competence 4.4

50問 • 1年前

問題一覧

151. What is the possible cause of fuel oil accumulation in boiler casing is ?

•dripping atomizers

152. Gas turbine uses a cycle that includes intake, compression, expansion and exhaust. Which of the following are you going to use to best explain the complete cycle.

•Pressure volume diagram

153. Which of the following determines the measured gap between the face of the burner atomizer tip nut and the dfifuser plate ?

•Distance piece

154. Most of the fuel injection pumps will then closed after injection because they are fitted with a ?

•spring loaded discharge check valve

155. Why is thin tipping design procedure is used in modern reaction turbines ?.

•reduce tip leakage

156. In a refrigeration system, the amount of superheat absorbed by the refrigerant is adjusted at the

•expansion valve

157. If turbine rotor shafts extend through the casing, what external source of sealing steam is used in conjunction with labrynith packing ?.

•seal the casing during periods of low casing pressure

158. Labyrinth seals used to reduce leakage around a turbine shaft are constructed of

•machined packing strips or fins

159. Visual inspection of a fuel injector valve, removed during overhaul, shows heat discoloration of the lower end of the valve. This is an indication of

•valve leakage

160. An internally mixed steam atomizer requires which of the following compared to a return flow oil burner system?

•Less excess air

161. What is the reason why fuel is heated before atomizing is to ?

•decrease its viscosity

162. Which of the listed conditions is responsible for causing the gland leak off steam from a propulsion turbine to pass through the gland exhaust condenser?

•The use of a gland exhauster fan

163. Parts of the pump used to maintain the alignment of the pump are ?

•bearings

164. A squeaking sound occurring from within an operating reciprocating air compressor is an indication of ?

•tight compressor bearings

165. The function of seal cages, or lantern rings installed in the centrifugal pump stuffing boxes, is to

•distribute the sealing liquid within the stuffing box

166. An oil mist detector is used to detect an oil mist formation in the diesel engine crankcase. Which of the following causes oil mist formation ?

•overheating of Oil

167. The bore of a diesel engine describes the ?

•AA diameter of the cylinder

168. How is constant steam pressure maintained?

•By controlling the amount of heat supplied to the boiler

169. How will you know the firing rate of boiler using steam atomization indicated?

•By the fuel oil pressure

170. Which of the following is the result of excessively high fuel oil temperature ?

•Fouling of the heaters

171. Which equipment must be tested NOT more than 12 hours prior to getting underway from a port when the voyage is to be of 48 hours or greater duration?

•Steering gear

172. In the boilerás combustion control system, when the demand for steam is increased

•air supply increases before fuel supply increases

173. The purpose of the diffuser in a boiler burner assembly is to

•allow some mixing of fuel and air

174. What is the purpose of the dehydrator in refrigeration?

•Remove refrigerant moisture

175. Main component of the engine to regulate speed is the ?

•governor

176. The high pressure side of the refrigeration system starts from the?

•compressor to the expansion valve

177. Most fuel injection nozzles are opened by ?

•fuel oil pressure

178. 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

179. Boiler safety valves are set not to go above maximum operating pressure of higher than ?.

•0.1

180. Why should hydraulic cranes be properly warmed-up before they are used?

•Hydraulic fluid must be at the proper viscosity

181. In a main propulsion turbine installation, the condensate pump initially discharges to the

•air ejector condenser

182. If a reciprocating air compressor has a knock occurring in frequency with its operating RPM, the cause is probably

•misalignment or worn main bearings

183. The range of values around a set point of a measured variable where "no action"occurs in an automatic flow controller is called:

•Deadband

184. Passages are drilled at the diesel engine crankshaft in order to provide lubricating oil in the ?.

•piston rod bearings

185. If you hear a crackling sound coming from a salt water centrifugal pump casing, the most probable cause of the noise would be ?

•excessive suction lift

186. The capacity of a rotary pump, delivering a constant viscosity fluid, will decrease when the discharge pressure is increased, due to ?

•increased slippage

187. The measure of the amount of salt present in water is called ?

•Salinity Specific Gravity.

188. Which of the following statement is correct when a piston is said to be at top dead center?

•nearest to the cylinder head

189. The purpose of the six-way valve used in an electro-hydraulic steering system is to,

•redirect hydraulic fluid flow when changing over pumps

190. Main engine lube oil sump tank is located ?

•at the bottom of the engine

191. What is the most important rule for the safe operation of a boiler?

•Maintain the proper water level at all times

192. When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to.

•seal the casing during periods of low casing pressure

193. Why diesel engine lubricating oil need more purification compare with the lubricating oil in a gas turbine?

•gas turbine lubricant does not come into contact with the combustion process

194. Which of the following is the reason for installing settling tanks in the fuel oil system?

•To heat, allowing sediments and water to settle down

195. Why is it necessary to transfer fuel oil to the settling tanks ?

•allow the sediments and water to settle

196. Part of centrifugal disc purifier use to hold discs in place and directs the flow of dirty liquid to the bottom then to the discs as the oil flows upward is called

•distributor

197. Which of the items listed below is normally describe a ventilating fan?

•Axial flow

198. Which of the following terms is used to identify the pressure of the liquid ?

•Suction head

199. If you were operating a centrifugal water service pump with worn wearing rings, the

•pump would develop insufficient flow

200. Irregular feeding or surging of the feedwater supply to a low pressure distilling plant may be attributed to

•A dirty strainer in the saltwater feed pump suction line

competence 4.1

ERNO ENRIQUE JOMENTO · 50問 · 1年前

competence 4.1