SPECIAL BOILER COMPREHENSIVE EXAM UPDATED
QUESTIONS AND ANSWERS GUARANTEE A+
✔✔Safety valves on steam boilers should be manually tested - ✔✔once a month
✔✔Safety valves on a low-pressure boiler should be manually tested - ✔✔quarterly
✔✔When 2 or more steam valves are located on a steam header line, there must be a
______ located between the 2 valves - ✔✔drain valve
✔✔When 2 valves are used on bottom blow-down line of a steam boiler, the
___________ is located closest to the boiler - ✔✔quick-opening valve
✔✔On a slow-opening blow-down valve, it is required to have ________ turns from fully
closed to fully open - ✔✔5 360 degree
✔✔Temperature of water leaving the blow-down tank and entering a sanitary sewer
system must not exceed _______ degrees Fahrenheit - ✔✔150
✔✔Blow-off valves for pressures in excess of 200 psi working pressure must be made
of - ✔✔steel
✔✔High pressure boilers require _______ means of feeding water into the boiler - ✔✔2
✔✔What type of plant can Special license work at? - ✔✔any type of plant
✔✔What type of plant can a Grade C license work at? - ✔✔Low-pressure steam or hot
water
✔✔What type of plant can a Grade B license work at? - ✔✔High-pressure or low-
pressure steam or hot water
✔✔What type of plant can a Grade A license work at? - ✔✔Any plant with steam
engines/turbines
✔✔Special horsepower capabilities - ✔✔Take charge person - 50 HP
Shift engineer - 100HP
✔✔2nd Class horsepower capabilities - ✔✔Take charge person - 100 HP
Shift engineer - 500 HP
✔✔1st Class horsepower capabilities - ✔✔Take charge person - 500 HP
Shift engineer - Unlimited HP
, ✔✔Chief class horsepower capabilities - ✔✔Take charge person - unlimited HP
Shift engineer - unlimited HP
✔✔Types of boilers - ✔✔Cast iron section, fire tube, water tube
✔✔What are boiler stays? - ✔✔Solid metal rods that prevent bulging in areas of the
boiler NOT supported by tubes
✔✔Why are fire tube boilers more dangerous than water tube boilers? - ✔✔Because
they store more water while operating
✔✔What are the 2 drums in a water tube boiler? - ✔✔Top drum - steam drum
Bottom drum - mud/water drum
✔✔Relief valves needed for <100 psi - ✔✔1
✔✔Relief valves needed for >100 psi - ✔✔2
✔✔Longitudinal joint - ✔✔the joint that is subject to the greatest stress during operation
✔✔What is the breeching? - ✔✔exhaust pipe between the boiler and stack (chimney)
✔✔Superheater - ✔✔increases efficiency and helps run longer
✔✔Types of water tube boilers - ✔✔Type D
Type O
Type A
✔✔Atmospheric pressure - ✔✔14.7 psia
✔✔Pyrometers - ✔✔-Measure very high temperature
-located in the breeching
✔✔BTU - ✔✔-British Thermal Unit
-amount of energy needed to increase temperature of one pound of water by one
degree F
✔✔Sensible heat - ✔✔Causes temperature to increase
✔✔Latent heat - ✔✔Causes a physical change in stage or phase with no change in
temperature
QUESTIONS AND ANSWERS GUARANTEE A+
✔✔Safety valves on steam boilers should be manually tested - ✔✔once a month
✔✔Safety valves on a low-pressure boiler should be manually tested - ✔✔quarterly
✔✔When 2 or more steam valves are located on a steam header line, there must be a
______ located between the 2 valves - ✔✔drain valve
✔✔When 2 valves are used on bottom blow-down line of a steam boiler, the
___________ is located closest to the boiler - ✔✔quick-opening valve
✔✔On a slow-opening blow-down valve, it is required to have ________ turns from fully
closed to fully open - ✔✔5 360 degree
✔✔Temperature of water leaving the blow-down tank and entering a sanitary sewer
system must not exceed _______ degrees Fahrenheit - ✔✔150
✔✔Blow-off valves for pressures in excess of 200 psi working pressure must be made
of - ✔✔steel
✔✔High pressure boilers require _______ means of feeding water into the boiler - ✔✔2
✔✔What type of plant can Special license work at? - ✔✔any type of plant
✔✔What type of plant can a Grade C license work at? - ✔✔Low-pressure steam or hot
water
✔✔What type of plant can a Grade B license work at? - ✔✔High-pressure or low-
pressure steam or hot water
✔✔What type of plant can a Grade A license work at? - ✔✔Any plant with steam
engines/turbines
✔✔Special horsepower capabilities - ✔✔Take charge person - 50 HP
Shift engineer - 100HP
✔✔2nd Class horsepower capabilities - ✔✔Take charge person - 100 HP
Shift engineer - 500 HP
✔✔1st Class horsepower capabilities - ✔✔Take charge person - 500 HP
Shift engineer - Unlimited HP
, ✔✔Chief class horsepower capabilities - ✔✔Take charge person - unlimited HP
Shift engineer - unlimited HP
✔✔Types of boilers - ✔✔Cast iron section, fire tube, water tube
✔✔What are boiler stays? - ✔✔Solid metal rods that prevent bulging in areas of the
boiler NOT supported by tubes
✔✔Why are fire tube boilers more dangerous than water tube boilers? - ✔✔Because
they store more water while operating
✔✔What are the 2 drums in a water tube boiler? - ✔✔Top drum - steam drum
Bottom drum - mud/water drum
✔✔Relief valves needed for <100 psi - ✔✔1
✔✔Relief valves needed for >100 psi - ✔✔2
✔✔Longitudinal joint - ✔✔the joint that is subject to the greatest stress during operation
✔✔What is the breeching? - ✔✔exhaust pipe between the boiler and stack (chimney)
✔✔Superheater - ✔✔increases efficiency and helps run longer
✔✔Types of water tube boilers - ✔✔Type D
Type O
Type A
✔✔Atmospheric pressure - ✔✔14.7 psia
✔✔Pyrometers - ✔✔-Measure very high temperature
-located in the breeching
✔✔BTU - ✔✔-British Thermal Unit
-amount of energy needed to increase temperature of one pound of water by one
degree F
✔✔Sensible heat - ✔✔Causes temperature to increase
✔✔Latent heat - ✔✔Causes a physical change in stage or phase with no change in
temperature
