A direct current passing through a wire coiled around a soft iron core is the description of a simple（）.

相似题目

• The velocity of the wind，its steady direction，and the amount of time it has blown determines a wind driven current’s（）.

  A . temperature B . density C . deflection D . speed

  查看最佳答案

• On a clear，warm day，you notice the approach of a tall cumulus cloud. The cloud top has hard well defined edges and rain is falling from the dark lower edge. Should this cloud pass directly overhead（）.

  A . it will be preceded by a sudden increase in wind speed B . it will be preceded by a sudden decrease in wind speed C . the wind speed will not change as it passes D . the wind will back rapidly to left in a counterclockwise direction as it passe

  查看最佳答案

• Current flowing in only one direction is called （）

  A . alternating current B . omnidirectional current C . direct current D . sinusoidal current

  查看最佳答案

• The Humboldt Current flows in which direction?（）

  A . North B . South C . East D . West

  查看最佳答案

• FLOATING，CAUSED BY WINDS AND CURRENT WITH A DETERMINABLE DIRECTION defines（）.

  A . Floating B . Sailing C . Drifting D . Running into danger

  查看最佳答案

• Britain’s climate is influenced by（）,a warm ocean current that passes the western coast of the British Isles and warms them.

  A . the North Atlantic Drift B . the Brazil Current C . the Labrador Current D . the Falkland Current

  查看最佳答案

• The current flowing first in one direction and then in another is called（） current.

  A . an alternating B . a rush C . a direct D . an exciting

  查看最佳答案

• Which current would you encounter on a direct passage from London，England，to Capetown，South Africa（）.

  A . Falkland Current B . Brazil Current C . Norway Current D . Benguela Current

  查看最佳答案

• Current changing in direction and rising and falling in value is （）.

  A . AC B . DC C . generator D . fresh water generator

  查看最佳答案

• If the current and wind are in opposite directions，the sea surface represents（）.

  A . a greatly reduced wind speed B . a higher wind speed than what really exists C . a lower wind speed than what really exists D . more turbulent wind

  查看最佳答案

• In an alternating current electrical system, a low system power factor is a direct sign of （）

  A . wasted energy B . efficient operation C . a short in the exciter field windings D . an excessive number of minor system ground

  查看最佳答案

• A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles is approximately（）.

  A . 3 hours B . 6 1/2 hours C . 12 1/2 hours D . 25 hour

  查看最佳答案

• If the current and wind are in the same direction，the sea surface represents a wind speed （）.

  A . lower than actually exists B . higher than actually exists C . that actually exists D . that has no proportional relationshi

  查看最佳答案

• A current will develop between areas of different density in ocean waters. If you face in the same direction the current is flowing，the water of（）.

  A . high density will be on the left in the Northern Hemisphere B . high density will be on the right in the Southern Hemisphere C . low density will be on the left in the Northern Hemisphere D . low density will be on the left in the Southern Hemisphere

  查看最佳答案

• Which of the following components are used to convert alternating current produced in the generator windings to direct current?（）

  A . Armature and equalizer B . Commutator and brushes C . Rotor and interpoles D . Field and exciter

  查看最佳答案

• The function of direct current regulated power supply is to input an alternating current power of 220volts, so that it can output __________.

  查看最佳答案

• We define : V D is the voltagebetween P terminal and N terminal, ID is the current passing through the diode,and it’s direction is from P to N. if >0 and>0, the diode is in the ( ) region

  查看最佳答案

• 157. _______ contains details of weather, currents and ice hazards appropriate to the routes, and it links the volumes of Sailing Directions.

  查看最佳答案

• 81. FLOATING CAUSED BY WINDS AND CURRENT WITH A DETERMINABLE DIRECTION defines _____.

  查看最佳答案

• He said current interest rates are a direct ______ of domestic （国内的) and inter-national

  He said current interest rates are a direct ______ of domestic (国内的) and inter-national conditions. A．affect B．effect C．income D．outcome

  查看最佳答案

• Currents are________in rate and direction.

  A.vary B.variable C.variably D.variability

  查看最佳答案

• - A-t-elle passé ses vacances chez ses parents ？ - Oui, elle les a chez ses parents.

  查看最佳答案

• When a position is temporary and it doesn’t worth the trouble to recruit externally for the position, a company could then offer to pay bonuses of various types to current employees and entice them in

  A．headhunting B．employee referral C．inside moonlighting D．campus recruiting

  查看最佳答案

• —I’m still looking for a topic for my assignment. And I don’t want to do too much research. —___ _ choosing a current issue There is a lot happening in the region at present.

  A．How about B．Should you C．Couldn’t you

  查看最佳答案