Question 1

In the ____ circuit, the output voltage is opposite in polarity to the input voltage.&#10;A) rectifying bridge&#10;B) inverting amplifier&#10;C) voltage follower&#10;D) noninverting amplifier

Accepted Answer

In an inverting amplifier circuit, the output voltage is indeed opposite in polarity to the input voltage, meaning if the input is positive, the output will be negative, and vice versa. This is a fundamental characteristic of inverting amplifiers, which use operational amplifiers (op-amps) in their configuration to achieve this inversion.

Question 2

The open loop gain of the 741 operational amplifier is about 100,000.

Accepted Answer

The open loop gain of the 741 operational amplifier is typically around 200,000, not 100,000.

Question 3

As a rule, the 741 operational amplifier is not operated below a gain of 100.

Accepted Answer

The 741 operational amplifier can be operated at gains lower than 100; its minimum stable gain for closed-loop operation is typically around 1 for non-inverting configurations and 2 for inverting configurations, depending on the specific application and configuration.

Question 4

The input impedance value of FETs can be several thousand ____.&#10;A) kilohms&#10;B) megawatts&#10;C) megohms&#10;D) kilovolts

Accepted Answer

The input impedance value of Field-Effect Transistors (FETs) can be several thousand megohms, which is a measure of resistance indicating a very high level of resistance to the flow of electrical current at the input.

Question 5

In the ____ circuit, the output voltage is the same polarity as the input voltage.&#10;A) rectifying bridge&#10;B) inverting amplifier&#10;C) voltage follower&#10;D) noninverting amplifier

Accepted Answer

The answer of In the ____ circuit, the output voltage...

Question 6

Op amps differ, depending on the circuit that it is intended to operate.

Accepted Answer

Op amps (Operational Amplifiers) are designed with different specifications and characteristics (such as bandwidth, slew rate, input impedance, and voltage offset) to suit various applications and circuits, ranging from audio amplification to signal filtering.

Question 7

In the 741 op amp. pin #2 is the ____ input.&#10;A) diverting&#10;B) inverting&#10;C) restricting&#10;D) polling

Accepted Answer

In the 741 operational amplifier (op-amp), pin #2 is designated as the inverting input. This is where the input signal is applied that will be inverted (phase-shifted by 180 degrees) by the op-amp.

Question 8

In the inverting amplifier circuit, the output of the op amp is connected directly back to the inverting&#160; input.

Accepted Answer

In an inverting amplifier circuit, the output of the op-amp is connected back to the inverting input through a feedback resistor, not directly.

Question 9

Some op amps use bipolar transistors and others use field effect transistors (FETs) for the input.

Accepted Answer

Op amps can be designed with either bipolar transistors or field-effect transistors (FETs) at their input stage, depending on the desired characteristics such as input impedance and noise performance.

Question 10

FETs have extremely high ____.&#10;A) input impedance&#10;B) output current&#10;C) input resistance&#10;D) output voltage

Accepted Answer

FETs (Field Effect Transistors) have extremely high input impedance, which is one of their key characteristics.

Deck 38: The Operational Amplifier