Boiler Flashcards
(153 cards)
1
Q
Where is caustic embrittlement most likely to occur?
A
on a riveted joint below the water line
2
Q
The maintenance of automatic direct fired boilers is covered under what document?
A
ASME CSD-1
3
Q
What would be the over-speed trip setting on a turbine with a normal operating speed of 1770 rpm?
A
1947 rpm
4
Q
How are the tube sheets supported in a fire-tube boiler?
A
by the shell, stays, and tubes
5
Q
When making adjustments to the firing rate of a power boiler, why should the air be increased to the burner before the fuel?
A
to prevent incomplete combustion
6
Q
On a steam boiler in order to prevent the generation of steam greater than the maximum working pressure requires activation of what device?
A
The high steam pressure limit control
7
Q
Is it necessary to provide a disconnect switch at an accessible location at the boiler?
A
An electrical disconnect switch shall be installed at the boiler at an accessible location with a cover plate that can be locked out in the open position
8
Q
One mechanical horsepower is equal to:
A
33,000 ft-lb/min
9
Q
A boiler with a steaming capacity of 27,117 lbs/hr would be rated at how many boiler horsepower?
A
786
10
Q
Who is responsible for obtaining pertinent operating, testing, servicing, and cleaning instructions for the controls and safety devices?
A
It is the responsibility of the installing contractor to deliver all the instructions to the equipment owner/user
11
Q
How much heat is required to change 2,500 lb of water to steam at 212 degrees?
A
2,425,750 Btu
12
Q
What would occur if there was a drop in the velocity of the liquid flowing through a heat exchanger?
A
the temperature of the liquid would increase
13
Q
What chemical should be added to boiler feedwater to prevent oxidation of the boiler drum and tubes?
A
sodium sulfite
14
Q
What ASME code symbol is used to denote a high pressure power boiler?
A
S
15
Q
The purpose of backseating a manual valve in an operating system is to…
A
isolate system pressure from the packing stuffing box to minimize packing leakage.
16
Q
Which of the following stack gas readings would indicate fair to good combustion taking place?
A
low oxygen and carbon monoxide, high carbon dioxide
17
Q
What is the horsepower rating of a 10,000 kW steam turbine?
A
13,400 hp
18
Q
The Mechanical Inspection Bureau incorporates by reference various codes, standards and practices. Once specific safety practice incorporated by reference for licensed operators specifies and identifies one called a qualified individual. How is the qualified individual identified in this reference?
A
A boiler service technician who is engaged in and responsible for the installation, replacement, repair or service of the boiler, fuel burning controls, and safety devices and is experienced in such work. In some states this individual must also hold an appropriate boiler operator’s license.
19
Q
If your boiler needs welded repairs, you must get approval for such repairs from the:
A
authorized inspection agency
20
Q
What would one standard atmosphere at 14.7 psi be equivalent to in feet of water?
A
34 feet
21
Q
What must take place in order for combustion air to flow open automatically during equipment operation?
A
There must be an adequate opening for the flow of fuel gas into the confines of the boiler room to ensure proper combustion
22
Q
What is the total horsepower of a plant that has three 350 hp boilers and one 500 kW steam turbine?
A
1,720 hp
23
Q
What water treatment chemical is used to control alkalinity in boiler feedwater?
A
caustic soda
24
Q
When a low-water fuel cutoff (LWFCO) has activated on a hot water heating boiler what shall happen?
A
Operation of the LWFCO shall cause a safety shutdown and lockout, requiring a physical manual reset
25
In accordance with ASME CSD-1, where is the installation of a manually operated remote shutdown switch or circuit breaker to be located?
Just outside the boiler room door, unless the door is on the building exterior and it must be marked for easy identification and installed on every exit door of the boiler room.
26
By N.J.A.C. 12:90 rules, what is the minimum thickness allowed for atmospheric type blowdown tank?
