轮机英语题库 柴油机常识

106. The projection on a shaft designed to change circular motion into up and down or back and fore motion is called_____.

A. ring

B. wheel

C. gear

D. cam

107. The four-stroke cycle begins with the piston_____.

A. coming up from the BDC

B. coming up from the TDC

C. coming down from the BDC

D. coming down from the TDC

108. The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speed. In maintaining this relationship, the camshaft drive causes the camshaft to rotate at_____.

A. one-half crankshaft speed in a two-stroke cycle diesel engine

B. crankshaft speed in a two-stroke cycle diesel engine

C. two times crankshaft speed in a two-stroke cycle diesel engine

D. one-fourth times crankshaft speed in a four-stroke cycle diesel engine

109. The purpose of the skirt or trunk in four-stroke cycle engines is to act in a similar manner to a_____.

A. crosshead

B. crown

C. piston rod

D. connecting rod

110. The oil sump, a light welded design, is mounted on the engine block from below and sealed by_____.

A. O-ring

B. gasket

C. washer

D. packing

111. Top piston rings are plasma coated. It gives added safety for the _____of new liners.

A. running-in

B. running-out

C. running- on

D. running-down

112. Around the combustion chamber, all the main components are _____to give low thermal strains and the smallest, circumferentially-symmetric deformations for good sealing between piston rings and liner.

A. drill cooled

B. hole cooled

C. tube cooled

D. bore cooled

113. Around the combustion chamber, all the main components are bore cooled to give low _____strains and the smallest, circumferentially-symmetric deformations for good sealing between piston rings and liner.

A. thermal

B. mechanical

C. plastic

D. elastic

114. The cylinder covers are secured by eight elastic holding-down _____arranged in four pairs.

A. nuts

B. screws

C. studs

D. flanges

115. The four-stroke cycle is so called because it takes _____to complete the processes needed to convert the energy in the fuel into work.

A. two strokes of the piston

B. four strokes of the piston

C. one revolution of the crankshaft

D. four revolutions of the crankshaft

116. In the suction stroke, the crankshaft is rotating clockwise and the piston moving _____the cylinder, the inlet valve is _____and a fresh charge of air is being drawn or pushed into the cylinder by the turbocharger.

A. up, opened

B. down, opened

C. up, closed

D. down, closed

117. It is during_ ____that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.

A. the suction stroke

B. the compression stroke

C. the expansion stroke

D. the exhaust stroke

118. Pressurized air enters the cylinder via the inlet ports and pushes the remaining exhaust gas

from the cylinder in a process known as_____.

A. charging

B. supercharging

C. scavenging

D. exhausting

119. The bedplate must be rigid enough to support the weight of the rest of the engine, and maintain the crankshaft, which sits in the bearing housing in the_____, in alignment.

A. longitudinal girders

B. transverse girders

C. fore girders

D. aft girders

120. Basically the bedplate consists of two_____, which run the length of the engine.

A. longitudinal girders

B. transverse girders

C. fore girders

D. aft girders

121. The A-frames carry the crosshead guides and support the engine_____.

A. foundation

B. seating

C. entablature

D. bedplate

122. Because the tie bolts are so close to the crankshaft, some engines employ _____to hold the crankshaft main bearing cap in position instead of conventional studs and nuts.

A. through bolts

B. jack bolts

C. tap bolts

D. fitted bolts

123. The crankshafts on the large modern 2-stroke crosshead engines are _____big _____makes as

a single unit and so are constructed by joining together individual forgings.

A. enough, to

B. too, to

C. such, to

D. so, that

124. The crankpins and journals were machined and matching holes bored in the webs, which were slightly _____in diameter.

A. smaller

B. larger

C. higher

D. lower

125. Today, crankshafts for larger 2-stroke crosshead engines are of the _____ type.

A. semi-built

B. built-up

C. solid forged

D. individual forged

126. The _____of the semi-built method of the construction crankshaft is that by making the two webs and crankpin from a single forging the grain flow in the steel follows the webs round into the crankpin and back down the other web.

A. advantages

B. disadvantages

C. power advantages

D. power disadvantages 127. The connecting rod is fitted between the crosshead and the crankshaft. It transmits the firing force, and together with the crankshaft convert the _____motion into _____a motion.

