List of top Physics Questions on Analog Electronics

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.)