Boiler Flashcards
(237 cards)
1
Q
At 0 pasig, How many BTUs are necessary to change 1 pound of water at 212° in the 1 pound of steam
A
970
2
Q
Radiation is a form of heat transferred by
A
Waves
3
Q
Steam at 100 psi and 400°F is
A
Super heated
4
Q
Which of the following most closely define sensible heat
A
Heat quantity above the point of saturation
5
Q
What is required to raise the temperature of 1 pound of water at 32° to 212°F
A
180 btu. 212-32=180
6
Q
Increasing the pressure has what effect on the boiling point of water
A
Temperature will rise
7
Q
Heat absorbed by water when it changes from a liquid to steam at the boiling point is called
A
Latent heat
8
Q
Heat may be transferred in how many ways
A
3
9
Q
A boiler horsepower is defined as
A
Evaporation of 34.5 pound of water from And at 2 12°F per hour
10
Q
A boiler steam pressure gauge reads 150 what is the absolute pressure
A
Absolute pressure is 164.7. 150 PSIG +14.7 atmospheric pressure
11
Q
What does 212°F equal on the Celsius scale
A
100
12
Q
One boiler horsepower is equal to how many BTUs
A
33,472
13
Q
A British thermal unit is
A
The amount of heat needed to raise 1 pound of water 1°F
14
Q
Hydronic heat is
A
Hot water heat
15
Q
Superheated steam is
A
Reheated steam
16
Q
2545 BTUH represents
A
One horse power hour
17
Q
A throttling calorimeter is used to measure the quality of
A
Saturated steam
18
Q
The amount of heat and 1 pound of saturated steam is approximately equal to
A
1150 BTU
19
Q
A boiler operating 100 psi as a saturated steam temperature 338°F what is the boilers water
A
338Degrees Fahrenheit
20
Q
Heat dry pipe is used to
A
Separate moisture from steam as it leaves the drum
21
Q
The purpose of a staybolt is to
A
Strengthen and support flat plates on the fire tube boiler
22
Q
The boiler vent valve is located on
A
The top of the steam drum
23
Q
The purpose of the hole in the end of the stay bolt is to
A
Indicate that the stay bolt is cracked or broken
24
Q
A fusible plug melts
A
450°F
25
As the fire rating increases in a boiler equipped with a convection superheater The steam temperature
Increases
26
When boilers are connected to a common header it it required than ample free Blowing drain be provided between the stop Valves if either or both boilers have
Manholes
27
It is permissible to have only one bottom blowdown valve on the boiler When
When the mawp Does not exceed 100 psi
28
When the boiler pressure exceeds 125 psi is required
Extra heavy duty pipe be used on the blowoff system
29
Baffles our place between the tubes of a Boiler for the purpose of
Directing the travel of fluegases
30
A boiler has a steaming capacity of 35,500 pounds of steam for our the evaporation rate is 10 pounds per foot squared of heating service per hour what is the horsepower rating at the border
1000
31
Boiler tube sizes are specified by
Outside diameter
32
The maximum size of boiler blowdown lines valves and fittings you’re not exceed
2 1/2 inches
33
The purpose of an expansion tank in hot water heating system is to provide for the
Expansion of Water
34
Heavy accumulation of soot in a boiler will result in
Loss of boiler efficiency
35
How are the tube secured in a fire tube boiler
Rolled and beaded over
36
A tube in a fire tube boiler is surrounded
Water
37
Atmospheric pressure is considered to be at
14.7 PSIA
38
In a water tube boiler flue What surrounds the tubes
Fluegases
39
Diagonal stays are found in
Firetube boilers
40
Hand holes in manholes are oval
For the removal from the pressure vessel
41
Check the water level level in the gauge glass of steam boiler use the
Trycocks
42
The vent valve does what
Removed air during warm up and prevents a vacuum from Forming during cool down
43
A high-pressure boiler has it safety valve set at
Above 15 psi
44
What is it an advantage of a fire boiler over of a water tube boiler
Lower initial cost
45
Water walls are found
In a water tube boiler furnace
46
The best time to bottom blow down the boiler is
Low load under full pressure
47
A telltale Hole is found in a
Staybolt
48
A 2 inch boiler tube has a wall thickness of 3/16 of an inch what is the inside diameter
One and five eights inches
49
At what temperature does steel start rapidly lose its strength
700°F
50
A hot water heating system is about to be started how full of water should expansion tank gauge class
1/3
51
What is the relationship between longitudinal stress and circumferential stress
Longitudinal stress is twice the circumferential stress
52
A therm is equal to how many BTU
100,000
53
The factor of evaporation is
Heat added the boiler divided by 970.3
54
The purpose of a bottom blow down is
Remove sledge and sediment
55
Superheaters raise the temperature of
Steam
56
The heating surface of a boiler is the
Exposed to the flame and fluegases
57
The purpose of a super heater is
