(a) Design a band-pass filter consisting of an RC high-pass filter with a cutoff frequency of 125 Hz and an RC low-pass filter with a cutoff frequency of 500 Hz. "Carefully select the R and C of each filter so that one filter does not load the other, changing the cutoff frequencies. Make one" of the two resistors equal to 1.5 kΩ. (b) Sketch and label the circuit. (c) Calculate the gain of the band-pass filter at 125 Hz, 250 Hz, and 500 Hz. (d) Comment on your results in c.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Manometers are good examples of measuring instruments, nowadays they are not as common as before. a)-capacitive probe gauges b)-gravitational gauges deformation ) gauges d)-digital gauges

Ifa component is made of two or more materials with different modulus of elasticity (e), it is called a composite member and we calculate the factor·n". mention the formula for calculating n". also, ifn> 1, explain what will happen to the 1. transformed. gi) ifn 1, what will happen to the material when transformed material when