Gas Turbine Exam: 3rd Class Stationary Steam Engineer License Prep, Exams of Nursing

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Gas turbine exam, 3rd class stationary

steam engineer license prep

steam - correct answers-Steam turbines are driven by the pressure of high- velocity_____________ discharged at a high pressure and temperature against the turbine vanes. multistage - correct answers-A(n) __________ turbine is used as driver for high- differential pressure and high horsepower applications. governor - correct answers-A ___________ is used to control the speed of the turbine as steam is channeled through the restrictive component called a nozzle. combustion chamber - correct answers-Provides a place for the fuel and air to be mixed and then burned. Compression - correct answers-During what stage of a combustion gas turbine can heat recovery take place? It is also called a back-pressure turbine / It functions like a pressure reducing valve / Steam exits at a lower pressure. - correct answers-Which of the following is true of a no n-condensing steam turbine? (select all) Machine failure / Turbine shutdown - correct answers-When equipment hazards are associated with a failure to maintain sufficient inlet steam pressure. (select all) Gas Turbine - correct answers-_______ is a device that uses the combustion of natural gas to spin the turbine rotor. Hydraulic Turbine - correct answers-_______ is a device that is operated or affected by a liquid (water wheel)

Reaction Turbine - correct answers-_______ is a device that uses a reactive force of pressure or mass of the motive fluid to turn a rotor; this is an example of newtons third law of motion. Steam Turbine - correct answers-______ is a device that is driven by the pressure of high-velocity steam. Impulse Turbine - correct answers-_________ is a device that uses a directed flow of high velocity fluid against rotor blades to move the rotor; an example of newtons second law of motion. Governor - correct answers-_______ is a device used to control the speed of a piece of equipment, such as a turbine. Fixed Blade - correct answers-________ is a blade inside a turbine, attached to the casing, that determines the direction of the power fluid. Rotating Blade - correct answers-________ components attached to the shaft of the turbine. The motive fluid causes the turbine to spin by impinging on the rotating blades. Inlet, Compressor, Diffuser, Accessory Gear Box - correct answers-Name in order, with the direction of flow, the components of the Cold section. Combustor, Turbine, Exhaust - correct answers-Name in order, with the direction of flow, the components of the Hot section. Compressor, Diffuser, Combustor, Turbine - correct answers-What are the 4 sections of the Gas Turbine that are required for operation in order with flow direction? Convergent Ducts - correct answers-________A duct that increases Velocity of a fluid, while decreasing the Pressure and Temperature. Divergent Ducts - correct answers-______A duct that decreases Velocity of a fluid, while increasing Pressure and Temperature. Humidity - correct answers-Three factors that affect power output of a gas turbine are, RPM's, air density, and (______________). Inlet Guide Vanes - correct answers-What do the letters IGV stand for? Axial Flow Compressor - correct answers-(______________) compressors compress air, parallel to the axis of the machine, either horizontally or vertically. Stationary Vanes - correct answers-A (______________) (___________) is a part of the gas turbine that is needed to convert the velocity of the air flow into pressure. In the compressor section, these are placed after every row of rotating blades.

broken barning's and lack of lubrication - correct answers-What are the most common two problems to have on a steam turbine? Thrust bearing - correct answers-What type of bearing is designed to keep the rotor from moving "back and forth"? labyrinth seal - correct answers-What type of seal consists of a series of ridges and intricate paths designed to stop flow? reducing friction, cooling, sealing, cleaning, and serving as protection for moving parts - correct answers-List 5 of the main functions of the lubrication system. The Brayton Cycle - correct answers-______is the constant pressure cycle of energy transformation used by turbine engines, also known as the open cycle. Compressor Spool - correct answers-_____ is a spool is a compressor and turbine connected by a common shaft. Primary air - correct answers-25 to 35 percent of the available air is mixed with fuel and burned. Secondary air - correct answers-65 to 75 percent of the available air is used for cooling the combustor and turbine, and for flame positioning in the combustor. Turbine Nozzle Diaphragm - correct answers-_________To increase the velocity of the gas flow. To direct the airflow onto the first stage turbine rotor. turbine blade - correct answers-_______Used to convert the kinetic energy of the combustion gasses into mechanical energy to drive the output shaft. Impulse, Reaction, Impulse-Reaction, Axial Flow turbine - correct answers-Types of turbines Turbine Blade Cooling - correct answers-______To keep the turbine blades protected from the high temperature coming from the combustor. Silencer systems - correct answers-________ is used universally between the inlet and exhaust sections. Parallel Baffle (splitter) system - correct answers-1.Consists of sound absorbing materials between two perforated materials. Cohesion and Adhesion - correct answers-Both are needed for proper lubrication