To heat steam above its
saturation temperature
58
What is the formula for the factor of evaporation
H-b/970.3 btu
59
What can cause a super heater to overheat
Dirty tubes
60
A boiler has a steam in capacity of 34,500 pounds of steam per hour. The evaporation rate is 10 pounds per foot squared of heating service per hour. What is a boiler heating surface
3450
61
How many square feet of heating surfaced as a 3 inch fire tube 20 foot long with 3/16 inch inch wall have
13.7
62
In a high temp hot water boiler what causes a tube to overheat
Poor circulation or plugged tube
63
Where is a downcomer found
A water tube boiler
64
Extreme fire box temperature changes causes
Spalling
65
The low water cut off does what
Shut off the burner when the boiler is low on water
66
Steam coming from the bottom try cock would indicate what
Low water level
67
Which type of valve has the most resistance to flow
Globe
68
When checking the water level of the boiler do what
Blow down the gauge glass and water column
69
A siphon or pigtail is used to protect a steam pressure gauge from
Steam Temperature
70
The feed water water regulator is located
At the normal operating water level
71
And automated feed water regulator does
Insurers the proper water level in the boiler
72
To test the low-water cut off
The burner must be fired
73
The purpose of testing a safety valve by hand is to
Make sure the valve can lift
74
The automatic control that protect the boiler from being dry fired is
Low water cut off
75
On a steam boiler testing the operation of the safety valve by hand with the boiler under pressure should be done how often
Monthly
76
What type of valve has the least resistance to flow
Gate
77
The gauge glass shows full while the middle try cock shows steam. When blow down the gauge glass refills. What is the probable cause
The top gauge glass connection is blocked
78
The purpose of a bowl at the bottom of the water column is to
Serve as a sediment chamber
79
When checking a safety valve with a hand lifting gear the pressure should be no lower than
75% of the safety valve set pressure
80
If valves are located between the boiler and water column they must be what
Locked or sealed open
81
When A hydrostatic test is put on a boiler each safety valve should be
Held to its seat by the means of a testing clamp
82
After installing a new gauge glass the proper procedure for returning the glass to service is to
Open the drain and crack the top valve open
83
The steam pressure gauge is graduated in
Pounds per square inch
84
One of the purposes of the water column is to
Dampen the oscillation of the water in the gauge glass
85
The gauge glass should be blown down
Daily
86
The flame failure control is tested by
Securing
| the fuel supply to the burner
87
An aquastat
Controls operation to the changes in temperature
88
The pressure sensitive device attached to the van housing have a fully automatic burner starts operating when there is a
Fan failure
89
If the pressuretrol starts the burner and ignition fails to take place the controller that protects the
Flame failure cut off
90
The pressure sensitive eyes is sometimes called a what
Vaporstat
91
Draft is measured
Inches of water
92
Which of the following is used to measure temperature
Pyrometer
93
The main stop valve is located on the
Steamline
94
OS&Y stands for
Outside screw and yolk
95
An interlock control
Is a device that prevents attempt to fire unless safe
96
Proper ignition referred
Flame Scanner detecting the pilot flame
97
More than one safety valve is required on boilers that have over
500 ft.² of heating surfaces
98
Two or more boilers are equipped with the manholes are connected to common header must have
2 stop valves with the drain coming Off between them
99
Before the gas pilot ignites
Furnace must be purged
100
If the main gas valve is closed on the burner is on
The flame detector will not activate
101
Safety valves on superheaters are
Lower than a drum safety valve
102
Convert 160 PSI the absolute pressure
160+14.7 = 174.7 PSIA
103
What is the main pipe size of the gauge glass blow down line
Three eights inch
104
Only one bottom blowdown valve and required for Boilers under
100psi. Mawp
105
The type of safety valve allowed on the boilers are
Spring loaded pop
106
Who is authorized to repair and adjust safety valves
Manufactures representative
107
Which valve allows fluid to flow in one direction only
Check valve
108
To Stop by safety valve from chattering
Raise the blow down ring
109
Minimum permitted size of the water column pipe connection
1 inch
110
Number of complete turns required between open and close on a slow opening valve
5
111
What is the principle of the bourdon tube
Pressure straightens out tube
112
Valve must be installed in the feed water line where
Between the check valve and feed water water pump
