更多"The sudden reduction of pressure oc"的相关试题:
[单项选择]Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an （）
A. engine support vibration isolator
B. detuner or viscous fluid damper
C. lightened crankshaft flywheel
D. spherically seated crankshaft bearing
[单项选择]To maintain the down stream pressure within defined limits over a range of flow and despite any changes in supply pressure, （） is fitted.
A. a check valve
B. a gate valve
C. a pressure reducing valve
D. a quick closing valve
[单项选择]Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by（）.
A. leaky discharge valves on the LP cylinder
B. leaky discharge valves on the HP cylinder
C. insufficient intercooler cooling
D. low ambient air pressure
[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]Wear occurring at the tips of the reduction gear teeth is usually the result of （）.
A. surface fatigue
B. fretting corrosion
C. heavy overloading
D. gear misalignment
[单项选择]A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）
A. a leaking fuel injector nozzle
B. a clogged air filter
C. excessively early fuel injection
D. malfunctioning valves
[单项选择]The fuel oil pressure and forced draught pressure should be matched to ensure good combustion with a full steady flameIn the sentence the word “match” means （）
A. join with
B. mix
C. be equal to
D. be constant
[单项选择]The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
A. Cross
B. Parallel
C. Counter
D. Circular
[单项选择]High pressure and low pressure alarms must be tested（）.
A. no earlier than 24 hours prior to loading
B. no later than 24 hours prior to loading
C. anytime prior to loading
D. weekly
[单项选择]The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.
A. soluble state
B. solid state
C. liquefied state
D. inert state
[单项选择]The area of strong westerly winds occurring between 40°S and 60°S latitude is called the（）.
A. polar easterlies
B. prevailing westerlies
C. roaring forties
D. jet streams
[单项选择]Restrictions occurring in the small orifices of pneumatic control system components can be used by （）
A. moisture in the compressed air supply
B. excessive dryness in the compressed air supply
C. pressure surging in the compressed air receiver
D. insufficient lubrication of the system components
[单项选择]To prevent accidents from occurring, special valve chests are used in such cases in which interchangeable blanks and connecting passages are incorporatedThe bold and italic word “which” means （）.
A. accidents
B. special valve chests
C. interchangeable blanks
D. connecting passages
[单项选择]To avoid scavenge fires occurring the engine timing and equipment maintenance （）.
A. should be correctly carried out
B. should correctly be taken place
C. should carried with care
D. must to carry out with great care
[单项选择]Combustion knock occurring in a diesel engine can be caused by （）
A. low coolant temperature
B. insufficient fuel
C. high ambient temperature
D. carbon buildup on the injector tips
[单项选择]What determines the number of events occurring in a cycle of operation in an internal combustion engine?（）
A. Crankshaft revolution
B. Type of engine (diesel or gasoline)
C. Distance a piston travels during a stroke
D. Number of pistons
[单项选择]Logbooks are used to record the events occurring when（）.
A. the ship is in a harbor
B. the ship is at anchorage
C. the ship is underway
D. All of the above