A. rotary, reciprocating

B. up and down, fore and aft

C. fore and aft, up and down

D. up and down, rotary

128. The slippers run _____in the crosshead guides the piston and rod are _____and prevent the top of the connecting rod from moving sideways.

A. up and down, reciprocating

B. up and down, rotating

C. back and forth, reciprocating

D. back and forth. Rotating

129. Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches the mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, _____to a maximum as the piston approaches to or bottom dead center and then _____back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.

A. accelerates, decelerates

B. accelerates, accelerates

C. decelerates, decelerates

D. decelerates, accelerates

130. The load on the crosshead pin is always_____, so it is the _____half of the bearing which is subject to wear.

A. upwards, top

B. upwards, bottom

C. downwards, top

D. downwards, bottom 131. Because of the resulting higher pressure in the cylinder from the combustion of this greater mass of fuel, and the larger diameters, the liner must be made _____at the top to

accommodate the higher stresses, and prevent cracking of the material.

A. thinner

B. thicker

C. smoother

D. rougher

132. Cylinder liners from older lower powered engines had a uniform wall thickness and the cooling was achieved by circulating cooling water through a space formed between_____.

A. crown and skirt

B. liner and jacket

C. ring and groove

D. jacket and block 133. For a fire to begin there must be present a combustible material, oxygen or air to _____ combustion, and a source of heat at a temperature high enough to start combustion.

A. begin

B. support

C. last

D. extinguish

134. The diesel engine is similar to the gasoline engine in that_____.

A. both of them are ignited by compressed air

B. both of them are the forms of external combustion engines

C. both of them have spark plugs

D. the power is developed by the piston in the cylinder

135. The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is_____.

A. they operate between 150 and 450 r/min

B. they are connected to the propeller by gearing

C. their smaller size and weight

D. they can be connected directly to the propeller without gearing

136. Gas turbines differ from steam turbines in that_____.

A. steam rather than gas is used to turn the shaft

B. vapor rather than gas is used to turn the shaft

C. the former uses gas to turn the shaft

D. the latter uses gas to turn the shaft

137. Precision engine bearing inserts are manufactured with a small portion of the bearing ends extending beyond the bearing housing or caps. The installation process of these bearings requires sufficient_____.

A. overlap

B. crush

C. lap or lead

D. protrusion

138. The lower section of a piston is called the_____.

A. land

B. skirt

C. crown

D. plate

139. A diesel engine which is rated for normal operation at a crankshaft speed of 800r/min is commonly classed as a_____.

A. slow- speed diesel

B. medium-speed diesel

C. high-speed diesel

D. constant-speed diesel

140. If the bedplate was too rigid, then as the hull flexed, the_____, which secure the engine into the ship would be likely to break, and there would be danger of the bedplate cracking.

A. through bolts

B. jack bolts

C. holding down bolts

D. tap bolts

141. The trend nowadays is to build the frame box as a separate fabricated construction and then, after stress relieving and machining the mating surfaces, to mount it on the_____. This has the advantage of saving weight.

A. seating

B. bedplate

C. entablature

D. cylinder block

142. Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?

A. The expansion tank should be topped off.

B. The thermostatic water regulating valves should be manually opened.

C. The fuel filters should be changed.

D. The engine should be turned over slowly with indicator cocks open.

143. For any piston ring to operate smoothly without scuffing, the ring must be_____.

A. of a material harder than the cylinder liner

B. properly lubricated

C. prevented from compressing

D. prevented from rotating during engine operation

144. The reversing cams of some four-stroke/cycle diesel engine are brought into position by_____.

A. sliding the camshaft along its axis

B. rotating the cam 180

C. rotating the cam follower180

D. moving the idler sprockets in the drive chain

145. The shape of a cam on a diesel engine determines the valve’s_____.

A. point of opening

B. speed of opening

C. lift from its seat

D. All of the above 146. The lowest temperature at which fuel combustion becomes self-sustaining in the presence of

a source of ignition is defined as the_____.

A auto-ignition point B. flash point C. burning temperature D. fire point

147. Cast iron pistons used in large propulsion diesel engines are constructed with_____.

A. not taper what so ever

B. the skirt being tapered and smaller than the crown

C. the skirt being tapered and large than the crown

D. the crown being tapered and smaller than the skirt

148. The upper section of a piston is called the_____.

A. land

B. skirt

C. crown

D. plate

149. Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?

