competence 6.3

46問 • 1年前

問題一覧

101. Depending upon the design of boiler, the constant pressure maintained at the steam drum or the superheat outlet is known as?

•Operating pressure

102. What utilizes a pure transducer utilizes?

•proportion action

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.

104. What methods are used to control the time that current is limited before full currentis applied ?

•Wye-delta starter

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

106. What is the description in the source voltage in a parallel circuit?

•Is inversely proportional to each branch current.

107. How can you determine if a circuit breaker is tripped?

•Examining the position of the handle.

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

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

110. What do you call a directional lighting to emphasize an object or draw atteention to a part of the field view

•accept lighting

111. Which of the following statements is true concerning a polyphase synchronous propulsion motor?

•The motor is started as an induction motor.

112. To be considered as High Volatge system used on board a ship, how much should be the minimum voltage?

•1,000V

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

114. Which of the following statement will affect he capacity value of a capacitor ?

•the flow of current in the circuit

115. Which prevents the entry of large objects to the pipeline and safeguards the internal parts of the pumps?

•Mud Box

116. What is the part of a transformer which function is to deliver the load received?

•secondary winding

117. Re-circulating of the feed water ensures a flow of water through?

•Main feed pump

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.

119. The dielectric strength of transformer oil is expected to be

•33kV

120. The capacitance is measured in ?

•farads

121. A low-voltage protection circuit is used in electric motor starting equipment to

•prevent the motor from restarting automatically on restoration of voltage

122. The speed of a series wound winch motor is controlled by:

•varying the voltage applied to the motor

123. The type of permanent magnets are normally made of ?

•alnico alloy.

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

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

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

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

128. For a galley equipment the molded case breaker that provide protection against short circuits uses a/an________?

•electromagnet

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

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

131. Prior to starting an AC Generator prime mover, the voltage regulator cut out switch should be placed to what position?

•Manual

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

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

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

136. What might be the cause if an electric motor of an electric driven compressor fails to start?

•Tripped circuit breaker

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

137. Which of the following is not provided in a switchboard for an AC electrical distribution system?

•transducer

138. The purpose of checking the electrical installations, equipments, etc. using a megger tester?

•Load to carry.

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

140. In process control terminology values which can change without distinct increments, such as temperature, pressure or level are called

•analog values

141. In a cross-compound main propolsion unit, the astern turbine is usually INSTALLED WHERE

•Low pressure end of the low pressure turbine

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

143. Identify factor that determines the frequency of an alternator?

•number of magnetic poles

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

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

146. Which of the following statements represents an application of a silicon controlled rectifier ?

•Not synchronized, current is flowing and the relays are closed

MPLE

ユーザ名非公開 · 41問 · 13日前

MPLE