1 / 377

The ability of a fuel particle to travel into the combustion chamber before burning is called _____________.

2 / 377

Fuel oil discharged to the diesel engine cylinder is atomized at the _____________.

3 / 377

An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with _____________.

4 / 377

The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to _____________. I. assist in a quick cutoff of fuel injection II. prevent fuel oil backflow from the injection pump

5 / 377

Explosion relief valves on diesel engine crankcases should relieve the pressure at not more than _________.

6 / 377

Which of the following statements concerning a closed type fuel injection nozzle is true?

7 / 377

Piston cooling fins are located _____________.

8 / 377

In describing basic diesel engine operation, the term "event" refers to _____________.

9 / 377

In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called _____________.

10 / 377

In a diesel engine, exhaust valves open before the intakeports are uncovered to ___________. I. reduce pumping losses II. reduce back pressure

11 / 377

How are hydraulic tappet clearance adjusters on diesel engine rocker arm assemblies lubricated?

12 / 377

The main purpose of the piston oil scraper rings is to _____________.

13 / 377

A diesel engine indicator diagram has an area of 22 cm2 and a length of 12.5 cm. If the scale of the indicator spring is 1 mm = 1 kg/cm2, what is the cylinder mean effective pressure?

14 / 377

The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of ______________.

15 / 377

The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by _____________.

16 / 377

What is the swept volume per cylinder per revolution of a six-cylinder, two-stroke/cycle diesel engine with a 580 mm bore and a 1700 mm stroke operating at 100 RPM?

17 / 377

Crankcase explosion relief valves should be of the ________.

18 / 377

In a diesel engine, internal combustion causes the piston to be moved by _____________.

19 / 377

The valve stem expansion associated with engine warm-up is allowed for by the ____________.

20 / 377

In a diesel engine mechanical-type fuel pump, the delivery check valve is opened by ____________.

21 / 377

A viscous damper, as used on a marine diesel, is a sealed precision built device which dampens the torsional vibrations in the _____________.

22 / 377

The purpose of compressing the air within the cylinder of a diesel engine is to __________.

23 / 377

One advantage of dry cylinder liners used in a diesel engine is the _____________.

24 / 377

Turbulence of the compressed air charge in a diesel engine cylinder increases _____________.

25 / 377

Where engine bores exceed 230 mm, a bursting disc or flame arrestor is fitted ____________.

26 / 377

A large, low-speed, main propulsion diesel engine uses sea water to directly cool the _____________.

27 / 377

A main propulsion diesel engine crankshaft bearing lacking sufficient "crush", will _____________.

28 / 377

In the Otto cycle, the fuel/air mixture is ignited at what point and by what means?

29 / 377

Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?

30 / 377

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

31 / 377

Which of the components listed is NOT found in a single acting engine?

32 / 377

Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce _____________.

33 / 377

A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an _______________.

34 / 377

A properly honed diesel engine cylinder liner will ________.

35 / 377

Which of the following listed construction details of internal combustion engines is required?

36 / 377

Increasing the load on an engine using a double-helix type injection pump varies the effective stroke of the pump to start _____________.

37 / 377

Fuel injector nozzles are usually of the multi-orifice type with the number and placement of the holes arranged according to the _____________.

38 / 377

Cavitation erosion in the cooling water system of a diesel engine usually occurs at the pump impeller, and on the waterside of the _____________.

39 / 377

A diesel engine piston ring face is in direct contact with the _____________.

40 / 377

Telescopic pipes to the piston of a large slow speed main propulsion diesel engine are designed to prevent _________________.

41 / 377

Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?

42 / 377

A diesel engine with a full speed of 1000 RPM drives a propeller at 300 RPM. What is the speed reduction ratio?

43 / 377

The blower type crankcase ventilation system ____________.

44 / 377

Successful combustion inside the cylinders of a diesel engine is dependent upon _____________.

45 / 377

Fuel injection pumps using the port and helix metering principle requires the use of a ___________.

46 / 377

Which of the following will occur when the lower edge of the spiral, on the plunger of a jerk pump, uncovers the spill port?

47 / 377

Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of ____________.

48 / 377

The intake air ducting to a diesel engine should not draw from an area on deck where flammable vapors released from tanks are present, because ____________.

