首页
题目
TAGS
首页
/
题库
/
[单选题]The frequency of an 的答案
搜答案
The frequency of an alternator at a given r/min is determined by the _______ .
单选题
2021-12-31 19:27
A、number of turns of wire in the armature coil
B、number of magnetic poles
C、strength of the magnets used
D、output voltage
查看答案
正确答案
B
试题解析
标签:
感兴趣题目
A bank opens an L/C at the request of the importer. It is a (an)().
At an angle of loll,the capsizing moment is().
The transmission time duration of a single pulse of radio-frequency energy is a function of the().
Although a given waveform may contain frequencies over a very broad range, as a practical matter any transmission system will be able to accommodate only a limited band of (1) . This, in turn, limits the data rate that can be carried on the transmission (2) . A square wave has an infinite number of frequency components and hence an infinite (3) .However, the peak amplitude of the kth frequency component, kf, is only 1/k, so most of the (4) in this waveform is in the first few frequency components. In general, any digital waveform will have (5) bandwidth. If we attempt to transmit this waveform as a signal over any medium, the transmission system will limit the bandwidth that can be transmitted.
() is provided to alternators, in the event of prime mover failure to ensure that the alternator does not act as a motor.
It is assumed that students at an intermediate level will have a good()of the basic structures and vocabulary of English.
A seaman has a small,gaping laceration of the arm that is not bleeding excessively. What can be done as an alternative to suturing to close the wound?()
One factor that determines the frequency of an alternator is the().
An alternator switchboard has a synchroscope and synchronizing lamps, if the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus ()
If the dispersion of a given fiber is 17ps/nm*km at 1550 nm and zero at 1310 nm, then what is the accumulated dispersion of an ITU wavelength after it travels 200 km?()
Sequential circuit is a common logic device whose output values, at a given instant, depend upon its input values and the internal state at that instant, and whose internal state depends upon the(66)preceding input values and the preceding internal state. A sequential circuit can assume a finite number of internal states and may therefore be regarded, from an abstract(67), as a finite(68).Combinational circuit is another logic device whose output values, at any given instant, depend upon the input values at that instant. A combinational circuit is a(69)of a sequential circuit whose internal state is not taken(70).
The frequency of an AC generator is adjusted by means of the ()
相关题目
When the changing of a VHF channel / frequency is accepted,say().
Frequency is the reciprocal of the period, if the period is 4ms, then the frequency would be ().
The pressure head of a pump is given in the unit of ().
The direction a vessel is pointed at any given time is the().
The pressure head of a water pump is given in the unit of ().
The correct meaning of a lexical item in a given context is__.
The frequency of an alternator at a given r/min is determined by the _______ .
The holding power of an anchor at a given scope of cable increases when the().
The frequency of an AC generator is controlled by the ()
In an alternating current electrical system, a low system power factor is a direct sign of ()
The viscosity of an oil is a measure of its ().
The flood stream here is at an average rate of 0.8().
A fire is discovered in the forepeak of a vessel at sea. The wind is from ahead at 35 knots. You should().
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as _______.
In information theory, "information" is regarded as knowledge which reduces or removes(71) about the occurrence of a specific event from a given set of possible events. The concept "event" is to be understood as used in the theory of probability. For instance, an event may be the occurrence of a(72) character or word in a given message or in a given position of a message.In communication theory, channel is defined as that part of a communication system that connects the message source with the message sink. An encoder may be inserted between the message source and the input to the channel, and a(73) between the output of the channel and the message sink. Generally, these two units are not considered as being parts of the channel. In certain cases, however, they may be considered as pans of the message source and message sink,(74) In information theory(75) to Shannon, the channel can be characterized by the set of conditional probabilities of occurrence of all the messages received at the message sink when a given message emanates from the message source.
A line connecting all possible positions of your vessel at any given time is a().
A notice of readiness is not valid unless it indicates that the vessel is ready to load or discharge as the case may be,at the time()it is given.
The amount of moisture in a given sample of air, when compared with the amount of moisture the air could hold if totally saturated at the existing temperature of the sample, is called ().
Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.()
广告位招租WX:84302438
题库考试答案搜索网
免费的网站请分享给朋友吧