Oil Reservoir - correct answers-is used to store the oil during non-operation, and to de- aerate the oil during operation. Hydraulic Motors - correct answers-_____Use hydraulic fluid to rotate the starter. Pneumatic Starter - correct answers-_____use air or gas to turn an impulse or vane turbine to rotate the gas turbine. Diesel Motor - correct answers-________ are the starter of choice for large gas turbines. (25,000 SHP and above) The Rankine Cycle - correct answers-________ is the most widely used cycle for steam turbines. _________ are necessary for complete combustion - correct answers-time, temperature, mixture, and atomization if the steam pressure gauge indicates 200 PSIG, the absolute pressure is______ - correct answers-214. a boiler is operating at 400 PSI, and the safety valve opens at 410 PSI and closes at 398 PSI. The blowdown is______psi - correct answers- an oil cooler is commonly used with a(n) ________ when operating in conjunction with a turbo-generator - correct answers-steam turbine a boiler is producing 40,000lb of steam/hr at a pressure of 100 PSI and a steam temperature of 500 degrees Fahrenheit. The steam produced is _______ steam - correct answers-superheated the economizer on a boiler is used to _______ - correct answers-add heat to the feed water blowers are normally used with________ boilers - correct answers-water tube overheating of tubes on a boiler can be caused by________ - correct answers-scale on tubes carbon dioxide in a condensate return system causes_________ - correct answers- channeling a ________ pump is a positive displacement pump - correct answers-reciprocating a boiler generating 6000 lb of steam/hr produces _______btu/hr - correct answers- 6,000,

combustion efficiency can be increased when air is________ - correct answers- preheated ______ draft is produced by a fan located between the boiler and the chimney - correct answers-induced the overspeed trip on a steam turbine should be tested ______ - correct answers-before putting the steam turbine on-line a high CO2 reading in the gases of combustion is a sign of____ - correct answers-High combustion efficiency the purpose of chemically treating feedwater is to________ - correct answers-turn scale-forming salts to a non adhering sludge water in a d rating feed water heater is prevented from entering the steam line by a(n) _______. - correct answers-Loop seal or internal overflow a steam turbine operating at 3600 RPM will trip at_________ rpm - correct answers- 3960 he steam line going to The Blowers is connected to the main ________ - correct answers-steam drum before using blowers on a boiler,________ - correct answers-drain soot blower lines an accumulation of snow on the Fireside of a boiler tubes________ - correct answers- decreases boiler efficiency a globe valve installed in the feed water line between the feed water pump and boiler has a pressure from the feed water pump_________ the valve disc - correct answers- under the range of a pressure gauge should be twice the safety valve setting, but not less than______ time (s) the safety valve setting - correct answers-1 1/ hard scale formed on the inside of tubes is best removed by________ - correct answers-air- or water-driven turbines to correct a low water condition,_____ - correct answers-secure fires desuperheater drain is used to_______ - correct answers-establish steam flow a sudden rise in chimney temperature with no increase in load indicates______ - correct answers-there is a broken baffle