A. To allow for greater expansion due to higher operating temperature.

B. To seal the cylinder against leakage of combustion gases.

C. To provide an additional surface for oil cooling.

D. To provide an additional strength for the crown and lower structure.

150. Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as_____.

A. supercharging

B. scavenging

C. turbulence

D. swept volume charging

151. Ring groove inserts are occasionally used on aluminum alloy piston to_____.

A. reduce the ring groove wear rate

B. seal against crankcase vapors

C. lessen the wear on aluminum part of the cylinder

D. allow for the greater expansion rate of aluminum

152. What is the function of an engine’s stationary parts?

A. To add power to the engine

B. To keep the engine firmly attached to its supporting base

C. To keep moving engine part in the proper relative positions.

D. To rotate the crankshaft

153. The two strokes of a two-stroke/cycle diesel engine are_____.

A. power and intake

B. intake and exhaust

C. exhaust and compression

D. compression and power

154. Fuel is ignited in a diesel engine cylinder by_____.

A. a spark plug

B. injectors

C. the heat of compression

D. increasing jacket water temperatures

155. The efficient burning of fuel in a diesel engine is dependent upon the_____.

A. temperature of compression

B. atomization of the fuel

C. penetration of the fuel

D. All of the above

156. The blower type crankcase ventilation system_____.

A. removes combustible gases in the crankcase

B. prevents the formation of combustible gases in the crankcase

C. cools lubricating oil

D. improves cold weather starting

157. What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?

A. Spark plug

B. Heat of compression

C. Carburetor

D. Glow plug

158. What is commonly used to create turbulence in a diesel engine combustion system?

A. Shape of the piston crowns

B. Increasing the compression ratios

C. Increasing the piston crowns

D. Increasing the turbocharger gear ratio

159. The purpose of compressing the air within the cylinder of a diesel engine is to_____.

A. produce the heat for ignition

B. decrease injection lag

C. increase ignition delay

D. aid in exhausting burnt gases

160. The primary purpose of oil control rings on a diesel piston is to_____.

A. provide a reservoir for cylinder lubrication

B. pump oil into the combustion space for cylinder cooling

C. prevent excessive lubricating oil consumption

D. allow hydraulic oil film formation on the cylinder

161. Turbulence is created in the cylinders of a diesel engine to_____.

A. obtain injection lag

B. help mix fuel and air

C. increase combustion pressure

D. utilize higher injection pressures

162. The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the_____.

A. method of supplying air

B. cooling system

C. method of igniting fuel

D. valve operating mechanism

163. How are the pressure and temperature affected in a diesel engine cylinder during compression?

A. Pressure and temperature decrease.

B. Pressure and temperature increase.

C. Pressure decreases and temperature increases.

D. Pressure increases and temperature decreases.

164. If the compression ratio is increased on any diesel engine, _____.

A. the expansion ratio will decrease

B. combustion will be slowed down

C. thermal efficiency will decrease

D. thermal efficiency will increase

165. Which of the factors listed has the greatest effect on the mechanical efficiency of a diesel engine?

A. Temperature of the intake air

B. Friction within the engine

C. Mechanical condition of the supercharger

D. Mechanical condition of the turbocharger

166. The function of the piston compression rings used in a diesel engine is to_____.

A. seal the space between the piston and the liner

B. transmit heat from the piston to the cylinder liner

C. reduce the amount of combustion gas blow-by

D. All of the above

167. The main function of piston compression rings is to_____.

A. prevent excessive cylinder liner wear

B. reduce friction losses in the engine

C. seal the space between the piston and the liner

D. limit upward flow of lube oil into the combustion space

168. The flywheel reduces speed fluctuation by_____.

A. maintaining a constant rack setting

B. storing kinetic energy

C. maintaining equal exhaust pressure

D. maintaining even camshaft speed

169. Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is_____.

A. entirely constant pressure

B. entirely constant temperature

C. a combination of constant volume and constant pressure

D. a combination of constant temperature and constant pressure

170. In a single acting, two-stroke/cycle, diesel generator engine, the power impulse in an individual cylinder occurs_____.

