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A printed circuit board (PCB) is cooled by laminar, fully developed air flow in adjoining, parallel-plate channels of length L and separation distance a. The channels may be assumed to be of infinite extent in the transverse direction. and the upper and lower surfaces are insulated. The temperature T, of the PCB board is uniform, and air flow with an inlet temperature of Tm,i is driven by a pressure difference, ?p.
Calculate the average heat removal rate per unit area (W/m2) from the PCB.
a boost converter operates at 20 khz, and converts power from a solar panel to a battery bus. the panel has norminal volate of 16v and current up to 3 A. the battery bus is 48 v. the transistor can be modelled as a 0.5 v constant forward drop.
The 24-bit data field of a packet is given by 0xBC603F. The packet contains a CRC with the generator polynomial given by X 3+X+1 a) Find the CRC checksum. Provide the complete code-word including the checksum in hex.
A process worker received an electric shock when she attempted to turn off a conveyer control. The toggle switch controlled the power to a variable speed drive. An examination found that dust had accumulated on the toggle switch. Moisture on the ..
A point charge Q1 lies at the center of a spherical conducting shell of inner radius a and outer raduis b. find the charge density on the two surfaces of the conduting shell if it has a net chargeQ2
the saturated liquid and vapor mixture at t=300c and quality of 75%.the mixture occupies a volume of 0.05 m^3 (a) find the specific volume in m^3/kg (hints: vf= 0.0014 vg=0.02167m^3/kg at t =300c) (b) find the mass of the mixture in kg.
The first parallel combination is composed of a 6 ohm resistor and a 3 ohm resistor.the second parallel combination is composed of a 12 ohm resistorand a 6 ohm resistor. Draw the network and determine its equivalent resistance.
How much work is required to move a charge of 0.02 microcoulombs from one point to another if the potential difference between the points is 6.3 volts
Sketch the phasor diagrams for the following waveforms: v1 = 80sin(pi*t + 35°)(a) What is the phase difference between v1 and v2 (b) Determine which voltage leads and which lags.
A uniform magnetic field is applied perpendicular to the plane of a 60-turn circular coil with a radius of 6.0 cm and a resistance of 0.60 ohms. If the magnetic field increases uniformly from 0.20 T to 1.8 T in 0.20 s
show that the most probable electron energy in the conduction band of a semiconductor is kt2 above the bottom of the
When disconnected and fully charged, the voltage across the battery terminals is measured to be 13.8 V. When connected to a load that dissipates 18 W of power, the terminal voltage of the battery decreases to 12 V.
In each of the following sets, the function have been minimized individually. Find a minimum two-level circuit (cooresponding to SOP expression) using AND and one OR gate per function for each. F = B'D' + CD' + AB'CG = BC + ACD ( 6 gates, 15 inputs..
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