Chapter 13 Exhaust Systems 305 Copyright Goodheart-Willcox Co., Inc. 10. A(n) _______ provides simultaneous reduction of diesel engine exhaust emissions and noise. 1. It has been estimated that each 2 psi of back pressure causes a loss of about _______ engine horsepower. (A) 1 (B) 2 (C) 4 (D) 6 2. Technician A says that the exhaust ports in the engine and the passages in the exhaust manifold are large to allow free flow and expansion of the escaping gases. Technician B says that ports and passages are rather narrow to promote the fast movement of exhaust gas needed to turn the turbocharger turbine. Who is right? (A) A only. (B) B only. (C) Both A & B. (D) Neither A nor B. 3. Technician A says it is not advisable to remove a manifold while it is still hot, as this can promote warpage. Technician B says to clean the carbon buildup on the inside of the manifold using solvent and a scraping tool. Who is right? (A) A only. (B) B only. (C) Both A & B. (D) Neither A nor B. 4. Technician A says that it is permissible to reuse an exhaust manifold gasket if it is less than 1 year old and not cracked. Technician B says it may be necessary to retorque exhaust manifold bolts after initial warm-up and cool-down. Who is right? (A) A only. (B) B only. (C) Both A & B. (D) Neither A nor B. ASE-Type Questions 5. All of the following are causes of blue smoke from a turbocharged engine, EXCEPT: (A) air cleaner dirty. (B) seal leakage. (C) air cleaner element missing. (D) excess carbon build-up. 6. Technician A says that the job of the waste gate or turbine bypass valve is to provide a method of limiting turbocharger speed. Technician B says that the waste gate and turbine bypass valve actually divert exhaust gas to warm intake air during cold operating condi- tions. Who is right? (A) A only. (B) B only. (C) Both A & B. (D) Neither A nor B. 7. Which of the following problems can create symp- toms that appear to be turbocharger related? (A) Restricted air cleaner. (B) Plugged crankcase breather. (C) Deteriorated oil lines. (D) All of the above. 8. Charge air coolers provide all of the following effects to turbocharged engines, EXCEPT: (A) makes the air less dense. (B) reduces particulate emissions. (C) quieter combustion. (D) provides more power. 9. An exhaust brake is _______. (A) a substitute for the vehicle’s brakes (B) used to help slow the vehicle (C) found in all exhaust systems (D) All of the above. 10. Which of the following is contained in diesel engine exhaust? (A) Oxides of nitrogen. (B) Hydrocarbons. (C) Particulate matter (soot). (D) All of the above.