49 / 377

Which characteristic of the Otto cycle occurs in the actual diesel cycle but NOT in the theoretical diesel cycle?

50 / 377

Many diesel engine exhaust valves are being constructed with hollow stems filled with sodium in order to _____________.

51 / 377

A two stroke diesel engine exhaust temperaturewill be lower than a four stroke diesel engine of the same displacement because the ___________. I. scavenging air is cooling the exhaust gases II. exhaust cycle time is longer

52 / 377

The power developed by a large slow-speed main propulsion diesel engine is dependent upon the ______________.

53 / 377

The small end of the connecting rod is attached to the piston with a _____________.

54 / 377

A six cylinder 2-stroke/cycle, single acting diesel engine has a 580 mm bore and a 1700 mm stroke. What indicated power per cylinder will be developed if the average mean effective pressure is 15.3 kg/cm2 at a speed of 120 RPM?

55 / 377

Which of the listed conditions will affect the mean effective pressure the most in the cylinders of a diesel engine?

56 / 377

One of the advantages in the use of a dry liner over a wet liner is _____________.

57 / 377

Diesel engine main and connecting rod precision bearings are made in halves. Each half exceeds one-half the bearing circumference by a small amount. The small amount is termed _____________.

58 / 377

Which of the bearing types listed is commonly used for main bearings in small internal combustion engines?

59 / 377

A crankshaft whose center of gravity coincides with its center line is said to be __________.

60 / 377

For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because ____________.

61 / 377

Fuel oil penetration into the cylinder of a diesel engine is _____________.

62 / 377

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

63 / 377

The device most commonly used to measure exhaust gas temperature of cyclinders is a _____________.

64 / 377

In which of the following areas of a crosshead engine is a permanently connected fire extinguishing system required?

65 / 377

What is the purpose of a hydraulic tappet clearance adjuster?

66 / 377

Vibrations from diesel engines and engine driven equipment are isolated from the hull structure by _____________.

67 / 377

The duration of fuel injection developed by an individual port-and-helix fuel injection pump, is determined by the ____________.

68 / 377

In comparing engines of equal horsepower, higher exhaust gas temperatures occur in a/an _____________.

69 / 377

Poor timing of the fuel injection system is similar to the effects of poor _____________.

70 / 377

The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its ______________.

71 / 377

Which of the following statements pertains to propulsion engines with bores exceeding 200 mm?

72 / 377

Theoretical perfect combustion in a diesel engine yields by-products of _____________.

73 / 377

In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in _______________.

74 / 377

A thrust bearing is used with a propulsion diesel engine to _____________.

75 / 377

Engine displacement is equal to the cylinder _____________.

76 / 377

Many diesel engines have pistons with concave heads to _____________.

77 / 377

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

78 / 377

What is the function of an engine's stationary parts?

79 / 377

A seven cylinder, two-stroke/cycle, single acting diesel engine with a cylinder indicated horsepower calculated as 1350 kW and brake horsepower measured at 7466 kW has a mechanical efficiency of ______________.

80 / 377

Diesel engine fuel oil leakage should be drained and additional precautions provided to __________.

81 / 377

Which of the following is an example of a solid bearing?

82 / 377

The time between injection and ignition of the fuel is known as _____________.

83 / 377

In a diesel engine, the contact surfaces of the piston compression rings are those in contact with the___________. I. back of the ring groove II. bottom of the ring groove

84 / 377

A unit type fuel injector is used on a diesel engine to _____________.

85 / 377

In a unit injector, an upper helix and lower helix are machined in the lower part of the plunger for _____________.

86 / 377

Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent __________.

87 / 377

A six cylinder, two stroke/cycle diesel engine is 83% efficient and has a cylinder constant of 0.998 while operating with a mean effective pressure of 15 kg/cm2 at a speed of 100 RPM. What is the metric brake horse power developed?

88 / 377

Injection pressure in a common rail fuel system is controlled by _____________.

89 / 377

Besides the use of piston cooling fins to assist in cooling,they also provide extra strength for the piston ___________.

90 / 377

Which of the listed bearing types is an example of a solid bearing?

91 / 377

The amount of fuel delivered by a helical plunger fuel injection pump is controlled by _____________.

92 / 377

Valve cages are used on some large diesel engines to _____________.