the btu content of natural gas is_____ - correct answers-100,000 btu/therm the safety valve setting on the Steam and water drum is ________ a superheater safety valve - correct answers-higher than the btu content of number 6 fuel oil is approximately - correct answers-18750 BTU / lb chemicals can be added to a boiler by a______pump - correct answers-proportioning the feed water stop valve is found between the____ - correct answers-boiler and check valve sensible heat is______ - correct answers-heat that can be measured with a thermometer balanced draft is______ - correct answers-constant furnace pressure slightly below atmospheric pressure a flame rod_______ - correct answers-ensures that the gas pilot is lighted there are approximately_____btu in 1 cu ft of Natural Gas - correct answers- the pH of boiler water may be controlled by using ______ - correct answers-caustic soda boiler water with a pH of 11 is________ - correct answers-alkaline a scotch Marine boiler is easily identified because it_____ - correct answers-has a cylindrical internal furnace the air flow switch at the burner fan housing________ - correct answers-and shows the primary air fan is functioning the asme code recommends that low water fuel cutoff switch be tested by an evaporation test__________ - correct answers-monthly a neutral solution is_______ on the pH scale - correct answers- a dry pipe separator _____ - correct answers-delivers higher-quality steam to the header draft is carefully controlled to_____ - correct answers-completely burn fuel supplied to the burner draft is measured with a_________ - correct answers-manometer

the only type of safety valve allowed on a boiler by the asme code is a_____ safety valve - correct answers-spring-loaded pop the primary function of a boiler is to _____ - correct answers-generate steam efficiently if the burner is firing and no water is in the gauge glass, the best procedure to follow is to_______ - correct answers-shut down the burner and secure the boiler a high pressure boiler operates at a pressure above______ PSI and 6 BHP - correct answers- a safety valve on a boiler pops______ - correct answers-between working pressure and mawp in a fire tube boiler, the Heat and gases of combustion pass _________ - correct answers-through the tubes as steam pressure in a boiler increases, there is a corresponding increase in the ______ - correct answers-temperature of steam and water the safety valve on a boiler _____ - correct answers-prevents the boiler from exceeding its mawp a steam trap ______ - correct answers-automatically remove sand and water without loss of steam the amount of excess air in gases of combustion is normally determined by the analysis of______ - correct answers-O before lighting off a boiler during a cold startup, the operator must first______ - correct answers-check for the correct water level boiler should be warmed up slowly when starting up to ______ - correct answers-allow uniform expansion of drums and tubes combustion requires____ - correct answers-fuel, oxygen, and Heat the three most common fuels used in boilers are _____ - correct answers-gas, fuel oil, and Coal incomplete combustion can be caused by ______ - correct answers-insufficient air after replacing a gauge glass but before placing it in service, it is necessary to ______ - correct answers-crack open the steam valve in warm the gauge glass

two bottom blowdown valves are required on boilers operating at pressures above______ psi - correct answers- extra heavy steel pipe is required on a boiler bottom blowdown line when the pressure is above ____ psi - correct answers- package boilers are programmed to _____ - correct answers-ignite the burner in low fire there are________ sq ft of heating surface in a water tube 3 1/2" in diameter and 20' long - correct answers-18. to change 1 lb of water from and at212 °f into steam at atmospheric pressure,______ btu are necessary - correct answers-970. a surface condenser is one that______ - correct answers-has circulating water flowing through the tubes and exhaust steam around the outside of the tubes a boiler is rated at 30,000 lb/hr and has a 5% blow down loss. The minimum size feed water pump to supply this boiler is ________ gal./hr. - correct answers- three types of draft used in power plants are______ - correct answers-natural, forest, and induced in a water tube boiler, heat and gases of combustion pass______ - correct answers- around the tubes when the burner is in high fire, the______ - correct answers-air-fuel ratio is at maximum rate a boiler with a draft gauge showing a positive pressure indicates_____ - correct answers-furnace pressure is above atmospheric pressure downcomer tubes are found _____ - correct answers-in a water tube boiler a boiler connected in battery requires a free blowing drain between the two stop valves when the ______ - correct answers-boiler has a manhole opening most furnace explosions are caused by _____ - correct answers-failure to purge the furnace at startup baffles in the boiler are designed to direct gases of combustion for close contact with the ________ - correct answers-boiler heating surface the overspeed tripping device on a steam turbine must be tripped when____ - correct answers-shutting down the steam turbine