113
A continuous blow down is used to
Remove accumulated solids
114
What should come out with the bottom try Cock when open
Water
115
What is the minimum diameter for the water column blow down line
Three quarter-inch
116
What is a minimum size piping for the bottom blowdown lines
1 inch
117
How often should safety valves be tested
Monthly
118
A 2 element feed water regulator is controlled by
Water level in steam flow rate
119
Which of the following is not performed by non-return valve
Open automatically if the boiler pressure exceeds the header pressure
120
You should not run accumulation test on a boiler equipped with a
Superheaters
121
The minimum setting on the blow back of a safety valve is
2 pounds
122
Good combustion result in
Low oxygen and carbon monoxide high carbon dioxide
123
Excess air for gas should not exceed
10%
124
Ringleman scale is associated with
Smoke Density
125
What do mechanical burner use for Atomization
High pressure fuel
126
A fire eye is used for what
Notify the programmer about the presence of a flame
127
Purge cycle does what
Removes unburned fuel
128
The flame detector is directed where
Into the furnace area
129
The programmer does what
Open the pilot valve open the main valve and receives the flame detector signal
130
Flue gas percentages does what from fuels to fuel
Stays constant
131
An orstat Measure What
O2 co co2
132
The flame failure control is tested by
Shutting off the fuel supply to the burner
133
What is the efficiency of a steam plant with the heat rate of 12,000 BTUs/kw
28.4
134
What type of you must be preheated to burn properly
Heavy oil
135
Number six fuel of a mechanical atomizer burners is usually heated to what Temperature
150°
136
Fuel suppliers specify a minimum flashpoint for their oil because
A low flashpoint oil is dangerous
137
How many cubic feet a furnace volume Is needed to burn one gallons of number six oil
10
138
As fuel oil is heated it’s viscosity
Decreases
139
Crabon monoxide in the flue gas is a sign of
Incomplete combustion
140
Flashpoint means
Ignition temp
141
Preheat the number six oil should be
120 to 190°
142
What is the proper or storage temperature for number six oil
20°F above pour point
143
Pour point is
The lowest temp at which a liquid flows
144
To prime a pump
Fill the casing with water
145
Balanced draft means
Almost atmospheric pressure in the wind box
146
A gallon of No. 6 oil contains how many BTUs
152,000
147
During the purge cycle what is the minimum amount of air volume changes required
4
148
The purge cycle time for gas compared to oil is
The same
149
High levels of carbon monoxide indicate
Combustion is not complete
150
The induced draft fan is located in
Breaching
151
A balanced draft boiler requires
Both forcedand induced draft
152
What percentage of CO2 would be expecting a well-maintained boiler burning number six
15%
153
Which of the following yields a high CO2 level
Proper air fuel mixture
154
Lo excess air causes
Smoke
155
The proximate analysis a coal determines
The percentage by weight of moisture content, volatile matter, fixed carbon, Ash and sometimes sulfur
156
The ultimate analysis of coal determines
The percentage by weight of various elements contained and Cole, which includes carbon, oxygen, nitrogen, hydrogen, sulfur, and ash
157
What does volatile mean
Flammable gas and coal that is the distilled off and burned about grates in suspension
158
Amount of excess air required for coal is
35%
159
Which of the formula approximates the heat content in BTU per pound of fuel oil
17,687 x 57.7 plus API gravity at 60°F
160
Two elements of fuel oil the produce is most of its heat are
Carbon and hydrogen
161
What fan supply the boiler with the positive pressure
Forced draft
162
Doubling plate is placed where
Under the gauge well
163
The induced draft fan is located between
Boiler and the stack
164
A fans output can be controlled by
Change in speed, changing blade pitch, inlet dampers
165
Economizers preheat
Feed water
166
When would the overspeed bike trip on a turbine operating at 7000
7700 RPM
167
In a firetube boiler Soots forms on the
Inside tube surface
168
Sudden increase in stack temperature indicates
Broken baffle
169
A gradual increase in stack temp indicates
Heating surface fouling
170
To ensure a good heat transfer in water to boilers the outside of the tubes are kept clean by
Soot blowing
171
A cause of high stack temperature is
Dirty boiler tubes and broken baffles
172
Which type of boiler is most likely to use a soot blower
Water tube boiler
173
What is an economizer are used for
Increase boiler efficiency by heating feed water from Stack gas
174
Dewpoint is a serious concern in a plant with
Tubular air heaters
175
And economizer is located where
In the stack
176
