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What kind of feedback does this op-amp amplifier use?

The figure depicts the frequency response of a 2nd order low-pass filter. At what frequency is the roll-off slope closest to -40dB/decade?

The peak hold circuit is shown as below: Given that R1=10kΩ , C= 1uF, what is the time constant in ms?

In the circuit pictured below, R1=100Ohm and R2 is the potentiometer shown on the left.   If we want to use the circuit to power a 6V device connected to Vout with a 9V battery connected to Vin, what resistance (in Ohms) should the potentiometer be set to?

Given that R1=3kOHM, R4=6kOHM, R2=5kOHM, R3= 10kOHM, Rf1=20kOHM, Rf2=20kOHM, what would be the value of Vout if Vin1=Vin2=Vin3=1 V?

A first-order passive high pass filter with load resistor circuit is shown as below:   If R= 10kΩ, C=0.01uF, What is the cutoff frequency for this filter in Hz?

The circuit below is a variable gain amplifier. Suppose Rf =1000 Ohm, JFET has the threshold voltage of -0.3V and corresponding resistance shown in the table, what is the maximum and minimum gain for this amplifier as the control voltage is varied from 0 to Vth? DC control voltage of JFET (V) Resistance of JFET (Ohm) 0.0 200 -0.3 infinite

Suppose we apply 3.5V to Node A of the following resistor network, what would be the output voltage at Node B? Express your answer in volts.

For an ideal comparator in the following configuration, what is V_out?

For the given oscilloscope screen, calculate peak-to-peak voltage of the signal (in Volts). Note: volt/div = 2 Volts/div            time/div = 1 ms/div