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

Assuming base-emitter voltage of $0.7\text{ V}$ and $\beta =99$ of transistor $Q_1$, the output voltage $V_o$ in the ideal opamp circuit shown below is

Assuming zener diode $D_1$ has current-voltage characteristics as shown below on the right and forward voltage drop of diode $D_2$ is $0.7\text{ V}$, the voltage $V_o$ in the circuit shown below is

The transfer characteristics of the circuit drawn below is observed on an oscilloscope used in XY mode. The display on the oscilloscope is shown on the right hand side. $V_i$ is connected to the X input with a setting of $0.5\text{ V/div}$, and $V_o$ is connected to the Y input with a setting of $2\text{ V/div}$. The beam is positioned at the origin when $V_i$ is zero.



Assuming that the opamp is ideal and the zener diodes have forward biased voltage drop of $0.7\text{ V}$, the values of reverse break-down voltages of $Z_1$ and $Z_2$ are, respectively,

Power in a three phase star connected balanced inductive load is measured by two wattmeter method. The phase voltage and phase current are $230\text{ V}$ and $5\text{ A}$, respectively. The power factor of the load is $0.707$. The readings $P_1$ and $P_2$ of the two wattmeters are

In the Wheatstone bridge shown below, when the resistance $R_1$ increases by $1\Omega$, the current through the galvanometer is



(consider the Thevenin equivalent resistance of the bridge in the calculations)