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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.
a short review article on the classification of time frame
Customer Indexing Scheme: Customer indexing has to be carried out in a way, that makes it probable to associate the customer's geographical and electrical address along with h
Based on Figure, using star-delta transformation, calculate the current flow and voltage drops at 6kΩ resistor.
Most ac generators used in Power Stations are of the " Flux Cutting " types. Their effiencies range from less than 33% to slightly more than 60%. In their efficiency equations, the
Q. Analog communication systems? An analog message is a continuum of possible amplitudes at any given time, and analog signals are continuous in time and in amplitude, such as
Ratiometer type frequency meter
Registers Various registers shown in figure are discussed below in detail.
what are the grond clearance for 220KV overhead transmission lines?
(a) Design a passive high pass filter that has a maximally flat response with a 50 Ω resistive load. Assume that the cut-off frequency is 40 kHz and that at a frequency of 25 kHz,
a) Write a program that will read and show the analog voltage on pin PE7 approximately once every second. b) Write a program that will read and show in decivolts the analog volt
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