Commercial Boilers Final Exam UPDATED
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Which unit of measurement is used to measure mechanical potential energy? - CORRECT
ANSWER Foot-pounds
Heat which brings about a change in the physical state of a substance without a change in
temperature, is called ______. - CORRECT ANSWER latent heat
Which of the listed methods of heat transfer takes place when two substances of different
temperatures are in physical contact with each other? - CORRECT
ANSWER conduction
Which line on the graph shown in the illustration indicates latent heat of fusion? See
illustration SG-0001. - CORRECT ANSWER Line 2
The sum of the sensible heat and the latent heat of any substance is known as _____. -
CORRECT ANSWER total heat
Which of the following modes of heat transfer does NOT require any physical contact
between a warmer and a cooler substance? - CORRECT ANSWER Radiation
When vapor is in contact with and remains at the same temperature as the boiling liquid from
which it was generated, the vapor and liquid are said to be in a/an ___. - CORRECT
ANSWER saturated condition
Steam tables can be used to obtain the _____. - CORRECT ANSWER values for
properties of water and steam vapor at various conditions
,The heat required to change a substance from a solid to a liquid while at its freezing
temperature, is known as the latent heat of ____. - CORRECT ANSWER fusion
Which of the following terms could be applied to the simple definition the energy of motion'?
- CORRECT ANSWER Kinetic Energy
When the boiling temperature of a steam boiler is increased, which of the following effects
will occur with relation to the pressure and the specific volume of the steam? - CORRECT
ANSWER The steam pressure will increase and the specific volume will decrease.
Which of the following forms of energy is released through the process of fuel combustion? -
CORRECT ANSWER Chemical energy
The heat identified by only a change in temperature is known as ____. - CORRECT
ANSWER sensible heat
Which of the listed values represents the temperature of saturated vapor for water at a
pressure of 14.7 psia? - CORRECT ANSWER 212°F (100°C)
Which of the following terms is used to indicate that additional BTU's will result in a
temperature change? - CORRECT ANSWER Sensible heat
The energy associated with atoms forming molecules is known as____. - CORRECT
ANSWER Chemical Energy
As steam accomplishes work in an engine or turbine, the pressure of the steam is reduced
because it _____. - CORRECT ANSWER expands in volume
The heat required to change a substance from a liquid to a gas without experiencing a
temperature change, is defined as the latent heat of ____. - CORRECT
ANSWER vaporization
, Which of the following terms would best describe the temperature at which a liquid boils at a
given pressure? - CORRECT ANSWER Saturation temperature
In which of the listed components is chemical energy converted to thermal energy with
regards to boiler operation? - CORRECT ANSWER Furnace
A Boiler Horsepower is defined as ____. - CORRECT ANSWER Evaporation of 34.5
lb. of water from and at 212 degrees per 8 hours2
A boiler's steam pressure gauge reads 150. What is the absolute pressure? - CORRECT
ANSWER 164.7
One Boiler horsepower is equal to how many BTU's? - CORRECT ANSWER 33,472
2,545 BTU represents - CORRECT ANSWER I horsepower-hr
The purpose of a staybolt is to ____. - CORRECT ANSWER Strengthen and support
flat plates of a fire-tube boiler
How are tubes secured in. fire-tube boiler? - CORRECT ANSWER rolled and beaded
over
In a water-tube boiler, ___. - CORRECT ANSWER Flue gas surrounds the tube
A high pressure boiler has its safety valve set above ___. - CORRECT ANSWER 15
psi
Which of the following is an advantage of a fire-tube boiler over a water-tube boiler? -
CORRECT ANSWER Low initial cost
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Which unit of measurement is used to measure mechanical potential energy? - CORRECT
ANSWER Foot-pounds
Heat which brings about a change in the physical state of a substance without a change in
temperature, is called ______. - CORRECT ANSWER latent heat
Which of the listed methods of heat transfer takes place when two substances of different
temperatures are in physical contact with each other? - CORRECT
ANSWER conduction
Which line on the graph shown in the illustration indicates latent heat of fusion? See
illustration SG-0001. - CORRECT ANSWER Line 2
The sum of the sensible heat and the latent heat of any substance is known as _____. -
CORRECT ANSWER total heat
Which of the following modes of heat transfer does NOT require any physical contact
between a warmer and a cooler substance? - CORRECT ANSWER Radiation
When vapor is in contact with and remains at the same temperature as the boiling liquid from
which it was generated, the vapor and liquid are said to be in a/an ___. - CORRECT
ANSWER saturated condition
Steam tables can be used to obtain the _____. - CORRECT ANSWER values for
properties of water and steam vapor at various conditions
,The heat required to change a substance from a solid to a liquid while at its freezing
temperature, is known as the latent heat of ____. - CORRECT ANSWER fusion
Which of the following terms could be applied to the simple definition the energy of motion'?
- CORRECT ANSWER Kinetic Energy
When the boiling temperature of a steam boiler is increased, which of the following effects
will occur with relation to the pressure and the specific volume of the steam? - CORRECT
ANSWER The steam pressure will increase and the specific volume will decrease.
Which of the following forms of energy is released through the process of fuel combustion? -
CORRECT ANSWER Chemical energy
The heat identified by only a change in temperature is known as ____. - CORRECT
ANSWER sensible heat
Which of the listed values represents the temperature of saturated vapor for water at a
pressure of 14.7 psia? - CORRECT ANSWER 212°F (100°C)
Which of the following terms is used to indicate that additional BTU's will result in a
temperature change? - CORRECT ANSWER Sensible heat
The energy associated with atoms forming molecules is known as____. - CORRECT
ANSWER Chemical Energy
As steam accomplishes work in an engine or turbine, the pressure of the steam is reduced
because it _____. - CORRECT ANSWER expands in volume
The heat required to change a substance from a liquid to a gas without experiencing a
temperature change, is defined as the latent heat of ____. - CORRECT
ANSWER vaporization
, Which of the following terms would best describe the temperature at which a liquid boils at a
given pressure? - CORRECT ANSWER Saturation temperature
In which of the listed components is chemical energy converted to thermal energy with
regards to boiler operation? - CORRECT ANSWER Furnace
A Boiler Horsepower is defined as ____. - CORRECT ANSWER Evaporation of 34.5
lb. of water from and at 212 degrees per 8 hours2
A boiler's steam pressure gauge reads 150. What is the absolute pressure? - CORRECT
ANSWER 164.7
One Boiler horsepower is equal to how many BTU's? - CORRECT ANSWER 33,472
2,545 BTU represents - CORRECT ANSWER I horsepower-hr
The purpose of a staybolt is to ____. - CORRECT ANSWER Strengthen and support
flat plates of a fire-tube boiler
How are tubes secured in. fire-tube boiler? - CORRECT ANSWER rolled and beaded
over
In a water-tube boiler, ___. - CORRECT ANSWER Flue gas surrounds the tube
A high pressure boiler has its safety valve set above ___. - CORRECT ANSWER 15
psi
Which of the following is an advantage of a fire-tube boiler over a water-tube boiler? -
CORRECT ANSWER Low initial cost
