MINNESOTA SPECIAL ENGINEER BOILER
LICENSE 2026 MASTER STUDY EXAM
◉ when not more than two valves of different sizes are mounted
singly. the relieving capacity of the smaller valve shall not be less
than _______ percent of the larger valve.
a) 20%
b) 35%
c) 50%
d) 70. Answer: c) 50%
◉ the safety valve or valves shall be connected to the boiler
independent of any steam connection.
a) if under 100psi
b) always
c) if furnace is stoker fired
d) if required by inspector Answer: b) always
◉ 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 Answer: 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 Answer: 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 Answer: 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% Answer: 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% Answer: b) 5% above or 5%
◉ every attached super-heater shall have one or more safety relief
valves:
a) near the outlet
b) between boiler and super-heater
c) between super-heater and turbine or engine
d) if steam is used to operate turbine Answer: a) near the outlet
◉ safety valves used on a super-heater discharging super-heated
steam at a temperature over 450 degrees F shall have a body bonnet
and be made of:
a) brass
, b) cast iron
c) malleable iron
d) steel alloy Answer: d) steel alloy
◉ the spring in a super-heater discharging super-heated steam at a
temperature over 450 degrees F, must be :
a) outside the valve casting
b) inside the valve casting
c) doesn't make any difference
d) spring is not used Answer: a) outside the valve casting
◉ 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 Answer: 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
LICENSE 2026 MASTER STUDY EXAM
◉ when not more than two valves of different sizes are mounted
singly. the relieving capacity of the smaller valve shall not be less
than _______ percent of the larger valve.
a) 20%
b) 35%
c) 50%
d) 70. Answer: c) 50%
◉ the safety valve or valves shall be connected to the boiler
independent of any steam connection.
a) if under 100psi
b) always
c) if furnace is stoker fired
d) if required by inspector Answer: b) always
◉ 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 Answer: 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 Answer: 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 Answer: 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% Answer: 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% Answer: b) 5% above or 5%
◉ every attached super-heater shall have one or more safety relief
valves:
a) near the outlet
b) between boiler and super-heater
c) between super-heater and turbine or engine
d) if steam is used to operate turbine Answer: a) near the outlet
◉ safety valves used on a super-heater discharging super-heated
steam at a temperature over 450 degrees F shall have a body bonnet
and be made of:
a) brass
, b) cast iron
c) malleable iron
d) steel alloy Answer: d) steel alloy
◉ the spring in a super-heater discharging super-heated steam at a
temperature over 450 degrees F, must be :
a) outside the valve casting
b) inside the valve casting
c) doesn't make any difference
d) spring is not used Answer: a) outside the valve casting
◉ 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 Answer: 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
