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steam study
quize questions
| Question | Answer |
|---|---|
| of the impurities commonly found in marine lubricating oil, which of the following can NOT be removed by a centrifugal purifier at normal operating temp? | soluble sludge |
| if a soot blower element does not revolve freely, the most likely cause would be ________. | war-page of the soot blower element |
| a rapid fluctuation of the supper heater outlet temp on a steady steaming boiler could indicate___________. | water carryover into the supperheater |
| a boiler safety valve must be capable of_______. | remaining open until a preset pressure drop occurs |
| when a boiler water test indicates a pH value of 6, you should_______. | chemically treat to raise the pH to normal level |
| coast guard reg (46 CFR) requires machinery driving the fuel oil transfer and fuel oil service pumps to be fitted with a remote means of stopping the machinery___________. | outside of the space concerned |
| which of the listed items are the two most commonly used opposing forces involved in the operation of a constant pressure feed pump governor? | pump discharge pressure and adjusting spring compression |
| shortly after shutting off the fuel to a boiler which is to be secured, the___________. | burner registers should be closed |
| which of the pumps is normally used in fuel oil service systems? | positive displacement rotory |
| design characteristics of a velocity-compounded impulse turbine include the utilization of _______. | a single pressure stage with two or more velocity stages |
| if live steam is supplied directly to the tank heating coils, the collected drains in the "clean" section of the contaminated drains tank are removed directly to the _________. | atmospheric drain tank |
| failure to use the turning gear prior to warming up a main turbine will damage the ______. | rotory assembly |
| to avoid pulsations of the burner flame after rebuilding the boiler burner front tile refractory,_______. | the burner tile should fitted to the throat ring rather than the surrounding brick work |
| what refractory materials may be used with other machinery insulation arrangements outside of the boiler? | insulating cement |
| the high pressure steam drain system is normally collected by the ________. | deaerating feedwater heater |
| coast guard reg (46 CFR) for boiler fuel oil service systems, require that _____________. | the return line from the burners must be arranged so that suction piping cannot be subject to discharge pressure |
| the FIRST step in breaking vacuum on a main turbine unit should be to __________. | secure the steam to the main air ejector |
| in a boiler where the drum water level is automatically controlled, which of the following conditions could cause erratic variations in the water level? | high total dissolved solids content and foaming in the drum |
| main steam turbine bearings are lined with _________. | babbitt |
| to comply with coast guard reg (46 CFR) which type of boiler listed shall be subjected to a hydrostatic test at one and one half times max allowable working pressure? | all water-tube boilers to which extensive repairs have been made |
| a turbine assembly in which steam flows in a series through a HP turbine and then on to a LP turbine, with both turbines driving a common reduction gear through separate shafts, is classed as _____. | cross-compound |
| the sentinel valve located on the LP turbine casing is designed to _________. | warn the engineer of excessive pressure in the LP casing |
| the max temp rise of oil passing through any reduction gear set, or bearing, should not exceed ______. | 50 deg F (27.8 deg C) |
| panting or rumbling in a boiler furnace is usually caused by ________. | not enough air |
| prolonged astern operations of a turbine will cause ______. | overheating of ahead stages |
| in a marine boiler, max heat transfer rates can be obtained by ______. | keeping the watersides free from scale deposits |
| the main feed check valve functions to __________. | prevent back flow of water from the boiler in the event of feed pump failure |
| rapid discharge condensate into the DC heater during normal steaming conditions could cause _____. | decrease in aux exhaust pressure |
| the possibility of a flareback in a boiler will be reduced if you ________. | purge the furnace with fresh air prior to lighting off |
| two-element feedwater regulators operate by sensing _________. | boiler water level and steam flow |
| an obstruction in the top connection of a boiler gage glass will cause the __________. | water level to to rise slowly in the glass |
| condensation accumulation in the steam side of a fuel oil heater could result in _______. | reduced heating capacity in an operating heater |
| a turbo-generator back pressure trip can be actuated as a result of __________. | insufficient circulating water flow through the condenser |
| thin tipping is a type of turbine blade design primarily used to ______. | reduce losses due to blade tip leakage in reaction turbines |
| what is one of the devices found on a LP main propultion steam turbine casing? | sentinel valve |
| reaching which "end point" will result in the most sever damage to the boiler? | circulation |
| which possible condition has occurred if a vacuum is present at the atmospheric drain tank vent while the vessel is underway | the control valve regulating flow to the main condenser is stuck in an open position |
| in some lube oil systems, the temp of the lube oil downstream from the lube oil cooler is directly regulated by ________. | a thermostatically controlled valve which bypasses oil around the cooler |
| how is diaphragm type steam whistle protected from damage due to entrained condensation? | a water separator is installed in the steam supply line |
| the term "separation " as used in oil purification refers to the removal of _________. | two liquids from eachother |
| if you noted a large difference in the pressures indicated by a duplex pressure gage to the fuel oil system strainer, you should ________. | shift to a clean fuel oil strainer |
| if while filling the boiler a newly installed gasket on a water-tube hand hole plate weeps, you should ______. | center and tighten with correct size wrench |
| in which of the following types of condensers would you find the cooling water passing through tubes with the turbo-generator exhaust steam directed around the outside of the tubes? | surface |
| as lube oil absorbs moisture its dielectric strength can be expected to ________. | decrease |
| the formation of a pit in the surface of a boiler tube is most likely to occur when ________. | the tube acts as an anode |
Created by:
trowland
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