latihan soal pasca prala att3 Operate main and auxiliary machinery and associated control systems (MPU)

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Operate main and auxiliary machinery and associated control systems (MPU)

  1. What refrigerant temperature would you expect to find at the compressor discharge of an air conditioning system?

  1. +40° C

  2. +85° C

  3. -10 °C

  4. +5 °C

  5. I Don't Know.

  1. What action should be taken if the boiler water tests show that the pH-value in the boiler water is slightly over 11.5?

  1. Blowdown the boiler and decrease the dosage of boiler water treatment chemicals

  2. Blowdown the boiler and Increase the dosage of boiler water treatment chemicals.

  3. Raise the boiler water level above normal to dilute the contents.

  4. No action is required this is the normal level

  5. IDon't Know

  1. Which of the following changes would occur when the temperature of lubricating oil is reduced?

  1. Concentration of contaminants would increase

  2. Flash point would increase

  3. Pour point would reduce

  4. Viscosity would increase

  5. IDon't Know.

  1. What would be considered as an acceptable range for the p-alkalinity in a low pressure auxiliary boiler?

  1. 600- 1000 ppm CaCO3

  2. 100 -300 ppm CaCO3

  3. 0 -100 ppm CaCO3

  4. 300- 600 ppm CaCO3

  5. IDon't Know.

  1. Why are duplex filters usually employed in the lubricating oil system of an auxiliary diesel engine?

  1. The pressure drop is half that of a single filter unit.

  2. It gives better filtration of the oil.

  3. Changing of the filter element can be carried out without interrupting engine operation.

  4. Filter blockage wil not occur

  5. I Don't Know.

  1. Many modern medium and high speed diesel engines operate at very high power ratings resulting in relatively high bearing loads. In order to accommodate these loads the bearings are required to have a high load carrying capacity.What kind of bearings are normally used for main and bottom end purposes to achieve this?

  1. Thin steel shells lined with aluminium tin alloys.

  2. Thin steel shells with a thin white metal lining.

  3. Thick white metal types with the white metal cast into the keeps to give extra fatigue strength.

  4. Thin steel shells with a copper lead lining and a running in overlay.

  5. I Don't Know.

  1. What is the correct method to be used to obtain a reduced output from a centrifugal pump?

  1. By adjusting the pump relief valve

  2. By throttling of the pump discharge valve

  3. By throtting of the pump suction valve

  4. By opening the pump recirculation line

  5.  IDon't Know.

  1. From the options given, select the conditions that you would expect to give best separation results from a centrifuge operating as a purifier

  1. High flow rate and high temperature

  2. High temperature and low flow rate

  3. Low flow rate and low temperature

  4. High flow rate and low temperature

  5. I Don't Know

  1. What action is required if boiler water tests confirm a pH value of less than 9?

  1.  Increase the dosage of alkalinity treatment chemicals until the pH value is back within normal range.

  2. Reduce the dosage of alkalinity treatment chemicals until the pH is back within normal range

  3.  No action is required

  4. Blowdown the boiler and refill with good feedwater.

  5. I Don't Know.

  1. The diagram shows a the symbol for a component from a hydraulic circuit. What component does it represent?

  1. A throttle valve

  2.  A pressure relief valve

  3. A directional control valve

  4. A check valve

  5. I Don't Know

  1. What would be a typical oil feed temperature for purifying heavy fuel oil in a centrifuge in order to ensure good separation?

  1.  85-88 Celsius

  2. 105- 108 Celsius

  3. 95-98 Celsius

  4. 75-78 Celsius

  5. I Don't Know

  1. What is the main reason for keeping engine lubricating oil viscosity within recommended limits?

  1. To neutralise any acids that may form

  2. I is not important

  3. To ensure the strength of the oil film is sufficient to keep lubricated surfaces apart

  4. To reduce system pressure losses

  5. I Don't Know.

  1. What effect does an increased oil feed flow rate have on the performance of a centrifuge operating as a purifier?

  1. Separating efficiency is increased, more water is removed

  2. Separating efficiency is reduced

  3. Separatirlg efficiency is unchanged

  4. Separating efficiency is increased, more solids are removed

  5. I Don't Know.

  1. Which factor influences the pumping capacity (flow) of a centrifugal pump the most?

  1. Liquid density

  2. Suction pressure

  3. Total pressure head

  4. Liquid temperature

  5. I Don't Know

  1. The Base Number of a lubricating oil is an indication of which of the following

  1. The alkalinity of the oil

  2. The Flash Point of the oil

  3. The viscosity of the oil

  4. Amount of contaminants in the lubricating oil

  5. I Don't Know.

  1. What is the main problem associated with oil in a steam boiler water system?

  1. It causes corrosion of steel in the boiler.

  2. it forms an insulating film on heat transfer surfaces with the risk of overheating

  3. It increases scale deposits in the boiler.

  4. It causes the gauge glasses to become dirty preventing the operator from seeing the water level.

  5. IDon't Know.


  1. When the boiler safety valves operate due to the boiler pressure being too high the excess steam is discharged to

  1. the atmosphere via the atmospheric line

  2. the auxiliary condenser

  3. the main condenser

  4. the engineroom bilges

  5. i Dont Know.

