Motor collections part 2

101. In a coil-type auxiliary water-tube circulation boiler

A. unevaporated feedwater collects in the bottom of the flash chamber

B. all generated steam is recirculated through heating coils in the boiler

C. heated water flashes to steam in the boiler heating coils

D. response to steam demand is slower than in a fire-tube boiler

102. For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because

A. changing filter elements would not interrupt engine operation

B. filtering occurs twice in each pass of oil through the system

C. clogging will not occur

D. dropping pressure is half of that through a single filter unit

103. As per regulations, within how many hours before each departure, satisfactory working of the steering gear must be checked?

A. 2

B. 12

C. 24

D. None of the above

104. Modern 4-stroke medium speed, marine diesel engine exhaust valve spindles are rotated by providing

A. Nozzle rings

B. Tappet clearance

C. Spinners or vanes

D. Rotocaps

105. The purpose of economizer is to:

A. Decrease the capacity and size of the auxiliary boiler

B. Cooling down the exhaust gases in order to reduce NOx emission

C. Allowing Sox to react at low temperatures with water to form acids thus reducing Sox emission

D. Increasing the overall efficiency of the main propulsion plant

106. Microbiological growths in marine fuel are a common occurrence that can be

A. extremely detrimental to equipment and operating processes

B. prevented by maintaining proper storage temperatures

C. removed from emulsified fuel oil during the centrifuging processes

D. All of the above are correct.

107. The function of the tie rods is to:

A. Keep the engine components under tension at all the times

B. Just secure the engine parts together

C. Act as holding down bolts for the bedplate and keeps all the engine components together

D. Keep engine components under high compression, so that tensile stresses acting during firing stroke do not exceed this pre-compression to avoid fatigue failure

108. Which of the following types of crankshafts is much lighter at similar power requirements?

A. Fully built type

B. Semi built, all welded type

C. Semi built type

D. Solid forged type

109. After an engine has been started using a Bendix drive unit, the drive gear, or pinion disengages from the flywheel due to

A. the action of a spring

B. rotation of the starting cam

C. the higher rotating speed of the flywheel

D. accumulator pressure

110. Fuels as produced in a refinery are generally sterile, however, contamination can occur as fuels are

A. stored at the refinery

B. stored on the vessel

C. transported to the distribution sites

D. All of the above are correct.

111. Which of the following statements is false?

A. Excessive cylinder liner lubrication can aggravate scuffing.

B. Use of anti polishing ring reduces scuffing.

C. Deep honing of liner fails to give an ideal liner surface.

D. None of the above

112. In a fully built or semi built type crankshaft, how can any slippage at shrink fit be identified?

A. By inspecting the locking arrangement provided

B. By checking the dowel provided.

C. By checking the witness mark provided for reference .

D. By checking the performance of the engine

113. Which of the following is one of the major advantages of resin choking over cast iron choking, in holding down arrangements of modern diesel engines?

A. Better vibration damping properties.

B. Better compressive strength

C. 100% contact, no need for surface preparation

D. None of the above

114. In a 2-stroke crosshead type of engine, the side thrust generated due to rolling and connecting rod and fore-aft thrust due to pitching motion of the ship is taken care of by the:

