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Q. An antenna has an aperture area of 10 m2 ,an aperture ef?ciency of 0.6, and negligible losses. If it is used at 5 GHz, determine:
(a) Its power gain.
(b) The maximum power density that the antenna can generate at a distance of 20 km with an input power of 2 kW.
Q. Explain, with the help of structure, the working of UJT? List its applications One of the oddest semiconductor devices in use is the unijunction transistor (UJT). As its nam
The Central Processing Unit The central processing unit is the brain of whole PLC. The CPU consist of a microprocessor memory chip and other integrated circuits to con
Rise Time (t r ) During rise time voltage falls from 90% V a to 10% where V a where V a is the initial anode voltage. In terms of current time taken by anode curre
Q. Determine the synchronous speed in revolutions per minute and the useful torque in newton- meters of a 200-hp, 60-Hz, six-pole synchronous motor operating at its rated full load
Q. How does the value of Idss and Vp change with the change in Vgs The value of Vp and and Idss can be controlled by adjusting the value of the gate to sorce voltage ie Vgs. T
Q A beam containing two types of charged particles is moving from A to B. Particles of type I with charge +3q, and those of type II with charge -2q (where -q is the charge of an el
State advantagesof Washing machine Main advantages are that these washing machines are fully automatic (wash programs are fully stored) it makes them easy to use, they are chea
Q. The circuit shown in Figure is the equivalent circuit of a field-effect transistor (FET) amplifier stage. (a) Determine the y-parameters. (b) For values of µ = g m /g d >
Holding current The holding current is the value of on state current required to maintain conduction once the device the device has fully timed on and the gate
Factors which affect the inductance of an inductor include: i) The number of turns of wire (N) - more turns the higher the inductance ii) The cross-sectional area of the
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