93 / 377

Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion cycle which is _________.

94 / 377

What is required for crosshead type engines that have a scavenging space in open connection to the cylinder?

95 / 377

In a two-stroke/cycle, opposed piston, diesel engine, one crankshaft operates several crank angles in advance of the other crankshaft to _____________.

96 / 377

The end of fuel injection in a port-and-helix metering pump can be controlled by _____________.

97 / 377

The minimum fuel oil delivery pressure required for efficient injection depends primarily on the ______________.

98 / 377

What is the term given to the process of breaking up fuel oil into very fine particles for better combustion?

99 / 377

An indicator card or pressure-volume diagram, shows graphically the ____________.

100 / 377

How many crankcase relief valves are required for a 325mm bore, eight cylinder in-line engine?

101 / 377

The intake and exhaust valves used in a diesel engine are returned to their seats by _____________.

102 / 377

Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and an individual pump for each cylinder?

103 / 377

The main function of tie rods in the construction of large, low speed diesel engines is to ____________.

104 / 377

Which of the listed bearing installations is subjected to swinging motion?

105 / 377

Some fuel injection systems utilize port-and-helix metering. Which of the following statement describes a system "timed for port closing"?

106 / 377

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

107 / 377

The flywheel reduces speed fluctuations by _____________.

108 / 377

Which of the diesel engine exhaust mufflers listed is usually equipped with a spark arrestor?

109 / 377

A piston is said to be at top dead center when it is ______.

110 / 377

The speed of the camshaft in a two-stroke/cycle diesel engine, running at 950 RPM, is _____________.

111 / 377

The diameter of a piston is usually less at the crown than at the skirt, in order to ______________.

112 / 377

Wet-type exhaust silencers, used with some diesel engines, have which of the following design features in common?

113 / 377

Why is it necessary to compress the air charge in the cylinders of a diesel engine?

114 / 377

The diesel engine valve subjected to most severe conditions of service is the ____________.

115 / 377

Which of the bearings listed below is most widely used for the main and connecting rod bearings of a modern high-speed diesel engine?

116 / 377

In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the ______________.

117 / 377

Where is the fuel delivery check valve located in a jerk pump fuel injection system?

118 / 377

The theoretical minimum compression ratio necessary to ensure compression ignition in a direct injection diesel engine is _____________.

119 / 377

Barrel face, taper face, grooved, and chrome plated are all types of diesel engine _____________.

120 / 377

Internal combustion engine crankcase vent outlets must be equipped with ______.

121 / 377

For any piston ring to operate smoothly without scuffing, the ring must be _____________.

122 / 377

Compared to other fuel injection systems, unit injectors operate with virtually no _____________.

123 / 377

Which of the bearings listed are most widely used for the main and connecting rod bearings of a diesel engine?

124 / 377

In order to reverse the rotation of a two-stroke/cycle loop scavenged, direct reversing, propulsion diesel engine, the cam positions must be changed for the _____________.

125 / 377

What is to be installed on an internal combustion engine if its cylinder bore exceeds 200mm?

126 / 377

When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as ______________.

127 / 377

Thin bronze rings are inserted in the face of some chromium plated piston rings to _____________.

128 / 377

In a diesel engine, crosshatch on the liner surface aids in___________.I. rapid ring seating II. the retention of lube oil

129 / 377

The average exhaust temperature of a two-stroke/cycle diesel engine with a turbine-driven supercharger is lower than a similar four-stroke/cycle diesel engine at equal loads because ____________.

130 / 377

Which term describes piston pins having bearing surfaces in both the piston bosses and connecting rod eye?

131 / 377

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

132 / 377

A loop or cross scavenged engine utilizes the motion of its pistons and a turbocharger to provide scavenging air. Which of the listed mechanical designs prevents the air under the pistons from being pumped back through the scavenge ports during the piston

133 / 377

In diesel engines designed with a crosshead, the motion of the piston rod can be described as _____________.

134 / 377

A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a ____________.

135 / 377

Diesel engines are classified as reciprocating internal combustion engines because they ______________.

136 / 377

The port-and-helix metering pumps, used in diesel fuel injection systems, are usually designed to produce a constant beginning and a variable ending of fuel injection. These pumps are usually _____________.

