Engineering, 16.01.2020 22:31 katefuly

Assume that one component with 256 i/os is offered in three forms: qfp, full array pbga, and fl ip chip with gold bumps. the pitch of the qfp is 0.4 mm and the lead length is 1 mm. an edge of the qfp to the center of the nearest lead is assumed to the same as the lead pitch. the pitch of the bga is 1.27mm and an edge to the center of the nearest solder joints is 2.5 mm. the pitch of the flip chip is 0.4 mm and an edge to the center of the nearest solder joints is1mm. assume the underll extension is 1 mm.
1. calculate the pcb surface area requirement for each case.

Answers: 2

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

Answers: 2

Answer

Engineering, 04.07.2019 19:20

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2

Answers: 2

Answer

Engineering, 04.07.2019 19:20

Asimple speed reducer is composed of 2 spur gears. the pinion gear has a pitch diameter of 0.75" and 36 teeth while the driven gear has a pitch diameter of 4.0" and 192 teeth. a)-what is the diametral pitch of each gear? b)-if an electric motor rotating ccw at 3000 rpm is coupled to the pinion, what is the rotational speed of the driven gear? c)-if the torque delivered to the pinion is 1 n-m, what is the torque on the driven gear? d)-what is the power transmitted by the gear train?

Answers: 1

Answer

Engineering, 06.07.2019 03:10

Oxygen at 300 kpa and 400 k is in a closed system with an initial volume of 0.1 m3. is now compressed in a polytropic process, with exponent of n 1.2, to a temperature of 500 k. calculate: a) the boundary work done during the compression, in kj b) the heat transfer during the compression, in kj

Answers: 3

Answer

You know the right answer?

Assume that one component with 256 i/os is offered in three forms: qfp, full array pbga, and fl ip...

Questions