWhich of the following statements regarding the “Pre-Emission Inspection Check” Of a diesel powered vehicle that is subject to Opacity (Smoke Meter) testing is not true? The governor (if equipped), the exhaust system, and the emissions control devices must all be checked. The exhaust system must be checked for any missing sections which would prevent collection of a valid exhaust sample. Vehicles not meeting requirements cannot be inspected. This is not considered an inspection or rejection and no fee is to be charged. The governor, if originally equipped, must be checked for presence, connection, and operation.arrow_forward
- Excessive oxygen in the exhaust indicates an improper air/fuel mixture. True Falsearrow_forwardWhat is a method of post-combustion control? EVAP Air injector EGR PCVarrow_forwardTechnician A says that only offshore engines are permitted to use port-helix metering fuel systems on EPA MY 2010 compliant and later engines. Technician B says that port-helix metering injection pumps can be used on current diesel engines when the peak power rating is less than 70 BHP (52 kW). Who is correct?arrow_forward
- Which of the following statements about fuel trim is not true? a. A positive fuel trim value means that the PCM detects a lean mixture and is decreasing the pulse width to add more fuel to the mixture. b. Short-term fuel trim represents changes made immediately in response to HO2S signals. c. Long-term fuel trim represents changes made to set a new base pulse width. d. Long-term fuel trim responds to the trends of the short-term fuel trim.arrow_forwardWhile diagnosing the cause for blue smoke from the tailpipe of a gasoline engine; Technician A says that a faulty fuel injection system is a likely cause. Technician B says that it is most likely caused by coolant leaking into the combustion chamber. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forwardTechnician A says that vacuum hose routing for the entire vehicle is illustrated on the underhood decal. Technician B says that this decal illustrates emission system vacuum hose routing. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forward
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