GATE EC question library

The oscillator circuit shown in the figure,

The transistor shunt regulator shown in the figure is has a regulated output voltage of $10 \mathrm{~V}$, when the input varies from $20 \mathrm{~V}$ to $30 \mathrm{~V}$. The relevant parameters for the zener diode and the transistor are: $\mathrm{V}_{\text{Z}}=9.5, \mathrm{~V}_{\text{SE }}=0.3 \mathrm{~V}, \beta=99$. Neglect the current through …

An npn $\text{BJT}$ has $\mathrm{gm}=38 \mathrm{~m} \mathrm{~A} / \mathrm{V}, \mathrm{C}_{u}=10^{-14} \mathrm{~F}$, $C_{\pi}=4 \times 10^{-13} \mathrm{~F}$, and $D C$ current gain $\beta_{0}=90$. For this transistor $f_{\mathrm{T}}$ and $f_{\beta}$ are

The $Z$ parameters $Z_{11}$ and $Z_{21}$ for the $2$-port network in the figure,

In the figure, the value of the load resistor $R$ which maximizes the power delivered to it is

This question consists of TWENTY FIVE subquestions $(2.1-2.25)$ of TWO marks each. For each of these sub-questions, four possible answers ( $\text{A, B, C}$ and $\text{D}$) are given, out of which only one is correct. Answer each sub-question by darkening the appropriate bubble on the OBJECTIVE RESPONSE SHEET (ORS) using a soft HB pencil. Do not use …