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Q. Write a short note on heat sink
For transistors handling small signals ,the power dissipated at the collector is small.Such transistors have little chances of thermal runaway .However in power transistors ,the power dissipated at the collector junction is larger .This may cause the junction temperature to rise to a dangerous level .We can increase the power handling capacity of a transistor if we make a suitable provision for rapid conduction of heat away from the junction .This can be achieved by using a sheet of metal called heat sink.As the power dissipated within a transistor is predominantly the power dissipated at its collector base junction ,sometimes the collector of the power transistor is connected to its metallic base The case of the transistor is then bolted on to a sheet of metal .The sheet serves a heat sink. Connecting heat sink to a transistor increases the area from which heat is to be transferred to the atmosphere .Heat moves from the transistor to the heat sink by conduction ,and the it is removed from sink to the ambient by convection and radiation.
In a certain chemical-processing plant, a liquid chemical is used in a manufacturing process. The chemical is stored in three different tanks. A level sensor in each tank produces
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In most real signal processing applications the measured signals can not be described by an analytical expression. In addition, by the Wold decomposition theorem a stationary signa
how does the kb come across the sheet charge in the amperian sheet?
I want to make project plz help me n gove me idea about actually its my first year in electrical engineering thts why Ineed help hpfully you will reply soon
find current across r3 with two voltage as sources
hi I need information of Compressor Shaft Impellers Coupling Hub Thrust Collars Balance Drum for centrifugal compressor with pecture
2. A 6 pole lap-wound armature having 720 conductors, rotates in a field of 20.35 mWb. (a) If the induced current is 72 A, what is the torque developed by armature? (b) If the indu
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