  1. In a purifier assuming the separating temperature is correct, what is the probable cause of the processed oil containing water?

  1. The gravity disc is too small and/or the flow rate is too high

  2. The gravity disc is too large

  3. The back pressure at the clean oil outlet is too high

  4. The throughput is too low

  5. I Don't Know.

  1. What is the firstrthing that should be checked when taking over a boiler watch?

  1. The oil pressure to the burner

  2. The boiler water level

  3. The boiler room bilge level

  4. The boiler exhaust gas colour

  5.  I Don't Know.

  1. What would be a typical setting for the low lubricating pressure trip for a refrigeration compressor?

  1. O +5.0 bar

  2. O0.5 bar

  3. O 10 bar

  4. O 1.0 bar

  5. IDon't Know.

  1. What is the purpose of an oil mist detector, OMD, as fitted to a diesel engine?

  1. To detect and give an alarm and slowdown of any potentially explosive atmosphere in the crankcase.

  2. To check the efficiency of the crankcase extractor fan.

  3. To detect and give an alarm and slowdown in the event of a crankcase explosion

  4. .To detect scavenge air leakages from the piston rod stuffing box.

  5.  IDon't Know

  1. A piston ring set for a trunk piston engine often includes a slotted ring tensioned by an internal spring. What is the purpose of this type of piston ring?

  1.  It is an oil control ring

  2. . It is a ring to seal the crankcase from the combustion chamber

  3. . It is the lowest compression ring.

  4.  It is the firing ring.

  5.  I Don't Know.

  1. Why is it important to check the timing of diesel engine cylinder oil lubricators?

  1. To ensure cylinder lubricating oil enters the cylinders when the piston is in the required position.

  2. To ensure the correct amount of cylinder lubricating oil is fed into the cylinders.

  3. To ensure the piston is not covering the lubrication points and blocking the flow of cylinder lubricating oil into
    the cylinder

  4. To avoid excess pressure in the cylinder lubrication system.

  5. I Don't Know

  1. How is the effective delivery stroke of a helix type fuel pump for a diesel engine controlled to increase or decrease
    the quantity of fuel delivered?

  1. The fuel rail pressure relief valve setting.

  2. The fuel booster pump delivery pressure

  3. Rotation of the plunger by the fuel rack from the governor signal

  4. The fuel injector setting.

  5. Dont Know.

  1. What is the main effect on lubricating oil of operating for long periods at excessively high temperature?

  1. It will cause the oil to evaporate, increasing consumption

  2. It will change the flashpoint of the oil

  3.  It will cause the oil to oxidise, reducing the viscosity

  4. It il cause the oil to oxidise, increasing the viscosity

  5. I Don't Know.

  1. With reference to diesel engine ancillary system operation, which one of the given statements is true?

  1. The normal jacket water temperature before the jacket water cooler is approximately 80 to 90 C.

  2. The normal scavenge air temperature after the charge air cooler is approximately 80 to 90 C.

  3. The normal temperature of the lubricating oil before the lub oil cooler is approximately 80 to 90 C.

  4. The normal temperature of heavy fuel oil after the fuel oil heater is approximately 80 to 90 C.

  5. I Don't Know.

  1. How is the condenser cooling water flow regulating valve automatically controlled in a vapour compression refrigeration system?

  1. By the temperature of the refrigerant after the evaporator

  2. By the temperature in the refrigerated room

  3. By the quantity of refrigerant in the system

  4. By the compressor discharge pressure

  5. I Dont Know.


  1. Which of the following could cause a blowback from a steam boiler oil fired furnace?

  1. Having the fuel oil temperature too high

  2. Opening air registers too quickly

  3.  Having the fuel oil pressure too high

  4. Trying to ignite burner from ht bickwork

  5. IDon't Know.

  1. What is the purpose of an expansion valve in a refrigeration system circuit?

  1. To control the cooling water temperature through the condenser

  2. To control the cargo hold temperature

  3. To control the suction pressure at the compressor

  4. To control the flow rate of liquid refrigerant to the evaporator

  5. IDon't Know.

  1. What is meant by the term "two stage air compressor"?

  1. A compressor in which the air is delivered to two separate air receivers each at different pressures

  2. A compressor in which the compressed air from the first stage is further compressed in the second stage before being delivered to the air receiver

  3. A set of two compressors. The first compressor delivers low pressure air to an air receiver. The second further compresses the air for delivery to the working range

  4.  A two cylinder compressor in which half of the air is compressed in one cylinder and half in the other

  5. I Don't Know.

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