This set of Electric Circuits test focuses on “Operational Amplifier Terminals,Terminal Voltages and Currents”.
1. Op-amp was introduced by __________
Explanation: Op-amp was introduced by Fairchild semiconductor in 1968.
2. The number of terminals in an Op-amp ______________
Explanation: Inverting input, the Non-inverting input, Output, Positive power supply, Negative power supply.
3. The Op-amp is a type of ___________
a) Differential amplifier
b) Integrated amplifier
c) Isolation amplifier
d) Feedback amplifier
Explanation: The Op-amp is a type of differential amplifier.
Explanation: V+: Non-inverting input and V- : Inverting input.
5. When the input voltage difference is small in magnitude, the Op-amp behaves as ____________
a) Non-linear device
b) Linear device
c) Complex device
d) Bipolar device
Explanation: When │vp-vn│is small then Op-amp acts as a linear device as the output voltage is a linear function of input voltages.
6. If the output voltage is not a linear function of input voltage then ____________
a) Op-amp acts a linear device
b) Op-amp acts as a non-linear device
c) Op-amp acts a polar device
d) Op-amp acts as an inverter
Explanation: If output voltage is not a linear function of input voltage then Op-amp acts as a non-linear device.
7. The negative feedback causes the input voltage difference to ____________
Explanation: Negative feedback means a signal is fed back from output terminals to the non-inverting input terminals and this results in a decrease in input voltage difference.
Explanation: In this circuit, the only node is at the negative terminal of the Op-amp (say Vn) and by ideal rules of Op-amp, Vn= Vp =0(in this circuit). Gain= Vout/Vin= -R2/R1.
Explanation: Gain= Vout/Vin= -R2/R1 = -5.98*10-3/4.3*10-3.
Explanation: In the given circuit, a negative feedback exists between Op-amp’s output and its inverting input (voltage here is 0, as vp =vb=0 and vn=vp). Node-voltage equation is i50=i125=i0.
i50= (va-vn)/50 =1/50 mA.
I125= (v0-vn)/125 = v0/125 mA.
1/50 + v0/125 = 0.
v0 is -2.5volts.
Sanfoundry Global Education & Learning Series – Electric Circuits.
To practice all areas of Electric Circuits for tests, here is complete set of 1000+ Multiple Choice Questions and Answers.