the frequency of performing a bottom blowdown is determined by ______ - correct answers-boiler Water Analysis normally a water column and gauge glass should be blown down _____ - correct answers-at the start of a shift in whenever and out of the water level a thermostatic trap opens when the____ - correct answers-the Bellows contract an economizer located in the path of the gases of combustion increased boiler efficiency approximately 1% for each ___°f rise in feed water temperature - correct answers- the purpose of a vent on the open feedwater heater is to _____ - correct answers- remove oxygen and non condensable gases steam pressure gauges are calibrated in____ - correct answers-pounds per square inch bottom blowdown lines are located______ - correct answers-at the lowest part of the water side of the boiler sewer lines are protected from pressure and temperature by the _______ when blowing down a boiler - correct answers-blowdown tank the upper connection to a gauge glasses closed. If the boiler has a normal water level, the level on the gauge glass will show _______ glass - correct answers-full combustion controls on a boiler are used to _____ - correct answers-control the air fuel ratio ceiling strips that warned of excessive radial tolerance are found on_____ - correct answers-steam turbines pre-purge, air to fuel ratio, and post Purge of the burner are functions of the _______ - correct answers-combustion controls a water column______ - correct answers-reduces fluctuations of water in the gauge glass the low water fuel cutoff can be tested by _____ - correct answers-allowing the water level to drop boilers that are equipped with air heaters and economizers usually have_____ draft fans - correct answers-forced and induced

baffles are used in the Steam and water drum of water tube boilers to _____ - correct answers-prevent water carry over with the steam a closed feedwater heater is always installed_______ - correct answers-on the discharge side of the feed water pump the purpose of a burner pressure control is to _____ - correct answers-start and stop the burner firing cycle a gas pressure regulator is used to control the ______ - correct answers-gas pressure at the burner if the chimney temperature is 250 degrees Fahrenheit higher than the Steam and water temperature, the boiler is _______ - correct answers-not operating efficiently the most controllable heat loss in a boiler is from the loss of heat in______ - correct answers-gases of combustion on the feed water line, the valve closest to the boiler shell is a _____ valve - correct answers-stop four basic systems found on boilers are ______< - correct answers-steam, feed water, fuel, and draft if a low-water condition occurs, the operator should first _______ - correct answers- secure the burners a pressure control on a boiler is used to. _______ - correct answers-control the operating range of the boiler sup blowers are most commonly found ______ - correct answers-on water tube boilers a duplex reciprocating feed water pump operates on the principle that the _______ - correct answers-steam piston area must be 2 to 2 1/2 times larger than the water piston when testing the safety valve by hand, it is the accepted practice to have. _________ - correct answers-at least 75% popping pressure before testing oxygen in a boiler drum causes. ________ - correct answers-pitting __________ steam turbines allow condensate to be reclaimed for use in the system - correct answers-condensing with water at a temperature of 212°f, 1 bhp is equivalent to the evaporation of 34.5 lb of water every ________ hour(s) - correct answers-

a combustion control on a boiler. _______ - correct answers-controls the air-fuel ratio when coal is classified, ________ refers to hardness - correct answers-rank _______ gauge glasses are used on boilers with precious exceeding 250 psi - correct answers-flat oxygen and non condensable gases are removed from feed water by ________ - correct answers-heating the water __________ combustion is when all fuel is burned using only the theoretical amount of air - correct answers-perfect water tube boilers require less water than. _________ boilers - correct answers-fire tube a boiler equipped with a draft gauge and registering a negative pressure indicates. _________ - correct answers-atmospheric pressure is greater than furnace pressure pressure atomizing burners atomized fuel oil using _______ - correct answers-a nozzle the. _________ on the steam turbine functions as a limit switch - correct answers- overspeed trip circulating water passes through a surface condenser. ________ - correct answers- inside the tubes The Pour point of a fuel oil is. ________ - correct answers-the lowest temperature at which oil will flow a condensate pump is located 75 ' below the feed water heater and its discharged gauge reads 75 PSI. The pressure at the inlet to the heater is. _______ psi - correct answers-42. a boiler burning fuel oil and using forced-draft requires. ________ cu ft a furnace volume per boiler horsepower - correct answers-. a boiler evaporates 48,000 lb of steam/hr. it evaporates 12 lb of steam/sq ft of heating surface per hour. The boiler has _______ as ft of heating surface - correct answers- 4000 a steam turbine exhaust end and condenser are prevented from excess pressure by ________ - correct answers-the atmospheric relief valve at 0 psi, _______ btu are necessary to change 1 lb of water from and at 212°f into steam - correct answers-970.