137 / 377

Engines having a bore exceeding 250 mm, but not exceeding 300 mm are to have at least _________.

138 / 377

During the fuel injection period, fuel pressure must exceed cylinder gas pressure to _____________.

139 / 377

Which of the following statements is an accurate description of fuel injection piping used on diesel engines with a cylinder bore of 250 mm and above?

140 / 377

Cylinder linings constructed as an integral part of the block, are characterized by which of the following disadvantages?

141 / 377

Maximum power of a diesel engine is attained ____________.

142 / 377

Main propulsion diesel engines having a bore exceeding 300 mm are to have at least _________.

143 / 377

Which of the following statements concerning the factors affecting ignition delay is correct?

144 / 377

Injection lag can be caused by ____________.

145 / 377

A diesel engine is driving an alternator required to run at1800 RPM. The overspeed governor is normally required tobe set within a range of ______________.

146 / 377

The valve cam slope angle determines the _____________.

147 / 377

The most rapid period of fuel combustion occurring in a diesel cylinder should begin just before the piston reaches top dead center and ______________.

148 / 377

One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the _____________.

149 / 377

In a single-acting diesel engine, the cylinder liner area that is most difficult to lubricate is the ______________.

150 / 377

The most rapid period of fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and ____________.

151 / 377

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

152 / 377

The most common instrument used to measure diesel engine exhaust pressure is the _____________.

153 / 377

In a diesel engine, the time period between fuel injection and ignition is usually defined as _____________.

154 / 377

The term "proper metering", as applied to a diesel fuel injection system, can be best defined as _____________.

155 / 377

On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by ____________.

156 / 377

The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work. This is known as _____________.

157 / 377

The exhaust system for a turbocharged two-stroke/cycle diesel engine functions to _____________.

158 / 377

When the lower edge of the spiral begins to uncover the release port in a jerk pump, the _____________.

159 / 377

The main reason for using bimetallic piston rings is to ______________.

160 / 377

In diesel engines, hydraulic valve lifters are used to ____________.

161 / 377

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

162 / 377

Which of the bearings listed is most widely used for main and connecting rod bearings of modern diesel engines?

163 / 377

Which of the air intake systems listed will result in the lowest specific fuel consumption?

164 / 377

In an operating diesel engine, the sealing of the cylinder is the result of the compression rings being forced against the cylinder walls by _____________.

165 / 377

Differential needle valves used in fuel injectors are directly closed by _____________.

166 / 377

Where is the charge for an air starting system stored?

167 / 377

The greatest turbulence in a diesel engine cylinder is created by the _____________.

168 / 377

The compression ratio of a diesel engine refers to the ratio between the _______________.

169 / 377

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

170 / 377

Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is _________.

171 / 377

A built-up exhaust valve is one in which _____________.

172 / 377

When is fuel injected into a cylinder of diesel engines?

173 / 377

Exhaust gases in a two-stroke/cycle diesel engine are discharged through _____________.

174 / 377

Additional explosion relief valves are fitted on separate spaces of the crankcase such as gear or chain cases for camshaft or similar drives when the __________.

175 / 377

The device used to limit engine torque at various engine speeds is called a ______________.

176 / 377

The opening of an exhaust valve on a modern, large, low- speed, main propulsion diesel engine, may be actuated by _____________.

177 / 377

When may the crankcase ventilation pipes or oil drain pipes of two or more engines be connected?

178 / 377

Precombustion chambers differ from turbulence chambers in that precombustion chambers _____________.

179 / 377

What is the purpose of the "window" installed in the housing of an individual jerk pump?

180 / 377

A method of finishing diesel engine cylinder walls to aid in the proper ring seating and lubrication is known as ____________.

181 / 377

The main function of piston compression rings is to _______.

182 / 377

Which of the following statements describes the operating characteristics of a precombustion chamber?

183 / 377

Cylinders diameters greater than 230 mm require additional safety devices when the scavenging spaces are openly connected to the cylinders. Which of the following devices will be used to protect such spaces?

184 / 377

An important design characteristic of an explosion relief valve for a diesel engine is the ability to _________.

185 / 377

Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by rotational and reciprocating forces?

186 / 377

Connecting rods in a diesel engine are used to connect the _____________.

187 / 377

In some modern large diesel engines, which of the followingis used as the support for the main bearings?

