Answer:
Yes, Otto cycle is more efficient than a Diesel cycle with the same compression ratio.
Explanation:
An ideal Otto cycle models the behavior of an explosion engine. This cycle consists of six steps, as indicated in the figure. Prove that the performance of this cycle is given by the expression:
otto performance= 1 - ( 1/(r^(б-1) ) )
r = compression ratio equal to the ratio between the volume at the beginning of the compression cycle and at the end of it.
б=1.4 exponent
A diesel engine can be modeled with the ideal cycle consisting of six reversible steps, as indicated in the figure. Prove that the performance of this cycle is given by the expression:
diesel performance= 1 - ( 1/(r^(б-1) ) ) × ( (r^б)-1 )/(б×(r-1)) )
The ideal Diesel cycle is distinguished from the ideal Otto in the combustion phase, which in the Otto cycle is assumed at constant volume and in the Diesel at constant pressure. Therefore the performance is different.
We see that the efficiency of a Diesel cycle differs from that of an Otto cycle by the factor in parentheses. This factor is always greater than the unit, therefore, for the same compression reasons r diesel performance is less than ottoperformance.
Answer: 4I
Explanation:
If we had simply put in parallel with the wire one equal to it, the total current flowing through both resistors would double, due to the equivalent resistance of two resistors of equal value, in parallel, is just the half of one of them, so applying Ohm's Law, I will be double than I₀.
But in this case, everything happens as if we put in parallel two resistors of half the value (as the resistance is directly proportional to the length while Ohm's Law be valid), so the equivalent resistance becomes 1/4 of the original wire.
Applying Ohm's Law, we have I = (V / R/4) ⇒ I = 4 I₀
Answer:
true
Explanation:
shear strain is define as the ratio of change in deformation to the original length perpendicular to the axes of member due to shear stress.
ε = deformation/original length
strain is a unit less quantity but shear stain is generally expressed in radians but it can also be expressed in degree.