To increase the frequency of an operating AC generator, you should （）

相似题目

• Prior to closing the breaker when paralleling two AC generators, the recommended practice is to have the frequency of the incoming machine （）

  A . slightly less than the line frequency B . the same as the line frequency C . slightly greater than the line frequency D . All of the above

  查看最佳答案

• If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies，which frequency should you call on? （）

  A . Calling frequency B . Distress frequency C . Urgency frequency D . Working frequency

  查看最佳答案

• When it is accepted to remain on the frequency indicated，you should say（）.

  A . Standing by on VHF frequency B . Coming to VHF frequency C . VHF frequency. is the best place for you to stay by D . remaining in frequency. and do not change

  查看最佳答案

• Increasing the speed of a centrifugal pump will result in an increase in its capacity in its capacityAnother means of increasing the capacity pump is to increase the（）

  A . diameter of the discharge piping, with all other factors remaining the same B . diameter of the suction piping, with all other factors remaining the same C . width of the impeller only D . diameter of the impeller

  查看最佳答案

• To increase the distance to the vessel ahead by reducing one’s own speed means（）.

  A . fall back B . keep low speed C . running after D . drop back

  查看最佳答案

• When anchored，increasing the scope of the anchor chain normally serves to（）.

  A . prevent fouling of the anchor B . decrease swing of the vessel C . prevent dragging of the anchor D . reduce strain on the windla

  查看最佳答案

• If keep the fuel injection of main engine unchanged when ship is fouled, that will causeⅠ.The speed of main engine to be reduced Ⅱ.Ship speed to be reduced Ⅲ.The resistance torque of propeller to be increased Ⅳ.Trim at stern to increase（）

  A . Ⅰ + Ⅱ B . Ⅰ ~ Ⅲ C . Ⅰ ~ Ⅳ D . Ⅰ + Ⅱ + Ⅳ

  查看最佳答案

• When underway and proceeding ahead，as the speed increases，the pivot point tends to（）.

  A . move aft B . move forward C . move lower D . remain stationary

  查看最佳答案

• You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow directionThis indicates that the frequency of the incoming machine is （）.

  A . higher than the bus frequency B . lower than the bus freouencv C . the same as the bus frequency but out of phase with it D . the same as the bus frequency, and the circuit breaker may be closed at any pointer positio

  查看最佳答案

• The frequency 518KHZ will be used to transmit（）and（）wanings in NAVTEX.

  A . navigational / typhoon B . traffic / meteorological C . marine / hurricane D . navigational / meteorological

  查看最佳答案

• 63. Due to increased costs for materials used in our manufacturing process, we have to increase the wholesale price of our products.

  查看最佳答案

• The volume of trade has increased tremendously to the advantage of both countries.

  查看最佳答案

• Hearing is the ability to detect _______ and performed by ____. The human ear can only be sensitive in the range of frequency of ___ Hz. to ___ Hz.

  查看最佳答案

• (9) Unemployment has become an increasing problem in the recent past.What factors contribute to an increase in unemployment and what steps can be taken to solve the problem?

  查看最佳答案

• The highest frequency of a signal is ,sampling angular frequency is , , in order to avoid aliasing when sampling this signal, what pre-processing is required before sampling （）

  A．quantization B．denoising C．modulation D．anti-aliasingfiltering

  查看最佳答案

• The number of United States citizens who are eligible to vote continues to increase.

  A．encouraged B．enforced C．expected D．entitled

  查看最佳答案

• which of the following helped to increase the population of australia significantly？

  A. The World War II. B. The gold rush. C. The minimum wage. D. The long wool boom.

  查看最佳答案

• 43 The increase in the U. S. Life expectancy is mostly due to

  A declining death rates from heart disease. cancer and stroke. B increasing life expectancy rates in some other countries. C a rise in the rate of chronic disease. D a declining birth rate.

  查看最佳答案

• A fund manager would like to estimate the probability of a daily loss higher than 5% on the fund he manages. He decides to use a method that uses the relative frequency of occurrence based onhistorica

  A、Subjective probability. B、A priori probability. C、Empirical probability.

  查看最佳答案

• If an increase prices increases total revenue in the short run, what will it do to total revenue in the long run？

  A．Itwilldecreasetotalrevenueinthelongrun． B．Itwillincreasetotalrevenueinthelongrun． C．Itwillleavetotalrevenueunchangedinthelongrun． D．Anyoftheaboveresultsarepossibleinthelongrun．

  查看最佳答案

• The mechanism of increased PaCO2 to stimulate respiratory center is mainly due to（）

  A．CO2 directly stimulates the central chemoreceptor in the medulla oblongata B．CO2 increases H+ concentration in cerebrospinal fluid, which stimulates the central chemoreceptor in the medulla oblongata C．H+ stimulates chemoreceptor of the carotid body D．CO2 stimulates chemoreceptor of the carotid body E．CO2 stimulates chemoreceptor of the aortic body

  查看最佳答案

• The pilot increased the altitude of the airplane in order to avoid the rain clouds（）

  A．number B．speed C．weight D．height

  查看最佳答案

• Which of the following would lead to an increase in the vapor pressure of a liquid I. Increasing the temperature II. Adding a nonvolatile

  A．I only B．II only C．Both I and II D．Neither I nor II

  查看最佳答案

• To increase an expense account, the account has to be credited.（)

  此题为判断题(对，错)。

  查看最佳答案