High Pressure Black Steam Review (230 Questions) Flashcards
1
Q
“On a condensing steam turbine, what kind of relief valves is used?”
A
Atmospheric relief valves
2
Q
A steam turbine exhaust end and condenser are prevented from excess pressure by ________?
A
Atmospheric relief valve
3
Q
A steam turbine trips at 3960 RPM. It operating speed is _______.
A
3600
4
Q
In a surface condenser, what happens to the cooling water?
A
Water is in the tube and exhaust steam flows around the tubes
5
Q
Name the two type of governors controls:
A
Mechanical & hydraulic
6
Q
On a turbine driven feedwater pump, identify which two pipes are larger.
A
turbine steam exhaust and pump suction line
7
Q
The overspeed trip operates at _____% of the operating speed.
A
110
8
Q
The vacuum on the exhaust side of the turbine __________.
A
Reduces back pressure and water rate
9
Q
What is the critical speed of a turbine?
A
Point of severe vibration
10
Q
What is the function of a vent condenser on a deaerating feedwater heater?
A
to condense steam that would escape through the vent
11
Q
What is the purpose of a governor on a steam generator?
A
Control the maximum speed of the turbine
12
Q
What is the stationary passage of an impulse turbine called?
A
nozzle
13
Q
What protects the turbine shaft from distortion?
A
Turning gear
14
Q
What type of bearing maintains the horizontal position of the rotor?
A
Axial bearing
15
Q
What type of bearing maintains the vertical position of the rotor?
A
Radial bearing
16
Q
What type of turbine allows condensate to be reclaimed?
A
A condensing turbine
17
Q
When do you power up the auxiliary lubricating oil pump for a turbine?
A
Before prime mover is started up
18
Q
When is the overspeed trip on a turbine tested?
A
At startup
19
Q
Where will you find an atmospheric relief valve?
A
on the inlet piping leading to the surface condenser
20
Q
Which device would be found on the inlet line of a steam turbine condenser?
A
Atmospheric relief valve
21
Q
Which of the following best describes the operation of a surface condenser?
A
cooling water passes through the tubes surrounded by exhaust steam
22
Q
Which of these describes a sentinel valve?
A
Alerts the operator of over pressured conditions
23
Q
“Besides calcium and silica, what could also cause scaling?”
A
magnesium
24
Q
“Iron, calcium, and magnesium could be best best used to describe?”
A
scale
25
"Other than calcium and silica, what is another scale constituent found in boiler?"
magnesium
26
"Other than hydrazine, what else can be used as an oxygen scavenger?"
sodium sulfite
27
"When performing a hardness test, what PPM of hardness would be considered satisfactory?"
0 PPM
28
Deaerating heaters are typically located?
above the main feedwater pump.
29
External water treatment can be accomplished with the use of?
lime soda and sodium
30
Free oxygen found in feedwater would most likely cause?
pitting
31
Noncondensible gases found in feedwater would most likely cause?
channeling
32
Surface tension is caused by?
impurities floating on top of the water inside the steam drum.
33
The deaerating feedwater heater could be compared to?
an open feedwater heater
34
The deaerator should?
remove O2 and CO2 from the feedwater
35
The formation and collapsing of steam bubbles in the feedwater pump would be considered?
cavitation
36
Two methods used to remove scale from a boiler would be?
chemically and mechanically.
37
Water in the most purist state could be defined as?
condensate
38
Water that has a pH reading of 11 would most likely be considered what type of water?
alkali
39
What are the two primary functions of feedwater heaters?
to increase feedwater temperature to improve efficiency and reduce thermal shock.
40
What chemical should be added to the boiler feedwater to prevent oxidation and pitting?
sodium sulfite
41
What device removes oxygen from the boiler water?
open feedwater heater
42
What else can be used as an oxygen scavenger besides sodium sulfite?
hydrazine
43
What is the purpose of a vent condenser on a deaerating heater?
to condense steam that escapes from the vent.
44
What is the purpose of the deaerator?
removes air from the feedwater.
45
What size boilers would require the need for demineralized water?
high pressure boilers over 1000 psi.
46
What two ingredients are oxygen scavengers?
sodium sulfite and hydrazine
47
What will cause pitting of the boiler metal?
oxygen
48
What would be considered to be an optimum temperature for a water sample?
70F - 90F
49
Where is caustic embrittlement most likely to occur?
on riveted joint just below the waterline.