5/16 inch
27
When comparing a globe valve and a gate valve in the same application, the gate valve has a __________pressure drop when fully opened and is the _________choice for throttling.
lower: poorer
28
If a boiler has an operating pressure of 345 psi and a 2 1/2-inch diameter safety valve, what is the total force acting on the safety valve?
1,693.5 lbs
29
Which formula would you use to calculate the Btu/lb heat content of fuel oil?
17,687 + 57.7 x API @ 60 degrees F
30
What is the heating surface of water-tube, with a diameter of 3 1/2 inches and a length of 20 feet?
18.32 sq. ft
31
In boiler operation what is necessary for complete combustion?
atomization, time, mixture, and temperature
32
If a power boiler has a burner input of 6,900,000 Btu/hr, what would be its HP rating?
200 HP
33
Pursuant to N.J.A.C. 12:90, what is the temperature and pressure that defines a high-temperature hot water heating boiler?
250 degrees F at 160 psi
34
After an adjustment of the packing gland on a valve that had a minor packing leak, the operator attempts to operate the valve but finds it stuck. What is the most probable cause?
The operator overtightened the packing, causing the stem to bind.
35
Which of the following is a generally accepted method for locally verifying that a manual valve is fully closed in a depressurized static piping system?
Attempt to turn the valve hand wheel in the fully closed direction and verify no movement.
36
The heat that is added to convert a liquid to a vapor at a constant temperature is called.
latent heat of evaporation
37
Which one of the following statements is the generally accepted method to verify at the local level that a manual valve is fully closed on a static piping system that is in the depressurized condition?
As an operator you would attempt to turn the handwheel in the closed direction and verify no movement.
38
What is the purpose of a siphon on a steam pressure gauge?
to protect the gauge from high steam pressure
39
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
40
You are installing a boiler according to the boiler rules and regulations. Where must the filter and strainers for oil fired boilers be installed?
Upstream from the safety shut off valve
41
When a discharge valve is opened to the atmosphere, the pressure on the upstream side of the valve will...
decrease, and the pressure on the downstream side will remain the same.
42
In a cooling water system when comparing a 3-inch gate valve to a 3-inch globe valve used for the same application in the process, which statement below is correct if both valves were fully open?
The globe valve produces the larger head loss and the smaller flow rate.
43
When making adjustments to the firing rate of a power boiler, why should the air be increased to the burner before the fuel?
to prevent incomplete combustion
44
Furnace explosions can best be avoided by:
purging the furnace after any flame interruption
45
What must take place in order for combustion air to flow open automatically during equipment operation?
There must be an adequate opening for the flow of fuel gas into the confines of the boiler room to ensure proper combustion
46
The term viscosity can best be defined as:
the point at which oil starts to flow
47
In the ignition system on an oil burner, what causes the spark to jump the gap and ignite the fuel?
a high voltage spark of 10,000 VDC produced from the transformer, jumps the gap between the electrode tips.
48
A gradual increase in the stack temperature could indicate what condition in a boiler?
Select one:
heating surface fouling
49
What are the three types of draft used in power plants?
natural, forced, and induced
50
What is the Btu content of natural gas?
100,000 Btu/therm
51
When the gas limit switch comes into operation, what device does it activate?
fuel line solenoid valve
52
You are installing a boiler according to the boiler rules and regulations. Where must the filter and strainers for oil fired boilers be installed?
Upstream from the safety shut off valve
53
Which of the following best defines the term "balanced draft"?
the forced draft and induced draft fans are regulated to keep the furnace below atmospheric pressure
54
What type of draft system is used to overcome resistance on power boilers equipped with an economizer?
an induced draft system
55
What are the two element s in fuel oil that produce most of its heat?
carbon and hydrogen
56
Which of the following stack gas readings would indicate fair to good combustion taking place?
low oxygen and carbon monoxide, high carbon dioxide
57
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
58
The ignition system on a burner must be able to generate enough volts so that it lights the fuel in the burner. What is the line voltage being used?
the line voltage could vary but is typically 120 V AC.
