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Define and explain Numerical aperture?
Figure shown below shows an incident ray to the fibre,
The light bends at two interfaces, one at the air- core interface and the other is the core cladding interface.At the first interface, we can writen sin O0 = n1 sin O ---------(1)but minimum value of Ø is Øc where Ømax = 90 - Øc, then (1) becomes n sin Omax = n1 sin Ømax = n1 sin (90 - Øc)n sin Omax = n1 cos Øc.............(2)at the second interface, we can writen1 sin Oc = n2 sin 90sin Oc = n2/n1 ........(3)therefore cos Oc = (1- sin2 Oc)1/2 cos Oc = [1- (n1/n2)2]1/2(2) becomes n sin Omax = (n12 - n22)1/2 this is called numerical aperture (NA) of the fibre.NA = (n12 - n22)1/2
Q. Draw the common source drain and transfer characteristics of a JFET. How are they useful? The graph below shows variation of the drain current Id as a function of the drain
A 200-V dc shunt motor has a field resistance of 200 and an armature resistance of 0.5 . On no load, the machine operates with full field flux at a speed of 1000 r/min with an a
Q. Show the familiar electric sources? Batteries and ac outlets are the familiar electric sources. These are voltage sources.An ideal voltage source is one whose terminal volta
reading type of cro probe
Draw the hysteresis loop for a soft magnetic material and compare it with the hysteresis loop of hard magnetic material. Give two examples of each. Soft and hard magnetic mate
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Q. For a transistor, when v GS = -2.0 V, find V DSsat if Vp= -4.0 V for an n-channel depletion mode MOSFET. Solution: V p = -(V DSsat + v SG ) but v SG = -v GS = -(-
Q. Explain Working of Liquid-crystal display? This display needs only microwatts of power (over a thousand times less than a LED) and is used in such devices as electronic wris
how does the kb come across the sheet charge in the amperian sheet?
Q. Counters are used to realize various dividers in the schematic representation of the digital clock shown in Figure. The blocks labeled "logic array" are logic gate combinations
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