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【单项选择题】

When the current flow through a copper wire increases, its （）

A、A.resistance will decrease

B、B.insulation will bum

C、C.temperature will increase

D、D.conductivity will increase

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更多“When the current flow through a copper wire increases, its （）”相关的问题

第1题

[] The easiest way to anchor a vessel in a current is to（）.

A、A.stem the current and make very slow headway when the anchor is dropped B、B.stem the current and be falling aft very slowly when the anchor is dropped C、C.stem the current and endeavor to make neither headway nor sternway when the anchor is dropped D、D.stop all headway through the water and keep the current astern when the anchor is dropped

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第2题

[单选题] When the current in a power transmission line is increased, the power loss （）

A、increases as the square of the current B、decreases as the square root of the current C、remains the same, as it is independent of current flow D、increases in direct proportion as the current

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第3题

[单选题] A vessel is tide rode when it is（）.

A、carrying extra rudder to compensate for the current B、necessary to adjust the course steered to allow for the current C、at anchor and stemming the current D、being forced off of a pier by the hydraulic effect of the current

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第4题

[单选题] When picking up your mooring at the buoy，the correct method is to（）.

A、approach the buoy with the wind and current astern B、approach the buoy with the wind and current ahead C、approach the buoy with wind and sea abeam D、stop upwind and up current and drift down on the buoy

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第5题

[单选题] Which statement about stopping a vessel is TRUE?（）

A、A lightly laden vessel requires as much stopping distance as a fully laden vessel when the current is from astern B、A vessel is dead in the water when the back wash from astern operation reaches the bow C、A tunnel bow thruster can be used in an emergency to reduce the stopping distance D、When a vessel is dead in the water any speed displayed by doppler log reflects the current

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第6题

[单选题] When steering a tow downstream around the shape of a sand bar，and staying on the proper side of the buoys，an operator should be cautious of（）.

A、eddies under the bar B、swift current under the bar causing loss of control C、cross-currents pushing the tow away from the bar D、cross-currents pushing the tow into the bar

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第7题

[单选题] The lockmaster has given you permission to tie off on the lower guide wall to wait your turn to lock through. What should you be most concerned with? （）

A、A downbound vessel B、An upbound vessel C、Current reaction when the lock chamber is being emptied D、Current reaction when the lock chamber is being filled

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第8题

[单选题] The best time to work a boat into a slip is（）.

A、when the wind is against you B、with the current setting against you C、at slack water D、with a cross current

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第9题

[单选题] All the following is true except that（）.

A、in many places a counter current flows in opposition to the main current close to the bank B、current can vary with depth of water and large deep draught ships can experience different current effects at differing parts of the hull tend to turn to the wind C、as speed is reduced，the increased proportion of the ship's vector which is attributable to current will set the ship close to obstructions D、when close to the berth in a head current，there is a danger that flow inshore of the ship becomes restricted and the ship is subject to interactive forces

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第10题

[单选题] A “Mediterranean moor” should be used when（）.

A、when anchoring in the Mediterranean B、when docking stern to a berth C、when docking bow to a berth D、when anchoring in a strong current

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