188 / 377

The difference in crank lead between the upper and lower cranks of an opposed piston engine causes the lower crankshaft to ____________.

189 / 377

The shape of a diesel engine cam determines the ___________.

190 / 377

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 _____________.

191 / 377

Which of the listed characteristics is common to both wet and dry type diesel engine exhaust mufflers?

192 / 377

A secondary function of diesel engine piston rings is to _____________.

193 / 377

What is the metric brake horse power developed per cylinder by an 83% efficient, six cylinder, two-stroke/cycle diesel engine with a cylinder constant of 0.998 and a mean effective pressure of 15 kg/cm2 at 100 RPM?

194 / 377

Turbulence in a diesel engine cylinder is of major importance in providing _____________.

195 / 377

The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by __________.

196 / 377

The function of diesel engine piston compression rings is to ____________.

197 / 377

The amount of fuel delivered by a unit injector is controlled by the _____________.

198 / 377

The driving force of a propeller is transmitted to the hull through the_____________.

199 / 377

Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during _____________.

200 / 377

In a diesel engine, pistons are attached to the crankshaft by _____________.

201 / 377

Which of the equal power diesel engines listed, running at the same speed, is least affected by exhaust back pressure?

202 / 377

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

203 / 377

How many power strokes per crankshaft revolution are there in an eight cylinder, two-stroke/cycle diesel engine?

204 / 377

The exhaust ports of a diesel engine using the crossflow scavenging method are opened and closed by the ____________.

205 / 377

The purpose of a heat dam used in some diesel engine cast iron pistons is to ____________.

206 / 377

The plunger in a jerk pump is rotated until the release port is uncovered. If the port remains uncovered all of the time, which of the listed operations will occur?

207 / 377

Proper atomization of fuel in diesel engine combustion chambers will _____________.

208 / 377

Provision is to be made for ventilation of an enclosed diesel engine crankcase by means of a small ________.

209 / 377

The purpose of counterboring the top of the cylinder liner, extending down to the top point of travel of the top compression ring, is to _____________.

210 / 377

Between the periods of injection and ignition of the fuel, a diesel engine crankshaft rotates through the ____________.

211 / 377

Which statement regarding the arrangement and location of explosion relief valves used on an internal combustion engines is true_____________?

212 / 377

One function of diesel engine lubricating oil is to _______.

213 / 377

The rate of fuel injection in a diesel engine cylinder depends primarily on _____________.

214 / 377

Oil for piston cooling is delivered through the connecting rod to a compartment in the piston head, then distributed as a result of piston motion, and finally drained to the crankcase through one or more holes or pipes. This procedure is known as the

215 / 377

Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of _____________.

216 / 377

Concerning diesel propelled vessels, the astern power is to provide for continuous operation astern ___________.

217 / 377

The crankcase of many diesel engines are kept under a slight vacuum by the ______________.

218 / 377

gudgeonpin bearings are difficult to lubricate because of their oscillating motion and _____________.

219 / 377

A diesel engine exhaust valve spring is under compression when _____________.

220 / 377

One method of constructing large marine diesel engines and reducing the total engine frame weight is through ____________.

221 / 377

Carbon deposits building up, in, and around the injection nozzle tip are least likely to occur when using which of the listed types of fuel injector nozzles?

222 / 377

In a two-stroke/cycle diesel engine, the camshaft rotates at _____________.

223 / 377

The primary purpose of the open combustion chamber used in diesel engines is to _____________.

224 / 377

When monitoring diesel engine performance, the most useful instrument to use is the _____________.

225 / 377

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 ________.

226 / 377

A characteristic of a bearing material which permits small dirt particles to become embedded in it's surface is ________________.

227 / 377

Camshafts are usually driven by timing gears or ___________.

228 / 377

Which of the construction techniques listed is used on new piston rings to facilitate run-in or seating?

229 / 377

Diesel engine valve springs function to _____________.

230 / 377

The rate of pressure rise during the period following fuel ignition process in a diesel engine, is influenced chiefly by the ____________.

231 / 377

Which of the fuel systems listed combines the injection pump and the injection nozzle in one housing?

232 / 377

Differential type fuel oil nozzles in a diesel engine areclosed directly by _____________. I. spring pressure II. fuel oil pressure