A. Piston and the liner

B. Connecting rod and the piston rod

C. Crosshead shoes and guides

D. Crankpin and thrust bearing

115. In a VIT equipped jerk type fuel pump:

A. Raising the barrel delays beginning of injection

B. Lowering the barrel delays beginning of injection

C. Raising the barrel delays end of injection

D. Lowering the barrel delays end of injection

116. The over speeding of the diesel engine driving an electric generator could cause

A. low voltage trip to trip

B. reverse power trip to trip

C. damage to windings

D. excessive exhaust temperatures

117. In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?  

A. Bed plate

B. Column

C. Entablature

D. Tie rod

118. A diffuser is provided at the end of a mechanical atomizer in boiler onboard

A. To prevent blow back of the flame

B. To mix the air and fuel properly

C. To prevent blow out of the flame

D. To eject the excess fumes from the atomizer

119. Steam stop valve is eased of its seat during boiler start up from cold

A. To allow thermal expansion of parts

B. To allow steam flow during start up

C. To prevent water hammer

D. All of the above

120. Which of the following statements about the design of D- type boilers, is false ?

A. The heavier water in top drum flows back to the bottom drum through the down- comers outside the furnace

B. Inside the furnace the water is heated up in the risers

C. The upper drum is the steam/water drum and the lower one is the water drum.

D. The feed water is pumped into the lower drum

121. Presence of catalytic fines in fuel oil is significant to engineers on board because

A. Catalytic fines tend to impair proper operation of purifiers

B. Catalytic fines lead to abrasive wear in liners, piston rings and fuel injection equipment

C. Catalytic fines necessitate increase in injection temperature

D. Catalytic fines necessitate increase in storage temperature

122. With reference to the data logger for a refrigerate sys. Which of the parameters should be noted?

A. Sea water temp, pressure

B. Condenser temp

C. Refrigerant leakage

D. Evaporator temp.

123. Which of the following factors affect penetration of fuel droplets during injection?

A. Quality of atomization

B. Injection temperature

C. Scavenge air pressure

D. All of the above.

124. Lube oil pumps taking suction from the sump of most small marine engines are usually

A. of the diaphragm type

B. of the centrifugal type

C. positive displacement type

D. independently driven by electric motors

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

A. excessive crankcase pressure

B. excessive lube oil temperature

C. contamination of the lube oil by water

D. contamination of the cooling water by lube oil

126. Excessive axial thickness of a piston ring can lead to ____________________

A. Scraping off of oil from liner surface

B. Increased wear

C. Twisting in the groove

D. Difficulty in formation of oil wedge

127. Which of the following is an ???adhesive??? type wear of a cylinder liner?

A. Clover- leafing

B. Scoring

C. Scuffing

D. Ovality

128. Cylinder heads of marine diesel engines are provided with _________ to relieve any excessive pressure within the combustion chamber

A. Safety valves

B. Indicator cocks

C. Relief valves

D. Bursting discs

129. Working of a pulse pressure turbocharger depends upon the ___________ that can be safely created in the exhaust system.

  A. Enthalpy drop

B. Pressure difference

C. Turbocharger rpm

D. Pressure pulses

130. The maximum elongation of timing chains in service is limited to ___________ of original chain length.

A. 2%

B. 1%

C. 5%

D. 3%

131. Duplication of power units, fittings and pipings where each unit is capable of providing 100% steering power, and automatic isolation of one unit in the event of a leakage(single failure) in that unit would constitute 100% redundancy for the steering gear system. Such system is mandatory on ____________

A. All tankers

B. Tankers above 10000 GT

C. Tankers above 100000 Dwt

D. All ships above

132. Routine cleaning of air side of air cooler of main engine is done by:

                A. Circulating fresh water

B. Circulating cold chemical solution

C. Circulating warm chemical solution

D. Circulating hot water

133. What prevents rotation and fretting between a thin shell bearing and its housing?

A. Location tangs or pegs

B. The nip or crush of the bearing

C. A special kind of adhesive

D. Any of the above

134. Microbial degradation of main engine sump oils can lead to:

A. Increased clogging of lube oil filters

B. Corrosive attack on journals and bearings

C. Formation of stable emulsions

D. All of the above.

135.  In case of constant pressure turbo charging, the exhaust of the cylinders goes into :

                A. Small diameter exhaust pipes with exhaust grouping

                B. Exhaust compensators

                C. Nozzles

                D. Large diameter pipes

136. Which of the following is a limiting factor in cylinder liner cooling?

                A. Maximum combustion temperature

                B. Minimum liner temperature

                C. Exhaust temperature

                D. Dew point for formation of sulfuric acid

137. Which of the following is not a consequence of over lubrication of a cylinder liner?

A. Deposits in piston top land which can not only consume lube oil but always lead to increased abrasive wear

.B. Sticking and jamming of piston rings due to increased deposits.

C. Unburnt lube oil in scavenge spaces posing increased risk of scavenge fire .

D. Increased corrosive wear

138. Variable geometry turbocharging is the preferred choice over conventional turbochargers because :

  A. T/C efficiency is very high at high engine loads

B. T/C has good starting characteristics while efficiency at full loads is slightly compromised

C. T/C efficiency is optimized for different engine loads by changing nozzle ring geometry

D. T/C is much cheaper and simple to manufacture and is virtually maintenance free

139. As a thumb rule, ovality in crankpins of medium speed engines should not exceed _____________ of bearing clearance.

  A. 10%

B. 15%

C. 25%

D. 30%

140. In a naturally aspirated diesel engine, the volume of air intake is directly related to engine

  A. compression ratio

B. valve size

C. fuel pressure

D. cylinder clearance volume

141. Two important considerations for the proper lubrication of a diesel engine include, the delivery of the oil in sufficient amount, and the