59
To eliminate the danger of a furnace explosion during start-up, the firing sequence must first allow for:
a pre-purge period
60
Which formula would you use to calculate the Btu/lb heat content of fuel oil?
17,687 + 57.7 x API @ 60 degrees F
61
On a rotary cup type burner, the low gas pressure limit switch should be electronically interlocked to the:
the fuel solenoid valve
62
In boiler operation what is necessary for complete combustion?
atomization, time, mixture, and temperature
63
What condition would cause a feedwater pump to become vapor bound?
the feedwater temperature is too hot
64
In a cooling water system when comparing a 3-inch gate valve to a 3-inch globe valve used for the same application in the process, which statement below is correct if both valves were fully open?
The globe valve produces the larger head loss and the smaller flow rate.
65
Which of the following is the proper method for testing a low-water cut-off device on a steam boiler?
lower the water level in the boiler until the burner shuts down
66
By N.J.A.C. 12:90 rules, what is the minimum thickness allowed for atmospheric type blowdown tank?
5/16 inch
67
Steam at 100 psi and 400 degrees F would be considered:
superheated steam
68
The purpose of backseating a manual valve in an operating system is to...
isolate system pressure from the packing stuffing box to minimize packing leakage.
69
When a discharge valve is opened to the atmosphere, the pressure on the upstream side of the valve will...
decrease, and the pressure on the downstream side will remain the same.
70
Which of the following types of similarly sized valves in an operating water system produces the least frictional head loss when fully open?
Ball valve
71
Which of the following is not a function of a non-return valve?
opens automatically if the boiler operating pressure drops below the header pressure
72
What would one standard atmosphere at 14.7 psi be equivalent to in feet of water?
34 feet
73
If steam were reduced by a PRV from 500 psi to 125 psi, the steam at 125 psi would have:
the same heat as at 500 psi
74
While making a round of your boiler room, the boiler feedwater pump is making a strange noise. The pump casing and the temperature of the water has risen above normal. What would most likely cause this problem?
pump cavitation issue
75
Before a hydrostatic test is performed on a boiler, each safety valve should be:
held to its seat by means of a testing clamp
76
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
77
Where is caustic embrittlement most likely to occur?
on a riveted joint below the water line
78
What chemical should be added to boiler feedwater to prevent oxidation of the boiler drum and tubes?
sodium sulfite
79
When comparing the application of a globe and gate valve for the same process, which of the following statements is true?
The gate valve has a lower pressure drop when fully open and is the poorer choice for throttling operation.
80
If a boiler has an operating pressure of 345 psi and a 2 1/2-inch diameter safety valve, what is the total force acting on the safety valve?
1,693.5 lbs
81
In the State of New Jersey, when is it permissible to have only one bottom blow off valve on a boiler?
when the MAWP does not exceed 100 psi
82
On a steam boiler in order to prevent the generation of steam greater than the maximum working pressure requires activation of what device?
The high steam pressure limit control
83
The ASME Code states that before bringing a high-pressure boiler online, it must be warmed-up. Assuming all conditions are normal, what is common practice regarding closing of the vent valve?
close the vent when the pressure gauge reads 25 psi
84
What water treatment chemical is used to control alkalinity in boiler feedwater?
caustic soda
85
By ASME code, the size of the water column connections to a boiler must be a minimum of:
1 inch
86
Which one of the following statements is the generally accepted method to verify at the local level that a manual valve is fully closed on a static piping system that is in the depressurized condition?
As an operator you would attempt to turn the handwheel in the closed direction and verify no movement.
87
When a low-water fuel cutoff (LWFCO) has activated on a hot water heating boiler what shall happen?
