ANSWERS: ADICA Important Model Questions Mid-1

                                                                                                 Unit-I:

Short Answer Questions:

1. Explain the term input bias current with the help of circuit diagram.

2. Explain the term input offset voltage with the help of circuit diagram.

3. Draw the IC 741 op-amp pin diagram.

4. List two key differences between an ideal op-amp and a practical 741 op-amp.

5. What is the voltage gain of an inverting amplifier if R₁ = 1kΩ and RF = 10kΩ?

6. What is the voltage gain of a non-inverting amplifier if R₁ = 1kΩ and RF = 10kΩ

Essay Type Questions:

1. Draw the IC 741 op-amp pin diagram and explain the function of each pin in detail.

2. Using three op-amps draw the circuit diagram of instrumentation amplifier and derive an expression for the output voltage?

3. Sketch the op-amp practical integrator circuit and explain the working principal in detail.

4. Explain the operation of practical differentiator. Use relevant expressions and diagrams.

5. Draw and explain non-inverting comparator and its input and output wave forms i) Vref is Positive ii) Vref is Negative

6. With neat circuit diagram, explain the working of Schmitt trigger using op-amp.

 

Unit-2:

Short Answer Questions:

1. What is the primary function of an active filter compared to a passive filter?

2. How does a 1st-order Butterworth Low-Pass Filter (LPF) differ from a High-Pass Filter (HPF) in terms of frequency response?

3. Draw the basic functional block diagram of the IC 555 timer.

4. What is the key difference between monostable and astable modes in IC 555?

5. How does the IC 555 produce a square wave in astable mode?

6. Draw the frequency response of Band pass filter

Essay Type Questions:

1. Design a LPF at a cut-off frequency of 1kHz with a passband gain of 2. And plot the frequency response.

2. Design a high pass filter at a cut-off frequency of 1kHz with a passband gain of 2. And plot the frequency response.

3. Draw the circuit for first-order low pass Butterworth filter and derive the expression for cut-off frequencies.

4. Draw the circuit for first-order high pass Butterworth filter and derive the expression for cut-off frequencies.

5. Explain Astable multivibrator circuit using 555 and its working with the help of waveforms. Also derive expression for time period.

6. Draw the 555 monostable multivibrator circuit and explain its working with the help of waveforms. Also derive expression for time period.

 

Unit-3:

Short Answer Questions:

1. What is the main drawback of a Weighted Resistor DAC?

2. Define "Resolution" in the context of a DAC or ADC.

3. An 8-bit DAC has a full-scale output voltage of 5.0 V. What is its resolution in millivolts (mV)?

Essay Type Questions:

1. Draw the block diagram of inverted R-2R ladder DAC and explain its operation in detail.

2. Draw the block diagram of R-2R ladder DAC and explain its operation in detail.

3. Draw the circuit of a Weighted Resister DAC and obtain expression for n-bits.

4. Draw the block diagram of R-2R ladder DAC for the binary word 001 and derive the expression for output voltage (Vo).