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119 Cards in this Set
- Front
- Back
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One of the first ways to detect a fault in a reciprocating engine is:
a) by sound b) temperature indication c) performance efficiency d) by oil consumption e) by smell |
a) by sound |
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A single device which converts a natural source of energy into mechanical motion is a/an:
a) prime mover b) heat engine c) electric motor d) steam plant e) alternator |
a) prime mover |
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A routine inspection of an operating steam engine should cover first and foremost:
a) lubrications b) drive belts c) engine speed d) steam temperature e) steam quality |
a) lubrications |
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What is the main advantage of using the expansive properties of steam?
a) reliability b) speed of response c) economy d) lower steam pressures can be used e) superheated steam can be used |
c) economy
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A steam engine will have the steam supply to the cylinder shut off once the piston has travelled:
a) 25 to 35% of its stroke b) 75 to 90% of its stroke c) 15 to 20% of its stroke d) 55 to 65% of its stroke e) 90 to 95% of its stroke |
a) 25 to 35% of its stroke |
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Thinking of a steam engine and its construction, what does "eccentric" mean?
a) strange b) out-of-center c) economical d) redundant e) bi-directional |
b) out-of-center |
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Large power plants tend to be of the thermal type because they can burn solid fuels and:
a) they are least expensive to build b) the noise level is much less than internal combustion engines c) the heat cycle they use is the most efficient d) solid fuels are the most plentiful and cheapest e) require the least amount of manpower |
c) the heat cycle they use is the most efficient |
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A steam engine piston:
a) moves fastest at the end of its stroke b) can never have steam applied to either end c) is lubricated from the crankshaft oil by splash method d) moves fastest at the beginning of its stroke e) never requires lubrication |
d) moves fastest at the beginning of its stroke |
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A "prime mover" is:
a) an electric motor b) a steam turbine c) a centrifugal pump d) an air compressor e) a boiler |
b) a steam turbine |
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A gasoline engine is a "heat engine". What is its working fluid?
a) glycol b) gasoline c) air d) glycol/water mixture e) gasoline/air mixture |
e) gasoline/air mixture |
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List the correct five items in the proper order to show a way in which the energy in natural gas can be converted to mechanical energy to pump water.
• alternator • motor • gas energy • boiler • pump • gas engine |
1. gas energy 2. gas engine 3. alternator 4. motor 5. pump 6. boiler |
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Advantages of a steam engine include: (choose all that apply)
[a] it is possible to change the direction of rotation without the use of gearing [b] they have a high rotational speed [c] they are simple and rugged [d] they have a slow rotational speed without the need for reduction gearing |
[a] it is possible to change the direction of rotation without the use of gearing [c] they are simple and rugged [d] they have a slow rotational speed without the need for reduction gearing |
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What 2 things hold a turbines carbon packing rings in place axially? (choose two)
[a] spring pressure [b] the weight of the shaft [c] steam pressure [d] centrifugal pressure |
[a] spring pressure [c] steam pressure |
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What are the two purposes of a turbine condenser? (choose two)
[a] to heat the condensate [b] to increase efficiency [c] to provide a pure source of boiler feedwater [d] to create a vacuum |
[b] to increase efficiency [d] to create a vacuum |
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When warming up a turbine: (choose all that apply)
[a] the turbine condenser is under full vacuum [b] the warm-up is done slowly [c] the turbine is slowly rotated [d] the warm-up must be done so that warping is prevented |
[b] the warm-up is done slowly [c] the turbine is slowly rotated [d] the warm-up must be done so that warping is prevented |
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A steam turbine should trip or shut down when normal operating speed is exceeded by:
a) 250 rpm b) 3 to 5% c) 50 rpm d) 10 to 15% e) 25 rpm |
d) 10 to 15% |
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The turbine overspeed trip: (choose all that apply)
[a] prevents the turbine from vibrating [b] prevents the turbine from exceeding the maximum rated speed [c] is operated by a spring loaded pin in the rotating blades [d] will close the steam stop valve |
[b] prevents the turbine from exceeding the maximum rated speed [d] will close the steam stop valve |
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The great majority of turbine governors are the ____________ type.
