Maryland Boiler License EXAM
2025/2026 COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<LATEST VERSION>
1. The number of blowdowns required is determined by ? - ANSWER ✓ boiler
water analysis
2. A vacuum pump is a boiler accessory used to draw condensate back from the
system by producing negative pressure on the condensate return lines. -
ANSWER ✓ vacuum
3. Oxygen in the boiler water causes? - ANSWER ✓ pitting
4. A therm is equivalent to ? - ANSWER ✓ 100,000 BTU
5. A _______ draft fan is located before the furnace. - ANSWER ✓ forced
6. Impurities that increase the surface tension of boiler water are removed with
a _______ blowdown. - ANSWER ✓ surface
7. The primary function of the water column on a low pressure boiler is to
reduce ? - ANSWER ✓ Water turbulence
8. In a watertube boiler, the _______ pass(es) through the tubes and the
________ pass(es) across the outside surface of the tubes. - ANSWER ✓
water / combustion gases
,9. The three most common fuels used in steam production are ? - ANSWER ✓
Natrual gas, fuel oil and propane
10.True or false: In a natural draft furnace, the amount of draft is affected by
the height of the stack. - ANSWER ✓ True
11.Fuel oil grades commonly used in boilers are designated by _______ for the
lightest grade of fuel oil through ________ for the heaviest grade of fuel oil.
- ANSWER ✓ No. 2 & No 6
12.A boiler has quick- and slow-opening blowdown valves. The sequence used
for a blowdown is ? - ANSWER ✓ open quick-opening, open slow-opening,
close slow-opening, close quick-opening.
13.all steam boilers must have - ANSWER ✓ 1 or more safety valves
14.the induced draft fan is located between the boiler & the - ANSWER ✓
Chimney
15.the flash point of fuel oil is the minimum temperature at which the fuel will -
ANSWER ✓ Flash when exposed to an open flame
16.the fire point of fuel oil is the minimum temperature at which the fuel will -
ANSWER ✓ Burn continually
17.the pour point of fuel oil is the ____ temperature at which fuel oil will ____
- ANSWER ✓ Lowest; flow
18.thin pieces that attach tubes and keep the correct space between tubes in a
tube sheet - ANSWER ✓ boiler ligament
19.used to support flat surfaces in a boiler, the internal pressure will be
contained without distortion - ANSWER ✓ boiler stays
20.rod, girder, longitudinal, gusset, bolt, sling - ANSWER ✓ stay examples
21.the portion of the tube that sticks out is curled outward and back until it
touches the tubesheet - ANSWER ✓ beading
,22.rolled or welded - ANSWER ✓ tubes attached to drum via
23.removal of air or other gases from feedwater by increasing the temperature
& stripping out the gases - ANSWER ✓ deaeration
24.method for processing water by forcing it through a membrane through
which salts & impurities cannot pass - ANSWER ✓ reverse osmosis
25.uses ion exchange to remove mineral salts - ANSWER ✓ demineralization
26.removes dissolved mineral salts (such as calcium & magnesium which cause
hardness) - ANSWER ✓ softening
27.concentrating & removing suspended solids in boiler feedwater by adding
chemicals which cause the impurities to cling together - ANSWER ✓
coagulation
28.causes water to carry over into steam distribution system which can damage
downstream equipment - ANSWER ✓ high water level in steam drum
29.causes loss of pumps & draft fans - ANSWER ✓ power outage
30.causes overheating & failure of the tubes - ANSWER ✓ burner flame
impingement or poor flame distribution
31.causes creation or increase in soot deposits on tubes causing excessively
high temperature on tube walls - ANSWER ✓ change in fuel flow
32.before anyone enters the boiler drum, the main steam stop valve, bottom
blowdown valves, & feedwater valves should be - ANSWER ✓ Locked
closed
33.at atmospheric pressure, water begins to boil at approximately - ANSWER
✓ 212 degrees F
34.fuels most commonly used in boilers - ANSWER ✓ Fuel oil, gas, & coal
, 35.must be connected to the highest part of the steam side of the boiler -
ANSWER ✓ Steam pressure gauge
36.with an NOWL in a boiler, the gauge glass is approximately - ANSWER ✓
Half full
37.a high surface tension on top of the boiler water can lead to - ANSWER ✓
Foaming
38.Bottom blowdown on a boiler removes sludge & sediment from the -
ANSWER ✓ Mud drum
39.a boiler fusible plug is brass or bronze with a core of - ANSWER ✓ Tin
40.a steam pressure gauge is calibrated in - ANSWER ✓ Pounds per square
inch
41.a secondary means of determining boiler water level - ANSWER ✓ Try
cocks
42.fires caused by spontaneous combustion are most likely to occur in the -
ANSWER ✓ Oily waste rag storage
43.a siphon installed between the boiler & the pressure gauge protects the
Bourdon tube from - ANSWER ✓ Steam
44.boiler feedwater is chemically treated to - ANSWER ✓ Prevent formation of
scale
45.in a firetube boiler, soot accumulates on the - ANSWER ✓ Inside tube
surface
46.the pressure applied on the boiler during a hydrostatic test should be -
ANSWER ✓ 1.5 times the MAWP
47.as fuel oil is heated, its viscosity is - ANSWER ✓ Decreased
2025/2026 COMPLETE QUESTIONS WITH
CORRECT DETAILED ANSWERS ||
100% GUARANTEED PASS
<LATEST VERSION>
1. The number of blowdowns required is determined by ? - ANSWER ✓ boiler
water analysis
2. A vacuum pump is a boiler accessory used to draw condensate back from the
system by producing negative pressure on the condensate return lines. -
ANSWER ✓ vacuum
3. Oxygen in the boiler water causes? - ANSWER ✓ pitting
4. A therm is equivalent to ? - ANSWER ✓ 100,000 BTU
5. A _______ draft fan is located before the furnace. - ANSWER ✓ forced
6. Impurities that increase the surface tension of boiler water are removed with
a _______ blowdown. - ANSWER ✓ surface
7. The primary function of the water column on a low pressure boiler is to
reduce ? - ANSWER ✓ Water turbulence
8. In a watertube boiler, the _______ pass(es) through the tubes and the
________ pass(es) across the outside surface of the tubes. - ANSWER ✓
water / combustion gases
,9. The three most common fuels used in steam production are ? - ANSWER ✓
Natrual gas, fuel oil and propane
10.True or false: In a natural draft furnace, the amount of draft is affected by
the height of the stack. - ANSWER ✓ True
11.Fuel oil grades commonly used in boilers are designated by _______ for the
lightest grade of fuel oil through ________ for the heaviest grade of fuel oil.
