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A power transistor is specified to have a maximum junction temperature of 150C. When the device is operated at this junction temperature with a heat sink, the case temperature is found to be 97°C. The case is attached to the heat sink with a bond having a thermal resistance θCS =0.5°C/W and the thermal resistance of the heat sink θSA =0.1°C/W. If the ambient temperature is 25°C, what is the power being dissipated in the device? What is the thermal resistance of the device, θJC , from junction to case?
A bus is parked along the side of a highway when it is passed by a truck traveling at a constant speed of 70 km/h. Two minutes later, the bus starts and accelerates until it
Manage work activities to achieve organisational objectives - Identify and explain engineering business functions and explain the inter-relationships between the different pro
The subgrade CBR is 8, the overall standard deviation is 0.45, the initial PSI is 4.2, and the final PSI is 2.5. What is the probability that this pavement will have a PSI a
the air quantities at each surface entry into the mine; the calculations for air quantity exhausting from the fan(s), the expected air pressure, air power and motor kilowatts
Consider the circuit in Fig. 13.1 with the device geometries shown at the top of this page. Let IREF = 40 μA, / Vt / for all devices=0.45 V, μnCox = 270 μA/V2, μpCox = 70 μA
Compute the reduced stiffness [Q] and compliance [S] matrices, and the intralaminar shear stiffness [Q∗ ] and compliance [S ∗ ] matrices for a lamina with E1 = 35 GP a, E2 =
The length ratio is %m (but note that the flow is two dimensional and the direction along the crest is not scaled). What is the model discharge required for dynamic similitu
Calculate the current (I) that it will draw and the resistance (R) of the heating elements. If for some reason the resistance suddenly falls to 2 Ω during use, what would be
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