a) mechanical b) hydraulic c) mechanical centrifugal d) rotary e) stationary |
c) mechanical centrifugal |
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When preparing a turbine for start, why is it warmed up slowly?
a) to prevent warping b) so that it comes on load gradually c) to prevent water slugging d) so that the vacuum doesn't drop too fast e) to prevent overheating of the feedwater |
a) to prevent warping |
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Shaft sealing carbon glands are:
a) lubricated by the main oil pump b) limited to a temperature of 250˚C c) replaced monthly due to erosion d) self-lubricating e) metal sprayed components |
d) self-lubricating |
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The principle of an impulse turbine is that: (choose all that apply)
[a] the steam pressure is reduced in the stationary nozzles [b] the high velocity steam will impinge upon the blades [c] the steam pressure will drop across the blades [d] the steam pressure is increased through the blades |
[a] the steam pressure is reduced in the stationary nozzles [b] the high velocity steam will impinge upon the blades |
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When the steam pressure drop occurs in only the stationary members or components of a turbine, the turbine is knows as:
a) a single stage unit b) an impulse unit c) a reaction unit d) a Parsons unit e) a cross compound reaction unit |
b) an impulse unit |
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What is the purpose of the nozzles in a turbine?
a) to create a pressure rise b) to lower steam velocities c) to increase steam velocities d) to direct the steam onto the shaft e) to create kinetic momentum |
c) to increase steam velocities |
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How many basic types of turbines are there?
a) 1 b) 2 c) 3 d) 4 e) 5 |
b) 2
note: 1. Reaction 2. Impulse |
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Starting with the boiler in simple power generation cycle, place the following components in the order in which the steam/water flows through the cycle.
• feedwater heater • turbine • condensate pump • boiler feed pump • condenser |
1. turbine 2. condenser 3. condensate pump 4. feedwater heater 5. boiler feed pump |
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What are three advantages of a pressure lubrication system on a turbine? (choose all that apply)
[a] minimal maintenance required [b] reliable service [c] long bearing life [d] less oil is required [e] less power is required |
[a] minimal maintenance required [b] reliable service [c] long bearing life |
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What do the stationary nozzles of an impulse turbine convert the thermal energy of the steam into?
a) mechanical energy b) potential energy c) kinetic energy d) rotational energy e) low velocity steam |
c) kinetic energy |
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For what purpose is lubricating oil required on a turbine, besides lubrication?
a) to seal the shafts b) to maintain vibration free operation c) to carry heat away from the bearings d) to eliminate friction e) to reduce corrosion on the turbine blading |
c) to carry heat away from the bearings |
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The great majority of steam turbine governing systems utilize the:
a) hydraulic system principle b) pneumatic system principle c) mechanical centrifugal principle d) lever principle e) bimetal expansion principle |
c) mechanical centrifugal principle |
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In an impulse turbine:
a) the steam flow is reduced through the nozzles b) the steam pressure is reduced in the nozzles c) the steam pressure will drop across the blades d) the steam velocity is increased through the blades e) the exhaust steam is directed back to the boiler |
b) the steam pressure is reduced in the nozzles |
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The shrouding installed on the blading of a steam turbine serves to:
a) cool the blade tips b) expand the steam c) stop the steam flow d) heat the steam e) confine the steam to the blades |
e) confine the steam to the blades |
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Reaction turbines:
a) have a pressure drop through the stationary and moving blades b) are used for high pressure only c) have a steam velocity increase across the moving blades d) do not need a thrust bearing e) cannot use counterflow staging |
a) have a pressure drop through the stationary and moving blades |
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What gives wood its strength?
