81. The 'h' parameter equivalent circuit of a junction transistor is valid for
82. For feedback amplifier with gain $$\frac{{\text{A}}}{{1 - {\text{T}}}}$$ feedback reduces the internally generated noise by a factor
83. A BJT has Ce = 1 pF. If gm is 50 mA/V, calculate the fT of a common-emitter amplifier.
84. The current of a certain Si-diode, when measured with a large reverse bias is found to be 10nA. What would be the current be if a forward bias of 2 V is applied? Assume that T = 300° K, η = 2.
85. What is the output voltage across the 900 ohm load in the circuit given below?
86. The effect of dc saturation in a rectifier transformer is
87. The figure shown is a circuit of which one of the following?
88. Find output voltage Vo in the circuit below:
89. In the circuit shown, it is required that V0 = Vi the values of $$l$$, m, n are respectively. (x represents don't care condition)
90. In the circuit shown below, for the MOS transistors, µn Cox = 100 µA/V2 and the
threshold voltage VT = 1 V. The voltage Vx at the source of the upper transistor is
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