A. once every crankshaft revolution

B. once every two crankshaft revolutions

C. once every piston stroke

D. twice every piston stroke

171. Piston compression rings used in a diesel engine function to_____.

A. transfer heat from the cylinder to the piston

B. scrape oil from the sides of the piston

C. seal the combustion space from the crankcases

D. prevent any piston contact with the cylinder liner

172. The highest loads applied to the diesel engine crankshaft main bearing are_____.

A. axial loads

B. firing loads

C. inertia loads

D. centripetal loads

173. Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by_____.

A. cylinder valves

B. compression rings

C. piston skirts

D. oil rings

174. The purpose of the flywheel is to_____.

A. provide energy to operate the engine between power impulses

B. neutralize the primary inertia force of the crankshaft

C. reduce the shock of starting loads on the main bearings

D. prevent the engine from operating at critical speed

175. In a modern internal combustion engine, the load carrying part of the engine is referred to as the_____.

A. bedplate or base

B. sump or oil pan

C. cylinder block

D. frame

176. In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?

A. Used of bimetallic piston rings

B. Ring gap pre-tensioning

C. Thermal increase in ring-end clearance

D. Gas pressure acting against the back of the ring

177. Valve lash, or clearance refers to the_____.

A. clearance between the top of the valve stem and the rocker arm

B. compression of the valve springs

C. clearance between the valve seat inserts and the head

D. out of the roundness of the fuel injection cams

178. In some modern larger diesel engines, which of the following is used as the support for the main bearing?

A. Bedplate

B. Block

C. Base

D. Sump

179. Piston cooling fins are located_____.

A. atop the piston crown

B. beneath the piston crown

C. at the base of the piston skirt

D. inside the cylinder liner cooling water jacket

180. Diesel engine valve springs function to_____.

A. hold the valves open

B. keep the valves off their seats until the exhaust stroke is completed

C. close the valves

D. open inlet valves when the air injection cycle begins

181. Valve cages are used on some large diesel engines to_____.

A. reduce wear on the valve stem

B. permit the use of alloy valve seat materials

C. reduce heat transfer from the valve seat

D. facilitate valve removal for servicing 182. In a diesel engine, an integral liner is one in which the cooling water_____.

(Ⅰ) flows through the cylinder liner jackets (Ⅱ) touches the outer side of the liner

A. Ⅰonly

B. Ⅱ only

C. Both Ⅰ and Ⅱ

D. NeitherⅠnor Ⅱ

183. Forcing the exhaust gases from the cylinder of an operating diesel engine with the aid of a blower is known as_____.

A. scavenging

B. forced draft

C. turbo-charging

D. aspiration

184. In a trunk type diesel engine piston, the thickness of the head or crown is determined by the_____.

(Ⅰ) statically balanced (Ⅱ) heat dissipation requirement

A. Ⅰonly

B. Ⅱ only

C. Both Ⅰ and Ⅱ

D. NeitherⅠnor Ⅱ

185. A crankshaft whose center of gravity coincides with its center line is said to be_____.

(Ⅰ) statically balanced (Ⅱ) dynamically balanced

A. Ⅰonly

B. Ⅱ only

C. Both Ⅰ and Ⅱ

D. NeitherⅠnor Ⅱ

186. At bottom dead center, the centerline of the connecting rod usually coincides with the_____.

A. angularity of the piston motion

B. inertia moment from the piston

C. centerline of the cylinder

D. centerline of the king pin

187. The process of supplying a diesel engine cylinder with air at a pressure greater than atmospheric is called_____.

A. engine displacement

B. super-aspirating

C. air injection

D. supercharging 188. In which of the scavenging methods listed will the exhaust valve be located in the cylinder head?

A. Return-flow

B. Uniflow

C. Cross-flow

D. Direct flow

189. The cylinder liner forming the cylinder wall and the inside of the water jacket is called a_____.

A. dry liner

B. wet liner

C. jacket liner

D. corrugated liner

190. Some diesel engines are supercharged with a_____.

A. slam charger

B. turbocharger

C. fuel atomizer

D. fuel injector

191. Why are some diesel engine cylinder liners plated on the wearing surface with porous?

chromium?

