CITY OF OMAHA STATIONARY ENGINEER
FIRST GRADE 2026 COMPREHENSIVE
STUDY GUIDE QUESTIONS AND ANSWERS
FULL SOLUTION GRADED A+
⩥ Which test is used to measure hardness?
Answer: soap test
⩥ Which water test uses a color comparison test?
Answer: Phosphate
⩥ What phosphate residual should be carried in the boiler water?
Answer: 40 ppm or less
⩥ What is the maximum recommended concentration of calcium
chloride in the boiler
if the boiler feedwater normally averages 6 ppm of calcium chloride?
Answer: 60 ppm
⩥ List one thing that a bottom blowdown does NOT do
Answer: Help a low water problem
,⩥ When no boiler water analysis is made, what is the recommended
frequency of
boiler blowdown per the ASME Code?
Answer: every 24 hrs
⩥ When must a boiler have two bottom blowdown valves?
Answer: if the pressure is greater than 100psi
⩥ What is the MAXIMUM pressure for which a seatless-type blowdown
valve is
used?
Answer: 450 psi
⩥ Where does water leave the blowdown tank
Answer: the bottom
⩥ What system is directly piped into your boiler flash tank?
Answer: Continious blowdown
⩥ If you lay up a boiler for a short time, what concentration of caustic
soda should be
maintained in the boiler water?
Answer: 400 ppm
, ⩥ When laying up a boiler for a long period of time, trays of what
material are placed
inside the boiler?
Answer: quick lime, hydrated lime
⩥ what is the purpose of silica gel
Answer: absorb moisture during boiler dry lay up
⩥ When laying up a boiler in a dry state, which of the following is NOT
used as a
desiccant?
Answer: caustic soda
⩥ Incomplete combustion is a cause of
Answer: soot accumulation
⩥ Adding water to promote combustion in coal fired boiler is called
Answer: tempering
⩥ What is the secret to achieving smokeless combustion (or "a colorless
smokestack"?)
FIRST GRADE 2026 COMPREHENSIVE
STUDY GUIDE QUESTIONS AND ANSWERS
FULL SOLUTION GRADED A+
⩥ Which test is used to measure hardness?
Answer: soap test
⩥ Which water test uses a color comparison test?
Answer: Phosphate
⩥ What phosphate residual should be carried in the boiler water?
Answer: 40 ppm or less
⩥ What is the maximum recommended concentration of calcium
chloride in the boiler
if the boiler feedwater normally averages 6 ppm of calcium chloride?
Answer: 60 ppm
⩥ List one thing that a bottom blowdown does NOT do
Answer: Help a low water problem
,⩥ When no boiler water analysis is made, what is the recommended
frequency of
boiler blowdown per the ASME Code?
Answer: every 24 hrs
⩥ When must a boiler have two bottom blowdown valves?
Answer: if the pressure is greater than 100psi
⩥ What is the MAXIMUM pressure for which a seatless-type blowdown
valve is
used?
Answer: 450 psi
⩥ Where does water leave the blowdown tank
Answer: the bottom
⩥ What system is directly piped into your boiler flash tank?
Answer: Continious blowdown
⩥ If you lay up a boiler for a short time, what concentration of caustic
soda should be
maintained in the boiler water?
Answer: 400 ppm
, ⩥ When laying up a boiler for a long period of time, trays of what
material are placed
inside the boiler?
Answer: quick lime, hydrated lime
⩥ what is the purpose of silica gel
Answer: absorb moisture during boiler dry lay up
⩥ When laying up a boiler in a dry state, which of the following is NOT
used as a
desiccant?
Answer: caustic soda
⩥ Incomplete combustion is a cause of
Answer: soot accumulation
⩥ Adding water to promote combustion in coal fired boiler is called
Answer: tempering
⩥ What is the secret to achieving smokeless combustion (or "a colorless
smokestack"?)
