题目内容

During UMS rounds, a duty engineer notices that the fuel oil overflow observation glass is

A. Stop all F.O. transfers immediately, and inform the chief engineer.
B. Make a sounding of the F.O. overflow tank and decide if there is enough capacity to leave it until the following morning.
Call a motorman and have him sound the F.O. overflow tank periodically during the night.
D. start the F.O. purifier

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美联储通过改变________用货币政策影响总需求。

A. 联邦基金率和准备金量
B. 税率影响可支配收入
C. 准备金量来决定政府的支出
D. 政府支出来影响预算平衡
E. 利息收入的税率来影响可支配收入

第二组：Magnetic pickup (MPU) sensors are devices which can be used in conjunction with electronic control modules for monitoring of parameters such as speed, direction of rotation and a variety of alarm conditions. MPU sensors are available in various sizes and types. Following are some guidelines for their selection on industrial engines. MPUs are located near a flywheel, camshaft or other type of gear with rotation relative to engine speed. The passing of the gear teeth through the MPU tip (pole) generates a voltage and frequency. This frequency is converted to a speed reference by a control module. It should be noted here that most MPUs will develop similar signals. However, the magnitude and strength of the signal is dependent on the size of the sensor in relation to the gear teeth, the clearance between the pole piece and the gear teeth, and various other factors. As a general rule of thumb, the following standards should be met:
①Dimension of tooth top surface should be equal to or more than the pole piece diameter.
②Tooth height should be equal to, or more than the space between teeth.
③The space between teeth should be approximately three times the pole piece diameter.
④Air gap (clearance) between tooth and pole piece should be between 0.015" to 0.030". MPUs
normally have 3/8", 5/8" threads and 2", 3" and 4" lengths. Determining which size is appropriate
depends on the space available for installation, the availability of pre-drilled holes and consideration to
those rules mentioned above. In most cases, these will be the only factors affecting the selcetion of a
MPU.
MPUs can be used to ____.①sense speed ②supply alarm ③sense direction of rotation.

A. ①②
B. ②③
C. ①③
D. ①②③

when do you have call the chief engineer to the engine room ？

how to operate incinerator ？ what kind of garbage can not be thrown into incinerator ？