A. The chromium will not wear out the piston rings.

B. The chromium strengthens the liners in the way of the scavenging air ports.

C. Chromium eliminates the need for oil scraper rings.

D. Pores in the plating aid in maintaining the lube oil film.

192. Which of the listed bearing types in an example of a solid bearing?

A. Piston wrist pin bushing

B. Turbine bearing

C. Spring bearing

D. Diesel engine main bearing

193. The process of scavenging a two-stroke/cycle diesel engine serves to_____.

A. improve fuel flow volume

B. cool the exhaust valves

C. reduce the intake air charge density

D. increase the temperature of exhaust gases 194. The term diesel engine scavenging means_____.

A. delivering more air into the cylinder than it would normally receive during an ordinary

charging process

B. forcing the products of combustion out of the cylinder with the fresh air charge

C. collecting the air charge at the cleaner

D. combustion and expansion of hot gas

195. Air scavenging of a diesel engine cylinder_____.

A. blows out the exhaust gases

B. supplies oxygen for combustion

C. cools the valves and cylinder walls

D. All of the above

196. A properly honed diesel engine cylinder liner will_____.

A. prevent piston ring wear

B. shorten the ring break-in period

C. prevent cylinder liner glazing

D. appear slick and glazed

197. Which of the diesel engine cylinder liners listed has internal cooling water passages?

A. Internally finned liner

B. Externally finned liner

C. Wet liner

D. Integral water-jacket liner

198. The exhaust valve opens before bottom dead center in a four stroke engine to_____.

(Ⅰ)allow for blow down (Ⅱ) reduce pumping losses

A. Ⅰonly

B. Ⅱ only

C. Both Ⅰ and Ⅱ

D. NeitherⅠnor Ⅱ

199. One advantage of dry cylinder liners used in a diesel engine is the_____.

A. lower thermal expansion rates than wet liners

B. greater heat transfer rate than wet liners

C. greater wear resistance than wet liners

D. procedure to replace dry liners is simpler than for wet liners

三管轮轮机英语大证考试真题41期

中华人民共和国海事局 2006年第3期海船船员适任证书全国统考试题(总第41期) 科目：轮机英语试卷代号：805 适用对象：无限、近洋航区3000KW及以上船舶二/三管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至74题，每题1分，第75题至78题，每题1.5分,第79题至80题, 每题10分。 一、单项选择题 1. A diesel engine is similar to a gasoline engine except that the former has no ______. A. cross-head B. spark plug C. connecting rod D. cylinder 2. A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a ______. A. slow-speed diesel B. medium-speed diesel C. high-speed diesel D. constant-speed diesel 3.Which of the diesel engine components listed increases air density and helps to improve engine operating efficiency? A. Impeller B. Compressor C. After-cooler D. Exhaust diffuser 4.For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four- stroke/cycle diesel engine because ______. A. it has a longer power stroke B. more air gets into the cylinder each stroke C. it develops twice as many power strokes at the same speed D. higher combustion pressure is developed 5.The intake valves in a diesel engine are reseated by ______. A. cam followers B. push rods C. combustion gases D. valve springs 6.According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into two main systems, namely, the constant-pressure system and ______. A. the pulse-phase system B. the pulse Doppler system C. the pulse system D. the pulse interval system 7.An over-speed safety device is usually fitted to a generator engine for______in the event of over- speed. A. cutting power off the engine B. increasing the fuel pump setting C. braking the crankshaft D. stabilizing the ship speed 8.What preventative maintenance should be done frequently to diesel engine starting air receivers? A. Drain the accumulated moisture. B. Test the relief valves. C. Watch the temperature to prevent fluctuations in pressure. D. Clean the interior to remove oil and foreign matter. 9.Immediately after any diesel engine is started, the engineer should check the ______. A. crankcase pressure B. lube oil pressure C. seawater pressure D. exhaust temperature 10. A controllable pitch propeller on a diesel driven vessel eliminates the need for ______. A. friction clutches B. disconnect clutches C. reversing gears D. reduction gears 11.In motor ship, ______is often used to recover some of the heat carried in the exhaust gases from the main engine. A. an diesel oil heater B. a waste heat boiler C. a fresh water generator D. a donkey boiler 12.An exhaust gas bypass is installed on a waste heat boiler in order to ______. A. bypass exhaust gas at high loads to prevent excessive back pressure B. bypass a portion of the exhaust gas at peak loads for better efficiency C. recycle exhaust gas to the turbocharger D. minimize moisture condensation in the boiler gas passages at low loads 13.Prior to lighting off a cold automatically fired auxiliary boiler, you should ______. A. check and regulate the water level B. close the air cock once fires are lit C. blow down the gage glass D. assure protective steam flow 14.Flame failure in an automatically fired auxiliary boiler can mostly result from a/an ______. A. incorrect electrode setting B. incorrect nozzle position C. clogged fuel nozzle D. broken high tension lead 15.Waterside scale in a fire-tube boiler may cause ______. A. increased heat transfer B. fireside erosion C. high steam demand D. overheated tubes 16.Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? I. Its discharge is continuous; II. It has no internal valves; III. Upon accidental closing of discharge valve, excessive pressure will not build up A. I, II B. II, III C. I, II, III D. II only 17.Why are removable sleeves installed on centrifugal pump shafts? A. They make it easier to replace the pump shaft packing. B. They can be economically replaced as they wear out. C. They can be removed when it is necessary to lighten the weight of the pump. D. They increase the strength of the shaft. 18.If one of the bilge system manifold valves does not properly seat, the ______. A. bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied B. bilge system will lose vacuum and prevent the other bilges from being pumped out C. bilge well aft connected to that valve will siphon(虹吸) its contents to the forward bilge wells D. discharge pressure will be too high. 19.Which of the listed statements is correct concerning the starting of centrifugal pumps? A. They should always be started with the discharge valve closed. B. They should always be started with the discharge valve opened. C. A priming pump is always required to flood the impeller suction. D. They should always be started with the sealing line valves closed. 20.The simplest method to use for determining if a centrifugal pump is operating as designed, is to ______. A. closely observe the pump discharge temperature B. close off the discharge valve, and watch for a rise in pressure C. momentarily close off the suction valve, and watch for a rise in pressure D. use a clamp on ammeter and compare the readings to past records