a) lignin b) extractives c) cellulose d) the type of wood e) additives |
c) cellulose |
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In a venturi type cooling tower, how is airflow created?
a) by mechanical induction b) by forced draft c) by wind d) by spray nozzles e) by crossflow |
d) by spray nozzles |
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Water treatment is necessary in a cooling tower because of which of the following problems? (choose all that apply)
[a] scaling [b] biological fouling [c] corrosion [d] wood deterioration |
[a] scaling [b] biological fouling [c] corrosion [d] wood deterioration |
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What is used to remove water from the air which exits a cooling tower?
a) baffles b) screen c) drift eliminators d) separators e) absorbers |
c) drift eliminators |
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Scaling is not as sever in towers when compared to boilers because:
a) tower water does not evaporate b) there are not as many dissolved solids in tower water c) pressure is not as high d) temperatures are not as high e) water is constantly being aerated |
d) temperatures are not as high |
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Excessive wind velocity in a natural draft cooling tower may cause:
a) louvers to become broken b) high water drift or losses c) rotational reversal of the fan d) over-cooling of the water e) under-cooling of the water |
b) high water drift or losses |
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Atmospheric tower and chimney towers are the two sub-classes of what type of cooling tower?
a) mechanical draft cooling towers b) induced draft cooling towers c) counterflow cooling towers d) natural draft cooling towers e) forced draft cooling towers |
d) natural draft cooling towers |
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The by-pass valve, which prevents water flow over the fill of a tower during cold weather, should not be closed until the temperature in the water basin reaches:
a) -0.5˚C b) +0.5˚C c) +5˚C d) +20˚C e) +27˚C |
e) +27˚C |
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What makes cooling towers such a good environment for biological growth? (choose all that apply)
[a] a oxygen rich atmosphere [b] warm water [c] abundant shade [d] low pH |
[a] a oxygen rich atmosphere [b] warm water |
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To control scaling in a cooling tower, what should first be done?
a) use a water softener b) add sulphuric acid to the cooling water c) use the bleed-off line d) add chemicals to keep the scale forming salts in solution e) convert the scale forming salts to a soft sludge and remove by blowdown |
c) use the bleed-off line |
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For water temperatures up to 70˚C, corrosion rates in cooling towers:
a) double b) triple c) quadruple d) increase e) decrease |
a) double |
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Which of the following chemicals are environmentally friendly alternatives for providing corrosion prevention in cooling towers? (choose all that apply)
[a] chromates [b] zinc [c] polysilicates [d] molybdates |
[b] zinc [c] polysilicates [d] molybdates |
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Which of the following methods could be used to circulate air in a cooling tower? (choose all that apply)
[a] induced draft fans [b] balanced draft fans [c] natural draft [d] convection currents |
[a] induced draft fans [c] natural draft [d] convection currents |
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What are atmospheric cooling towers dependant on?
a) relative wind velocity b) atmospheric conditions c) relative humidity d) the type of packing used e) the wind direction |
b) atmospheric conditions |
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Basic components of a cooling tower system include: (choose all that apply)
[a] inlet louvers [b] circulating pumps [c] header tank [d] baffles |
[a] inlet louvers |
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How many general methods are there to circulate air in a cooling tower?
a) 1 b) 2 c) 3 d) 4 e) 5 |
b) 2
1. Mechanical 2. Natural |
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Reasons for a noisy motor in a cooling tower include: (choose all that apply)
[a] bad bearings [b] an unbalanced rotor [c] the motor is running single phase [d] electric unbalance |
[a] bad bearings [b] an unbalanced rotor [c] the motor is running single phase [d] electric unbalance |
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What are the two classifications of mechanical draft cooling towers? (choose all that apply)
[a] forced draft [b] mixed draft [c] venturi draft [d] induced draft |
[a] forced draft [d] induced draft |
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In cooling towers, protective films and sacrificial metals are two methods of protecting against what?
