Two technicians are discussing catalytic converters. Technician A says that the exhaust mixture must fluctuate between rich and lean for the best efficiency. Technician B says that the air-fuel mixture must be leaner than 14.7:1 for best performance from a three-way catalytic converter. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
A
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The crankshaft is pushed forward in the engine by pressure in the torque converter or by the release spring pressure of the clutch. Forward and backward movement is called ____.
A. end thrust B. bearing spread C. torsional vibration D. bearing crush
Apple trees do best in cool climates
Indicate whether the statement is true or false
A piston-cylinder device initially contains 100 moles of an ideal gas at T = 353.15 K and P = 0.1 MPa. The ideal gas has CP* = (7/2)R. Heat is added and the gas expands isobarically until its volume is twice its initial volume. How much heat was added?
A. -561. kJ B. 1 MJ C. 233. kJ D. 2 MJ E. Insufficient information to solve
Technician A says that exhaust leaks can affect the air-fuel mixture of an engine. Technician B says that exhaust leaks can be dangerous for customers driving their car. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B