Power Engineering 2A2 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
Define a perfect gas - 🧠ANSWER ✔✔A perfect gas is a gas which is
sufficiently removed from its condensation temperature that it will remain in
its gaseous state when subjected to changes of temperature and pressure
of the operation being considered.
The relationship between temperature, pressure and volume is consistent
throughout a selected working range. The behavior of a perfect gas can be
used as a model for the behavior of real gases.
,What are the units for gas law calculations? - 🧠ANSWER ✔✔The units
must always be in absolute pressure (not gauge pressure) and in degrees
Kelvin.
What is the ideal gas law? - 🧠ANSWER ✔✔The ideal gas law represents
the relationship among pressure, volume and temperature that includes the
mass of the substance.
PV=mRT
Dalton's Law - 🧠ANSWER ✔✔The total pressure of a mixture of gases is
equal to the sum of the individual (or partial) pressures which each gas
would exert if the other gases were not present. In other words, the partial
pressure of each gas is calculated using the total volume, and the total
pressure is the sum of the partial pressures. (Ptotal=P1+P2+P3...)
What is the specific heat of a substance? - 🧠ANSWER ✔✔It is the amount
of heat which is required to raise a unit quantity through 1 Deg C rise in
temperature.
,A solid or a liquid has only one specific heat, where a gas has many,
depending upon the conditions under which the heat supply is given. The
standard cases taken are heat addition at constant volume or constant
pressure.
Why is Cp always greater than Cv? - 🧠ANSWER ✔✔Assuming the same
quantity of gas and the same temperature rise in each case, the heat
quantity supplied at a constant pressure must be greater than that supplied
under constant volume conditions because the in addition to raising the gas
temperature, work must be done on the piston to move it against the
constant pressure.
What type of information is provided by welding symbols? - 🧠ANSWER
✔✔-The type of weld or welds required at the joint
-The exact location of the weld on the joint
-The size of the weld or welds
-The spacing of welds if more than one is used on a joint
-Special procedures or notes with respect to the weld
When it comes to welding, what are the basic joint types? - 🧠ANSWER ✔✔-
Butt
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
, -Lap
-Tee
-Corner
-Edge
When are groove welds used? - 🧠ANSWER ✔✔They are used when the
surfaces being joined are butted against each other in such a way that a
groove is created.
What are some standard groove shapes? - 🧠ANSWER ✔✔-V
-Double V
-Bevel
-Square
-U
-Double U
-J
-Scarf (The joined edges are machined flat but at an angle, common for
brazing)
-Flare-v
Questions and Verified Answers |
Already Graded A+
Define a perfect gas - 🧠ANSWER ✔✔A perfect gas is a gas which is
sufficiently removed from its condensation temperature that it will remain in
its gaseous state when subjected to changes of temperature and pressure
of the operation being considered.
The relationship between temperature, pressure and volume is consistent
throughout a selected working range. The behavior of a perfect gas can be
used as a model for the behavior of real gases.
,What are the units for gas law calculations? - 🧠ANSWER ✔✔The units
must always be in absolute pressure (not gauge pressure) and in degrees
Kelvin.
What is the ideal gas law? - 🧠ANSWER ✔✔The ideal gas law represents
the relationship among pressure, volume and temperature that includes the
mass of the substance.
PV=mRT
Dalton's Law - 🧠ANSWER ✔✔The total pressure of a mixture of gases is
equal to the sum of the individual (or partial) pressures which each gas
would exert if the other gases were not present. In other words, the partial
pressure of each gas is calculated using the total volume, and the total
pressure is the sum of the partial pressures. (Ptotal=P1+P2+P3...)
What is the specific heat of a substance? - 🧠ANSWER ✔✔It is the amount
of heat which is required to raise a unit quantity through 1 Deg C rise in
temperature.
,A solid or a liquid has only one specific heat, where a gas has many,
depending upon the conditions under which the heat supply is given. The
standard cases taken are heat addition at constant volume or constant
pressure.
Why is Cp always greater than Cv? - 🧠ANSWER ✔✔Assuming the same
quantity of gas and the same temperature rise in each case, the heat
quantity supplied at a constant pressure must be greater than that supplied
under constant volume conditions because the in addition to raising the gas
temperature, work must be done on the piston to move it against the
constant pressure.
What type of information is provided by welding symbols? - 🧠ANSWER
✔✔-The type of weld or welds required at the joint
-The exact location of the weld on the joint
-The size of the weld or welds
-The spacing of welds if more than one is used on a joint
-Special procedures or notes with respect to the weld
When it comes to welding, what are the basic joint types? - 🧠ANSWER ✔✔-
Butt
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
, -Lap
-Tee
-Corner
-Edge
When are groove welds used? - 🧠ANSWER ✔✔They are used when the
surfaces being joined are butted against each other in such a way that a
groove is created.
What are some standard groove shapes? - 🧠ANSWER ✔✔-V
-Double V
-Bevel
-Square
-U
-Double U
-J
-Scarf (The joined edges are machined flat but at an angle, common for
brazing)
-Flare-v
