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No．1 speed sensor signal malfuniction的中文意思是（）。
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第二组：Magnetic pickup (MPU) sensors are devices which can be used in conjunction with electronic control modules for monitoring of parameters such as speed, direction of rotation and a variety of alarm conditions. MPU sensors are available in various sizes and types. Following are some guidelines for their selection on industrial engines. MPUs are located near a flywheel, camshaft or other type of gear with rotation relative to engine speed. The passing of the gear teeth through the MPU tip (pole) generates a voltage and frequency. This frequency is converted to a speed reference by a control module. It should be noted here that most MPUs will develop similar signals. However, the magnitude and strength of the signal is dependent on the size of the sensor in relation to the gear teeth, the clearance between the pole piece and the gear teeth, and various other factors. As a general rule of thumb, the following standards should be met:①Dimension of tooth top surface should be equal to or more than the pole piece diameter.②Tooth height should be equal to, or more than the space between teeth.③The space between teeth should be approximately three times the pole piece diameter.④Air gap (clearance) between tooth and pole piece should be between 0.015 to 0.030. MPUsnormally have 3/8, 5/8 threads and 2, 3 and 4 lengths. Determining which size is appropriatedepends on the space available for installation, the availability of pre-drilled holes and consideration tothose rules mentioned above. In most cases, these will be the only factors affecting the selcetion of aMPU.MPUs can be used to ____.①sense speed ②supply alarm ③sense direction of rotation.A.①②B.②③C.①③D.①②③
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Which of the following factors will affect the strength and magnitude of the signal?A.The number of the gear toothB.The clearance between the pole pieces.C.The size of the sensor.D.The MPUs thread
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By radar alone, you detect a vessel ahead on a collision course, about 3 miles distant. Your radar plot shows this to be a meeting situation. You should ______.A.turn to portB.turn to starboardC.maintain course and speed and sound the danger signalD.maintain course and speed and sound no signal
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In fog you observe your radar and determine that risk of collision exists with a vessel which is 2 miles off your port bow. You should ______.A.stop your enginesB.sound the danger signal at two-minute intervalsC.hold course and speed until the other vessel is sightedD.take avoiding action as soon as possible
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When comparing DSL broadband to cable broadband, which of the following is an advantage ofDSL broadband?（）A、Upgraded copper lines allow maximum speed greater than cableB、Signal is not shared back to the switchC、Signal is shared back to the switchD、Distance is not a factor in signal speed
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单选题A stand-on vessel is（）.A
required to give way in a crossing situationB
required to sound the first passing signal in a meeting situationC
free to maneuver in any crossing or meeting situation as it has the right-of-wayD
required to maintain course and speed in a crossing situation but may take action to avoid collision
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We are getting alongside NO.1 buoy.B
We are berthing at NO.1 buoy.C
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单选题A vessel hearing a fog signal forward of her beam has not determined if risk of collision exists. She shall reduce speed to（）.A
moderate speedB
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half speedD
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单选题Which signal is recognized as a distress signal?（）.A
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A smoke signal giving off orange colored smokeC
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单选题A RADIO SIGNAL FROM A DISTRESSED VESSEL AUTOMATICALLY DIRECTED TO A RCC GIVING POSITION，IDENTIFICATION，COURSE AND SPEED OF THE VESSEL AS WELL AS THE NATURE OF DISTRESS is known as（）.A
Distress alertB
Safety alertC
Emergency alertD
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单选题When comparing DSL broadband to cable broadband, which of the following is an advantage ofDSL broadband?（）A
Upgraded copper lines allow maximum speed greater than cableB
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Signal is shared back to the switchD
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单选题In fog you observe your radar and determine that risk of collision exists with a vessel which is 2 miles off your port bow. You should（）.A
stop your enginesB
sound the danger signal at two-minute intervalsC
hold course and speed until the other vessel is sightedD
take avoiding action as soon as possible
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单选题Which statement concerning maneuvering in restricted visibility is FALSE?（）.A
A vessel which cannot avoid a close-quarters situation with a vessel forward of her beam shall reduce her speed to bare steeragewayB
A vessel which hears a fog signal forward of her beam shall stop her enginesC
A vessel which hears a fog signal forward of the beam shall navigate with cautionD
If a vessel determines by radar that a close-quarters situation is developing，she shall take avoiding action in ample time
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