Page 1 of 86
MN BOILER LICENSE EXAM | FREQUENTLY
TESTED QUESTIONS WITH CORRECT
ANSWERS | BRAND NEW!
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% - ✔✔✔ Correct 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 - ✔✔✔ Correct Answer > b) always
,Page 2 of 86
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 - ✔✔✔ Correct 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 - ✔✔✔ Correct 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 - ✔✔✔ Correct Answer > a) 4% but not
less than 2 lbs psi
,Page 3 of 86
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% - ✔✔✔ Correct 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% - ✔✔✔ Correct 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
, Page 4 of 86
D) if steam is used to operate turbine - ✔✔✔ Correct 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 - ✔✔✔ Correct 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 - ✔✔✔ Correct 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
MN BOILER LICENSE EXAM | FREQUENTLY
TESTED QUESTIONS WITH CORRECT
ANSWERS | BRAND NEW!
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% - ✔✔✔ Correct 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 - ✔✔✔ Correct Answer > b) always
,Page 2 of 86
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 - ✔✔✔ Correct 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 - ✔✔✔ Correct 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 - ✔✔✔ Correct Answer > a) 4% but not
less than 2 lbs psi
,Page 3 of 86
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% - ✔✔✔ Correct 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% - ✔✔✔ Correct 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
, Page 4 of 86
D) if steam is used to operate turbine - ✔✔✔ Correct 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 - ✔✔✔ Correct 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 - ✔✔✔ Correct 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
