The pumps employed on board ship can be divided into two main categories ie（） pumps and centrifugal pumps.

相似题目

• 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

  查看最佳答案

• On a ship，a fire pump may be used for other purposes if（）.

  A . the other services are run off a reducing station with a pressure gage B . a separate fire pump is available for use on the fire main C . all other services are operated by a manifold near the pump D . All of the above

  查看最佳答案

• 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

  查看最佳答案

• You want your Catalyst switch to implement a switching method that holds a packet in its memory until the data portion of the respected packet reaches the switch.Which method should you employ on your Catalyst switch?（）

  A . Fast Forward B . Store and forward C . Frag-free D . None of the above

  查看最佳答案

• A document which has a list of names，birthplaces，and residences of persons employed on a merchant vessel bound from a PRC port on a foreign voyage and is required at every port is called the （）.

  A . Certified Crew List B . Crew Manifest C . Shipping Articles D . Station Bill

  查看最佳答案

• In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）

  A . When the helm is at any angle other than amidships B . When the six-way valve is opened C . When the ram relief valves lift D . When the redder angle is different from the position of the helm

  查看最佳答案

• The fuel injection pumps on a diesel engine are controlled by a linkage system attached to the （）

  A . camshaft B . crankshaft C . governor D . flywheel

  查看最佳答案

• The greatest detrimental effect on idle electrical equipment, such as cargo pump motors, is the（）.

  A . loss of residual magnetism B . absorption of moisture in the insulation C . insulation varnish flaking D . dirt collecting on the winding

  查看最佳答案

• If an emergency pump control is used as the emergency shutdown on a tanker，it must（）.

  A . stop the flow of oil at the main deck manifold B . prevent the oil from leaving the shore facility C . prevent the oil from siphoning through the pump D . None of the above

  查看最佳答案

• If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.

  A . a low load on the unit B . a clogged pump suction strainer C . a blockage in the line between the pump and hydraulic motor D . the hydraulic motor turning too fast

  查看最佳答案

• If a hydraulic pump on a winch accidentally stops while hoisting,the load will stay suspended because（）.

  A . a check valve will close that prevents reverse circulation B . a centrifugal counterweight counteracts the force of gravity C . the electric pump motor cut out D . the control lever will move to the stop positio

  查看最佳答案

• If a hydraulic pump on a winch accidentally stops while hoisting，the load will stay suspended because（）.

  A . a check valve will close that prevents reverse circulation B . a centrifugal counterweight counteracts the force of gravity C . the electric pump motor will cut out D . the control lever will move to the stop positio

  查看最佳答案

• On what type of pump would you find an impeller?（）

  A . Centrifugal B . Gear C . Piston D . Vane

  查看最佳答案

• Because the timing of injection is crucial, （） mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.

  A . gears B . rams C . barrels D . cam

  查看最佳答案

• Surface irregularities, such as erosion and pitting on injection pump plungers, will（）

  A . increase ignition delay B . affect fuel oil metering C . affect engine performance at low speed D . only disappear due to fuel oil abrasio

  查看最佳答案

• When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is （）.

  A . set for maximum torque B . on the purge and vent stroke C . in the neutral position D . rotating backward

  查看最佳答案

• On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）

  A . centrifugal pump is cheaper than reciprocating pump B . the size of centrifugal pump with same capacity is smaller than that of reciprocating pump C . centrifugal pump makes maintenance easier than reciprocating pump does D . all of the above

  查看最佳答案

• Your vessel is taking on fuel oil when a small leak develops in the hose and you have ordered the pumping stoppedBefore resuming pumping，you should（）.

  A . notify the terminal superintendent B . place a large drip pan under the leak and ping the scuppers C . repair the hose with a patch D . replace the hose

  查看最佳答案

• One of the benefits of flexitime to employer is that they can hold on a more balanced work-life schedule.

  查看最佳答案

• Experts do not agree on fundamental points of the employment problems.

  A．YES B．NO C．NOT GIVEN

  查看最佳答案

• The chairman of the board_____on me the unpleasant job of dismissing good workers the firm can no longer afford to employ.

  A．compelled B．posed C．pressed D．tempted

  查看最佳答案

• The pumps press oil into the cross-head bearing gap when the load on the shell is at its lowestWhat is the meaning of “its” in the sentence above？

  A.the cross-head B.the pumps C.the shell D.the load

  查看最佳答案

• HOW TO EMPLOY AND APPLY When a company needs to employ new people, it may advertise the job in a newspaper or on a website. However nowadays, people more often find such advertisements on a website. Then people, who are interested, can apply for the job. They send in a letter (or an email) and also a resume (or CV) as well. The two parts are very important in job-hunting. The former is used to apply for a certain position. The latter is used to introduce his or her education background and work experiences. But more and more companies may often ask people to fill out a standard form. The company’s Human Resources Department will then select the most suitable people to attend an interview.

  1.According to the passage, where can we find job advertisements more often nowadays (). A.In a magazine. B.In a newspaper. C.On a website. 2.How do people apply for a job (). A.By phone. B.By email. C.Go to visit the company. 3. Besides the application letter, what else is also important() A.A resume. B.A picture. C.A certificate. 4.What do companies provide to job applicants nowadays before they apply for jobs() A.A standard form. B.An invitation letter. C.An email address. 5.Who is in charge of selecting the applicants for the coming interview(). A.The manager of the company. B.The Human Resources Department. C.The secretary of the manager.

  查看最佳答案

• Dynamic pumps are classified as centrifugal or axial. axial pumps operate on the principle of centrifugal force.（）

  是 否

  查看最佳答案