50
Where should sodium sulfate be added to a boiler for maximum efficiency?
the economizer
51
Where would be the most efficient place to introduce sodium sulfite?
"open feedwater heater, deaerator storage tank, closed feedwater heater."
52
Where would you introduce sodium sulfite?
feedwater tank
53
"A boiler generates 125,000 lbs of steam per hour, at a pressure of 420 psi. The heat content of the steam is 1205.6 btu/lb. The feed water temperature is 190 degrees F. What is the developed boiler horsepower?"
3911.59 (3912)
54
"A boiler generates 125,000 lbs of steam per hour, at a pressure of 420 psi. The heat content of the steam is 1205.6 btu/lb. The feed water temperature is 190 degrees F. What is the factor of evaporation"
1.0796
55
"A boiler generates 2,000 lbs of steam per hour, at a pressure of 15 psi. The heat content of the steam is 1164.4 btu/lb. The feed water temperature is 215 degrees F. What is the factor of evaporation"
1.0114
56
"A boiler generates 2,000 lbs of steam per hour, at a pressure of 15 psi. The heat content of the steam is 1164.4 btu/lb. The feed water temperature is 215 degrees F. What is the the developed boiler horsepower?"
58.63 (59)
57
"A boiler generates 225,000 lbs of steam per hour, at a pressure of 170 psi. The heat content of the steam is 1198.3 btu/lb. The feed water temperature is 200 degrees F. What is the factor of evaporation"
1.0618
58
"A boiler generates 625,000 lbs of steam per hour, at a pressure of 440 psi. The heat content of the steam is 1205.6 btu/lb. The feed water temperature is 238 degrees F. What is the rated boiler horsepower?"
"18,115.94 (18,116) "
59
"A boiler generates 65,000 lbs of steam per hour, at a pressure of 350 psi. The heat content of the steam is 1200 btu/lb. The feed water temperature is 210 degrees F. What is the developed boiler horsepower?"
1984.2 (1984)
60
"A boiler generates 75,000 lbs of steam per hour, at a pressure of 350 psi. The heat content of the steam is 1205.3 btu/lb. The feed water temperature is 210 degrees F. What is the rated boiler horsepower?"
2173.91 (2174)
61
"What is the boiler horsepower of a fire tube boiler that has 13,225 square feet of heating surface? "
1102 bhp
62
"What is the boiler horsepower of a fire tube boiler that has 23,635 square feet of heating surface? "
1969.5 bhp
63
2545 Btu s represents?
1 horsepower-hour
64
A boiler with a steaming capacity of 27, 117 lbs/hr would be rated at how many boiler horsepower?
780
65
How much horsepower is in one kilowatt?
1.341
66
The speed of a synchronous motor can be calculated by which formula?
RPM = F x 120 / P
67
What is the correction factor for hydro static pressure?
0.433 PSI per vertical foot
68
What is the formula for finding horsepower in a kilowatt?
HP = 1.341 x kilowatts
69
What is the formula for finding hydrostatic pressure?
H = V × 0.433
70
What is the formula for finding the developed IHP for a steam pump?
"PLAN / 33,000"
71
What is the formula for Ohm's law?
electromagnetic force = current x resistance
72
What is the heating surface of 2 fire tube boilers with 72 2 ¼ tubes that are 10 feet long with a wall thickness of .125 ?
753.98 sq ft
73
What is the heating surface of a fire tube boiler that has 112 3 ¼ tubes that are 96 inches long with a 1/16 wall thickness?
733 sq ft
74
What is the heating surface of a fire tube boiler that has 85 - 2 ½ tubes that are 114 inches long with a 3/16 wall thickness?
449 sq ft
75
What is the heating surface of a water tube boiler that has 216 2 ¾ tubes that are 176 inches long with a .0625 wall thickness?
2281 sq ft
76
What is the heating surface of a water tube boiler that has 325 2 tubes that are 9 feet long with a 1/8 wall thickness?
1531.53 sq ft
77
What unit of measurement is electrical current measured in?
amperes
78
"An arrangement of the return pipe of a low pressure boiler in the form of a loop so the water in the boiler can not e forced out below the safe water level, is referred to as ____."
a Hartford loop
79
"If a flame failure occurs, the operator must _______"
"Secure the fuel source, purge the firebox and shut down"
80
"If you have three boilers running at 100 psi each, what would the pressure on the main header be?"
100 psi
81
"In a 2-pipe gravity return type system, which device is most commonly used to ensure condensate returning to the boiler."
