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

A、AC

B、DC

C、generator

D、fresh water generator

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更多“Current changing in direction and rising and falling in value is （）.”相关的问题

第1题

[单选题] Inductance is the property of an electric circuit that （）

A、opposes any change in the applied voltage B、opposes any change in the current flow through the circuit C、aids any changes in the applied voltage D、aids any changes in the current through the circuit

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第2题

[单选题] A swift current occurring in a narrow passage connecting two large bodies of water，which is produced by the continuously changing difference in height of tide at the two ends of the passage，is called a（）.

A、hydraulic current B、rectilinear current C、rotary current D、harmonic current

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第3题

[单选题] A swift current occurring in a narrow passage connecting two large bodies of water which is produced by the continuously changing difference in height of tide at the two ends of the passage is called a(n)（）.

A、hydraulic current B、rectilinear current C、rotary current D、harmonic current

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第4题

[单选题] Capacitance is the property of an electric circuit opposing a change in the （）

A、current in the circuit B、voltage in the circuit C、inductance in the circuit D、resistance in the circuit

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第5题

[单选题] The type of current which will have the greatest effect on the course made good for your vessel is（）.

A、one flowing in the same direction as your course steered B、one flowing in the opposite direction as your course steered C、one that flows at nearly right angles to your course steered D、a rotary current in which the direction of current flow constantly changes

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第6题

[单选题] Which of the following statements is correct regarding an oil with a high viscosity index?（）

A、A large change of viscosity occurs with a minor change in temperature B、No change in viscosity occurs with any change in temperature C、Very little change in viscosity occurs with a significant change in temperature D、The viscosity of the oil increases with an increase in temperature

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第7题

[单选题] Current refers to the（）.

A、vertical movement of the water B、horizontal movement of the water C、density changes in the water D、None of the above

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第8题

[单选题] Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions?（）

A、Current and voltage may be in phase B、Current may lead the voltage C、Current may lag the voltage D、All of the above

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第9题

[单选题] The purpose of the commutator and brushes on a DC generator is to（）

A、change AC to DCcurrent B、change DC to AC current C、neutralize a armature reaction D、carry current to the outside circuit