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Cavitation erosion in the cooling water system of a diesel engine usually occurs at the pump impeller, and on the waterside of the （）
A . fuel nozzle holders
B . exhaust value guides
C . engine cylinder liners
D . low temperature and a low viscosity
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Under rotary pumps are the gear, （）, cam-and-piston and screw types.
A . reciprocating
B . diffuser
C . turbine
D . vane
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Which of the following statements represents the advantage of rotary pumps as compared to reciprocating pumps?（）
A . The high discharge pressure of the rotary pumps permits a larger volume of fluid per unit time than the reciprocating pump
B . Rotary pumps are capable of pumping more fluid than reciprocating pumps of the same weight
C . Rotary pumps occupy only one-half the space of reciprocating pumps
D . Rotary pumps eliminate discharge slippage of the pumped liquid, while this does not hold true for a reciprocating pum
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You are operating a multi-vendor network and are considering adding redundancy at the access level. Which routing redundancy solution should you implement?（）
A . Both Gateway Load Balancing Protocoland Hot Stand by Router Protocol
B . Gateway Load Balancing Protocol
C . Virtual Router Redundancy Protocol
D . Hot Stand by Router Protocol
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The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.
A . an isochronous governor
B . elastic engine mounts
C . a vibration damper
D . a cast iron bed plate with good flexible qualitie
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Which of the following pumps are self-priming, and can deal with liquid from a level below the pump? （） (1) reciprocating (2) rotary (3) centrifugal
A . (1)only
B . (1)and (2)
C . (1),(2)and(3)
D . (2)and(3)
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Each fire pump on a tanker must have a pressure gauge located at（）.
A . the pump discharge
B . the manifold connection
C . each fire station discharge
D . the pump statio
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For pumping the bilges，a 54 foot long “T-Boat”，which is not a ferry，but is certificated to carry 30 passengers，must be fitted with at least（）.
A . one fixed power pump and one portable hand pump
B . one fixed hand pump and one portable hand pump
C . two portable hand pumps
D . either "A" or "B"
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The simplest method to use for determining if a centrifugal pump is operating as designed, is to （）.
A . closely observe the pump discharge temperature
B . close off the discharge valve, and watch for a rise in pressure
C . momentarily close off the suction valve, and watch for a rise in pressure
D . use a clamp on ammeter and compare the readings to past record
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The control rod of a steering gear pump is attached at its outer end to （）.
A . the hunting gear
B . the rudder stock
C . the rudder controller
D . the feedback unit
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A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A . the four-way control valve failing to shift
B . the bleeder valve sticking in the open position
C . cold hydraulic fluid
D . a clogged air vent falter on the oil reservoir
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Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）
A . Loss of suction
B . Increased clearances
C . Decreased clearance
D . Decreased slippage
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When operating with a negative suction head, which of the following types of pumps will require priming?（）
A . Reciprocating
B . Centrifugal
C . Rotary
D . Gear
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The ports are drilled in the liners at an angle of approx 20℃ the result being that （） is given a rotary movement.
A . the scavenging air
B . the exhaust gases
C . the mixed air
D . the spray oil
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An individual injection pump is designed for variable beginning and constant ending of injectionFor diesel engines operating at constant speeds, the start of injection will（）
A . advance as the load increases
B . retard as the load increase
C . remain unchanged regardless
D . always occur at top dead center
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The fire pumps must be capable of delivering a total quantity of water at a defined head, not less than （） of the total bilge pumping capacity.
A . one-third
B . two-thirds
C . one-fourth
D . two-fourth
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A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.
A . reduce the engine load
B . increase the cooling water flow
C . increase the lube oil pressure
D . adjust the fuel rack
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In your database， you discovered that a tempfile in a locally managed temporary tablespace has been deleted at the operating system level. How would you recover the tablespace？（）
A . flash back the database
B . perform point-in-time recovery
C . perform a full database recovery
D . drop and re-create the tablespace
E . use Recovery Manager （RMAN） to recover the database
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Operating a propulsion diesel engine at less than 30% of designed normal load for prolonged periods will result in （）.
A . decreased fuel consumption per brake horsepower
B . more complete cylinder scavenging
C . extended valve life
D . carbon formation on combustion chamber surface
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To operate a centrifugal fire pump at reduced capacity, you should （）.
A . readjust the relief valve
B . throttle the suction line
C . throttle the discharge valve
D . open the priming line
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If you were operating a centrifugal water service pump with worn wearing rings, the （）.
A . pump would be very noisy
B . pump would vibrate excessively
C . pump would develop insufficient flow
D . stuffing box would leak excessively
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Each fire pump on a ship must have a pressure gauge located at（）.
A . the pump discharge
B . the manifold connection
C . each fire station discharge
D . the pump statio
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Many retail stores operating at one place form a department store.
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The ports are drilled in the liners at an angle of approx20℃ the result being that _____ is given a rotary movement.
A.the scavenging air
B.the exhaust gases
C.the mixed air
D.the spray oil
