更多"An orifice-check valve placed in a "的相关试题:
[单项选择]Water allowed to accumulate in the hydraulic system oil will cause an oxidation process producing by- products which are normally （）.
A. gums, acids, and varnishes
B. removed by cellulose type filters
C. neutralized by oil additives
D. not removed by absorbent filters
[单项选择]If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）
A. have a larger than normal dead band
B. produce excessive speed response to a load change
C. respond slowly to any change in engine load
D. stabilize engine speed at the new governor setting
[单项选择]If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the （）.
A. trick wheel
B. accumulator
C. standby pump
D. telemotor
[单项选择]Accidental grounds in a shipboard electrical system must be repaired as soon as possible as they will （）
A. result in immediate power outages
B. damage circuit breakers
C. appear on the ground detection system
D. damage insulation and may cause outages
[单项选择]Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）
A. closing later
B. opening sooner
C. staying open for a shorter period of time
D. staying open for a longer period of time
[单项选择]In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.
A. suction pressure regulator
B. thermostatic bypass valve
C. sea water temperature
D. water level in the expansion tank
[单项选择]SOLAS regulations require that the inert gas system shall be capable of delivering inert gas with an oxygen content of not more than what percentage?（）
A. 5%
B. 8%
C. 6%
D. 3%
[单项选择]Zinc rods are installed in the refrigeration system （）.
A. liquid strainer
B. liquid receiver
C. saltwater condenser
D. evaporator
[单项选择]In North America the majority of the weather systems move from（）.
A. north to south
B. south to north
C. east to west
D. west to east
[单项选择]Sludge formation in a diesel engine lube oil system is caused by（）
A. carbonization of oils from the combustion chambers
B. emulsions of lube oil and water
C. coagulation of unburned fuel below the piston rings
D. all of the above
[单项选择]When it is necessary to open a refrigeration system for repairs and the system will be open for more than a few minutes, the open ends of the system should be （）.
A. dehydrated
B. purged
C. plugged
D. evacuated
[单项选择]In a combination chain and wire rope mooring system，the anchor chain is deployed at the anchor end of the line to（）.
A. increase fatigue life of the system
B. reduce the time to retrieve the line
C. increase the holding power
D. reduce the catenary
[单项选择]The car will be guided by a differential GPS system that corrects errors（）in global positioning satellite signals.
A. arising
B. rise
C. raise
D. arouse
[单项选择]Because of the reduced （）in the distillation system, some of the sea water boils as it flows through the tubes of the evaporator.
A. pressure
B. temperature
C. density
D. volume
[单项选择]The needle valve in a fuel valve will （） when the fuel pressure action on the needle valve tapered face exerts a force lower than that of the spring compression.
A. be jammed
B. be opened
C. be seated
D. be broken
[单项选择]The purpose of the deck seal in an inert gas system is to prevent（）.
A. flammable vapors from entering machinery space
B. flue gas escaping to atmosphere
C. inert gas escaping to atmosphere
D. air entering inert gas system
[单项选择]External and internal leakage in hydraulic systems may be caused by （）.
A. unusual vibration
B. excessive worn parts
C. abnormal pressure
D. any of the above
[单项选择]Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.
A. fluid friction
B. fluid turbulence
C. component misalignment
D. pressure surges
