三副航海英语习题讲解3教学文稿.doc
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1、三副航海英语习题讲解3精品资料2017航海英语复习三Key word 10: Radar and ARPA(60)A335. Radar makes it possible and much safer for us to sail _.A. in dense fog B. in boisterous weather C. in the open sea D. in rivers【知识点】雷达的使用【解析】主要作用:雾航B380. Radar makes the most accurate determination of the _.A. direction of a target B. d
2、istance to a target C. size of a target D. shape of a target【知识点】雷达的使用【解析】雷达测距最准确。相关题目A382. Without doubt the radar is a highly important navigation aid. But duty officer shall aware that _when using it.A. Its range reading is more accurate than its bearing readingB. A low-lying coastline with a lon
3、g, flat beach will show up properly on the radar.C. Radar is only aimed at collision avoidance.D. the use of radar is necessary only when visibility is restricted、D527. Radar is not only to obtain _, but also to measure their distance away from you.A. brightness of objects B. color of targets C. sha
4、pe of targets D. bearing of objectsD361. Which statement concerning the operation of radar in fog is TURE ?A. radar ranges are less accurate in fog B. navigation buoys will always show up on radarC. a sandy beach will show up clearer on radar than a rocky cliffD. small wooden boats may not show up o
5、n radarB327. The correct method of switching off a marine radar is to turn power switch to _ position first, then to _ position.A. off / standby B. standby / off C. standby / close D. close / standby【知识点】雷达的使用【解析】雷达关机步骤。B606、As the radar antenna scans through _ a rotation , it can be show where the
6、target is relative to your position .A. 60 degree B. 360 degree C. 180 degree D. 90 degree【知识点】雷达的使用【解析】雷达天线。A345. The radar control that reduces weak echoes out to a limited distance from the ship is the _A. sensitivity time control ( sea-clutter control) B. receiver gain controlC. brilliance contr
7、ol D. fast time constant ( differentiator )【知识点】雷达的使用(控钮)【解析】近距离的杂波相关题目D346. The radar control that shortens all echoes on the display and reduces clutter caused by rain or snow is the _. A. sensitivity time control (sea clutter control) B. receiver gain control C. brilliance control D. fast time co
8、nstant (differentiator)D372. _is on the panel of radar. A.KEYLOCK B.REPEATER C.STATIC INVERTER D.ANTI-CLUTTER-SEAA391. What is the purpose of VRM control?A. To measure distance accurately B. To measure bearing accuratelyC. To measure range and bearing D. To adjust radar monitor【知识点】雷达的使用【解析】活动距标圈。D5
9、57. SWEEP INT on radar panel is the abbreviation of_Asweep introduction Bsweep interest Csweep intention Dsweep intensity【知识点】雷达的使用【解析】扫描亮度A605、When will you have to adjust gain ?A. every time you change ranges B. each watch C. every day D. every week【知识点】雷达的使用【解析】增益:每次改变量程后需重新调整。D352. When hitting
10、a solid object such as a ship or an airplane, the radar waves are reflected back _ they came.A. in the way B. the way C. by the way D. through the path【知识点】雷达的工作原理【解析】雷达波路径B360. Which general statement concerning radar is FALSE?A. raising the antenna height increases the radar range B. the ability o
11、f radar to detect objects is unaffected by weather conditionsC. radar bearing are less accurate than radar rangeD. radar should be checked regularly during clear weather to ensure that it is operating properly 【知识点】雷达的工作原理【解析】雷达探测物标的能力会受到天气的影响。A348. The radio waves used for radar are very short,only
12、 _ longAa few centimeters Ba few fathoms Ca few meters Da few feet【知识点】雷达技术指标(波长)【解析】航海雷达主要是3cm和10cmC336. The 10-cm radar as compared to a 3-cm radar of similar specifications will _.A. be more suitable for river and harbor navigationB. provide better range performance on low lying targets during go
13、od weather and calm seasC. have a wider horizontal beam width D. have more sea return during rough sea conditions【知识点】雷达技术指标(波长)【解析】1)最大作用距离:正常天气下,3cm雷达的大;雨雪天,10cm雷达的大。 2)距离分辨力和测距精度:波长短,脉冲前沿短,脉冲宽度短3cm好。3)方位分辨力和测方位精度:波长越短,波束宽度越窄3cm好。4)抗杂波能力:10cm好。相关题目D337. The 3-cm radar as compared to a 10-cm radar
14、with similar specifications will _.A. give better range performance in rain, hail, etc.B. display small targets in a mass of dense sea clutter at a greater rangeC. have less sea return in choppy rough seasD. display a more maplike presentation for inshore navigationA364. Coral atolls, or a chain of
15、islands at right angles to the radar beam, may show as a long line rather than as individual targets due to _.A. the effects of beam width B. limitations on range resolutionC. the pulse length of the radar D. the multiple-target resolution factor【知识点】雷达技术指标(天线波束宽度)【解析】天线水平波束宽度对方位分辨力的影响。A 237. You ar
16、e using radar in which your own ship is shown at the center, and the heading flash always points to 00. If bearings are measured in relation to the flash, _ bearing are produced. A. relative B. true C. compass D. a circle appearing on the scope surrounding the light【知识点】雷达显示方式【解析】首向上显示方式B331. You ha
17、ve been observing your radar screen and notice that a contact on the screen has remained in the same position, relative to you, for several minutes. Your vessel is making 10 knots through the water. Which statement is TRUE?A. The contact is dead in the waterB. The contact is on the same course and s
18、peed as your vesselC. The contact is on a reciprocal course at the same speed as your vesselD. The radar is showing false echoes and is probably defective【知识点】雷达显示方式【解析】相对运动相关题目C374. A radar contact will remain stationary on a relative motion radar display only when it is _.A. on the same course as
19、your vessel B. at the same speed as your vesselC. on the same course and speed as your vesselD. on a reciprocal course at the same speed as your vesselD363. You are underway at 5 knots and see on your radar a contact 10 miles directly astern of you. 12 minutes latter, the contact is 8 miles directly
20、 astern of you. What is the estimated speed of the contact? A. dead in the water B. 1 knot C. 10 knots D. 15 knots【知识点】雷达显示方式【解析】相对运动:d=(V2-V1)tC353. When using a radar in a unstabilized mode, fixes are determined most easily from _.A. center bearings B. tangent bearings C. ranges D. objects that ar
21、e close aboard【知识点】雷达显示方式【解析】不稳定显示方式首向上,航向变,方位变。B375. A radar display in which North is always at the top of the screen is a(n) _.A. unstabilized display B. stabilized display C. composition display D. relative display【知识点】雷达显示方式【解析】北向上稳定显示方式。相关题目C376. A radar display which is oriented,(标定方向) so tha
22、t north is always at the top of the screen, is called a(n)_A. relative display B. composite display C. stabilized display D. unstabilized displayC392. What course should be fed into a stabilized radar picture?A. Compass course B. Gyro course C. True course D. Course made good【知识点】雷达显示方式【解析】稳定显示方式:使用
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