________ boilers can operate at higher pressures than fire tube boilers - correct answers-water tube the first step when using a soot blower is ________ - correct answers-open Steam line drain the purpose of a vent on an open feedwater heater is to _______ - correct answers- remove air and other non condensable gases cooling water and steam are in in direct contact with each other in a(n) ________ condenser - correct answers-surface a boiler with 3450 sq ft of heating surface design for 5 sq ft of heating surface / BHP has ________ hp - correct answers- a water column _________ - correct answers-dampens fluctuating water level a closed feedwater heater is always installed. ________ - correct answers-on the discharge side of the feed water pump _________ is required for combustion - correct answers-atomization of fuel, oxygen, and Heat heating value of natural gas is expressed in _______ - correct answers-therms spalling in a boiler occurs in the_______ - correct answers-combustion chamber economizers are used in Plants to _____ - correct answers-heat feedwater using gases of combustion fuel oil with a high viscosity_______ - correct answers-it's hard to pump boiler water is chemically treated to _____ - correct answers-prevent scale from forming on the boiler heating surfaces steam pressure gauges are calibrated in _____ - correct answers-pounds per square inch feed water temperature raised 10 degrees Fahrenheit from exhaustion or heat from gases of combustion result in an increase of ________% in plant efficiency - correct answers- the evaporation of 34.5 lb of water from and at 212°f is a standard for ______ - correct answers-1 bhp

overheating of tubes in a water tube boiler result if_________ - correct answers-scale builds up on the inside of the tubes complete combustion occurs when ______ - correct answers-all combustible material is burned with a minimum of excess air according to the asme code, the adjusting of safety valves should be done by the ______ - correct answers-manufacturer or authorized representative in a steam generating plant, the economizer is used to _______ - correct answers-heat feed water when testing a safety valve by hand, the pressure on the boiler should be at least ___________% are the safety valve set pressure - correct answers- heat absorbed by water when changing from liquid to steam at the boiling point is ______ - correct answers-latent heat to raise the temperature of 1 lb of water from 32°f to 212°f, ________ btu are needed - correct answers- baffles are placed between the tubes of a boiler to _________ - correct answers-direct the travel of gases of combustion in a pressure atomizing fuel oil burner, atomization of fuel oil is produced by the. _________ - correct answers-burner tip and high fuel oil pressure the steam Inlet connections of a condenser should be provided with. _______ - correct answers-an atmospheric relief valve when a hydrostatic test is performed on a boiler, each safety valve should be _____ - correct answers-blanked or gagged in a surface condenser, the cooling water _______ - correct answers-passes through the tubes a bypass damper on an air heater _______ - correct answers-prevent moisture from collecting at low firing rates the minimum size manhole is. ______ - correct answers-11" x 15" the diameter of a chimney may have to be increased. ___________ - correct answers-if the boiler smokes continually stay bolts are generally used on ______ - correct answers-fire tube boilers

before draining a boiler, _______ - correct answers-allow the setting to cool cast iron water columns maybe use for pressures up to ______ psi. - correct answers- 250 all high pressure boilers must have more than one method to determine water level : engaged glass and _______ - correct answers-try cocks if dry saturated steam at 200 PSI is passing through a reducing valve and is reduced to 25 psi, it is ________ - correct answers-superheated three boilers are connected to a common header and each boiler is carrying 100 PSI. The pressure gauge on the header reads. ______ psi - correct answers- _______ is caused by allowing sudden extreme changes of temperature in a furnace - correct answers-spalling _________ is always necessary in the combustion process - correct answers-oxygen water walls should be blown down ______ - correct answers-when the furnace is cool an automatic non-return valve is used with a(n) _________^ - correct answers-boiler feed water is treated chemically before it enters the boiler drum to ________ - correct answers-change scale forming salts to a non adhering sludge