competence 4.3

ERNO ENRIQUE JOMENTO · 3回閲覧 · 50問 · 1年前

通報

問題一覧

101. Air leaking into a flash type distilling plant could occur through

•gasketed joints, valve stem, and gage glass packing

102. A salinity indicating system functions on the basic principle of measuring the

•electrical conductivity of water

103. To keep the movement of the rudder closely in step with the steering wheel, which of the devices listed, when used on an electro-hydraulic steering gear?

• The follow-up gear.

104. The capacity of a rotary pump, when operated at a constant speed, will decrease with an increase in the pump?

•rotor clearances

105. Fluctuations in the pressure and temperature of the steam supplied to the first-effect of a low pressure submerged tube distilling plant will cause

•pressure and temperature fluctuations in the entire unit

106. The temperature of the refrigerant in the evaporator coil defends mostly upon the

•refrigerant pressure in the evaporator

107. Which combination of the main shaft segments listed below, that are located furthest from the main engine are connected by the inboard stern tube shaft coupling?

•Line shaft and stern tube shaft

108. A distorted spray pattern from a fuel injector can cause a diesel engine to have ?

•less power output

109. which of the following is the direction of the recirculating valve of a boiler return flow of fuel system when firing a cold boiler

•Fuel direct back to the suction valve of the service pump

110. What is the importance of the control box of a differential gear system in a steering gear system?.

•it conpares the bridge signal to the actual rudder angle through the follow up gear

111. Which of the following component is the primary shaft emerging out of the engine. It directly receives the rotational motion from the crankshaft and rotates at the maximum velocity in high-speed engines.

• Thrust shaft

112. The firing rate of boiler using steam atomization is indicated by the ?

•fuel oil supply pressure

113. Which of the following cases listed below should soot blowing be applied to avoid soot fires ?

•Prior to an increase in power

114. What is the use of a steam control valves installed in the auxiliary exhaust line?

•Control steam admission and maintain the proper steam spray pattern in the DC heater

115. If the flow of water from the centrifugal pump is allowed to be stopped by closing the discharge valve while the pump continues to run for an extended period, which of the following will occur?

•liquid in the pump will overheat

116. What is the characteristic of a one ton air conditioning system?

•Its cooling power equals melting 907 kg.(2000 lbs) of ice per day.

117. The dehydrator of a refrigeration system is located ?

•before expansion valve

118. Cylinder oil is used for ?

•2-stroke engine

119. The average pressure exerted on a piston during each power stroke is termed

•mean effective pressure

120. Strainer is commonly used in hydraulic system in order to ?

•prevent solid particles from entering the pump.

121. The working principle of an engine is the conversion of ?

•heat into mechanical energy,

122. The function of a centrifugal pump double volute casing is to ?

•reduce radial thrust on the impeller

123. Distortion of the spray pattern of a nozzle or injector maybe indicated by alan ?

•cooling water temperature rise

124. What precaution should be observed to prevent damage of the service pump when warming up the fuel system to the boiler is to ?

•close the recirculating valve when atomizing temperature is reached

125. Which of vthe following is the primary purpose of heaters in a pressurized fuel oil system?

•reduce the fuel viscosity for proper atomization

126. Which of the following would result if the temperature of the fuel to the burners is too low?

•The boiler will produce heavy black smoke

127. Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to ?

•remove condensation and other liquids from the cylinders

128. If the fixed orifice in the evaporator steam supply line were to be removed, the steam pressure reducing valve located upstream would

•be unable to maintain steam flow unless the proper range spring were to be installed

129. What action would you take to perform the most important rule for the safe operation of a boiler?

•Maintain the proper water level at all times

130. How do you control freshwater heating temperature in the evaporator side of a Fresh Water Generator?

•Regulate outlet valve

131. Inspection of a low pressure gear pump for cavitation will usually be indicated by a wear pattern ?

•along the inlet side of the housing

132. Integral water jacket liners use O-rings near the bottom of the liner. These O-rings serve to ?

•prevent the escape of lubricating oil from the crankcase

133. What part of the boiler provides water circulation to the waterwall tubes?

•Downcomers

134. One of the routine tasks onboard maintenance for Gas Turbine is mainly of daily visual checks of the running engine. What are you going to execute after a fix number of operating hours to remove any salt deposits on the compressor?

•Internal water wash

135. What causes carbon deposits in the fuel heater?

•high fuel temperature,

136. What is the cause of excessively low air pressure occurring in the intercooler of a reciprocating air compressor?

•leaky discharge valves on the LP cylinder

137. While overhauling a jerk-type pump and the pump plunger must be replaced. What other part must also be replaced?

•Pump barrel

138. During injection, the cam nose of the camshaft will push up the plunger of the pump, forcing the fuel to the ?

•fuel injector

139. Increasing the speed of a centrifugal pump will result in an increase in the pump capacity. Another means of increasing the total head pressure of a centrifugal pump is to increase the ?

•diameter of the impeller

140. Which of the following component is the primary shaft emerging out of the engine?lt directly receives the rotational motion from the crankshaft and rotates at the maximum velocity in high speed engines.

•thrust shaft

141. The greatest decrease in the temperature of a refrigerant is at the

•expansion valve.

142. How does a quick closing valve operate?

•the valve bridge is collapse remotely allowing the valve to close

143. If the boiler fires are extinguished by water contamination in the fuel oil, you should FIRST?

•secure the burner valves

144. How is viscosity of fuel in the atomizer can be reduced ?

•increasing the fuel oil heater steam supply

145. In an engine operation what is the effect called that describes the unstable operation of the governor that will not maintain a steady state condition ?

•Hunting

146. The possible cause why lube oil pumps fail to build up discharge pressure could be that the ?

•suction valve is closed

147. Which of the following statement is correct relative to distillation plant operation?

•Distillation is the process of boiling seawater to produce vapor which is condensed into fresh Water

148. How many fuel oil heaters are required for main engine operation ?

•at least two heaters of approximately equal size are to be installed

149. Some engines are using auxiliary electrically driven blowers which is continuously running during maneuvering and automatically cut-off if the scavenge air pressure reaches load.

•50%

150. What type of pump is used in the steering gear of modern ship?

•Vane

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