List of top Physics Questions on Analog Electronics asked in IIT JAM PH

For a Zener diode as shown in the circuit diagram below, the Zener voltage $V_Z$ is 3.7 V. For a load resistance ($R_L$) of 1 k$\Omega$, a current $I_1$ flows through the load. If $R_L$ is decreased to 500 $\Omega$, the current changes to $I_2$. The ratio $\frac{I_2}{I_1}$ is \rule{1cm{0.15mm}. (up to two decimal places)}

A NPN bipolar junction transistor (BJT) is connected in common emitter (CE) configuration as shown in the circuit diagram below. The amplifier is operating in the saturation regime. The collector-emitter saturation voltage ($V_{CE,sat}$) is 0.2 V. The current gain $\beta = 100$. The maximum value of base resistance $R_{BB}$ is \rule{1cm{0.15mm} k$\Omega$. (in integer)}

In the circuit given below, the frequency of the input voltage $V_{IN}$ is $\omega = 10^4$ rad/s. The output voltage $V_{AB}$ leads $V_{IN}$ by

If the input voltage waveform $V_{IN}$ is a ramp function (as shown in the $V_{IN} - t$ plot below), then the output wave form ($V_{OUT}$) for the given circuit diagram having an ideal operational amplifier (Op-Amp) is

For the AC circuit shown in the figure, $R = 100\, \text{k}\Omega$ and $C = 10\, \text{pF}$, the phase difference between $V_{in}$ and $V_{out}$ is $90^\circ$ at the input signal frequency of ............. kHz. (Round off to 2 decimal places)

In the circuit shown in the figure, both OPAMPs are ideal. The output for the circuit $V_{out}$ is:

Which one of the following graphs shows the correct variation of $v_o$ with $v_i$? Here, $v_d$ is the voltage drop across the diode and the Op-Amp is assumed to be ideal.

For the following circuit, the collector voltage with respect to ground will be .............. V. (Emitter diode voltage is 0.7 V and $\beta_{DC}$ of the transistor is large.) (Specify your answer in volts up to one digit after the decimal point.)

For the given circuit, the value of base current $I_b$ of the npn transistor is ........... mA. ($\beta$ is the current gain and assume the Op-Amp as ideal.) (Specify your answer in mA up to two digits after decimal.)

In the following circuit, $RC$ is much larger than the input period. Assume diode is ideal and $R$ is large. The dc output voltage across $R$ will be .............. V. (Specify answer up to one digit after the decimal point.)