First Class Firemans Questions With Complete Solutions
At what percent of the Maximum allowable working pressure is
it recommended to hand lift a safety valve? Correct Answers 75
percent
Can a 1st class fireman operate a steam driven feed pump with a
3 inch supply line ? Correct Answers Yes , up to 3.5 inch is a
third class plant so under the law he can operate it but not have
charge of it
Explain the operation of a huddling chamber Correct Answers
Is the space between the blowback ring and the valve seat on a
safety valve this space can be adjusted to determine the
blowback it operates by directing a portion of the steam velocity
against the disks protruding lip causing the valve to pop
How does a Dearator feed water heater work ? Correct Answers
Water is heated by the direct contact between the feed water and
the turbine extraction
How does chapter 146 determine boiler horsepower? Correct
Answers 1. Manufacturers tag if available
2. Steak output dived by 34.5
3. British thermal unit and hour input divided by 41,840
4. British thermal unit and hour output divided by 33,475
How does chapter 146 determine engine horsepower ? Correct
Answers By the formula : P.L.A.N. divided by 33,000 . P=
pressure constant . L = length of stroke , A = area of the high
pressure piston , N = number of strokes per minute .
, How does chapter 146 determine turbine horsepower? Correct
Answers By the outside diameter of the steam supply pipe
How is draft measured ? Correct Answers Inches of water
How is scale formed in a boiler ? Correct Answers Is caused by
impurities in the water which are almost up of salts of calcium
and magnesium and silica which are left there when we boil
water, take out steam , then add more water
How many Btu's are required to raise water from 32 degrees to
212 degrees Correct Answers 180 BTU's
How many BTU's is required to change 1 pound of water to 1
pound of steam at atmospheric pressure Correct Answers 970.3
How many gallons in a cubic foot of water ? Correct Answers
7.48
How much does a gallon of water weigh ? Correct Answers
8.33 lbs
How much pressure does a foot of water exert? Correct Answers
.433 psi
How often are air tanks inspected? Correct Answers Every two
years internally and externally
What are the parts of a centrifugal pump ? Correct Answers *
vanes
At what percent of the Maximum allowable working pressure is
it recommended to hand lift a safety valve? Correct Answers 75
percent
Can a 1st class fireman operate a steam driven feed pump with a
3 inch supply line ? Correct Answers Yes , up to 3.5 inch is a
third class plant so under the law he can operate it but not have
charge of it
Explain the operation of a huddling chamber Correct Answers
Is the space between the blowback ring and the valve seat on a
safety valve this space can be adjusted to determine the
blowback it operates by directing a portion of the steam velocity
against the disks protruding lip causing the valve to pop
How does a Dearator feed water heater work ? Correct Answers
Water is heated by the direct contact between the feed water and
the turbine extraction
How does chapter 146 determine boiler horsepower? Correct
Answers 1. Manufacturers tag if available
2. Steak output dived by 34.5
3. British thermal unit and hour input divided by 41,840
4. British thermal unit and hour output divided by 33,475
How does chapter 146 determine engine horsepower ? Correct
Answers By the formula : P.L.A.N. divided by 33,000 . P=
pressure constant . L = length of stroke , A = area of the high
pressure piston , N = number of strokes per minute .
, How does chapter 146 determine turbine horsepower? Correct
Answers By the outside diameter of the steam supply pipe
How is draft measured ? Correct Answers Inches of water
How is scale formed in a boiler ? Correct Answers Is caused by
impurities in the water which are almost up of salts of calcium
and magnesium and silica which are left there when we boil
water, take out steam , then add more water
How many Btu's are required to raise water from 32 degrees to
212 degrees Correct Answers 180 BTU's
How many BTU's is required to change 1 pound of water to 1
pound of steam at atmospheric pressure Correct Answers 970.3
How many gallons in a cubic foot of water ? Correct Answers
7.48
How much does a gallon of water weigh ? Correct Answers
8.33 lbs
How much pressure does a foot of water exert? Correct Answers
.433 psi
How often are air tanks inspected? Correct Answers Every two
years internally and externally
What are the parts of a centrifugal pump ? Correct Answers *
vanes
