Download MN Boiler License Questions and Correct Answers| Latest Update and more Exams Mechanical Engineering in PDF only on Docsity!
MN Boiler License Questions and Correct
Answers| Latest Update
what are the conditions necessary for good combustion? a) low sulfur content b) Thermal, thermocouple, tubular c) turbulence, temperature, time 3T's c) turbulence, temperature, time 3T's why is secondary air necessary in hand fired boilers? a) Necessary to burn the combustible gases b) if primary air should fail c) used only if sulfur content is high a) Necessary to burn the combustible gases when pressure increases on steam from a given amount of water what happens to its volume and latent heat? a) increases b) decreases
c) remains the same b) decreases when pressure increases on steam from a given amount of water what happens to its temperature? a) increases b) decreases c) remains the same a) increases when carbon monoxide (co) is formed and carbon dioxide (co2) is very high what does it generally signify? a) More "under the fire air" is needed b) less "under the fire air" is required c) more "over the fire" air is needed d) less "over the fire" is needed less c) more "over the fire" air is needed excess air is an expression that refers to: a) overabundance of air b) theoretical amount of air
heavy oil must be heated before entering the burner to: a) increase carbon content b) decreased sulfur content c) get proper atomization c) get proper atomization why should a daily log be kept of flue gas temperature? a) Valuable information in case of explosion b) superintendent files them c) change an operation, causing heat loss, can be detected c) change an operation, causing heat loss, can be detected find SWP of a boiler 72 inches in diameter, thickness of one-half inch, tensile strength of 55,000 pounds, quadruple riveted butt and strap joint (.94) factor of safety 5: a) 14. b) 143. c) 1436 b) 143.
the total heat of steam is 1,188 BTUs, and feed water temperature is 182 degrees Fahrenheit. What is the factor of evaporation? a) 107 b) 10. c) 1. c) 1. why would viscosity be important in fuel oil? a) more heat is recovered in water b) has more volatile hydrocarbons c) affects ease with which it can be handled c) effects ease with which it can be handled why is too much air objectionable? a) Cost too high b) loss of efficiency c) corrosive effect b) loss of efficiency
B) 251.32'sq C) 2513'sq D) 20.93'sq D) 20.93'sq What Is The Minimum Size Of The Pipes Connecting The Boiler To The Water Column? A) 3/4 Inch B) 1 Inch C) 1/2 Inch A) 3/4 Inch Why Are Crosses Used Instead Of Ells On Water Column Connections? A) Cost Less B) Has More Strength C) Line May Be Easily Cleaned C) Line May Be Easily Cleaned Can You Have Valves Between Boiler And Water Column? A) Yes, If They Are Locked Or Sealed Open
B) No, They Might Be Closed Accidentally C) Only If The Boiler Is Under 100 Horsepower A) Yes, If They Are Locked Or Sealed Open Can You Have Valves Between Boiler And Water Column? A) Yes, If They Are Locked Or Sealed Open B) No, They Might Be Closed Accidentally C) Only If The Boiler Is Under 100 Horsepower A) Yes, If They Are Locked Or Sealed Open In The HRT Boiler, The Fuse Plug Is Located In The Rear Head, _____ Inches Above The Top Row Of Tubes. A) 2" B) 1/2" C) 1" A) 2" A Siphon Coil (Pigtail) Is Employed In Steam Gauge Line Protects The : A) Bourdon Tube B) Piping
C) Control Water Level In A Boiler When Two Stop Valves Are Used On A Steam Outlet Line, It Is Good Practice To Have One Valve : A) Slow Opening B) Automatic Non-Return C) Quick Opening B) Automatic Non-Return Is The Valve Stem Connected To The Disc On An Automatic Non-Return Valve? A) No B) Yes C) Only When Open A) No What Must You Have Between Two Stop Valves On The Steam Outlet And Between The Header Line? A) Thermocoupler B) Dial Actuated Thermostat C) Drain C) Drain
On A Globe Valve Used On Feed Piping, The Inlet Shall Be: A) Immaterial B) Above The Valve Disc C) Under The Valve Disc C) Under The Valve Disc Which Valve Offers Very Little Resistance To A Flow? A) Gate B) Globe C) Check A) Gate Which Valve Is Used Where A Flow In One Direction Only Is Desired? A) Gate B) Globe C) Check C) Check
