单选题The radar control that reduces weak echoes out to a limited distance from the ship is the（）.Asensitivity time control (sea-clutter control)Breceiver gain controlCbrilliance controlDfast time constant (differentiator)
单选题
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 control
C
brilliance control
D
fast time constant (differentiator)
参考解析
解析：
暂无解析
相关考题：
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 controlC.brilliance controlD.fast time constant (differentiator)
What is the purpose of the radar reflector?__________.A.Making objects less visibleB.Making echoes weaker on the radarC.Making large echoes smailerD.Making small objects better visible
Moisture absorbed in the winding or condensed on the surface of electrical machinery nsulation A.is good for long term preserving since most insulation is organic and contains some amountB.lowers the insulation value and is a common cause of fault grounds in idle machinesC.will enhance insulation resistance only if it is no saltD.reduces the amount of current supplied or drawn by the machine so horsepower is limited
You have another ship overtaking you close aboard to starboard．You have 3 radar targets bearing 090° relative at ranges of 0.5 mile，1 mile，and 1.5 miles．In this case，the unwanted echoes are called ______．A.Multiple echoesB.SpokingC.Indirect echoesD.Side-lobe echoes
Your radar is set on a true motion display．Which of the following will NOT appear to move across the PPI scope ________．A.Echoes from a buoyB.Own ship's markerC.Echo from a ship on the same course at the same speedD.Echo from a ship on a reciprocal course at the same speed
In order to insure that the racon signal is visible on your 3 cm radar, the ______.A.10 cm radar should be placed on stangby or turned offB.gain control should be turned to maximumC.radar should be stabilized, head upD.rain clutter control should be off but, if necessary, may be on low
The policemen acted quickly because lives were at stake.A:in dangerB:in difficultyC:in despairD:out of control
Change control within information technology（IT）systems is a formal process used to ensure that changes to product or system are introduced in a controlled and coordinated manner.It（74）the possibility that unnecessary changes will be introduced to a systeA.AddsB.RemovesC.ProducesD.Reduces
Which two statements are correct about the signaling methods that are utilized for transmitting voice？ （）A、 Channel-associated signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.B、 Channel-associated signaling utilizes a separate TDM channel for transmitting control signals.C、 Common channel signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.D、 Common channel signaling uses one of the TDM channels to transmit control information reducing the number of channels available for voice.E、 ISDN BRIs implement channel-associated signaling.
单选题According to paragraph 2, some organizations check their systems to find out ______.Awhether there is any weak pointBwhat sort of data has been stolenCwho is responsible for the leakageDhow the potential spies can be located
单选题The radar control used to reduce sea return at close ranges is the（）.Again controlBsensitivity time controlCfast time constantDpulse length control
单选题You are underway in thick fog. You have not determined if risk of collision exists. Which statement is TRUE?（）.AYour speed must be reduced to bare steeragewayBA look-out is not required if the radar is onCFog signals are only required when a vessel is detected by radarDThe radar should always be kept on a short-range scale
单选题When you turn on the fast time constant (differentiator) control of a radar it will（）.Aenhance weak target echoes and brighten them on the PPIBreduce clutter over the entire PPI by shortening the echoesConly suppress weak targets to a limited distance from the ship (sea clutter)Dreduce the beam width to provide a map-like presentation for navigation
单选题Your radar displays your ship off center．As you proceed on your course， your ship’s marker moves on the PPI scope while echoes from land masses remain stationary.What is this display called（）.AOff centerBTrue motionCStabilizedDHead up
单选题The radar control that shortens all echoes on the display and reduces clutter caused by rain or snow is the（）.Asensitivity time control (sea clutter control)Breceiver gain controlCbrilliance controlDfast time constant (differentiator)
单选题When using the ARPA in heavy rain，which action should you take? （）AIncrease the radar gain to pick up weak echoes through the rainBIncrease the STC setting to reduce close-in spurious signalsCNavigate as though the effective range of the radar has been reducedDIncrease the range of the inner and outer guard rings
单选题In order to find out which lifeboat you are assigned, you should look at the （）.ACertificate of InspectionBStation BillCShips ArticlesDFire Control Plan
多选题Which two statements are correct about the signaling methods that are utilized for transmitting voice？ （）AChannel-associated signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.BChannel-associated signaling utilizes a separate TDM channel for transmitting control signals.CCommon channel signaling transmits control signals in band and therefore reduces the bandwidth available for the voice data stream.DCommon channel signaling uses one of the TDM channels to transmit control information reducing the number of channels available for voice.EISDN BRIs implement channel-associated signaling.
单选题Your ARPA has been tracking a target and has generated the targets course and speed.The radar did not receive a target echo on its last two scans due to the weather.What should you expect under these circumstances（）.AThe ARPA will generate data as if the target was still being tracked by radarBThe ARPA will give an audible and/or visual lost target alarmCThe ARPA will generate data based on sea return echoes from the vicinity where the target was lostDThe ARPA has lost all memory of the target and must recompute the target data
问答题It's also a safe way for children to experience for themselves how a lie usually goes out of control.
单选题An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes?（）.ATheir bearing is almost constant，even when the true bearing of the contact changes appreciablyBThey always appear on a bearing of 90°from the true bearing of the contactCThe indirect echoes usually appear in shadow sectorsDWhen plotted，their movements are usually abnormal
单选题You are underway in thick fog.You have not determined if risk of collision exists.Which statement is true?（）AYour speed must be reduced to bare steerage waysBA look-out is not required if the radar is onCThe radar should always be kept on a short-range scaleDFog signals are only required when a vessel is detected by radar
单选题If there is any doubt as to the proper operation of a radar，which statement is TRUE?（）.AOnly a radar expert can determine if the radar is operatingBAll radars have indicator lights and alarms to signal improper operationCA radar range compared to the actual range of a known object can be used to check the operation of the radarDThe radar resolution detector must be energized to check the radar
单选题The writer suggests that policy makers should consider cultural values ______.Ain carrying out family planningBin producing birth control drugsCin improving public health standardsDin introducing birth control techniques
单选题When navigating in thick fog with the radar on，you should（）.Astation the look-out in the wheelhouse to keep a continuous watch on the radarBsecure the sounding of fog signals until a vessel closes within five milesCstation a look-out as low down and far forward as possibleDkeep the radar on the shortest available range for early detection of approaching vessels