competence 5.1

50問 • 1年前

問題一覧

128. Purifier and clarifier are both working on the principle of

Centrifugal separation

102. An upper average ash content of 0.1% by weight is generally in heavy fuel oils. Which of the following conditions could be expected if the ash content increases above this amount?

Exhaust valve wear is increased.

1. Very small irregularities on the seat and disk of a globe valve may be manually repaired with the valve in place by the process known as

Lapping in

10. What is the allowed quantity of oil in water that an oily water separator should be following?

According to Marpol, the oil content of the effluent mus be less than 15 ppm

100. Setting the relief valve opening pressure in a hydraulic system lower than the required operating pressure will result in ?

lowers the operating efficiency of the system

100. Setting the relief valve opening pressure in a hydraulic system lower than the required operating pressure will result in ?

lowers the operating efficiency of the system

101. Separator functions to separate both solid and liquid impurities of oil is known as

Purifier

103. What parts of Discharge Oil monitoring and control system unit calculates the oil discharge in litres/nautical miles and the total quantity when permissable limit has been reached?

A Computing unit

104. Valves used in the machinery space piping systems, and constructed with threaded valve systems, must be

right-hand closing(clockwise)

105. What control valve listed below is NOT considered to be hydraulic system directional control valve?

Unloading valve

106. What particular type of sewage treatment is basically a storage tank which collects solid matters for disposal in permitted areas or to a shore collection facility ?

Chemical method

107. The purpose of the reaction turbine dummy piston is to

counteract axial thrust toward the turbine low pressure end

108. Viscosity of fuel in the atomizer can be reduced by.

increasing the fuel oil heater steam supply

109. By which of the following is the attached vacuum pump of a ballast pump is driven?

Pump driven clutch

11. In a diesel engine, excessive lube oil consumption can be caused by

plugged oil wiper rings

110. While the oily-water seperator is operating in the processing mode, if a low vacuum, what is the probable cause?

The coalescer beads are severely fouled

111. What equipment is used to compress a gas and to circulate it around the piping system?

Refrigerating compressor

112. The Volume of the pump chambers are increase and decreased by the reciprocating motion of the

piston

113. The main feed pump discharge pressure is controlled by the admission of steam to the turbine. The admission of steam is regulated by a.

constant-pressure governor

114. Which of the following statements represents the function of insulating brick?

Acts as backup insulation behind firebrick, plastic refractory, or castable refractory

115. Longitudinal expansion of a boiler water drum is permitted by the .

foundation

116. The viscosity of fuel oil is indicated by its

internal friction

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

spring force

118. The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the

Feedwater vapor pressure

119. When the centrifugal disk type purifier is in separation process, the bowl position is,

closed

12. In the hydraulically operated turbine gland seal regulator, illustrated, the device used as the sensing unit is called alan

bellows

120. In oily water separator which one of the following stages resposible for removing physical impurities present and promotes some fine separation?

The first-stage filter

121. What particular device is installed in the fuel systems of the ship that is used to control the fuel oil temperature to provide correct viscosity for combustion?

Viscosity regulator

122. The amount of sodium phosphate in treated boiler water can be measured by alan.

phosphate test

123. If one of the bilge system manifold valve does not properly seat, what effect could be expected during pumping operation ?.

bilge system will lose vacuum and prevent the other bilges from being pumped out

124. Low pressure steam is used to keep air from leaking into turbine casing along the turbine shaft. For this purpose, which of the following steam systems is used?

Gland sealing steam system

125. Purifier is using gravity disc during oil purification to establish correct

Interface

126. What will you install in order to prevent accidental flooding of the engine room bilges?

stop check-valve

127. What is the result of the centrifuge if the bowl of a centrifugal purifier is improperly reassembled with O-ring seals that have become hard and flat ?

Will begin to lose its water seal.

129. Which of the following actions should be taken FIRST if one-bilge wells of the multiple suction bilge system is unable to pump out ?

Attempt to pump out another bilge well to determine if the entire system is affected

13. Which of the devices listed is used to keep overheated condensate from flowing to the deaerating feed tank?

Recirculating line to the main condenser

130. To avoid oil from discharge into the sea when ballasting

start the cargo p/p then close sea suction valve

131. Modern fuel oil temperature control devices are regulated to obtain a desired viscosity rather than a specific fuel oil temperature because .

the relationship between temperature and viscosity varies with different fuels

132. Maximum limit of fuel density to allow efficient oil cleaning of purifier is

991kg / m3

133. Testing boiler water for chloride content will indicate the amount of .

solids in the water from sea contamination

134. Prior to centrifuging, a heavy residual fuel oils are heated to

reduce fuel viscosity

135. If a centrifugal pump is not rotating after being overhauled, what may be the possible cause?

Uneven tightening of casing bolts.

136. The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will

vary from section to section throughout the heat exchanger

137. What reason why there is Less vacuum in centrifugal pump?

Loss on gland packing

138. Condensate pumps have distinctly noticeable characteristics and are recognized by their .

large suction chambers and impeller eyes

139. In a disk type centrifugal purifier operating as a separator, if diesel fuel was discharging from the waste water outlet, you should

reprime the purifier

14. Which of the listed pumps discharges directly to the fuel oil settling tanks of a diesel engine main propulsion plant?

Transfer pump

140. What is the cause when a centrifugal pump may fail to deliver water when first started?

Pump is not primed.

141. A test of boiler water for chloride content indicates the amount of .

seawater contamination present

142. What functions to provide the right amount of fuel at the right moment and in a suitable condition for the combustion process?

Fuel injection system

competence 4.1

ERNO ENRIQUE JOMENTO · 50問 · 1年前

competence 4.1