If a soot blower were to operate Improperly for a long period of time what would most likely result
Damaged boiler tubes
177
What would most likely improve and boiler efficiency
Economizer
178
What is the purpose of a steam trap
Drain condensation and air
179
On an inverted bucket trap, what happens to the bucket as a trap fills of water
It sinks
180
What steam trap has no moving parts
Continuous flow
181
What results when steam blows through a trap
Low plan efficiency noise and lost the steam
182
What happens when the float in a float and thermostatic developed a leak
Fails to open
183
The chemical used to have an oxidation is
Sodium sulfite
184
Feed water is treated to prevent
Scale
185
Dearating is
Removing noncondensible gases from the feed water
186
Priming means
Water leaving The boiler through the Steamline and/or filling the pump with fluid top establish suction
187
What chemical is fed to the deaerator
Sodium sulfite
188
What chemical is used to control scale
Phosphate
189
What chemical is used to control alkalinity
Caustic soda
190
Corrosion in the boiler is caused by
Low alkalinity (ph)and free oxygen
191
Scale in a boiler is caused by
Calcium and magnesium
192
Cuprous chloride is found in a
Flue gas analyzer
193
Zeolite is found in a
Softener
194
The device on at the deaerator that keeps the water from backing up into the Steamline is
Overflow device
195
Which pH value indicated a solution is neither acid or alkaline
7
196
Hardness of water is expressed in
Grains or parts per million
197
Where is caustic embrittlement most likely to be found
Riveted joints below the waterline
198
A closed feed water water heater is located
Between the feedwater pump in the boiler
199
Where would scale most likely occur
Below the waterline
200
Zeolight is a
Ion exchange resin
201
On the pH scale 8 is
Alkaline
202
Which of the following is likely be using the feed water treatment
Sodium sulfate
203
The result of High dissolved oxygen is
Corrosion
204
What percentage of heat supply to the turbine is lost in the condenser cooling tower
70%
205
And atmospheric relief valve is used on a
Turbine condenser
206
Which of the following is located on the inlet line of a turbine condenser
An Atmospheric relief valve
207
What does an atmospheric relief valve do
Protects the condenser and low pressure turban casing from overpressure
208
Critical speed refer to
Speed at which the most vibration occurs
209
1KW equals how many horsepower
1.34 hp
210
What is the formula that can be used figure out how many poles are on a three phase 60 Hz 3600 RPM generator
120 times hertz divided by the RPM
211
One mechanic horsepower is equivalent to
.746 kW, 746 Watts , 2545 btu
212
How are large utility generators cool
H2
213
845 hp motor runs at 74% efficiency what is wAtts per hour rate
1008.10
214
What is a sentinel valve
Device to warn of overpressure in a turbine condenser
215
A synchroscope is associated with
Synchronous generators
216
How often is a turbine over speed test it
Every time Its put online
217
Oil contaminated condensate return is one of the serious concerns in the
Closed feed water heater
218
An intercooler is used on
A two-stage air compressor
219
On a surface condenser what flows through the tubes and one of the tubes around it by
Cooling water flows through a tube surrounded by exhaust steam
220
1 hp is electrical equivalent to how many watts
746
221
A receiver in a compressor air system does what
Stores compressed air
222
A synchrocope does what
Matches generator the system phasing
223
A roll of impulse blades has what effect on rotating blades
None
224
If two similar centrifugal pumps are connected in a series resulting output is
Constance flow pressure decrease
225
In the field of a synchronized electric motor is overexcited the result is
Leading power factor
226
How much torque is a 3600 RPM 200 hp electric motor develop
292
227
What is most likely causing to feed water become pump becomes vapor bound
Water too hot
228
How is a rotation reversed on a three phase motor
Reverse any 2 power leads
229
How many Watts does a 45 horse motor consumer operating at 75% efficiency
44,800
230
Circuit breaker shows the same function as a
Fuse
231
Electric current is measured in
Amps
232
What is the formula for finding the frequency of an alternator
P x rpm/ 120
233
What is a formula for calculating speed of a synchronous motor
(120 x f)/p
234
Which feed water system is Least efficient
Injector
235
If two similar centrifugal pumps are we connected in parallel they would be
Flow increased. constant pressure
236
When starting, the correct way to put the least amount of strain on a pump and a minimum load electrical motor is to
Have the suction valve open in the discharge valve closed
237
On a stream driven boiler feed pump, which pipe is larger
Turbine steam exhaust and pump suction