a) corrosion b) biological fouling c) scaling d) wood deterioration e) excessive drift |
a) corrosion |
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A car radiator works on the same principle of:
a) forced draft cooling tower b) a dry cooling tower c) an induced draft cooling tower d) an atmospheric cooling tower e) a hyperbolic cooling tower |
b) a dry cooling tower |
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The use of oxidizing chemicals is one of the methods used to protect against biological fouling in cooling towers. Give an example of an oxidizing chemical.
a) chlorinated phenols b) quatemary ammonium slats c) phosphates d) chlorine e) molybdates |
d) chlorine |
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Microorganisms require carbon to develop. Where would they get this carbon from in a cooling tower?
a) from the steel in the structure b) form carbon dioxide entrained in the cooling water c) from the carbon filters which are used to remove odours from the water d) from carbonic acid in the form of acid rain e) from the cellulose in the wood |
e) from the cellulose in the wood |
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What is the purpose of a cooling tower?
a) to reduce the temperature of cooling water b) to cool steam c) to reduce the temperature of boiler blowdown water d) to provide air conditioning e) to reduce the temperature of water before it goes to a cooling pond |
a) to reduce the temperature of cooling water |
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What causes air flow in a hyperbolic cooling tower?
a) convection currents b) a venturi c) induction d) forced draft fans e) prevailing winds |
a) convection currents |
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What is the purpose of the bleed-off line on a cooling tower?
a) to lower the basin level b) to reduce the cooling effect c) to increase the venturi effect d) to reduce the pressure of the water nozzles e) to control the amount of scale forming salts |
e) to control the amount of scale forming salts |
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The rate of heat transfer in a cooling tower system depends on how many factors?
a) 1 b) 2 c) 3 d) 4 d) 5 |
d) 4
* Velocity of air * Surface area of water in contact with air * Duration of contact, between water and air * Difference in inlet water temperature and the relative humidity |
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How many sub-classes of mechanical draft cooling towers are there?
a) 1 b) 2 c) 3 d) 4 e) 5 |
b) 2
* Forced Draft * Induced Draft |
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To prevent cooling tower basin water from freezing during cold weather many units are equipped with:
a) ethylene glycol antifreeze systems b) electric basin heaters c) propane burners d) ice defrosters e) warming tapes |
b) electric basin heaters |
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If the fan motor in a cooling tower runs hot, what could be the cause? (choose all that apply)
[a] a bent motor shaft [b] over greased bearings [c] wrong lubricant [d] undergreasing |
[a] a bent motor shaft [b] over greased bearings [c] wrong lubricant [d] undergreasing |
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In cold climates, ice formation in a cooling tower may be dealt with by: (choose all that apply)
[a] slowing the fans down [b] spraying the unit with glycol [c] reversing the fans [d] reversing the flow of cooling water |
[a] slowing the fans down [c] reversing the fans |
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Atmospheric towers and chimney towers are the two sub-classes of what type of cooling tower?
a) mechanical draft cooling towers b) induced draft cooling towers c) counterflow cooling towers d) natural draft cooling towers e) forced draft cooling towers |
d) natural draft cooling towers |
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A cross-flow mechanical draft cooling tower:
a) may be located below the level of the system it serves b) has a smaller "footprint" c) has higher power requirements d) has a low pressure drop e) does not require free diffusion at the outlet |
d) has a low pressure drop |
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The purpose of a regenerator is:
a) to clean the exhaust gases b) to improve the efficiency of the turbine c) to increase the temperature in the combustion chamber d) to lower the temperature in the combustion chamber e) to recirculate the exhaust gases back through the compressor |
b) to improve the efficiency of the turbine |
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An essential auxiliary in a gas turbine installation is a/an:
a) air heater b) generator c) air dehumidifier d) pump e) starting motor |
e) starting motor |
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A gas turbine is not self-starting. It must be rotated at _________ of its maximum speed before fuel is turned on.
