更多"When the load is increased on a tur"的相关试题:
[单项选择]If the compression ratio is increased on any diesel engine, （）
A. the expansion ratio will decrease
B. combustion will be slowed down
C. thermal efficiency will decrease
D. thermal efficiency will increase
[单项选择]An increase in the load on a turbocharged diesel engine operating at constant speed will result in an increase in （）
A. exhaust
B. air box pressure
C. brake main effective pressure
D. all of the above
[单项选择]When the heat load begins to increase, the needle valve of an expansion valve will（）
A. move in an opening direction
B. move in a closing direction
C. either open or close
D. not move at all
[单项选择]The greatest strain，when lifting a load with the jumbo purchase，is on（）.
A. all of the parts，dividing the load equally
B. the hauling part because it must absorb the frictional losses of all the sheaves
C. the parts in the movable block
D. the standing part because it is directly connected to the weight
[单项选择]When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will reduce, causing a fall in water level This is known as （）.
A. swell
B. shrinkage
C. flash off
D. lack of water
[单项选择]On a voyage charter，when a vessel is ready to load cargo，the Master should render to the charterer a（）.
A. Notice of Readiness
B. Master Certificate of Service
C. Shipmasters Declaration
D. Vessel Utilization and Performance Report
[单项选择]An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）
A. restricted turbocharger air intake
B. oil leak into the turbocharger
C. dribbling injector
D. low fuel viscosity
[单项选择]Performance of a turbocharged engine can be improved by（）
A. decreasing the amount of valve overlap
B. preheating the air intake
C. after-cooling the intake air
D. preheating light fuel
[单项选择]The exhaust system for a turbocharged diesel engine functions to （）
A. power the after-coolers
B. power the turbocharger
C. reduce the cylinder scavenge effect
D. cool the turbocharger
[单项选择]Clearance volume scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished （）.
A. during the valve overlap period
B. with only the exhaust valve open
C. at a pressure below atmospheric
D. without cooling the cylinders or pistons
[单项选择]In a main propulsion turbocharged diesel engine, the speed of the turbocharger varies according to the （）
A. governor droop
B. speeder spring tension
C. fuel rack lag
D. load on the engine
[单项选择]Poor quality fuel being used in a turbocharged medium-speed, diesel engine could result in （）
A. hard starting
B. excessive fuel consumption
C. loss of power
D. all of the above
[单项选择]After-cooling of a turbocharged diesel engine will result in （）
A. higher torque but lower brake horsepower
B. lower torque but higher brake horsepower
C. higher torque and lower brake horsepower
D. lower torque and higher brake horsepower
[单项选择]The power output of a turbocharged diesel engine will drop if the cooling water flow through the after-cooler is interrupted because the （）.
A. turbocharger stalls
B. exhaust pressure increases
C. air charge density decreases
D. scavenge effect increases
[单项选择]A turbocharged diesel engine will have an intake manifold pressure（）
A. constantly decreasing as engine load increase
B. constantly increasing as the amount of supercharging increases
C. approximately equal to exhaust manifold pressure at all times
D. approximately equal to atmospheric pressure at all times
[单项选择]Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.
A. improving cylinder scavenging
B. preheating the combustion chamber
C. reducing air charge density
D. preventing valve wear
[单项选择]When towing astern，increased catenary will（）.
A. increase control of the tow
B. prevent the towing vessel from going in irons
C. make the towing vessel less maneuverable
D. reduce shock stress on the towing hawser
[单项选择]If the speed of a turbocharged diesel engine is maintained constant the turbocharger speed will （）
A. decrease until the engine speed increases
B. increase as the load increases
C. decrease as the load
D. increases remain unchanged
