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問題一覧
1
102. What utilizes a pure transducer utilizes?
•proportion action
2
120. The capacitance is measured in ?
•farads
3
121. A low-voltage protection circuit is used in electric motor starting equipment to
•prevent the motor from restarting automatically on restoration of voltage
4
145. Pt100 is a type of resistance temperature dependent sensor, mostly applied if very accurate temperature reading is required. What does Pt100 mean?
•Platinum element with a resistance of 100 ohm @ 0 degc
5
138. The purpose of checking the electrical installations, equipments, etc. using a megger tester?
•Load to carry.
6
130. What is the direction of the magnetic field in a conductor when current is flowing?
•in a direction determined by the left hand rule
7
108. The type of feature afforded to auxiliaries vital to the operation of propelling equipment, where automatic restart after a voltage failure would not create a hazard, which of the following termed is used to describe the process?
•low voltage release
8
134. Prior to starting an AC generator prime mover, the voltage regulator cut out switch should be placed in which of the following position?
•Position to manual
9
107. How can you determine if a circuit breaker is tripped?
•Examining the position of the handle.
10
144. What is known as a conduction carrier opposite to the majority current carrier which are represented by the holes in N-Type material and free electrons in a P-Type material?
• Minority Current Carrier
11
129. Which one of the following best describes the meaning of the term atrackinga when applied to high voltage electrical systems?
•It is a current that flows within insulation layers
12
128. For a galley equipment the molded case breaker that provide protection against short circuits uses a/an________?
•electromagnet
13
113. In a simple DC circuit, the resistance is held constant when the applied voltage is halved. Current flows therefore will
•be devided by two
14
142. When trouble shooting electronic equipment, the first step to be taken before testing the circuit voltage is to
•check the voltage supply from the power source
15
125. Determine the main difference of marine high voltage installaqtion compared to low voltage installation onboardship.
•High voltage systems are usually earthed neutral and use current limiting resistors
16
146. Which of the following statements represents an application of a silicon controlled rectifier ?
•Not synchronized, current is flowing and the relays are closed
17
104. What methods are used to control the time that current is limited before full currentis applied ?
•Wye-delta starter
18
118. Which of the listed actions should be taken first if one trips out mechanically in two paralleled alternators that are operating near rated load?
•Strip the board of all nonvital circuits.
19
115. Which prevents the entry of large objects to the pipeline and safeguards the internal parts of the pumps?
•Mud Box
20
126. When troubleshooting an electronic circuit, a cold solder joint can be located with the aid of an ohmmeter. Once the problem has been located, what should you do next?
•reheat connection with a soldering tool and recheck with an ohmmeter
21
114. Which of the following statement will affect he capacity value of a capacitor ?
•the flow of current in the circuit
22
122. The speed of a series wound winch motor is controlled by:
•varying the voltage applied to the motor
23
141. In a cross-compound main propolsion unit, the astern turbine is usually INSTALLED WHERE
•Low pressure end of the low pressure turbine
24
139. Which of the following high-voltage testing tools are necessary to test the arc suppression medium in contact cylinders of high-voltage circuit breakers and high-voltage contactors?
•Integrity testers
25
123. The type of permanent magnets are normally made of ?
•alnico alloy.
26
135. Why is it necessary to measure bolted bus bar joint resistance?
•Bacause as high current flows through the bus bar, any resistance in it causes resistive heating
27
132. When paralleling two alternators, the synchronizing lamps remain lit as the synchroscope pointer approaches the 0° position. This indicates the ?
•synchroscope is defective or broken
28
111. Which of the following statements is true concerning a polyphase synchronous propulsion motor?
•The motor is started as an induction motor.
29
117. Re-circulating of the feed water ensures a flow of water through?
•Main feed pump
30
105. What is a kind of temperature detecting element formed by a pair of dissimilar metals joined at one end and elsewhere isolated electrically from each other which produces a small electrical signal?
•Thermocouple
31
116. What is the part of a transformer which function is to deliver the load received?
•secondary winding
32
136. What might be the cause if an electric motor of an electric driven compressor fails to start?
•Tripped circuit breaker
33
103. The total heating surface of any steam generating unit is comprised of?
•Those parts of boiler which are exposed on one side to only water or steam being heated, and on the other side to the combustion gases.
34
101. Depending upon the design of boiler, the constant pressure maintained at the steam drum or the superheat outlet is known as?
•Operating pressure
35
133. Which one of the following is best described as the combinations of electrical disconnect switches and circuit breakers that are used to control, protect and isolate high-voltage electrical equipment ?
•Switchgear
36
137. Which of the following is not provided in a switchboard for an AC electrical distribution system?
•transducer
37
127. The ground indicating light on the main electrical switchboard is indicating a ground. The best procedure for locating gounded circu
•Open the circuit breakers on the distribution panel, one at a time until the light no longer indicate a ground
38
143. Identify factor that determines the frequency of an alternator?
•number of magnetic poles
39
131. Prior to starting an AC Generator prime mover, the voltage regulator cut out switch should be placed to what position?
•Manual
40
110. What do you call a directional lighting to emphasize an object or draw atteention to a part of the field view
•accept lighting
41
109. Which of the following is required onboard, to perform before any work on a high voltage equipment commences to ensure that any stored electrical energy in the inherent capacitance of the equipment insulation is safely discharge after isolation?
•Earthing
42
106. What is the description in the source voltage in a parallel circuit?
•Is inversely proportional to each branch current.
43
119. The dielectric strength of transformer oil is expected to be
•33kV
44
140. In process control terminology values which can change without distinct increments, such as temperature, pressure or level are called
•analog values
45
112. To be considered as High Volatge system used on board a ship, how much should be the minimum voltage?
•1,000V
46
124. The speed of a squirrel-cage , multi-sspeed induction motor, as used aboardship, is best varrried by changing the
•Number of connected poles in the stator