Operation of the LWFCO shall cause a safety shutdown and lockout, requiring a physical manual reset
88
What is the purpose of a siphon on a steam pressure gauge?
to protect the gauge from high steam pressure
89
Which of the following types of similarly sized valves requires the most manual valve stem rotation to move the valve from fully open to fully closed? (Assume that each valve has a non-rising stem.)
Gate valve
90
When comparing a globe valve and a gate valve in the same application, the gate valve has a __________pressure drop when fully opened and is the _________choice for throttling.
lower: poorer
91
Which of the following is a generally accepted method for locally verifying that a manual valve is fully closed in a depressurized static piping system?
Attempt to turn the valve hand wheel in the fully closed direction and verify no movement.
92
Which of the following best defines saturated steam?
steam at a temperature corresponding with its pressure
93
The steam pressure on a safety valve acts upon upperside of the valve disc, which is held down upon the seat by a spring that pushes down.
False
94
A "water hammer" condition in a steam plant is dangerous because it can:
The correct answer is: lead to steam pipe failure
95
What would be the over-speed trip setting on a turbine with a normal operating speed of 1770 rpm?
1947 rpm
96
After an adjustment of the packing gland on a valve that had a minor packing leak, the operator attempts to operate the valve but finds it stuck. What is the most probable cause?
The operator overtightened the packing, causing the stem to bind.
97
Pursuant to N.J.A.C. 12:90, what is the temperature and pressure that defines a high-temperature hot water heating boiler?
Select one:
exceeds 250 degrees F at 160 psi
98
A boiler with a steaming capacity of 27,117 lbs/hr would be rated at how many boiler horsepower?
786
99
What is the total horsepower of a plant that has three 350 hp boilers and one 500 kW steam turbine?
1,720 hp
100
In a fire-tube boiler, how are the tubes usually attached to the tube sheet?
by rolling the tubes and beading the ends
101
How are the tube sheets supported in a fire-tube boiler?
by the shell, stays, and tubes
102
Air receivers must conform to what ASME Code?
Section VIII
103
Is it necessary to provide a disconnect switch at an accessible location at the boiler?
An electrical disconnect switch shall be installed at the boiler at an accessible location with a cover plate that can be locked out in the open position
104
How much heat is required to change 2,500 lb of water to steam at 212 degrees?
2,425,750 Btu
105
What would occur if there was a drop in the velocity of the liquid flowing through a heat exchanger?
Select one:
the temperature of the liquid would increase
106
In accordance with ASME CSD-1, where is the installation of a manually operated remote shutdown switch or circuit breaker to be located?
Just outside the boiler room door, unless the door is on the building exterior and it must be marked for easy identification and installed on every exit door of the boiler room.
107
A thermal expansion feedwater regulator operates by:
the expansion and contraction of a thermostatic element
108
If your boiler needs welded repairs, you must get approval for such repairs from the:
authorized inspection agency
109
If a power boiler has a burner input of 6,900,000 Btu/hr, what would be its HP rating?
200 HP
110
What ASME code symbol is used to denote a high pressure power boiler?
S
111
What is the heating surface of water-tube, with a diameter of 3 1/2 inches and a length of 20 feet?
18.32 sq. ft
112
Who is responsible for obtaining pertinent operating, testing, servicing, and cleaning instructions for the controls and safety devices?
Select one:
It is the responsibility of the installing contractor to deliver all the instructions to the equipment owner/user
113
One mechanical horsepower is equal to:
33,000 ft-lb/min
114
Where would you find downcomer tubes?
in water-tube boilers
115
Boiler manways and handholes are oval for what reason?
for removal from the pressure vessel
116
The maintenance of automatic direct fired boilers is covered under what document?
ASME CSD-1
117
A three-element feedwater regulator is controlled by what means?
steam flow, feedwater flow, and drum level
118
The heat that is added to convert a liquid to a vapor at a constant temperature is called.
latent heat of evaporation
119
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
120
A draft system that maintains a constant pressure on a boiler is called a/an:
balanced draft system
121
Which of the following could be used to control a fan's output?
djusting the pitch of the fan blades
b. adjusting the inlet dampers
c. increasing or decreasing the fan speed
d. all of the above
122
Which of the following best defines the term "balanced draft"?
the forced draft and induced draft fans are regulated to keep the furnace below atmospheric pressure
123
What type of draft system is used to overcome resistance on power boilers equipped with an economizer?
