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Magnetic dip is a measurement of the angle between the ______.
A.geographic pole and the magnetic pole
B.lubber’s line and true north
C.horizontal and the magnetic line of force
D.compass heading and the magnetic heading
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更多 “ Magnetic dip is a measurement of the angle between the ______.A.geographic pole and the magnetic poleB.lubber’s line and true northC.horizontal and the magnetic line of forceD.compass heading and the magnetic heading ” 相关考题
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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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What will be the phase angle relationship of a six-pole, three-phase, rotating field generator?A.60B.120C.180D.360
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The height of eye correction is smaller than geometrical dip because of ______.A.the angle between the horizontal and the line of sight to the visible horizonB.index errorC.parallaxD.terrestrial refraction
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Isogonic lines are lines on a chart indicating ______.A.points of equal variationB.points of zero variationC.the magnetic latitudeD.magnetic dip
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The angle between the flukes and the shank of an anchor is called the ______.A.holding angleB.fleet angleC.fluke angleD.shank angle
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In the navigational triangle，the angle at the elevated pole is the ______．A.meridian angleB.altitudeC.right ascensionD.azimuth angle
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______is an angle at which a cargo settles in the hold of a ship，between the horizontal and the slope made by a bulk cargo such as grain or iron ore．A.Angle of lollB.Angle of inclinationC.Angle of reposeD.Angle of list
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Deviation is the angle between the ______.A.true meridian and the axis of the compass cardB.true meridian and the magnetic meridianC.magnetic meridian and the axis of the compass cardD.axis of the compass card and the degaussing meridian
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Magnetic compass deviation______．A.varies depending upon the bearing usedB.is the angular difference between magnetic north and compass northC.is published on the compass rose on most nautical chartsD.is the angular difference between geographic and magnetic meridians
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单选题The angle between the flukes and the shank of an anchor is called the（）.A
holding angleB
fleet angleC
fluke angleD
shank angle
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单选题The fluke angle of an anchor system is the angle between the（）.A
flukes and the shankB
shank and the sea bottomC
mooring line and the sea bottomD
flukes and the shackle
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单选题Isogonic lines are lines on a chart indicating （）.A
points of equal variationB
points of zero variationC
the magnetic latitudeD
magnetic dip
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单选题Deviation is the angle between the（）.A
true meridian and the axis of the compass cardB
true meridian and the magnetic meridianC
magnetic meridian and the axis of the compass cardD
axis of the compass card and the degaussing meridian
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单选题The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is（）.A
deviationB
variationC
compass errorD
dip
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单选题The height of eye correction is smaller than geometrical dip because of （）.A
the angle between the horizontal and the line of sight to the visible horizonB
index errorC
parallaxD
terrestrial refraction
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单选题In the navigational triangle，the angle at the elevated pole is the（）.A
meridian angleB
altitudeC
right ascensionD
azimuth angle
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单选题Magnetic dip is a measurement of the angle between the（）.A
geographic pole and the magnetic poleB
lubber's line and true northC
horizontal and the magnetic line of forceD
compass heading and the magnetic heading
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单选题Variation is the angular measurement between（）.A
compass north and magnetic northB
compass north and true northC
magnetic meridian and the geographic meridianD
your vessel's heading and the magnetic meridian
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单选题The principal purpose of magnetic compass adjustment is to（）.A
reduce the variation as much as possibleB
reduce the deviation as much as possibleC
reduce the magnetic dip as much as possibleD
allow the compass bowl to swing freely on its gimbals
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单选题The angle at the pole measured through 180°from the prime meridian to the meridian of a point is known as（）.A
the departureB
the polar arcC
longitudeD
Greenwich hour angle
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单选题What will be the phase angle relationship of a six-pole, three-phase, rotating field generator （）.A
60B
120C
180D
360
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单选题The line which connects the points of zero magnetic dip is（）.A
An agonic lineB
The magnetic equatorC
A magnetic meridianD
All of the above
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单选题The angle measured at the observer’s meridian from the elevated pole，clockwise or counterclockwise up to 180°，to the vertical circle of the body is the（）.A
local hour angleB
azimuth angleC
meridian angleD
longitude
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单选题The vertical angle between the horizontal and the magnetic line of force is the（）.A
elevationB
magnetic angleC
vertical angleD
dip
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单选题When relieving the helm，the new helmsman should know the（）.A
Course per magnetic steering compassB
Gyro errorC
VariationD
Maximum rudder angle previously used
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单选题Magnetic compass deviation（）.A
varies depending upon the bearing usedB
is the angular difference between magnetic north and compass northC
is published on the compass rose on most nautical chartsD
is the angular difference between geographic and magnetic meridians
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单选题The points on the earth’s surface where the magnetic dip is 90° are（）.A
Along the magnetic equatorB
Connected by the isoclinal lineC
The isoporsD
The magnetic poles
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