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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.
Q. Explain the effect of feedback on amplifier bandwidth? The bandwidth of an amplifier is defined as the range of frequencies for which the gain remains constant.The gain -ban
I would send the project file so you can take a look at it.
how does an RC 3 phase shift oscillator operates?
The voltage across a 1 - μF capacitor is given. Which is the sinusoidal expression for the current? a) 30 sin200t b) 70cos (800t - 20°) At what frequency will the re
Q. Show output Characteristic Of Common Emitter Configuration? Output characteristics: This family of curves may be divided into three regions just as was done for common base
Merits and demerits of? AC and DC onboard ship
Q. Explain the fixed bias circuit? The Fig refers to the common emitter collector characteristics and the ac and dc load lines.The Fig shows the points Q 1 and Q 2
Q The electric ?eld intensity due to a point charge in free space is given to be (-¯ ax -¯ ay +¯ az)/√ 12V/mat (0,0,1) and 6 ¯ az at (2,2,0) Determine the location and the value
A three-phase, 34.5-kV, 60-Hz, 40-km transmission line has a per-phase series impedance of 0.2+j0.5/km. The load at the receiving end absorbs 10 MVA at 33 kV. Calculate the follow
A three stage switching structure is to accommodate N = 128 input and 128 output terminals. For 16 first stage and 16 last stage, verify the number of cross points for nonblocking.
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