A return trap
82
"In the event of an ignition failure, what control would operate"
Flame scanner
83
"The quantity of heat required to raise one pound of water 1° F, equivalent to 252 calories is referred to as A(n) ____."
Btu
84
"Three boiler water scaling elements are calcium, silica and _________."
Magnesium
85
"What class of fire is it if caused by gas, oil or grease?"
B
86
"When cooling down a boiler, what must the boiler operator must maintain?"
NOWL
87
A flame scanner is sensitive to _______.
infrared rays
88
A form of metal failure that occurs in steam boilers at tube ends and riveted joints is called?
Caustic Embittlement
89
A furnace explosion is more likely to be caused by _______.
accumulation of fuel vapors
90
A low pressure steam boiler safety valve setting must not exceed _______
15 PSI
91
A neutral solution is _______ on the pH scale.
7
92
A pressure gauge is calibrated in pounds _______.
per square inch
93
A thermostatic expansion valves main function is to ____.
Remove air and condensate without steam loss
94
A vacuum gauge is calibrated in _________
inches of mercury below atmospheric pressure
95
A vaporstat is sensitive to?
Pressure
96
Ambient air is ____.
The temperature the boiler must be before firing
97
An aquastat is controlled by _______
water temperature
98
Boilers that are out of service a long period of time can be _____.
Laid up wet or dry
99
Cast iron sectional boiler are designed for what type of draft system.
Mechanical forced
100
Flame failure controls prevent ________
Furnace explosions
101
How are tube sheet supported in a fire tube boiler?
Stay and staybolts
102
How often should a low water fuel cutoff be blown down
Daily
103
How do you clean a re-tubed or newly installed boiler?
With a high pressure water washer
104
On a hot water heating systems the water temperature gauge indicates the ___ water temperature
boiler outlet
105
Oxygen in a boiler causes _______
pitting
106
Pitting of boiler metal is caused by _________
Oxygen in the boiler
107
Safety valve are designed to ____.
Pop open
108
The __________ has a responsibility to report any accidents.
person(s) involved
109
The boiler operator should _________ if the low water alarm sounds.
secure the fire
110
The difference between the pressure at which a safety valve opens (popping pressure/ set point) and the pressure at which it closes is referred to as?
Blowback
111
The height of a chimney has more effect on a _____.
natural draft system
112
The only type of valve allowed between the boiler shell and a safety valve is?
No valve is permitted in this position
113
Three ingredients needed to start a fire are _______.
"heat, fuel, and oxygen"
114
What can be done to assist in removing oxygen from boiler water.
Heating the feed water
115
What carry over can lead to?
Water hammer
116
What chemical would control alkalinity in boiler feed water?
Caustic soda
117
What is the first check the operator must do when taking over a shift?
The boiler water levels
118
What is the maximum size of a surface blow down line.
2 1/2"
119
What is the maximum temperature on a low pressure heating boiler.
250° F
120
What is the purpose of a flame scanner?
Prove pilot ignition
121
What is the purpose of an On / Off pressure control?
Start and stop the burner by steam pressure demand
122
What is the purpose of the low water fuel cut-off?
Shut off the fuel supply
123
What must an operator do to protect against a furnace explosion?
Purge the boiler after every flame failure
124
What part of the safety valve ensures the valve seating properly?
Guides and bushings
125
What section of the ASME code pertains to the care and operation of boilers?
VI
126
What type of draft system has the has a fan located between the boiler and the chimney or stack.
Induced
127
What type of draft utilizes the height of the chimney to determine the amount of draft?
Natural
128
What type of valve is used as a main steam stop valve?
OS&Y valve
129
What type of valve must be used between the boiler and the safety valve?
No valve
130
What type of valve offers the least resistance to flow?
OS&Y valve
131
When you prepare for an inspection the boiler must be.
"Off line cool, opened, and clean on both the fire and water sides."
132
Which fuel oil has the highest heating value?
6
133
Which of the following is one of the most common problems of a hot water system?
Air
134
Why is boiler water chemically treated?
To prevent scale from forming, carryover, & Oxygen pitting
135
With a rotary cup burner the atomization of fuel is accomplished by
primary air and the rotary cup
136
You are running 1 centrifugal condensate pump. You turn on a second parallel pump. What would happen to the condensate water?
