A gas metal arc welder is also known as a _____ welder. A) TIGB) GTAWC) GMAWD) Resistance spot
1 answer:
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Answer:
a) Irreversible, b) Reversible, c) Irreversible, d) Impossible.
Explanation:
Maximum theoretical efficiency for a power cycle (), no unit, is modelled after the Carnot Cycle, which represents a reversible thermodynamic process:
(1)
Where:
- Temperature of the cold reservoir, in Kelvin.
- Temperature of the hot reservoir, in Kelvin.
The maximum theoretical efficiency associated with this power cycle is: (,
)
In exchange, real efficiency for a power cycle (), no unit, is defined by this expression:
(2)
Where:
- Heat released to cold reservoir, in kilojoules.
- Heat gained from hot reservoir, in kilojoules.
- Power generated within power cycle, in kilojoules.
A power cycle operates irreversibly for , reversibily for
and it is impossible for
.
Now we proceed to solve for each case:
a) ,
Since , the power cycle operates irreversibly.
b) ,
Since , the power cycle operates reversibly.
c) ,
Since , the power cycle operates irreversibly.
d) Since , the power cycle is impossible.