A deepwell pump is a type of（）.

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• The discharge flow of a reciprocating pump is （）.

  A . steady B . in pulsation C . continuous D . large

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• A common trouble with the fuel pump plungers or fuel valve spindle is （）.

  A . broken down B . stuck C . oil leakage D . carbonized

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• The purpose of the wearing rings used in a centrifugal pump is to （）.

  A . prevent an internal explosion in the pump when it is overheated B . enable a visual inspection of the pump while it is running C . insure a proper alignment of the pump coupling to the driver D . accommodate for friction between the impeller and the easing

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• Which of the following types of hydraulic pumps would be used in a steering system?（）

  A . Lobe B . Screw C . Radial piston D . Volute

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• Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?（）

  A . Correct the cause of the scoring and repair the sleeve or replace with a new one B . Reassemble the unit and provide more water leak off for proper lubrication C . Check for parallel alignment of the sleeve radial faces to the sleeve bores D . Reassemble the unit and adjust the governor to obtain a slower speed

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• The usual symptoms of cavitation in a centrifugal pump is （）.

  A . noise and vibration B . an increase in discharge pressure C . an increase in suction pressure D . lifting of the relief valve

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• Which of the following statements about pump operations is NOT a correct statement?（）

  A . In order for a fluid to be pumped, a fluid must be made to flow B . A substance must be cold in order for it to be pumped C . The kinetic energy imparted by the pump can be used to force a liquid through a hydraulic system D . A pump must receive its energy from an external source

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• Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）

  A . facilitate bi-directional operation B . provide the greatest pump efficiency C . prevent pump clogging from marine growth D . prevent cavitation at the pump outlet

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• The pressure head of a pump is given in the unit of （）.

  A . kg B . MPa C . meter fluid column D . None of the above is true

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• While overhauling a jerk-type fuel pump it is necessary to replace the pump plungerWhich of the parts listed below must also be replaced?（）

  A . Delivery check valve B . Pump barrel C . Tubing to the injector D . Cam follower

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• A relief valve for a cargo pump is generally installed（）.

  A . after the discharge valve B . between the pump and discharge valve C . after the suction valve D . between the pump and suction valve

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• The function of a centrifugal pump double volute casing is to （）.

  A . reduce radial thrust to the impeller B . double the liquid velocity through the pump when compared to a single volute C . reduce hydraulic end thrust D . provide the effect of multi-staging

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• Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）

  A . changes the position of the fuel inlet ports B . changes the length of the pump stroke C . varies the quantity of fuel delivered D . varies the compression of the delivery valve spring

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• A centrifugal pump vibrates excessively during operationUpon disassembling the pump it is found that the impeller is out of balanceWithout an available spare, you should （）.

  A . drill holes through the heavy side of the impeller until it balances B . weld counterweights to the light side of the impeller C . remove metal from the heavy side by machining in a lathe D . acid wash and serape the heavy side until it balance

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• What is a characteristic of all centrifugal cargo pumps? （）

  A . They are self-priming B . Decreasing the speed of rotation will decrease the discharge pressure C . Opening the discharge valve wider will increase the discharge pressure D . All of the above

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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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• Gear pumps are （） type because they discharge a near constant amount of liquid regardless of pressure.

  A . positive displacement B . non-positive displacement C . mixed-flow D . axial-flow

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• The injector pump is operated by a cam which drives the plunger （）.

  A . top and bottom B . to and fro C . up and down D . back and forth

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• A pump is said to have "negative suction head" when the pump is located （）.

  A . between the suction and discharge B . below the liquid supply C . above the liquid supply D . any of the above

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• If a hydraulic pump is overheating, the cause may be （）.

  A、excessive internal leakage in the pump B、low discharge pressure and fluid flow C、excessive fluid level in the hydraulic reservoir D、operation of the pump at 100% efficiency

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• A contra-guide is a type of（）.

  A . bow thruster B . cargo gear C . steering engine D . rudder

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• Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.

  A . controller B . governor C . instrument D . apparatu

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• A pump is defined as device that（）

  A . produces pressure B . imparts energy to a fluid to move it from level ‘A’ to level ‘B’ C . creates a vacuum to move a liquid in all installation D . is to develop a pressure differential

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• Which of the devices listed is common to all types of pumps?（）

  A . A power end and fluid end B . A propeller and educator C . A volute and impeller D . A turbine and pisto

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