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

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.

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

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

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

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

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

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

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

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

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

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?

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

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

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

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 ?

167. The bore of a diesel engine describes the ?

168. How is constant steam pressure maintained?

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

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

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?

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

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

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

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

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

177. Most fuel injection nozzles are opened by ?

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?

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

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

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

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

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

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

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

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

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

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

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

190. Main engine lube oil sump tank is located ?

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

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

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

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

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

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

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

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

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

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

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

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?

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

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

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

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

207. Dirty condenser in a refrigeration system would indicate ?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.?

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

227. What happens when oil is heated up ?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

243. The measured temperature indicates the ?

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

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

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

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

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 ?

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

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