Select one:
an induced draft system
124
What are the three types of draft used in power plants?
natural, forced, and induced
125
A manometer is calibrated in what units of measurement?
inches of water
126
What are the two element s in fuel oil that produce most of its heat?
carbon and hydrogen
127
Which of the following stack gas readings would indicate fair to good combustion taking place?
low oxygen and carbon monoxide, high carbon dioxide
128
What type of oil burner provides atomization without the use of steam or air?
the pressure-type burner
129
A gradual increase in the stack temperature could indicate what condition in a boiler?
heating surface fouling
130
In modern stationary engineering, a flue gas analysis is done to:
determine combustion efficiency
131
In boiler operation what is necessary for complete combustion?
atomization, time, mixture, and temperature
132
On boilers equipped with an air preheater, what is the purpose of the by-pass damper?
to control the temperature of the combustion air
133
When making adjustments to the firing rate of a power boiler, why should the air be increased to the burner before the fuel?
to prevent incomplete combustion
134
In a steam generating plant, what purpose does the economizer serve?
to heat the feedwater using stack gases
135
The term viscosity can best be defined as:
the point at which oil starts to flow
136
Which formula would you use to calculate the Btu/lb heat content of fuel oil?
17,687 + 57.7 x API @ 60 degrees F
137
What would a high pressure differential across a fuel oil strainer set indicate?
a dirty fuel oil strainer
138
Before burner ignition, what is the minimum number of furnace volume air changes that should be provided by the purge cycle?
four
139
What is the Btu content of natural gas?
100,000 Btu/therm
140
Which of the following auxiliaries would most improve boiler efficiency?
an economizer
141
When a discharge valve is opened to the atmosphere, the pressure on the upstream side of the valve will...
decrease, and the pressure on the downstream side will remain the same.
142
When comparing a globe valve and a gate valve in the same application, the gate valve has a __________pressure drop when fully opened and is the _________choice for throttling.
lower: poorer
143
Which of the following types of similarly sized valves in an operating water system produces the least frictional head loss when fully open?
Ball valve
144
Which one of the following statements is the generally accepted method to verify at the local level that a manual valve is fully closed on a static piping system that is in the depressurized condition?
As an operator you would attempt to turn the handwheel in the closed direction and verify no movement.
145
Which of the following is a generally accepted method for locally verifying that a manual valve is fully closed in a depressurized static piping system?
Attempt to turn the valve hand wheel in the fully closed direction and verify no movement.
146
After an adjustment of the packing gland on a valve that had a minor packing leak, the operator attempts to operate the valve but finds it stuck. What is the most probable cause?
The operator overtightened the packing, causing the stem to bind.
147
In a cooling water system when comparing a 3-inch gate valve to a 3-inch globe valve used for the same application in the process, which statement below is correct if both valves were fully open?
The globe valve produces the larger head loss and the smaller flow rate.
148
The purpose of backseating a manual valve in an operating system is to...
isolate system pressure from the packing stuffing box to minimize packing leakage.
149
Which of the following types of similarly sized valves requires the most manual valve stem rotation to move the valve from fully open to fully closed? (Assume that each valve has a non-rising stem.)
Gate valve
150
What is the total horsepower of a plant that has three 350 hp boilers and one 500 kW steam turbine?
1,720 hp
151
What is the horsepower rating of a 10,000 kW steam turbine?
13,400 hp
152
A boiler with a steaming capacity of 27,117 lbs/hr would be rated at how many boiler horsepower?
786
153
86,250 pounds of steam per hour equal how many boiler horsepower?
2,500
