更多"One remedy for a high firing pressu"的相关试题:
[单项选择]High firing pressures and a low exhaust temperature in a diesel engine may result from （）.
A. decreased piston to cylinder head clearance
B. increased exhaust system back pressure
C. early fuel injection timing
D. low scavenge air temperature
[单项选择]High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）
A. improper fuel rack positing
B. lengthy exhaust valve duration
C. extend operation at light load
D. excessively early injection timing
[单项选择]If you hear the firing of a gun at one minute intervals from another vessel，this indicates that（）.
A. the gun is being used to sound passing signals
B. the vessel is in distress
C. all vessels are to clear the area
D. all is clear and it is safe to pass
[单项选择]One cause of high head pressure occurring in a refrigeration system can be （）.
A. insufficient cooling water flow to the condenser
B. a low refrigerant charge in the system
C. the liquid valve is open too much
D. high evaporator superheat
[单项选择]A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.
A. can’t be controlled very precisely
B. can’t be controlled as flexibly as the separate pump system
C. can be controlled as flexibly as the separate pump system
D. can be controlled more precisely and flexibly
[单项选择]（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.
A. A common rail engine；conventional engines
B. A conventional engine；common rail engines
C. A marine diesel engine；most other engines
D. A two-stroke engine；four-stroke engines
[单项选择]On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a（）.
A. vessel being towed
B. fishing vessel engaged in trawling
C. vessel at anchor warning you of her location
D. power-driven pilot vessel on station underway
[单项选择]One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the （）
A. crankcase
B. cylinder head
C. valve cover
D. engine frame
[单项选择]All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are lowWhich of the following situations is responsible for this condition?（）
A. Excessively early injection timing
B. Combustion knock
C. Leaking piston rings
D. Light load
[单项选择]When you are firing a pyrotechnic distress signal，it should be aimed at（）.
A. straight overhead
B. at the vessel whose attention you are trying to get
C. into the wind
D. about 60 degrees above the horizon
[单项选择]Which of the following firing order may be used for an 6 cylinder engine?（）
A. 1-2-3-4-5-6
B. 1-2-3-6-5-4
C. 1-5-3-6-2-4
D. 1-3-4-5-6-2
[单项选择]If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）
A. early injection timing
B. worn orifices in the injection nozzles
C. worn or scored cylinder liners
D. using a fuel with too low of a cetane number
[单项选择]To remedy a leaking fire hose connection at the hydrant，secure the valve and（）.
A. replace the gasket in the male coupling
B. reduce fire pump pressure
C. replace the gasket in the female coupling
D. rethread the male coupling
[单项选择]If a diesel engine starts firing, but is unable to come up normal speed, either without load or even under a small load, the cause may be （）
A. insufficient fuel supply
B. faulty governor
C. high exhaust back pressure
D. all of the above may cause this problem
[单项选择]Once all cylinders are firing regularly, （） is shut off.
A. the exhaust valve
B. the starting air
C. the inlet valve
D. the fuel oil
[单项选择]The firing of a red star signal may mean（）.
A. This is the best place to land
B. You are seen - assistance will be given as soon as possible
C. Tail block is made fast
D. Slack away
[单项选择]A whistle signal of one prolonged，one short，one prolonged and one short blast，is sounded by a vessel（）.
A. at anchor
B. towing a submerged object
C. being overtaken in a narrow channel
D. in distress
[单项选择]A signal of one prolonged，one short，one prolonged，and one short blast，in that order is given by a vessel（）.
A. engaged on pilotage duty
B. in distress
C. at anchor
D. being overtaken in a narrow channel