The Maximum Steaming Capacity Of A Boiler Shall Be Based On The: A) Capacity Of The Fuel Burning Equipment, Air Supply, Draft, Etc. B) Ability Of The Fireman C) Type Of Boiler Under Test D) Temperature Of Ht Boiler Feed Water A) Capacity Of The Fuel Burning Equipment, Air Supply, Draft, Etc. One Of Mare Safety Valves On The Boiler Proper Shall Be Set: A) At Or Below The Maximum Allowable Working Pressure B) Not More Than 6% Above The Maximum Allowable Working Pressure C) Not More Than 10% Above The Maximum Allowable Working Pressure D) Not More Than 15% Above The Maximum Allowable Working Pressure A) At Or Below The Maximum Allowable Working Pressure If Additional Valves Are Used, The Highest Pressure Setting Shall Not Exceed The M.A.W.P. By More Than: A) 3% B) 4% C) 5%
D) 6%
A) 3%
Safety Valves Shall Be: A) Positive Weight B) Direct Spring Loaded Type C) Combination Of Weight And Spring D) Doesn't Make Any Difference B) Direct Spring Loaded Type Dead-Weight Or Weighted-Lever Safety Valves May Be Used: A) When Pressure Is Less Than 100 Psi B) Never C) Only By Permission Of Boiler Inspector D) Under 15 Psi B) Never If It Is Desirable To Prove The Computations Of The Safety Valve Capacity It May Be Done In:
No Valve Of Any Description Shall Be Placed Between The Required Safety Valve Or Valves And The Boiler Nor On The Discharge Pipe Between The Safety Valve And The Atmosphere. A) If Over 15psi B) If Over 100psi C) Without Written Permission From State Boiler Inspector D) At Any Time D) At Any Time If A Discharge Pipe Is Used On The Safety Valve, The Cross Sectional Area Shall Be: A) Not Less Than The Full Area Of The Valve Outlet B) Two Times The Full Area Of The Valve Outlet C) Three Times The Full Area Of The Valve Outlet D) It Doesn't Make Any Difference A) Not Less Than The Full Area Of The Valve Outlet Safety Valves Shall Operate Without Chattering And Shall Be Adjusted To Close After Blowing Down Not More Than: A) 4% But Not Less Than 2 Lbs Psi B) 3% But Not Less Than 4 Lbs Psi
C) 6% But Not Less Than 4 Lbs Psi D) 10% But Not Less Than 2 Lbs Psi A) 4% But Not Less Than 2 Lbs Psi The Spring In A Safety Valve In Service For Pressure Up To 250lbs Psi Shall Not Be Used For Any Pressure More Than _______ Below That For Which It Is Designed. A) 2% Above Or 2% B) 6% Above Or 6% C) 10% Above Or 10% D) 12% Above Or 12% C) 10% Above Or 10% For Pressure Above 250lbs P.S.I. , The Safety Relief Shall Not Have A Pressure More Than ______ Below That That For Which It Is Designed. A) 2% Above Or 2% B) 5% Above Or 5% C) 6% Above Or 6% D) 10% Above Or 10% B) 5% Above Or 5% Every Attached Super-Heater Shall Have One Or More Safety Relief Valves:
When A Safety Valve Leaks At A Pressure Less Than That At Which It Is Set To Open: A) Tighten The Tension On The Spring Until It Stops B) Keep Opening And Closing By Lifting The Lever To See If It Is Seating C) Have Valve Repaired Or Replaced D) It Doesn't Matter If Safety Valve Leaks Some C) Have Valve Repaired Or Replaced The Only Time It Is Permissible To Set The Popping Point Of A Safety Valve Higher Than The S.W.P. Is When: A) The Boiler Is Under 5 Years Old B) Approved By The State Boiler Inspector C) There Is More Than One Valve, One May Be 3% Above S.W.P D) If There Is More Than One Valve, One May Be 6% Above S.W.P. C) There Is More Than One Valve, One May Be 3% Above S.W.P When Boiler Are Connected To A Common Steam Header And Operate Under The Same Pressure: A) No Valve May Be Set Higher The The S.W.P. Of The Weakest Boiler B) All Valves May Be Set 20% Higher Than The Lowest S.W.P. C) Some Valves May Be Set 20% Higher Than The Lowest S.W.P. D) Set Valves According To The S.W.P. Of Each Individual Boiler
A) No Valve May Be Set Higher The The S.W.P. Of The Weakest Boiler Blow Back Is: A) Number Of Minutes The Valve Operated Before Closing B) Volume Of Steam Discharged C) Difference Between The Popping And Closing Points Of The Safety Valve D) Pressure When Valve Closes C) Difference Between The Popping And Closing Points Of The Safety Valve When Two Or More Safety Valves Are Used On A Boiler, They May Be Mounted: A) On A "T" B) On A "Y" C) On A Cross B) On A "Y" Chattering Or Rumbling Of A Safety Valve May Be Due To: A) Steam Too Wet B) Broken Spring C) Dirt Or Scale On A Valve Seat Or Disc D) Valve Coming Loose From Boiler
