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State Exams > State Exam > Flashcards

State Exam Flashcards

1
Q

Lists three scale forming compounds and type of scale (hard, soft, and insoluble

A

Calcium, magnesium, silica. Hard, soft, and insoluble

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2
Q

True or false. A synchroscope compares the generator waveform to the grids waveform by measuring the fase angle between the two,

A

True

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3
Q

What are some causes of pitting and corrosion ?

A

Acid, high alkalinity and oxygen

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4
Q

How do you determine super heater safety valve ?

A

Super heater safety valve must discharge all steam it can generate with out going over 6% of MAWP. If super heater can be isolated safety valve have capacity of 6 pounds for each square foot of super heater heating surface. It must blow first to maintain flow through.

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5
Q

During rounds of a large generating station you notice the thrusy bearing temperature has increased from its normal temoerature of 130F to 145F. All other parts of turbine seem normal . Isthere a problem? What do you do?

A

Check oil lube level, check oil lube oil quality, increase cooling water flow

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6
Q

How do you adjust radial clearnance on a turbine.

A

Need to remove journal and have multipe shims, adjust clearance, measure, reattach journal bearing

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7
Q

A flue gas analysis showed 15% co2 and 5% o2 by volume what is the excess air?

A

o2/.263-o2
.05/.263-.05=23.4%
The DPSuses 3% o2 as 15% excess air
so 5%=1.67x15=25%

5/3=1.67

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8
Q

What are the symbols in ohms law repesent ? E=IR

A

E= voltage I= Curent R= resistance

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9
Q

What pressure is a blank cover plate good to (in place during hydro) The dimensions and strenth of plate was given

A

the formular is to solve T-D/CP/S

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10
Q

Explain a zeolite softner process?

A

The purpose of a sodium zeolite water softner is to remove scale forming calcium and magnesium ions and replace them with non-scale forming ions. It operates by passing the incomming water through zeolite bed charged with sodium ions which removes calcium and magnesium ions in the water.

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11
Q

What is an accumulation test and when should it be preformed?

A

It is a way of calculating the reliving capacity of the safety valve.
under full firing conditions, feedwater shutoff stop valves closed except for neccesary aux equipment

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12
Q

What is the maxium carbon that can be in boiler pressure parts ?

A

0.35%

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13
Q

When steam passes through a PRV what happens to the temperature, pressure, entropy, enthalpy, and super heat?

A

Temp goes down, enthalpy the same, pressure reduced, entropy increases, super heat increases

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14
Q

What flue gas are measured to control pollution instead of combustion?

A

SO2, NOX

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15
Q

Name the parts of make up a large surface condencer?

A

Exhaust nozzle, shell, water box, tube sheet,reinforcement plates, tubes, hotwell

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16
Q

Name sever causes of turbine vibrations?

A

critical speed, broken eroded or coroded blades, bent shaft, water comming over with steam,internal rubbing, worn thrust bearing, incorrect clearance, over heating due to cooling lube

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17
Q

What is a gland water seal how does it work?

A

The water seal consists of an impeller on the turbine shaft which rotates in water filled casting and water thrown out from impeller forms a leak proof water barrier. Water seals are mainly applied to LP glands to guard against air leaking in. They do not operate properly at low speeds,

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18
Q

What is specific heat of steam, oil, air ?

A

steam .50, oil .40 to .47, and air .24

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19
Q

How do you know when a shell and tube feedwater heater is leaking in the tubes?

A

Rise in conductive increase in water usage

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20
Q

What is heading on state log?

A

I i the Engineer log book heading, type of boiler, allowable working pressure, safety valve setting, and date engineers fills in date , time in, time out, reviewed operators state log, notes of boiler and turbine operations as well as repairs and or visits by insurance or state inspections, along with signature and license number.
In the operators log book heading address, type of boiler, allowable working pressure, safety valve setting, and date. Operator fills in date, time, continous blowdown, safety valve manual test. aux equipment checked, boiler ignition verified, boiler room cleaned, internal conditions if opened, operator notes, signature and license number.

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21
Q

What is active and inactive pitting?

A

Active is still taking place and is shiney, inactive pitting took place in the past

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22
Q

What is a dummy micrometer used for ?

A

It is used for measuring the clearance in steam turbine.

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23
Q

What is the purpose of sentinel valve ?

A

Asentinel valve is use on small turbine to warn the operator of problem, most likely backpressure.

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24
Q

What is plastic refractory and where is it used?

A

Used around the burner through and curved areas, Used to protect the furnace walls.

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25
Q

How do you obtain the horsepower of an electric boiler?

A

The relieving capacity is 3.5 pounds per KW.
Relieving capacity / 34.5 ?
If given kw/hr, multiply by 1.34.

If given HP then multiply by .76

26
Q

What happens to latent heat when the pressure increases?

A

It decreases

27
Q

The ph rises from 9 to 11 hoe much has it raised ?

A

It increases by a factor of 10 so it is 1000 times moore.

28
Q

Is a qualified welder able to preform any repair on boiler ?

A

The company doing the repair must have R stamp. The welder must be certified for the type, material, thickness and filler material.

29
Q

How many safety valves are required and what is the minimum relieving capacity of a 510 KW electric boiler ?

A

one safety valve under 1100 KW.
3.5 LBS PER KW/HR
1785 lbs/hr

30
Q

Where is the greatest pressure in the boiler ?