"Flow increase, pressure constant"
137
______ pressure is water pressure per vertical foot exerted at the base of a column of water.
Hydrostatic
138
__________ direct the flow of hot water supplied to and returned from the heating units.
Diverterfittings
139
A __________ prevents natural circulation when hot water is not being pumped through the forced circulation hot water system.
flow control valve
140
A flow control valve functions similarly to a(n)_____ valve to prevent natural water circulation.
check
141
A hot water boiler relief valve is rated in _____ relieved per hour.
BTU
142
A hot water heating system operates at ______ the steam heating system.
a lower temperature than
143
A pressure reducing valve reduces the pressure of city water to approximately ______ psi.
12 to 18
144
A relief valve must be built according to the ________.
ASME Code
145
A steam boiler safety valve is rated in _______ relieved per hour.
pounds of steam
146
A typical heating system operates at temperatures above ____°F.
212
147
A(n) _____ allows bleeding of trapped air in a heating unit.
Air Vent
148
Hot water boilers can be ____ boilers.
Firetube, Watertube & Cast iron sectional
149
Hot water boilers operating with a 250°F water temperature and ______ psi water pressure or less are classified as low pressure
160
150
If the compression tank is allowed to fill with water, pressure will increase, causing the ___________.
relief valve to open
151
In a natural circulation hot water system, the _____ functions as a relief valve.
expansion tank
152
In a remote temperature monitoring system, the burner is controlled based on ________.
outside air temperatures
153
Section VI of the ASME Code recommends relief valves be manually tested ______.
every 30 days
154
Some compression tanks are equipped with a _______ for determining the compression tank water level.
gaugeglass
155
Steam boiler are classified as "high pressure" if steam pressure exceeds ______ psi.
15
156
The _______ controls the starting and stopping of the burner by sensing the temperature in the hot water boiler.
aqua-stat
157
The relieving pressure of a relief valve on a low pressure hot water boiler cannot exceed ______ psi,
160
158
The temperature pressure gauge indicates the temperature and pressure of the water ______.
leaving the boiler
159
The two types of low water cutoffs normally used on hot water boilers are the _____ type and the probe type cutoffs.
Float
160
"If two similar centrifugal pumps were connected in parallel, there would be ________."
Flow increase and constant pressure
161
"In a reciprocating feedwater pump, ________."
The steam piston is larger than the water piston
162
"On a turbine driven feedwater pump, which piping is larger?"
Turbine steam exhaust and pump suction lines
163
"What device is used to check for breakdowns on coils, motors, generators, and relays?"
megohmmeters
164
2545 Btu s represents?
1 horsepower-hour
165
A duplex reciprocating pump operates on the principle that ________.
The steam piston must be 2 to 2.5 times larger in area than the water piston
166
A steam-driven reciprocating pump is a ________ pump.
Positive displacement
167
A three stage feedwater pump operates on the principle of ________.
Pressure increase and volume remains the same
168
How much horsepower is in one kilowatt?
1.341
169
The speed of a synchronous motor can be calculated by which formula?
RPM = F x 120 / P
170
What are the main components of a generator?
mutator, frame, armature, brushes"
171
What causes a feed water pump to become steambound?
Feed water temperature too high
172
What is a labyrinth ring?
Prevents leakage
173
What is the correction factor for hydrostatic pressure?
0.433 PSI per vertical foot
174
What is the developed horsepower in a steam pump cylinder 8 x 12 with fifty strokes per minute and a steam pressure of 100 PSI?
91.38 HP
175
What is the formula for finding horsepower in a kilowatt?
HP = 1.341 x kilowatts
176
What is the formula for finding hydrostatic pressure?
H = V × 0.433
177
What is the formula for finding the developed IHP for a steam pump?
"PLAN / 33,000"
178
What is the formula for Ohm s law?
electromagnetic force = current x resistance
179
What is the main character of an induction motor?
where the rotors of induction turn at a speed slower than the speed of rotation.
180
What is the main purpose of a reostat?
vary power factor
181
What is the most likely cause when a feedwater pump becomes vapor bound?
Water temperature is too high
182
What is used to convert electrical energy into mechanical energy?
motor
183
What unit of measurement is electrical current measured in?
amperes
184
Which of the following formulas would be used to find the frequency of a generator?
F = P x RPM / 120
185
Which of the following statements would best describe the function of a synchronous motor?
"starts on AC, operates on AC and DC."
186
"In steam piping, which type of steam trap has no moving parts?"
