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Q. Illustrate working of Direct-coupled Amplifiers?
Direct-coupled Amplifiers : The following figure shows a direct-coupled amplifier consisting of two stages. A dc voltage is applied directly to the grid of the first stage. The plate output of this first stage is then connected directly to the grid of the second stage. The bias and plate supply voltage (B+) for each succeeding stage must be greater than that of the preceding one. Direct-coupled amplifiers are used in vacuum tube voltmeters and electronic voltage regulators where small dc voltage changes must be amplified.
Suppose that the x rays are emitted from a focal spot isotropically. The photon flux is 3.28 x 10 6 photons mm -2 sec -1 at a distance of 0.75 m from the focal spot. What is the
Q. Explain about Zener Diodes? Most diodes are not intended to be operated in the reverse breakdown region. Diodes designed expressly to operate in the breakdown region are cal
Precautions to be taken in carrying out repairs on HT and LT switch gear? Ans: The following precautions to be taken in carrying out repairs on LT and HT switch gears. a
connect two given points A and B by a parabolic curve when OA=60mm,OB=80mm and angle AOB=110 degree
A 440-V, 60-Hz, six-pole, wye-connected, squirrel-cage induction motor with a full-load speed of 1170 r/min has the following parameters per phase referred to the stator: R 1 = 0.
Q. Explain the three-line cable Residential wiring? The three-line cable coming out of the secondaries of the distribution transformer on the utility pole passes through the el
Q. A current of 65 A is measured with an analog ammeter having a probable error of ±0.5% of full scale of 100 A. Find the maximum probable percentage error in the measurement.
Q. A balanced wye-connected load with a per-phase impedance of 4 + j 3 is supplied by a 173-V, 60-Hz three-phase source. (a) Find the line current, the power factor, the tota
Q. Let the solenoid carry an alternating current of 10 A (rms) at 60 Hz instead of the direct current. Find an expression for the instantaneous force.
Design a logic circuit when to provide an output when any two or three of four switches are closed.
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