A

watertube=steamdrum

firetube= supports stays in furnace

31
Q

What is the purpose of the following pertaining to water treatment ?
sodium sufite
sodium hydroxide
sodium chloride zeolite

A

sodium sulfite=oxygen scavenger
sodium hydroxide= ph control
sodium chloride zeolitr= ion exchange calcium and magnesium to sodium ions

32
Q

Give 5 reasons why a condenser slowly losses vaccume

A

Loss of cooling water pressure, high cooling water temp, loss of gland steam, leaks on pipe Flangers, leaking around rupture disc

33
Q

According to state what are the duties of engineer in charge ?

A

Ensure all operators are duly licensed, ensure all license are properly posted, ensure all operators are trained , ensure all operators are protected from all know hazards, provide daily instructions, ensure all log books are completed ensure no boilers are operated without certificates of inspection.

34
Q

What is a bomb calorimeter and how is it used?

A

A device for determine heat value

35
Q

What is the code requirements for blowdown piping on a boiler operating at 150psi?

A

The blowdown piping when the MAWP exceeds 100 psi shall include two valves the minimum pipe size 1 inch and the max is 2.5

36
Q

When the throttle temperature on a turbine is to low what effect will it have on turbine?

A

Increased moisture , blade erosion

37
Q

A tank has two pumps one will empty in 5 hours the other in 6 hours,how long will it take if both pumps run?

A 
1/5+1/6
.20+.17=.37
1/.37=2.7 hours
60x.70=42.       
2 hours 42 min
38
Q

A boiler is rated for 150,000 pounds per hour delivers only 135,000 per hour list 4 possible causes .

A

broken baffle, high excess air, diry fire side, dirty water side

39
Q

What is meant by critical speed ?

A

Critical speed is when moving parts reach its harmonic frequency. This is the point where the rotor will shake violently and aventually and eventually tear apart if left unattended

40
Q

A gallon of fuel weights 7,986 pounds at 60 degrees. Given the weight of 1 gallon of water as 8.328 pounds at the same temperature, what is the specific gravity of oil ?

A

7.986/8.328=sg of .95

41
Q

What is the purpose of the blow down tank and what pipe connections are required?

A

It tempers the boiler water to the max temp allowed to sewer . Cooling water inlet, drain, vent and bypass.

42
Q

When warming up a turbine, should the vaccume be high or low and why ?

A

High, to reduce back pressure and keep exhaust teperatures low.

43
Q

The main diameter of blades on turbine rotor turning 400 rpm is 48 inches what is relation of steam velocity to blade velocity on the assumption that steam flow has a velocity 11,600 feet per minutethrough rotor.

A

roughly 1 to 1/2

44
Q

A boiler generates 5,000,000 pounds of steam per day and 5% of this passes through a continous blowdown valve. What is pounds of water blown out of boiler and what would be the total heat loss in btu’s when the temp is 400 degrees?

A

5,000,000x .05x368=92,000,000

45
Q

Which end of turbine is free to expand, high pressure or low pressure end?

A

high pressure by sliding feet

46
Q

What happens to the latent heat with a change in pressure?

A

latent heat decreases

47
Q

How would you know when a large turbine is warmed up ?

A

turbine is at operating temperature and absolute expansion has stoped.

48
Q

Describe (3) methods of identifying overheated bearings?

A

smell, tourch. sound

49
Q

What is a boiler horsepower? How is it differ from turbine horsepower explain.

A

boiler horsepower 33,475 btu’s

turbine horsepower Ws(h1-h2)/2545

50
Q

What is a boiler vortex eliminator where would it be located in boiler?

A

it is shaped like a cross it is in the drain to prevent overheating so that the pipe is full not just the outside.

51
Q

What is steam boiler under ASME code as far as pressure and temp ?

A

A steam boiler that operates at a pressure higher than 15 psig or hot water boiler that operates at a temperature greater than 250 F or pressure greater than 160 psig

52
Q

What is combustion?

A

A chemical process in which a combustible unites with oxygen producing heat and often light

53
Q

Who can be in charge be in charge of a second class plant ?

A

A 1st class Engineer or a 2nd class Engineer

54
Q

Name 4 turbine trips ?

A

low oil pressure, low vaccume, high vibrations, thrust bearing wear high temp

55
Q

What is the end point on a circulation process ?

A

Is the point at which there is insufficient flow causing overheating of the tubes and eventually tube failure.

56
Q

What is a reinforcement weld ?

A

The amount of weld above the surface of plate on the face side. This ensures full penetration of the thickness of the plate to be joined.

57
Q

What is galvanic corrosion and how is it prevented?

A

Galvanic corrosion when two dissmilar metals are in an electrolytic solution causing a electrical potential to develop and to cause the erosion of one of the metals. To correct use a sacrifical cathode.

58
Q

Calculate the combustion air required for 10% carbon, 5% oxygen, and 3% sulfur?

A

11.53 x .10 (C) + 34.56 X (H-O/8) + 4.32 X .03 = lbs of air required.

59
Q

What is an adiabatic process and where does it take place in a power plant ?

A

It is a process which there is no heat added or taken away from the process. Steam passing bthrough an orifice

60
Q

A boiler generates 10,000lbs of steam per hour and a factor of evaporation of 1.24 what is developed horse power?

A 
DBHP = Ws x F.E. / 34.5
DBHP = 10,000 X 1.24 / 34.5
DBHP = 359.42

State Exams (1 decks)

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