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自考10012轮机英语(二)模拟试题6

试题数量：54道
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练习次数：181次
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试卷简介

该试卷共包含54道试题，试题类型如下:

单选题

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1、[单选题]A gradual decrease in the discharge pressure of an operating hydraulic pump can becaused 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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2、[单选题]The rate of heat transfer from a hot region to a cold region is affected most by the_____.
- A.size of the heat sink
- B. temperature difference between the regions
- C. size of the heat source
- D. total heat of the system
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3、[单选题]Who is responsible for ensuring that someone is assigned to close the watertight doorsin an emergency? .
- A.Maritime Safety Administration
- B. Master of the vessel
- C. Chief Engineer
- D. Chief Mate
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4、[单选题]Which of the following statements is correct concerning heat transfer?
- A.Heat is given off from a high temperature region known as a heat sink
- B. Heat transfer rate is affected most by the size of the heat sink involved
- C. Heat transfer rate is affected most by the temperature difference between the heatsource and the heat sink
- D. Heat transfer by radiation will occur only by mass motion of a fluid substance
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5、[单选题]When a refrigeration compressor has developed a high head pressure as a result of arefrigerant overcharge, you should _____.
- A.increase the amount of cooling water to the condenser
- B. decrease the amount of cooling water to the condenser
- C. add more refrigerant to the system
- D. remove some refrigerant from the system
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6、[单选题]On tank vessels equipped with power operated cargo tank valves, the type of poweroperator most commonly used is _____.
- A.hydraulic
- B. electric
- C. steam
- D. diesel
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7、[单选题]If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump _____.
- A.capacity will increase
- B. capacity will decrease
- C. suction pressure will increase
- D. suction pressure will decrease
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8、[单选题]The sub-multiple prefix “nano” (n) means _____.
- A.thousandth (10 to the -3rd power)
- B. millionth (10 to the -6th power)
- C. billionth ( 10 to the - 9th power)
- D. trillionth ( 10 to the - 12th power)
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9、[单选题]A switchboard, for a AC electrical distribution system, will be provided with which of the following components _____.
- A.Frequency meter
- B. Ammeter
- C. Voltmeter
- D. All of the above
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10、[单选题]Which of the electrical properties listed will always be the same for each component in a parallel circuit?
- A.Impedance
- B. Current
- C. Resistance
- D. Voltage
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11、[单选题]A generator is prevented from becoming motorized by the use of a/an _____.
- A.over-speed trip
- B. reverse power relay
- C. back pressure trip
- D. governor controls
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12、[单选题]Aboard ship, a grounded field coil in an AC motor can be determined by using a _____.
- A.portable growler
- B. galvanometer
- C. visual inspection
- D. megohmmeter
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13、[单选题]Grease coatings on electrical contact surfaces increase contact resistance and should be removed with a/an _____.
- A.small wire brush
- B. compressed air jet
- C. clean dry cloth
- D. 10% solution carbon solvent and water
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14、[单选题]A ground in an electrical circuit outside the engine room _____.
- A.cannot be detected tinder normal conditions
- B. is of no consequence to engineering personnel
- C. is indicated at the branch circuit breaker panel
- D. is indicated by the ground detecting lamps on the main switchboard
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