Aspacer made of sae 1020 hot-rolled steel is in the form of a hollow cylinder with a nominal inside diameter of 3.2500 in and an outside diameter of 4.000 in. it is to be mounted on a solid steel shaft with a heavy force fit. specify the dimensions for the shaft and sleeve, and compute the stresses in the sleeve and shaft after installation at maximum interference. also determine the deformation of the sleeve and shaft. use the basic hole system. the modulus of elasticity of steel, e = 30 × 106 psi and poisson’s ratio, = 0.29.

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?

Which of the following components of a pid controlled accumulates the error over time and responds to system error after the error has been accumulated? a)- proportional b)- derivative c)- integral d)- on/off.

Acertain flow of air (at stp) has a velocity distribution given by v i (in ft/s). if this flow is going through a 4 ft square area in the yz-plane (centered at the origin), what is the mass flow rate (in lbm/s)?