a) 10 to 30% b) 15 to 30% c) 20 to 30% d) 25 to 30% e) 25 to 50% |
d) 25 to 30% |
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Many typical steam plant auxiliaries are eliminated with a gas turbine due to its:
a) small size b) high speed c) high power to weight ratio d) simplicity e) low oil consumption |
d) simplicity |
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The output power of a gas turbine is directly related to the:
a) mass of gas passing through the turbine per second b) temperature at the turbine inlet c) mass of the unit d) slippage between the turbine and compressor e) turbine exhaust temperature |
a) mass of gas passing through the turbine per second |
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Early gas turbines were handicapped by:
a) metal not being able to withstand high speed centrifugal forces b) the inability to get enough air into the combustion chamber c) metals not standing the high temperatures involved d) their high operating speeds e) their inadequate power capacity |
c) metals not standing the high temperatures involved |
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The different methods of starting a gas turbine are: (choose all that apply)
[a] sequential [b] manual [c] semi-automatic [d] automatic |
[b] manual [c] semi-automatic [d] automatic |
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Some of the characteristics, which make the gas turbine a better choice over the other prime movers, are: (choose all that apply)
[a] low maintenance [b] minimum cooling water [c] high thermal efficiency [d] rapid start-up and loading |
[a] low maintenance [b] minimum cooling water [d] rapid start-up and loading |
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A two shaft turbine:
a) has the load (or free) turbine downstream from the compressor b) has the first turbine drive the prop on a turbo-prop engine c) is always an open cycle type d) is always a closed cycle type e) does not require a starting motor |
a) has the load (or free) turbine downstream from the compressor |
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A gas turbine performs most effectively if:
a) lube oil is of the proper viscosity b) cooling water temperature is kept low c) ambient air temperature is high d) ambient air temperature is low e) loaded immediately after starting |
d) ambient air temperature is low |
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A gas turbine which has been in service for 5000 hours will see its power output drop by approximately how much?
a) 0.5% b) 1.0% c) 1.5% d) 2.0% e) 2.5% |
e) 2.5% |
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How many different gas turbine starting methods are there?
a) 1 b) 2 c) 3 d) 4 e) 5 |
c) 3
1. manual 2. semi-automatic 3. automatic |
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Why are gas turbines prone to high NOx emissions?
a) because of high combustion temperatures and short resident time b) because they use high nitrogen fuels c) minimal cooling water results in higher exhaust temperatures d) because of their low efficiency e) their rapid start up capability does not allow proper warm-up |
a) because of high combustion temperatures and short resident time |
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Dirty air filters on a gas turbine could lead to what alarm?
a) high outlet temperature b) high pressure c) high stator vibration d) high differential pressure, air intake e) overspeed |
d) high differential pressure, air intake |
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The air side of a gas turbine regenerator is located:
a) before the compressor b) after the combustion chamber c) between the turbine and combustion chamber d) between the turbine and atmosphere e) downstream of the compressor |
e) downstream of the compressor |
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The low installation cost of a gas turbine is:
a) due to cheap materials in the blades b) due to short fuel lines c) because no fuel pump is required d) because no electrical wiring is required e) because less auxiliary equipment is needed |
e) because less auxiliary equipment is needed |
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The compressor on a gas turbine:
a) can be driven by the load turbine b) is always of the axial type c) downstream of the turbine d) compresses the fuel required for combustion e) is of the reciprocating style |
a) can be driven by the load turbine |
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The purpose of a spark plug is:
a) to ignite the fuel air mixture in a gasoline engine b) to produce power for the compression stroke c) to prewarm the engine d) to raise the ignition point of the fuel e) to ignite the air in the cylinder |
a) to ignite the fuel air mixture in a gasoline engine |
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The injection pump of a diesel engine is driven by:
a) piston action b) the governor c) the wrist pin d) the gudgeon pin e) the camshaft |
e) the camshaft |
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What causes the piston in a 4-stroke diesel to move downwards in the power stroke?