- ANSWER ✓ No. 2 & No 6
12.A boiler has quick- and slow-opening blowdown valves. The sequence used
for a blowdown is ? - ANSWER ✓ open quick-opening, open slow-opening,
close slow-opening, close quick-opening.
13.all steam boilers must have - ANSWER ✓ 1 or more safety valves
14.the induced draft fan is located between the boiler & the - ANSWER ✓
Chimney
15.the flash point of fuel oil is the minimum temperature at which the fuel will -
ANSWER ✓ Flash when exposed to an open flame
16.the fire point of fuel oil is the minimum temperature at which the fuel will -
ANSWER ✓ Burn continually
17.the pour point of fuel oil is the ____ temperature at which fuel oil will ____
- ANSWER ✓ Lowest; flow
18.thin pieces that attach tubes and keep the correct space between tubes in a
tube sheet - ANSWER ✓ boiler ligament
19.used to support flat surfaces in a boiler, the internal pressure will be
contained without distortion - ANSWER ✓ boiler stays
20.rod, girder, longitudinal, gusset, bolt, sling - ANSWER ✓ stay examples
21.the portion of the tube that sticks out is curled outward and back until it
touches the tubesheet - ANSWER ✓ beading
,22.rolled or welded - ANSWER ✓ tubes attached to drum via
23.removal of air or other gases from feedwater by increasing the temperature
& stripping out the gases - ANSWER ✓ deaeration
24.method for processing water by forcing it through a membrane through
which salts & impurities cannot pass - ANSWER ✓ reverse osmosis
25.uses ion exchange to remove mineral salts - ANSWER ✓ demineralization
26.removes dissolved mineral salts (such as calcium & magnesium which cause
hardness) - ANSWER ✓ softening
27.concentrating & removing suspended solids in boiler feedwater by adding
chemicals which cause the impurities to cling together - ANSWER ✓
coagulation
28.causes water to carry over into steam distribution system which can damage
downstream equipment - ANSWER ✓ high water level in steam drum
29.causes loss of pumps & draft fans - ANSWER ✓ power outage
30.causes overheating & failure of the tubes - ANSWER ✓ burner flame
impingement or poor flame distribution
31.causes creation or increase in soot deposits on tubes causing excessively
high temperature on tube walls - ANSWER ✓ change in fuel flow
32.before anyone enters the boiler drum, the main steam stop valve, bottom
blowdown valves, & feedwater valves should be - ANSWER ✓ Locked
closed
33.at atmospheric pressure, water begins to boil at approximately - ANSWER
✓ 212 degrees F
34.fuels most commonly used in boilers - ANSWER ✓ Fuel oil, gas, & coal
, 35.must be connected to the highest part of the steam side of the boiler -
ANSWER ✓ Steam pressure gauge
36.with an NOWL in a boiler, the gauge glass is approximately - ANSWER ✓
Half full
37.a high surface tension on top of the boiler water can lead to - ANSWER ✓
Foaming
38.Bottom blowdown on a boiler removes sludge & sediment from the -
ANSWER ✓ Mud drum
39.a boiler fusible plug is brass or bronze with a core of - ANSWER ✓ Tin
40.a steam pressure gauge is calibrated in - ANSWER ✓ Pounds per square
inch
41.a secondary means of determining boiler water level - ANSWER ✓ Try
cocks
42.fires caused by spontaneous combustion are most likely to occur in the -
ANSWER ✓ Oily waste rag storage
43.a siphon installed between the boiler & the pressure gauge protects the
Bourdon tube from - ANSWER ✓ Steam
44.boiler feedwater is chemically treated to - ANSWER ✓ Prevent formation of
scale
45.in a firetube boiler, soot accumulates on the - ANSWER ✓ Inside tube
surface
46.the pressure applied on the boiler during a hydrostatic test should be -
ANSWER ✓ 1.5 times the MAWP
47.as fuel oil is heated, its viscosity is - ANSWER ✓ Decreased