轮机英语历年真题43期

中华人民共和国海事局 2007年第2期海船船员适任证书全国统考试题(总第43期) 科目：轮机英语试卷代号：805 适用对象：无限、近洋航区3000KW及以上船舶二/三管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至74题，每题1分，第75题至78题，每题1.5分,第79题至80题, 每题10分。 一、单项选择题 1.______ the engines, the diesel engine is ______ used engine on board. A. Between/more commonly B. Among/the most commonly C. Between/not more commonly D. Among/ not the most commonly 2.The average pressure exerted on a piston during each power stroke is termed ______. A. indicated horsepower B. mean effective pressure C. exhaust back pressure D. compression pressure 3.The cetane number rates fuels for diesel engines according to its ______. A. antiknock characteristics B. ignition qualities C. rates of vaporization D. viscosity 4.The time between injection and ignition of the fuel is known as ______. A. turbulence lag B. after burning ratio C. pre-ignition lag D. ignition delay 5.______ controls the fuel oil temperature in order to provide oil at the correct viscosity for combustion. A. The viscosity regulator B. The temperature controller C. The flow meter D. The pressure switch 6.Constant cooling the various components of diesel engine has a number of functions except for ______. A. good lubrication B. low thermal stress C. good mechanical properties D. acid corrosion 7. A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an ______. A. torque limiter B. over-speed trip C. over-speed governor D. load limit governor 8.Engine speeds at which resonance can occur are termed ______. A. maximum speeds B. full speeds C. sea speeds D. critical speeds 9.Prolonged operation of a diesel engine with a closed cooling water system at lower than normal designed operating temperatures can ______. A. increase power output B. decrease lube oil viscosity C. eliminate fuel knock D. cause sulfuric acid formation 10.______ on a ship transmits power from the engine to the propeller. A. The automatic control system B. The speed regularly system C. The transmission system D. The compression air system 11.In a _____ boiler the hot gases from the furnace pass through the tubes while the water is on the outside. A. water-tube B. fire-tube C. exhaust gas D. composite 12.The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler ______. A.salinity is abnormally B.high steam demand is too high C.feed-water flow is low D.water level is abnormally low 13.The water in a steaming auxiliary boiler should be tested daily for ______. A. dissolved oxygen B. chlorides C. sludge D. dissolved nitrogen 14.Ignition failure in an automatically controlled auxiliary boiler could be caused by ______. A. carbon deposits on the flame scanner B. high fuel oil temperature C. low fuel oil viscosity D. high steam pressure 15.The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of ______. A. seawater contamination B. frequent surface blows C. dissolved oxygen de-aeration D. frequent bottom blows

轮机大管轮英语真题48期

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