Continuous flow type
187
A ___ steam trap is a trap that has a bellows with a fluid that boils at steam temperature.
thermostatic
188
A ___ steam trap that has a ball float that opens and closes a discharge valve depending on the amount of condensate in the chamber.
float thermostatic
189
A ___ steam trap that has a single movable disc that raises to allow the discharge of air and cool condensate.
thermodynamic
190
A thermostatic trap opens when __________.
Bellows contract
191
A(n) ____ is a boiler accessory that is located in the steam line before a steam trap to remove foreign matter from steam that could cause a steam trap failure.
steam strainer
192
A(n)___ steam trap in which steam enters the bottom and flows into an inverted bucket.
inverted bucket
193
How would you know that a steam trap is letting steam blow by?
By checking the temperature of the outlet of the trap
194
Steam traps blowing through will _____________.
Blow steam from the vent of condensate tank
195
What device removes oxygen from boiling water?
Open feedwater heater
196
What would happen if the float in your steam trap got a hole in it?
Condensate would back up
197
What is the name of the simple power cycle?
Rankine Cycle
198
With a high-pressure license, you can be the Chief Engineer of a plant up to what size?
up to 500 horsepower
199
On a turbine driven feedwater pump, which piping is larger?
turbine steam exhaust and pump suction lines
200
In the state of NJ, safety valves on high pressure boilers should be tested by hand how often?
Monthly
201
What would best describe the operation of a closed feedwater heater?
steam and water do not mix
202
What part of a safety valve is used to ensure the valve seats properly?
guides and bushings
203
The heat absorbed by boiler water when changing from liquid to steam is?
latent heat
204
How many BTU’s in a therm of gas?
100,000
205
Water hammer in a steam plant is dangerous because it can lead to?
steam piping failure
206
What is the most likely cause of a feedwater pump becoming vapor bound?
boiler feedwater is too hot
207
In a hydrostatic test, what should be done with the safety valves?
it should be held to its seat with a testing clamp
208
When testing a safety valve, there must be ____% of popping pressure
75%
209
What would cause a gradual increase in stack temperature?
heating surface fouling
210
Which stack gas reading would show good combustion?
low oxygen and carbon monoxide, high carbon dioxide
211
Saturated Steam is defined as:
Steam at a temperature corresponding to its pressure
212
What two elements in fuel oil produce most of its heat?
carbon and hydrogen
213
A two element feedwater regulator is controlled by?
water level and steam flow rate
214
The range of a pressure gauge should be ____ times the MAWP of the boiler.
1 ½
215
If your boiler needs welded repairs, you must get approval for such repairs from the?
authorized inspection agency
216
Which of the following best defines the ratio of the total heat supplied by the fuel to the total heat absorbed by the boiler water?
thermal efficiency
217
Which of the following is the proper method for testing a low water cutoff device on a steam boiler?
lower the water level in the boiler until the burner shuts down
218
In the state of NJ, when is it permissible to have only one bottom blowdown valve on a boiler?
when the MAWP does not exceed 100 psi
219
The maintenance of automatic direct fired boilers is covered under what document?
ASME CSD-1
220
Where in the NJ Administrative Code (NJAC) are the duties of a licensed person established?
NJAC 12:90 3.10
221
The various license classifications and grades for operating high pressure boilers are found in the NJAC reference section listed as:
Table 3.4
222
What is the proper procedure for returning a gauge glass to service, after installing a new glass?
open the drain and crack open the top valve
223
What ASME code symbol is used to denote a high pressure power boiler?
S
224
Which is the act that a Mechanical Inspection Bureau exists in NJ?
The New Jersey Stature Annotated (NJSA) 34:1-38.1
225
What is the max penalty that may be imposed for performing the duties of a licensed operator with an expired license?
$5,000
226
What is the regulation corresponding to boiler, pressure vessels and refrigeration systems in NJ?
NJ Administrative Code (NJAC) 12:90
227
An applicant for an engineer's license may upon prior request be examined through a reader or interpreter who may accompany the applicant, provided the reader is accepted to the mechanical inspection bureau of boiler and pressure vessel compliance?
False, An Interpreter can Only be used for a Low Pressure Boiler Operator exam
228
What is the range of capacity that a high pressure boiler operator can be the chief engineer and work as a shift engineer based on the 12:90 boiler, pressure vessel and refrigeration rules?
Can act as chief engineer and stand watch of a plant with a minimum capacity of 100 HP and up to 500 HP
229
According to the regulation, a licensed operator on watch shall give constant attention and remain within sight and natural sound in both LP and HP boilers?
False - High Pressure Only
230
Air receivers must conform to what ASME Code?
Section VIII