a) the expansion of the combustion gases b) the burning of the fuel c) centrifugal force d) the momentum of the crankshaft e) the injection of the fuel |
a) the expansion of the combustion gases |
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Large internal combustion engines achieve cooling by use of:
a) water jackets b) evaporation c) air cooling d) condensers e) refrigerants |
a) water jackets |
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How is fuel vaporized in a gasoline engine? (choose all that apply)
[a] a fuel pump [b] an injector [c] a carburetor [d] a vapourizer |
[b] an injector [c] a carburetor |
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A simple 2-stroke spark ignition engine has three ports instead of valves. What are these ports named? (choose all that apply)
[a] intake [b] crossover [c] scavenge [d] exhaust [e] transfer |
[a] intake [d] exhaust [e] transfer |
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What is a fuel's resistance to premature detonation called?
a) octane rating b) knock c) detonation resistance d) cetane number e) benzene level |
a) octane rating |
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What must be done before starting a large diesel engine?
a) check the valve clearance b) change the oil c) prime the fuel injector pump d) warm up the air start motor e) purge the exhaust system |
c) prime the fuel injector pump |
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What is the purpose of a push rod in a typical 4-stroke diesel engine?
a) to operate a rocker arm b) to inject fuel into the cylinder c) to pump oil d) to operate the fuel pump e) to open or close cooling passages |
a) to operate a rocker arm |
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What is a diesel engine's camshaft driven by?
a) gears b) a chain c) the crankshaft d) pushrods e) an air motor |
c) the crankshaft |
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A 4-stroke spark ignition engine:
a) operates best at high revolutions per minute b) has now power stroke every revolution c) has low torque at low speeds d) theoretically has half the power of a 2-stroke engine of the same size and speed e) has poorer cylinder scavenging than a 2-stroke engine |
d) theoretically has half the power of a 2-stroke engine of the same size and speed |
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An example of an engine which gives high torque at low speeds would be that of a:
a) chain saw b) two cycle snowmobile c) four stroke motocross motorcycle d) two cycle lawnmower e) two cycle transit bus |
c) four stroke motocross motorcycle |
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A two cycle gasoline engine:
a) has more moving parts than a four cycle b) produces twice as much power as a four cycle c) must have two cylinders d) does not require exhaust valves or ports e) is of more simple construction than a four cycle |
e) is of more simple construction than a four cycle |
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Ignition in a diesel engine is started by:
a) a glow plug b) a spark plug c) a starter motor d) compression in the cylinder e) air injection |
d) compression in the cylinder |
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In which ways might a diesel engine be started? (choose all that apply)
[a] hand cranking [b] air starter motor [c] electric starter [d] compressed air delivered to cylinders |
[a] hand cranking [b] air starter motor [c] electric starter [d] compressed air delivered to cylinders |
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A major difficulty encountered with a two-stroke cycle engine is:
a) the high torque at low speeds b) maintenance of many moving parts c) the difficulty in cold weather starting d) the high speeds compared to an equivalent four stroke engine e) exhausting the spent gases from the cylinder |
e) exhausting the spent gases from the cylinder |
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An injection nozzle is used to __________ the fuel in a diesel engine.
a) eject b) mix c) ignite d) atomise e) aspirate |
d) atomise |
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Although many new 2-stroke spark ignition engines have oil injection, what method of lubrication is still widely used?
a) a pressure pump b) a pre-mixed oil/gasoline mixture c) drip lubricators d) splash lubrication e) oil rings |
b) a pre-mixed oil/gasoline mixture |
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In larger 2-stroke engines, how is scavenging air provided?
