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单选题 Which of the following descriptions of the echo sounder is false

A. The echo sounder is used to determine the depth of the sea floor

B. Echo sounders rely on the same principles that radar and ultrasound utilize

C. An echo sounder is a safety device which can alert a ship to dangerous changes in the level of the sea floor

D. The flow of current interferes the reading of an echo sounder most

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时间：2026-05-17 03:37:24

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题目1
单选题
The "Mode"selector switch on the autopilot steering stand is used to select any of the following with the EXCEPTION of( )
A. automatic pilot steeringB. hand-electric steeringC. non-follow-up steeringD. rudder adjustment
题目2
单选题
When steering by autopilot, how often should manual steering be checked
A. Every dayB. When tine allowsC. At least once a watchD. NO checking is necessary
题目3
单选题
While steering by autopilot you notice that the vessel has deviated 12 degrees from course and there is no corrective rudder being applied.As a standard operating procedure you should first
A. check the setting of the rudder adjustmentB. check the setting of the weather adjustmentC. switch to hand steeringD. immediately engage the trick wheel
题目4
单选题
If the mode switch is in the "HAND" position, ( ) can be done with the steering handle at any time
A. follow-up steeringB. non-follow-up steeringC. automatic steeringD. remote control steering
题目5
单选题
Rudder position is show on the bridge by the( )
A. Rapson side indicatorB. Follow upC. Rudder angle indicatorD. Telemotor position
题目6
单选题
All echo-sounders can measure the
A. actual depth of waterB. actual depth of water below keelC. average depth from waterline to hard bottomD. average depth of water to soft bottom
题目7
单选题
What may affect the accuracy of sounding with echo sounder
A. Sea bottomB. Ship's speedC. Speed of currentD. Water temperature and density
题目8
单选题
sends a radio signal from the bottom of the ship to the sea-bed, from which it is reflected
A. The marine sextantB. The chronometerC. The echo sounderD. The radar
题目9
单选题
Which one should be preset for echo sounder in order to avoid grounding
A. GainB. RangeC. FrequencyD. Shallow alarm
题目10
单选题
Which of the following descriptions of the echo sounder is false
A. The echo sounder is used to determine the depth of the sea floorB. Echo sounders rely on the same principles that radar and ultrasound utilizeC. An echo sounder is a safety device which can alert a ship to dangerous changes in the level of the sea floorD. The flow of current interferes the reading of an echo sounder most
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