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A power transistor for which Tjmax=180degrees Celsius can dissipate 50Watts at a case temperature of 50degrees. If it is connected to a heat sink using an insulating washer for which the thermal resistance is .6degrees Celsius/Watt, what heat sink temperature is necessary to ensure safe operation at 30Watts? For an ambient temperature of 39degrees Celsius, what heat sink thermal resistance is required? If for a particular extruded aluminum finned heat sink, the thermal resistance in still are is 4.5degrees Celsius/Watt per centimeter of length, how long a heat sink is needed?
The current through a branch in a linear network is 2 A when the input source is 10 V. If the voltage is reduced to 1 V and the polarity is reversed, the current through the branch is a. - 2 A b. - 0.2 A c. 0.2 A
Lithium chloride crystallizes in a face-centered cubic structure. The unit cell length is 5.14 10-8 cm. The chloride ions are touching each other along the face diagonal of the unit cell. The lithium ions fit into the holes between the chloride io..
(a) Calculate the velocity of the holes and electrons in this material. (b) What doping level is necessary to provide a current density of 2 mA/micrometer^2 under these conditions? Assume the hole current is negligible.
Assume that life on Mars requires cell potential to be +100mV, and the extracellular concentrations of the three major species are following (mmol/L): Na+ : 145; K+ : 4; Cl- : 120. Choose one species and assume that other two permeabilities are ze..
Estimate the propagation delays of implementations (1), (2) and (3) using typical propagation delay data in the timing specifications of the logical gates of CD4000 family. Take the average propagation delay for 1-0 and 0-1 output transitions.
The system contains a door sensor, a window sensor, and a key activation switch. If the switch is on, opening the window will set off the alarm immediately. Opening the door will start a 30 second timer.
Design a combinational logic circuit that compare two 2- bit number. The circuit must have three outputs indicationg if the two numbers are equal, first larger than the second, or the second is larger than the first.
A 50HP single phase motor operates from a 480V, 60HZ supply. When delivering full rated power the motor efficiency is 89% and the power factor is 0.78 lagging. Determine the full load current.(Hint: 746W=1HP)
Power Factor, A single phase electric motor has an output power of 10 kW and an efficiency of 90% at full load. The motor is fed from a 240 V supply via a cable that has a resistance of 10 milli ohms per metre length.
A trough is 8 feet long and 1 foot high. The vertical cross-section of the trough parallel to an end is shaped like the graph of y=x^{8} from x=-1 to x=1 . The trough is full of water. Find the amount of work in foot-pounds required to empty
Methods used to eliminate noise from a spatio-temporal signal, Name and describe, in detail, 2 methods used to eliminate noise from a (spatio-temporal) signal. This question requires a clear, detailed explanation of the methods. Mathematical equation..
A window is etched through a 500 nm thick oxide on a [100] silicon wafer. The wafer is re-oxidized at 1100 °C using wet oxidation to grow a 750 nm thick film inside the window. Draw a cross-section of the wafer following the second oxidation.
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