Electronic components are often mounted with good heat conduction paths to a finned aluminum base plate, which is exposed to a s
1 answer:
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Answer:
It will be equivalent to 338.95 N-m
Explanation:
We have to convert 250 lb-ft to N-m
We know that 1 lb = 4.45 N
So foe converting from lb to N we have to multiply with 4.45
So 250 lb = 250×4.45 =125 N
And we know that 1 feet = 0.3048 meter
Now we have to convert 250 lb-ft to N-m
So
So 250 lb-ft = 338.95 N-m
Answer:
a
The rate of work developed is
b
The rate of entropy produced within the turbine is
Explanation:
From the question we are told
The rate at which heat is transferred is
the negative sign because the heat is transferred from the turbine
The specific heat capacity of air is
The inlet temperature is
The outlet temperature is
The pressure at the inlet of the turbine is
The pressure at the exist of the turbine is
The temperature at outer surface is
The individual gas constant of air R with a constant value
The general equation for the turbine operating at steady state is \
h is the enthalpy of the turbine and it is mathematically represented as
The above equation becomes
Where is the heat transfer from the turbine
is the work output from the turbine
is the mass flow rate of air
is the rate of work developed
Substituting values
The general balance equation for an entropy rate is represented mathematically as
=>
generally
substituting for
Where is the rate of entropy produced within the turbine
substituting values