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Q. Using the small-signal equivalent circuit of a BJT with gm = 0.03 S, β = 75, and VA = 65 V, a load resistor RL is connected from the collector to the emitter, as shown in Figure. The transistor is biased to have a dc collector current of 6 mA.
(a) CalculatevL due to the small change vBE.
(b) Find the corresponding change iB in the base current.
Q. The N-coil windings of a three-phase, two-pole machine are supplied with currents ia,ib, and ic, which producemmfs given by F a = Ni a cos θm; F b = Ni b cos(θm - 120°); and
what is ebers moll model
Q. Explain the principle of transistor phase shift oscillator? The phase shift oscillator consists of an inverting amplifier stage coupled to a three stage RC filter network. T
Q. Discuss the essentials of an oscillator? The essential components of an oscillator are (i) Tank Circuit: It consists of inductance coil(L) connected in parallel with ca
Q. In an amplifier, the maximum voltage gain is 1500 and occurs at 1kHz. It falls to 1060.5 at 20kHz and at 20Hz. Determine (i) lower cut-off frequency (ii) upper cut-o
Q. Show that any amplifier represented by the model of Figure of the text can also be represented by themore general hybridmodel of Figure. Evaluate the four parameters of the hybr
Q Explain about 'Darlington Amplifier'? DARLINGTON AMPLIFIER : A CC stage followed by another CC stage has an input resistance of about (b + 1) 2 times the emitter resistance
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Ferroelectric materials are characterised by (A) Very high degree of polarisation. (B) A sharp dependence of polarisation on temperature. (C) Non-linear dependence o
Regenerative Braking Control In this methods motor behaves like a generator and the kinetic energy of the motor and connected load is returned to the supply. If means
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