Commercial Boilers Final Exam UPDATED
QUESTIONS AND CORRECT ANSWERS
Energy Existing in a system as a result of the relative velocities of the object is
a. potential energy
b. pressure energy
c. kinetic energy
d. relative energy - CORRECT ANSWER c. kinetic energy
Heat which brings about a change in the physical state of a substance without a change in
temperature, is called
a. specific heat
b. sensible heat
c. latent heat
d. ambient heat - CORRECT ANSWER c. latent heat
which of the following modes of heat transfers does NOT require any physical contact
between a warmer and a cooler substance
a. radiation
b. conduction
c. lamination
d. all of the above - CORRECT ANSWER a. radiation
as steam first enters the main propulsion turbine, which of the following energy conversions
takes place
a. potential to kinetic
,b. mechanical to thermal
c. chemical to thermal
d. thermal to chemical - CORRECT ANSWER a. potential to kinetic
Which of the following terms would best describe the temperature at which a liquid boils at a
given pressure?
a. degree of saturation
b. saturation temperature
c. superheated temperature
d. degree of superheat - CORRECT ANSWER b. saturation temperature
temperature measurement is an indication of the
a. level of heat intensity
b. total heat of a substance
c. rate of heat transfer from one substance to another
d. total heat contained in any closed energy system - CORRECT ANSWER a. level of
heat intensity
which of the following statements listed concerning heat transfer is correct?
a. heat is always transferred at a constant rate
b. heat transfer rate increases as temperature differences increases
c. the rate of heat transfer is not affected by temperature difference
d. the high temperature region is known as a heat sink - CORRECT ANSWER b. heat
transfer rate increases as temperature differences increases
which of the following statements concerning energy is correct?
, a. energy can be created or destroyed
b. energy may not be destroyed
c. the total quantity of energy in the universe is always the same
d. none of the above - CORRECT ANSWER c. the total quantity of energy in the
universe is always the same
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 ____
a. latent contact
b. critical state
c. sensible contact
d. saturated condition - CORRECT ANSWER d. saturated condition
which of the listed methods of heat transfer takes place when two substances of different
temperatures are in physical contact with each other?
a. radiation
b. conduction
c. convection
d. none of the above - CORRECT ANSWER b. conduction
in which of the listed components is chemical energy converted to thermal energy which
regards to boiler operation?
a. furnace
b. superheater
c. steam drum
d. economizer - CORRECT ANSWER a. furnace
QUESTIONS AND CORRECT ANSWERS
Energy Existing in a system as a result of the relative velocities of the object is
a. potential energy
b. pressure energy
c. kinetic energy
d. relative energy - CORRECT ANSWER c. kinetic energy
Heat which brings about a change in the physical state of a substance without a change in
temperature, is called
a. specific heat
b. sensible heat
c. latent heat
d. ambient heat - CORRECT ANSWER c. latent heat
which of the following modes of heat transfers does NOT require any physical contact
between a warmer and a cooler substance
a. radiation
b. conduction
c. lamination
d. all of the above - CORRECT ANSWER a. radiation
as steam first enters the main propulsion turbine, which of the following energy conversions
takes place
a. potential to kinetic
,b. mechanical to thermal
c. chemical to thermal
d. thermal to chemical - CORRECT ANSWER a. potential to kinetic
Which of the following terms would best describe the temperature at which a liquid boils at a
given pressure?
a. degree of saturation
b. saturation temperature
c. superheated temperature
d. degree of superheat - CORRECT ANSWER b. saturation temperature
temperature measurement is an indication of the
a. level of heat intensity
b. total heat of a substance
c. rate of heat transfer from one substance to another
d. total heat contained in any closed energy system - CORRECT ANSWER a. level of
heat intensity
which of the following statements listed concerning heat transfer is correct?
a. heat is always transferred at a constant rate
b. heat transfer rate increases as temperature differences increases
c. the rate of heat transfer is not affected by temperature difference
d. the high temperature region is known as a heat sink - CORRECT ANSWER b. heat
transfer rate increases as temperature differences increases
which of the following statements concerning energy is correct?
, a. energy can be created or destroyed
b. energy may not be destroyed
c. the total quantity of energy in the universe is always the same
d. none of the above - CORRECT ANSWER c. the total quantity of energy in the
universe is always the same
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 ____
a. latent contact
b. critical state
c. sensible contact
d. saturated condition - CORRECT ANSWER d. saturated condition
which of the listed methods of heat transfer takes place when two substances of different
temperatures are in physical contact with each other?
a. radiation
b. conduction
c. convection
d. none of the above - CORRECT ANSWER b. conduction
in which of the listed components is chemical energy converted to thermal energy which
regards to boiler operation?
a. furnace
b. superheater
c. steam drum
d. economizer - CORRECT ANSWER a. furnace
