c4 151-300

150問 • 2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. Movement of the pump control rack in a fuel injection system having individual plunger-type pumps

•changes the length of the pump stroke

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

201. Which of the following admits air to the piston of a cylinder relay valves in a correct sequence for engine starting?

•Starting Air Distributor

202. A twin-screw, rotary, positive displacement pump is provided with timing gears. If it were possible to change the lead (pitch) of the screws, which of the following statements would represent the true effect on the pump characteristics?

•The shorter the lead, the higher the pressure potential

203. Excessive vibrations created by the main propulsion machinery are detrimental to which equipment listed below-----------?

•navigation

204. How is dissolved oxygen in boiler feed water minimized?

•Maintain high feed water temperature

205. When fuel viscosity in the service tank needs to be reduced before the atomizer, what should be done ?

•increase the heater steam supply

206. What is known as an air motion induced in a four-cycle diesel engine cylinder to improve air fuel mixing?

•Turbulence

207. Dirty condenser in a refrigeration system would indicate ?

•high pressure discharge

208. The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the?

•connecting rod or piston rod

209. What part of an engine transmits the reciprocating motion of the piston to the driven unit in the form of rotary motion?

•crankshaft

210. How is the pressure and temperature affected in a diesel engine cylinder during compression?

•Pressure and temperature increase

211. If condensate is accumulated in the steam side of a fuel oil heater, it could result in ?

•corrosion

212. Why should the boiler fire side be kept free from soot accumulations ?

•soot insulates the boiler heating surfaces

213. What is the use of follow-up gear on an electro-hydraulic steering gear?

•Takes the pump off stroke when the desired rudder angle is attained

214. The most common diesel engine fuel system problems are caused by ?

•dirty fuel

215. When a fuel injection nozzle overheated which of the problems listed below can be expected?

•The fuel metering will vary.

216. An incinerator is a waste disposal unit that will burn ?

•solid material and all types of liquid waste

217. Reduced capacity, vibration and noise at the centrifugal pump suction due to vapor pockets in the fluid being pumped is caused by

•cavitation

218. What will be the result if carbon deposits accomulates in the burner throat and diffuser rings of boiler?

•decrease boiler efficiency

219. Rapid fluctuations of absolute pressure in the last effect of a multi-effect submerged tube distilling, plant will tend to cause ?

•Priming with increased salinity of distillate

220. Why are relief valves of fuel service pump for boiler burners installed ?

•To protect the pump from high discharge pressure

221. Which operating condition of a diesel engine is indicated by excessive firing pressures?

•Overload

222. What will happen if the needle valve in a fuel injection nozzle sticks open ?

•The nozzle will overheat

223. Which of the listed turbocharger component increases air density and helps improve engineoperating efficiency?

•Air cooler

224. In addition to a nozzle, a fuel oil atomizer uses which of the listed parts?

•Burner cone

225. When an engine coupled with the large vibrational shocks that act on the shafts, there could be a permanent damage to the propeller shafts.Why.?

•Because of the intermediate shaft weight

226. What does an unusual or new vibration in the hull or propeller shafting indicate?

•Propeller unbalance

227. What happens when oil is heated up ?

•Its viscosity will increase

228. Schedule of soot blowing for economizers is done for at least ?

•Three times a day

229. Which items on the list could reduce high salinity in a steaming boiler?

•using the continuous blowdown

230. In the water tube boiler, the fire in the furnace is located at the ?

•outside the tubes

231. On a medium pressure, differential piston, reciprocating air compressor, lubrication of the pistons/cylinders is usually accomplished,

•with metering type cylinder lubricators

232. A badly leaking refrigeration compressor discharge valves will cause ?

•constant running of the compressor

233. A change in the degree of fuel atomization in a diesel engine cylinder has the greatest effect on the_ _.?

•combustion in that cylinder

234. Which of the following is the purpose of the diffuser in a burner assembly?

•To shield the flame from the incoming air blast while allowing mixing of fuel and air

235. If the discharge valve is closed before the drive motor is stopped, which type of pump will most likely be damaged?

•Gear pump

236. Diesel engine crankcase oil mist detectors are designed to analyze ?

•the concentration of oil vapours in the crankcase

237. Burned gas from each cylinder is directed to the exhaust manifold which is part of ?

•2-stroke engine

238. When chemical energy of the fuel is converted to thermal energy during boiler operation, the conversion process occurs where ?

•furnace

239. In bunker tanks, which of the following tanks is used in storing fuel ready for immediate use for starting up the diesel engine?

•Sercvice tank

240. The boiler water having a pH reading of 7.0 is said to be ?

•neutral

241. What is a practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine?

•Check the cylinder exhaust temperature frequently,

242. Positive displacement helical gear pumps are well suited for pumping oil because ?

•they are self-priming and produce high suction lift

243. The measured temperature indicates the ?

•level of heat intensity

244. Which of the following components is directly connected to the propellers and lies mainly encased in the stern tube?

•Tail shaft

245. In a mechanical compression refrigerating system, what is the main cause of a very low discharge pressure?

•Insufficient refrigerant in the system

246. In air conditioning system, which part of the system where the refrigerant begins to boil and flash into gas?

•Evaporator

247. Purging air from a hydraulic oil system is necessary when ?

•system has been drained and filled with new oil

248. Regarding the low pressure evaporator steam control orifice in the live steam supply line, the steam at the outlet of the orifice if not properly conditioned will be developed as ?