  A. cetane number

B. pour point

C. viscosity temperature

D. quality of the oil

142. What is material of impeller of a T/C compressor ?

 A. Stainless steel

B. Mild steel

C. Aluminium silicon

D. Bronze

143. One of the major disadvantages of constant pressure turbocharging over pulse pressure turbocharging is :

  A. Reduction in specific fuel consumption

B. Lengthening of effective stroke leading to greater expansion in engine

C. Poor turbocharging efficiency

D. Inability of the system to operate at low loads and slow response during acceleration

144. Friction, engine wear, and oil consumption in a diesel engine are directly related to the

  A. acidity of the oil

B. pour point of the oil

C. flash point of the oil

D. viscosity of the oil

145. Improper maintenance of an automatic auxiliary boiler oil burner could result in

  A. fuel pump failure

B. fan motor failure

C. increased feedwater consumption

D. decreased boiler efficiency

146. The effect of excessive tappet clearance is:

A. Increased engine efficiency as expansion can take place for a longer duration and less energy wasted with the exhaust gases

B. Valve hammering, change in timing of exhaust with more side thurst causing greater wear between stem and bush

C. Loss in compression, poor combustion, improper mixing of fuel & air and gas leakage due to improper closing of valve

D. Turbocharger surging, loss of rotation of valve spindle and high exhaust temperatures

147. The difference between rotocap and spinners for rotating exhaust valve spindle is that:

  A. Rotocaps rotate the valves while closing, while spinners rotate them while opening

B. Rotocaps rotate the valves while opening, while spinners rotate them while closing

C. Rotocaps rotate the valves while opening, while spinners rotate the valve for the entire duration until valve is seated

D. Spinners rotate the valves while opening, while rotocaps rotate the valve for the entire duration until valve is seated

148. Most fuel injection nozzles are opened by

 A. fuel oil pressure

B. a cam operated follower

C. a spring-loaded pressure plate

D. timing gears keyed to the crankshaft

149.  Which of the following is a electro- hydraulic type steering gear

  A. Rotary Vane type

B. Ram type

C. Both rotary vane type and ram type

D. None of the above

150. Which of the following purposes is solved by a piston rod gland or stuffing box ?

  A. To provide an air seal between scavenge space and crankcase

B. To prevent ingress of combustion products, unused cylinder lube oil, debris etc into the crankcase

C. To prevent carry over of sump oil into the crankcase

D. All of the above

151. Which of the following is a feature of Sulzer TriboPack package?

  A. Mid level liner insulation

B. Deep honing of liner

C. Pre- profiled and coated piston rings

D. All of the above

152. In which of the following steering modes, rudder will be locked at a particular angle until next manual order?

  A. Follow up

B. Auto pilot

C. Non Follow up

D. None of the above

153. Failure of the burner flame in an automatic auxiliary boiler would probably be a result of

A. water in the fuel oil

B. broken high tension leads

C. incorrect electrode setting

D. full fuel pressure at the nozzle

154. As per regulations, the torque capacity of a steering gear system should be such so as to be able to turn the rudder__________________________

A. 35 degrees one side to 35 degrees on the other side at maximum service speed

B. 35 degrees one side to 30 degrees on the other side at maximum service speed

C. 35 degrees one side to 35 degrees on the other side at normal service speed

D. 35 degrees one side to 30 degrees on the other side at normal service speed

155. The output pressure of a diesel engine lube oil pump is regulated by a/an

 A. relief valve

B. metering valve

C. variable speed pump drive

D. orifice in the lube oil header

156. Most T/C have -------- flow type of Compressor and --------flow type of Rotor

a. Centrifugal Radial , Impeller axial

b. Centrifugal axial, Impeller radial

c. Centrifugal mixed, Reaction Radial

d. Rotary axial, Reaction Radial

157. Factors of lower limit of thrust by clearance

a. Adjustment of crankshaft

b. To allow thrust pads to tilt generated oil wedge

c. Proper lubrication

158. use of synthetic polymer treatment limited to low pr boiler, why?

a. does not help in prevention of scale formation

b. does not help in corrosion prevention

c. does not form phosphate to tackle caustic embrtllmnt

d. all of above