COMMERCIAL BOILERS FINAL EXAM
2025 QUESTIONS AND 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 - ANS 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
1
Page
c. latent heat
@COPYRIGHT SIRJOEL 2025/2026
, d. ambient heat - ANS 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 - ANS 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
2
d. thermal to chemical - ANS a. potential to kinetic
Page
@COPYRIGHT SIRJOEL 2025/2026
, 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 - ANS 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 - ANS a. level of heat intensity
3
which of the following statements listed concerning heat transfer is correct?
Page
@COPYRIGHT SIRJOEL 2025/2026
, 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 - ANS 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 - ANS 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 ____
4
Page
@COPYRIGHT SIRJOEL 2025/2026
2025 QUESTIONS AND 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 - ANS 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
1
Page
c. latent heat
@COPYRIGHT SIRJOEL 2025/2026
, d. ambient heat - ANS 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 - ANS 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
2
d. thermal to chemical - ANS a. potential to kinetic
Page
@COPYRIGHT SIRJOEL 2025/2026
, 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 - ANS 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 - ANS a. level of heat intensity
3
which of the following statements listed concerning heat transfer is correct?
Page
@COPYRIGHT SIRJOEL 2025/2026
, 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 - ANS 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 - ANS 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 ____
4
Page
@COPYRIGHT SIRJOEL 2025/2026
