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Turbocharged four-stroke/cycle diesel engines utilize valve overlap for_________.

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lag behind the increased fuel supplied to the engine  enter the engine along with the increase in the fuel  enter the engine before the increased fuel supply  leave the turbocharger as a negative pulse  
hard starting  excessive fuel consumption  loss of power  all of the above  
turbocharger stalls  exhaust pressure increases  air charge density decreases  scavenge effect increases  
during the valve overlap period  with only the exhaust valve open  at a pressure below atmospheric  without cooling the cylinders or pistons  
a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine  a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine  two medium-speed, turbocharged, four-stroke diesel engines  a variable-speed AC generator  
discharge exhaust gases and smoke  furnish energy to the turbocharger  reduce engine room noise  all of the above  
turbocharger will stall  density of the air charge will decrease  scavenge effect will increase  exhaust pressure will increase  
decrease until the engine speed increases  increase as the load increases  decrease as the load  increases remain unchanged  
turbocharger malfunction or failure  crankcase exhauster overload  overload on the intercooler  obstruction in the engine cylinders  
greater than the average exhaust manifold pressure  less than the average exhaust manifold pressure  greater at the turbine wheel than at the impeller  greater at reduced engine speed  
higher torque but lower brake horsepower  lower torque but higher brake horsepower  higher torque and lower brake horsepower  lower torque and higher brake horsepower  
governor droop  speeder spring tension  fuel rack lag  load on the engine  
inoperative turbocharger  inadequate fuel supply  overload on one cylinder  unequal load distribution  
power the after-coolers  power the turbocharger  reduce the cylinder scavenge effect  cool the turbocharger  
exhaust  air box pressure  brake main effective pressure  all of the above  
constantly decreasing as engine load increase  constantly increasing as the amount of supercharging increases  approximately equal to exhaust manifold pressure at all times  approximately equal to atmospheric pressure at all times  
Excessive piston blow-by to the manifold  Insufficient cooling water flow  Accumulated water in the air boxes  Clogged air intake filters  
decreasing the amount of valve overlap  preheating the air intake  after-cooling the intake air  preheating light fuel  
restricted turbocharger air intake  oil leak into the turbocharger  dribbling injector  low fuel viscosity  
during the valve overlap period  with only the exhaust valve open  at a pressure below atmospheric  without cooling the cylinders or pistons  

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