•superheated steam

249. In a large slow-speed propulsion diesel engine, the force applied to the piston is

•against the crosshead during the power and compression strokes

100

250. Why is it important to apply proper filtering and straining of diesel fuel oil ?

•fuel injectors may be damaged by foreign particles in the fuel oil

c4. 1-150

Gilbert Olido · 150問 · 2年前

c4. 1-150

150問 • 2年前

Gilbert Olido

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. Movement of the pump control rack in a fuel injection system having individual plunger-type pumps

•changes the length of the pump stroke

177. Most fuel injection nozzles are opened by ?

•fuel oil pressure

•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

201. Which of the following admits air to the piston of a cylinder relay valves in a correct sequence for engine starting?

•Starting Air Distributor

•The shorter the lead, the higher the pressure potential

203. Excessive vibrations created by the main propulsion machinery are detrimental to which equipment listed below-----------?

•navigation

204. How is dissolved oxygen in boiler feed water minimized?

•Maintain high feed water temperature

205. When fuel viscosity in the service tank needs to be reduced before the atomizer, what should be done ?

•increase the heater steam supply

206. What is known as an air motion induced in a four-cycle diesel engine cylinder to improve air fuel mixing?

•Turbulence

207. Dirty condenser in a refrigeration system would indicate ?

•high pressure discharge

208. The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the?

•connecting rod or piston rod

209. What part of an engine transmits the reciprocating motion of the piston to the driven unit in the form of rotary motion?

•crankshaft

210. How is the pressure and temperature affected in a diesel engine cylinder during compression?

•Pressure and temperature increase

211. If condensate is accumulated in the steam side of a fuel oil heater, it could result in ?

•corrosion

212. Why should the boiler fire side be kept free from soot accumulations ?

•soot insulates the boiler heating surfaces

213. What is the use of follow-up gear on an electro-hydraulic steering gear?

•Takes the pump off stroke when the desired rudder angle is attained

214. The most common diesel engine fuel system problems are caused by ?

•dirty fuel

215. When a fuel injection nozzle overheated which of the problems listed below can be expected?

•The fuel metering will vary.

216. An incinerator is a waste disposal unit that will burn ?

•solid material and all types of liquid waste

217. Reduced capacity, vibration and noise at the centrifugal pump suction due to vapor pockets in the fluid being pumped is caused by

•cavitation

218. What will be the result if carbon deposits accomulates in the burner throat and diffuser rings of boiler?

•decrease boiler efficiency

219. Rapid fluctuations of absolute pressure in the last effect of a multi-effect submerged tube distilling, plant will tend to cause ?

•Priming with increased salinity of distillate

220. Why are relief valves of fuel service pump for boiler burners installed ?

•To protect the pump from high discharge pressure

221. Which operating condition of a diesel engine is indicated by excessive firing pressures?

•Overload

222. What will happen if the needle valve in a fuel injection nozzle sticks open ?

•The nozzle will overheat

223. Which of the listed turbocharger component increases air density and helps improve engineoperating efficiency?

•Air cooler

224. In addition to a nozzle, a fuel oil atomizer uses which of the listed parts?

•Burner cone

225. When an engine coupled with the large vibrational shocks that act on the shafts, there could be a permanent damage to the propeller shafts.Why.?

•Because of the intermediate shaft weight

226. What does an unusual or new vibration in the hull or propeller shafting indicate?

•Propeller unbalance

227. What happens when oil is heated up ?

•Its viscosity will increase

228. Schedule of soot blowing for economizers is done for at least ?

•Three times a day

229. Which items on the list could reduce high salinity in a steaming boiler?

•using the continuous blowdown

230. In the water tube boiler, the fire in the furnace is located at the ?

•outside the tubes

231. On a medium pressure, differential piston, reciprocating air compressor, lubrication of the pistons/cylinders is usually accomplished,

•with metering type cylinder lubricators

232. A badly leaking refrigeration compressor discharge valves will cause ?

•constant running of the compressor

233. A change in the degree of fuel atomization in a diesel engine cylinder has the greatest effect on the_ _.?

•combustion in that cylinder

234. Which of the following is the purpose of the diffuser in a burner assembly?

•To shield the flame from the incoming air blast while allowing mixing of fuel and air

235. If the discharge valve is closed before the drive motor is stopped, which type of pump will most likely be damaged?

•Gear pump

236. Diesel engine crankcase oil mist detectors are designed to analyze ?

•the concentration of oil vapours in the crankcase

237. Burned gas from each cylinder is directed to the exhaust manifold which is part of ?

•2-stroke engine

238. When chemical energy of the fuel is converted to thermal energy during boiler operation, the conversion process occurs where ?

•furnace

239. In bunker tanks, which of the following tanks is used in storing fuel ready for immediate use for starting up the diesel engine?

•Sercvice tank

240. The boiler water having a pH reading of 7.0 is said to be ?

•neutral

241. What is a practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine?

•Check the cylinder exhaust temperature frequently,

242. Positive displacement helical gear pumps are well suited for pumping oil because ?

•they are self-priming and produce high suction lift

243. The measured temperature indicates the ?

•level of heat intensity

244. Which of the following components is directly connected to the propellers and lies mainly encased in the stern tube?

•Tail shaft

245. In a mechanical compression refrigerating system, what is the main cause of a very low discharge pressure?

•Insufficient refrigerant in the system

246. In air conditioning system, which part of the system where the refrigerant begins to boil and flash into gas?

•Evaporator

247. Purging air from a hydraulic oil system is necessary when ?

•system has been drained and filled with new oil

248. Regarding the low pressure evaporator steam control orifice in the live steam supply line, the steam at the outlet of the orifice if not properly conditioned will be developed as ?

•superheated steam

249. In a large slow-speed propulsion diesel engine, the force applied to the piston is

•against the crosshead during the power and compression strokes

100

250. Why is it important to apply proper filtering and straining of diesel fuel oil ?

•fuel injectors may be damaged by foreign particles in the fuel oil