CITY OF OMAHA STATIONARY ENGINEER
FIRST GRADE 2026 CERTIFICATION
EVALUATION QUESTIONS AND CORRECT
ANSWERS VERIFIED CONTENT GRADED A+
⩥ What must you do if you change jobs?
Answer: You must notify city hall if you change jobs, change your
address or if you retire
⩥ Why should you do rounds?
Answer: You do rounds so that you can find and correct problems to
prevent break downs. Keeping permanent records will make it easier to
forecast most breakdowns because you will get to know your equipment.
⩥ What is a steam Boiler?
Answer: A steam boiler is a closed vessel PARTIALLY FILLED with
water, under pressure, that transforms water into steam with the
application of heat.
⩥ What are requirements of a good boiler?
Answer: 1. simple
2. designed to accommodate expansion and contraction
3. adequate steam and water space
,4. efficient
5. responsive to demands
6. accessible for cleaning and repair
7. safe
⩥ Name and describe three types of heat transfer used in boiler
operation.
Answer: RADIANT HEAT-is heat radiated from a hot to cold body and
depends on the temperature difference and the color of the body that
receives the heat. The heat from the sun reaches us by means of
radiation.
CONDUCTION HEAT-is heat that passes from the gas to the tube by
physical contact. The heat passes from molecule of metal to molecule of
metal with no displacement of the molecules.
CONVECTION HEAT-is heat transmitted from a hot to cold body by
movement of the conveying substance.
⩥ What is a combustion chamber?
Answer: The area of a boiler where the burning of fuel occurs
⩥ What is an internally fired boiler and name 4 types.
, Answer: Internally fired boilers are those in which the grate and
combustion chamber are enclosed within the boiler shell.
Scotch Marine
Cast iron package
Steam locomotive
Vertical fire tube
⩥ What is an externally fired boiler and name 4 types.
Answer: Externally fired boiler is a boiler in which the setting, including
furnace and grates are separate and distinct from the boiler shell.
Horizontal return tube set on brick
Heine
Cast iron set on brick
Sterling water tube
⩥ What is a crown sheet and what is its purpose? What is a tube sheet
and what is its purpose?
Answer: The crown sheet in a vertical fire tube boiler holds the tubes
and is thicker because it is exposed to fire.
The tube sheet holds the tubes and does not see the fire.
FIRST GRADE 2026 CERTIFICATION
EVALUATION QUESTIONS AND CORRECT
ANSWERS VERIFIED CONTENT GRADED A+
⩥ What must you do if you change jobs?
Answer: You must notify city hall if you change jobs, change your
address or if you retire
⩥ Why should you do rounds?
Answer: You do rounds so that you can find and correct problems to
prevent break downs. Keeping permanent records will make it easier to
forecast most breakdowns because you will get to know your equipment.
⩥ What is a steam Boiler?
Answer: A steam boiler is a closed vessel PARTIALLY FILLED with
water, under pressure, that transforms water into steam with the
application of heat.
⩥ What are requirements of a good boiler?
Answer: 1. simple
2. designed to accommodate expansion and contraction
3. adequate steam and water space
,4. efficient
5. responsive to demands
6. accessible for cleaning and repair
7. safe
⩥ Name and describe three types of heat transfer used in boiler
operation.
Answer: RADIANT HEAT-is heat radiated from a hot to cold body and
depends on the temperature difference and the color of the body that
receives the heat. The heat from the sun reaches us by means of
radiation.
CONDUCTION HEAT-is heat that passes from the gas to the tube by
physical contact. The heat passes from molecule of metal to molecule of
metal with no displacement of the molecules.
CONVECTION HEAT-is heat transmitted from a hot to cold body by
movement of the conveying substance.
⩥ What is a combustion chamber?
Answer: The area of a boiler where the burning of fuel occurs
⩥ What is an internally fired boiler and name 4 types.
, Answer: Internally fired boilers are those in which the grate and
combustion chamber are enclosed within the boiler shell.
Scotch Marine
Cast iron package
Steam locomotive
Vertical fire tube
⩥ What is an externally fired boiler and name 4 types.
Answer: Externally fired boiler is a boiler in which the setting, including
furnace and grates are separate and distinct from the boiler shell.
Horizontal return tube set on brick
Heine
Cast iron set on brick
Sterling water tube
⩥ What is a crown sheet and what is its purpose? What is a tube sheet
and what is its purpose?
Answer: The crown sheet in a vertical fire tube boiler holds the tubes
and is thicker because it is exposed to fire.
The tube sheet holds the tubes and does not see the fire.
