Engine Performance Exam 1 Portage Learning Microbio 122 Biod Question And Answer

Normal engine vacuum at idle is ________. {Ans: 17-21 in Hg}What sensor is usually located between the air cleaner and the throttle body? {Ans: MAF}Why are the EGR gasses cooled before entering the engine on some engines? {Ans: Cool exhaust gas is more effective at controlling NOx emissions.}Which of the following is correct? Many exhaust systems are tuned to reduce noise and optimize flow. Exhaust manifolds must be able to slide on the cylinder head slightly as they expand due to high heat. Many exhaust systems have heat shields to protect the spark plugs and wires. {Ans: all statements are corrects exhaust}Horsepower is expressed in units of ________. {Ans: foots per pound}What sensors are used by the PCM to determine the best position of the camshafts for maximum power and lowest possible exhaust emissions? {Ans: Crankshaft position (CKP) Camshaft position (CMP) Engine speed (RPM)}