更多"The most serious effect of air trap"的相关试题:
[单项选择]Diesel engine air start valve timing is controlled by（）
A. engine operating speed
B. an air manifold
C. a hydraulic distributor
D. individual cams and valve gear
[单项选择]The timing of diesel engine air starting valves is controlled by（）
A. the air start valve timing gears and rods
B. a cylinder check valve
C. individual cams and valve gear
D. an air manifold poppet valve
[单项选择]An indication of a diesel engine air intake being partially clogged, is （）.
A. low firing pressure and low exhaust temperatures
B. low firing pressure and normal exhaust temperatures
C. high firing pressure and low exhaust temperatures
D. high firing pressure and high exhaust temperatures
[单项选择]Diesel engine air start system check valves are opened by （）
A. an air start cam
B. cylinder compression pressure
C. starting air pressure
D. valve springs
[单项选择]Usually we take the cooling effect of the air flown through the cylinder during the overlap period as（）
A. inevitable
B. harmful
C. helpful
D. unacceptable
[单项选择]Most air conditioning units have （） for adjusting the ratio of recirculated fresh airCare must be taken not to reduce the fresh air so that stuffiness or smells arise.
A. catch plates
B. dampers
C. regulating valves
D. fans
[单项选择]The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）
A. Low compression pressure and high exhaust temperature
B. Low firing pressure and high exhaust temperature
C. Low compression pressure and low exhaust temperature
D. Low firing pressure and low exhaust temperature
[单项选择]Diesel engines obtain combustion air through turbo chargers，blowers，or（）.
A. air starters
B. carburetors
C. natural aspiration
D. air receivers
[单项选择]What is the effect of heated intake air on a diesel engine? （）
A. Increases efficiency
B. Increases engine horsepower
C. Increases engine life
D. Reduces engine horsepower
[单项选择]What is one effect of running a diesel engine at too cool a temperature? （）
A. Buildup of sludge in the lubricating system
B. Excessive fuel consumption
C. Severe heat stresses on mechanical parts
D. Foaming of the lubricating oil
[单项选择]For most diesel propulsion and generator engines, the over-speed trip device will stop the engine by （）
A. moving the governor control to stop
B. shutting off the lubricating oil supply
C. tripping the governor emergency stop lever
D. shutting off the fuel supply
[单项选择]Intake air flow from a diesel engine turbocharger is directly proportional to engine（）
A. exhaust gas pressure
B. exhaust gas temperature
C. speed
D. load
[单项选择]Trunk-type diesel engine pistons are most effectively cooled by heat（）
A. conducted through the engine block
B. conducted to water cooled cylinder walls
C. conducted through the piston crown
D. loss to escaping exhaust gases
[单项选择]The most common diesel engine fuel system problems are caused by （）.
A. incorrect adjustments
B. dirty fuel
C. broken fuel lines
D. excessive vibration
[单项选择]On most diesel engines, the governor controls the output speed by （）.
A. controlling the amount of fuel injected into the cylinders
B. varying the speed of the turbocharger
C. adjusting the compression ratio
D. changing the timing of the fuel injection camshaft
[单项选择]The diesel engine valve subjected to most severe conditions of service is the （）.
A. cylinder exhaust valve
B. air starting valve
C. air inlet valve
D. cylinder relief valve
[单项选择]
The air supplied to a diesel engine is compressed to （）
(1) provide heat for the ignition of the fuel
(2) decrease injection delay
A. (1) only is correct
B. (2) only is correct
C. both (1) and (2) are correct
D. neither (1) or (2) are correct
[单项选择]Cooling the intake air supplied to a diesel engine will （）.
A. reduce mean effective pressure
B. decrease average compression pressure
C. decrease air charge density
D. increase power output
