Laser-doppler radar is especiallyvaluable in space missions because__________．

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• Which general statement concerning radar is FALSE?（）.

  A . Raising the antenna height increases the radar range B . The ability of radar to detect objects is unaffected by weather conditions C . Radar bearings are less accurate than radar ranges D . Radar should be checked regularly during clear weather to ensure that it is operating properly

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• Which statement is true concerning a vessel equipped with operational radar?（）.

  A . The Master of the vessel must be on the bridge when the radar is in use B . The radar equipment is only required to be used in restricted visibility C . The use of a radar excuses a vessel from the need of a look-out D . This equipment must be used to obtain early warning of risk of collisio

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• SWEEP INT on radar panel is the abbreviation of（）.

  A . sweep introduction B . sweep interest C . sweep intention D . sweep intensity

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• Radar is not only to obtain（），but also to measure their distance away from you.

  A . brightness of objects B . color of targets C . shape of targets D . bearing of object

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• The bridge is fitted（）two radars.

  A . before B . on C . from D . with

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• The radar control used to reduce sea return at close ranges is the（）.

  A、Gain control B、Sensitivity time control C、Fast time constant D、Pulse length control

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• Radar is not only to obtain（）,but also to measure their distance away from you.

  A . brightness of obtain B . color of targets C . shape of targets D . bearing of object

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• 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

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• The fog is lifted，so（）the radar．

  A . close B . open C . switch off D . switch o

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• Radar is used to not only to look（）,but also to measure their distances away from you.

  A . at obscured objects B . forward submerged targets C . up exposed targets D . for unseen object

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• A radar contact will remain stationary on a relative motion radar display only when it is（）.

  A . on the same course as your vessel B . at the same speed as your vessel C . on the same course and speed as your vessel D . on a reciprocal course at the same speed as your vessel

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• The fog is too thick. Don’t（）the radar.

  A . switch on B . switch off C . close D . ope

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• （）is on the panel of radar.

  A、KEYLOCK B、REPEATER C、STATIC INVERTER D、ANTI-CLUTTER-SEA

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• A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.

  A . relative display B . composite display C . stabilized display D . unstabilized display

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• The microsecond unit of time is used in radar applications. The microsecond represents which of the following?（）.

  A . one-millionth part of a second B . one-thousandth part of a second C . one-hundredth part of a second D . one-tenth part of a second

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• Radar bandwidth is normally（）to the range scale and the associated pulse length.

  A . fixed B . matched C . fitted D . equal

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• My radar is not working.I require shore based radar assistance.Is shore based radar assistance（）?

  A . used B . available C . in use D . can be used

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• （）is not a job of the radar antenna.

  A . To receive the high-frequency pulses from the transmitter B . To focus the pulses into a beam，and send them into space C . To pick up reflected pulses coming from objects that have been struck by the beam D . To reflect microwave

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• In radar plotting C.P.A.is the abbreviation of（）.

  A . closest point to approach B . close point to approach C . crossing point to approch D . coming point to approach

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• To determine if risk of collision exists，a vessel which is fitted with radar must use（）.

  A . radar scanning B . radar plotting C . compass bearings D . All of the above

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• 7. If there is any doubt as to the proper operation of a radar, which statement is TRUE?

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• The bridge is fitted________ two radars.

  A.before B.with C.from D.on

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• In radar plotting C.P.A is the abbreviation of ______.

  A.crossing point to approach B.fog or steady rain C.closest point to approach D.close point to approach

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