更多"Bad valves operation of the recipro"的相关试题:
[单项选择]Starting air valves are held firmly on their seats by（）
A. cam rollers on the camshaft
B. spring force
C. air pressure on top of the valve differential piston
D. air pressure on the bottom of the valve differential piston
[单项选择]During the inspection, the starting air valves should be closed （） the engine from turning.
A. to increase
B. to speed up
C. to prevent
D. to reduce
[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]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]During （）, the starting air valves should be closed to prevent the engine from turning.
A. overhaul
B. running
C. blowing down
D. All of the above are correct
[单项选择]A knocking sound emitted from an unloaded air compressor is probably caused by （）.
A. damaged intake valves
B. excessively tight mounting bolts
C. insufficient cylinder lubrication
D. a loose piston
[单项选择]Air compressor cylinder un-loaders enable the compressor to （）.
A. vary their speed according to temperature and load
B. start and come up to speed before air compression begins
C. change speed according to overload demands
D. reduce compressed air charge density
[单项选择]In comparison to exhaust valves, intake valves of diesel engines may be fabricated from low alloy steels because （）.
A. the beveled edges of the intake valves provide for serf-centering during seating
B. intake valves utilize stellite-coated valve seat inserts which reduce wear
C. the volume of air passing through intake valves is less than the volume of air passing through exhaust valves
D. intake valves are less affected to the corrosive action of exhaust gases
[判断题]上行CoMP和下行CoMP的实现都依赖于终端。
[单项选择]Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.
A. cooling water pump
B. nozzle cooling passages
C. cylinder jackets
D. heat exchanger
[单项选择]Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A. double bottom fuel oil tank temperature
B. heater supply steam flow
C. pressure of the fuel supplied to the burners
D. attemperator steam flow in the heater discharge circuit
[单项选择]Thermostatic expansion valves can be adjusted for （）.
A. suction pressure only
B. head pressure only
C. superheat only
D. suction pressure and box temperature
[单项选择]Differential needle valves used in fuel injectors are directly closed by（）
A. cam action
B. spring force
C. fuel oil pressure
D. firing pressure
[单项选择]Bottom blow valves are installed on auxiliary water-tube boilers to （）
A. remove suspended and precipitated solids from the boiler water
B. completely drain the boiler in an emergency situation
C. prevent hardened scale deposits in the water drum
D. remove floating impurities from the oily water surface
[单项选择]Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）
A. Pressure-reducing valve
B. Unloading valve
C. Counterbalance valve
D. Pressure-relief valve
