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An octave is defined as a doubling of the frequency. The claim is made that a low-pass Butterworth filter of order n has a roll-off (attenuation) of 6n dB/octave. Calculate the gain in dB for a second-order filter for the cut-off frequency itself, and for three octaves above the cut-off frequency, i.e., for f/f cut off = 1, 2, 4, and 8. Then determine the roll-off in dB per octave. Does the calculated roll-off agree with the stated value of 6n dB/octave? Is the agreement better for low frequencies or high frequencies? Repeat for filters of order 4 and 6.
at the beginning of the compression process of an air-standard otto cycle p1 14.7 lbin2 and t1 530degr. the maximum
air is compressed by a 30-kw compressor from p1 to p2. the air temperature is maintained constant at 25 degrees c
a 30 cm 1 beam with flanges and with a web 1.25cm thick is subjected to a torque 4900nm find the maximum shear stress
in measuring the strains applied to a symmetrical i beam a full bridge is used. two strain gages are attached to the
the top surface of an l 5-mm-thick anodized aluminum plate is irradiated with g 1000 wm2 while being simultaneously
determine the force exerted by each cylinder in raising the crate for u = 60°, a 5 0.70 m, and L = 3.20 m. Show that the result obtained is independent of the distance d.
a water jet pump has a jet area of a0 and jet speec v0. the jet is within a secondary stream of water having speed
a cylindrical pressure vessel with outside diameter 8 inches and thickness frac14 inch is expected to hold pressures of
a pressure transducer behaves as a second-order system. if the undamped natural frequency is 10 khz and the damping is
Carbon fibre reinforced polymers (CFRP have been used extensively in aerospace applications due to their excellent strength to weight and stiffness to weight properties.
design 2-shell pass and 8-tube pass heat exchanger for heating ethyl alcohol from 25degc to 70degc at a rate of 2.9
a 5 kw pump operating at steady state receives liquid water at 100 kpa 15 c and delivers it to a point 6 m above the
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