a) with compressed air piped to the cylinders b) with air injectors c) with superchargers d) with an induction stroke e) with scavenge ports |
c) with superchargers |
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Delignification in a cooling tower's wood is a result of:
a. the use of non-oxidizing biocides b. chemicals such as chlorine c. the deterioration of cellulose in the wood d. the use of the iron hardware e. excessive scaling |
b. chemicals such as chlorine |
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A steam turbine's exhaust can often supply a process with steam because
a) processes always require a lower steam pressure |
d) it is free of oil |
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Water contained in the airstream at the discharge of a cooling tower is removed
a) with centrifugal separators |
e) with drift eliminators |
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What is the purpose of a turbine thrust bearing?
a. To oppose the turbine shaft thrust b. To transfer load thrust to the turbine c. To transfer turbine thrust to the load d. To maintain the correct radial position e. to seal the turbine shaft |
a. To oppose the turbine shaft thrus |
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A gas turbine compressor is usually
a) centrifugal type |
c) an axial design |
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In a turbine with a pressure lubrication system, the high pressure oil generally goes to the governor system. Where the low pressure oil goes:
a. to the overspeed trip b. to the bearings c. to the emergency stop valve d. to the rotor e. to the steam supply valve |
b. to the bearing |
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Excessive water drift in a cooling tower coild be the result of drift eliminators being out of place or:
a. the water flow rate is too high b. high winds c. low fan speed d. low basin water level e. high water temperatures |
a. the water flow rate is too high |
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Gas turbines are very popular where
a) noise does not present a problem |
b) water is scarce |
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Impulse turbines:
a. have a velocity drop through the nozzle |
b. have no pressure drop through the moving blades |
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Regarding a combined steam-gas turbine plant, which of the following may apply?
[1] the gas turbine may exhaust to the boiler [2] the air compressor may deliver air to the boiler [3] the boiler may deliver got gases to the gas turbine [4] the compressor may deliver hot gases to the gas turbine
a. 1,3 b. 2,3,4 c. 1,2 d. 1,2,3 e. 2,4 |
d. 1,2, |
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A gas turbine:
[1] is a heat engine [2] is a prime mover [3] heats compressed air [4] contains impulse and/or reaction blading
a. 1,3 b. 2,3,4 c. 1,2,3,4 d. 1,2,4 e. 2,4 |
c. 1,2,3,4 |
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The overspeed trip of a steam turbine
a) operates on turbine vibrations due to high speed |
b) is installed on all turbines |
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How are microbiological organisms killed off most effectively in a cooling water system?
a. by temporarily raising the concentration of the chemicals to a high level b. by using multiple biocides c. by injecting the biocides at a low dose d. by injecting chemicals once per month e. by constantly changing chemicals
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a. by temporarily raising the concentration of the chemicals to a high leve |
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What fire extinguishing media are fitted in a gas turbine automatic fire fighting system?
[1] dry chemical [2] halon [3] water [4] carbon dioxide
a. 1,4 b. 2 c. 3,4 d. 2,4 e. 1,2,4
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d. 2,4 |
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What effect would a reduction in air density have on a gas turbine?
a. no effect b. power output would be reduced c. efficiency would increase d. power output would increase e. turbine inlet temperature would increase |
b. power output would be reduce |
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What are trash bars and chemical methods used to protect a cooling tower against?
a. scaling b. biological fouling c. corrosion d. wood decay e. low heat transfer |
b. biological fouling |
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Which of the following are advantages of venturi towers?
[1] no fill is required [2] no fan is required [3] it is quiet [4] reduced maintenance requirements
a. 1,2 b. 1,2,3 c. 2,3,4 d. 1,2,3,4 e. 2,4 |
d. 1,2,3,4 |
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What type of rotors are used in large steam turbines?
a. impulse b. reaction c. impulse and reaction d. reaction and cross-flow e. impulse and condensing |
c. impulse and reaction |
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If a gas turbine operates on natural gas, what may be required.
a. volumetric pumps b. gas compressor c. fuel conditioners d. gas driers e. injetors |
b. gas compresso |
