GATE IN 2011 Question Paper (13-Feb-2011) (Shift-2)

The amplifier shown below has a voltage gain of -2.5, an input resistance of $10k\Omega$ and a lower 3-dB cut-off frequency of 20 Hz. Which one of the following statements is TRUE when the emitter resistance $R_E$ is doubled?

Figure below shows a circuit for implementing an 8-bit Digital-to-Analog converter (DAC) using two identical 4-bit DACs with equal reference voltages. Assume that $b_0$ represents LSB, $b_7$ MSB and the opamp is ideal. To obtain correct analog values corresponding to an 8-bit DAC at the output $V_o$, the value of resistor R is

In the circuit shown below, the switch, initially at position 1 for a long time, is changed to position 2 at $t=0$. $t=0$



The current $i$ through the inductor for $t\ge 0$ is

The current I shown in the circuit given below is equal to

The signal flow graph of a system is given below. R



The transfer function (C/R) of the system is