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QUESTION: 1

When does a resistance provide a negative feedback to an amplifier?

Solution:

An op amp is said to have a negative feedback when a resistance is connected between the input and output terminals respectively.

QUESTION: 2

The effect of the inverting configuration is

Solution:

Inverting introduces a phase shift of 180^{o} or it ‘inverts’ a peak.

QUESTION: 3

For an ideal negative feedback configuration which of the following is true?

Solution:

There is always a virtual short circuit in this type of case. There will be a virtual ground if and only if one of the terminals is grounded.

QUESTION: 4

The negative feedback causes

Solution:

Ideally the input terminals are at the same potential but in real practice there is a very small potential between the two terminals.

QUESTION: 5

The non-inverting closed loop configuration features a high resistance. Therefore in many cases unity gain follower called buffer amplifier is often used to

Solution:

Buffer amplifiers are required to connect a high resistance load to a low input resistance output.

QUESTION: 6

The advantage of a weighted summer operational amplifier is

Solution:

All of the mentioned are characteristics of a weighted summer operational amplifier over the traditional amplifier.

QUESTION: 7

The following is a circuit of weighted summer capable of summing coefficients of both sign. The expressions for the output voltage v_{0} is

Solution:

The voltages are increased first by the left side of the portion and then are also magnified by the right side of the circuit. There are four inputs given out of which two are magnified twice and the other are magnified only once.

QUESTION: 8

You are provided with an ideal op amp and three 10kΩ resistors. Using series and parallel resistor combinations, how many different inverting-amplifier circuit topologies are possible?

Solution:

Consider series and parallel combination of the resistances provided and arrange then in the feedback region and as output resistance.

QUESTION: 9

The loop gain for an ideal operational amplifier with R_{1} = 10kΩ and R_{2}(negative feedback) = 1MΩ is

Solution:

Loop gain in this case is given by 20 log (1000000/10000).

QUESTION: 10

In an inverting op-amp circuit for which the gain is −4 V/V and the total resistance used is 100 kΩ. Then the value of R_{1} and R_{2} (negative feedback)

Solution:

Solve R_{1} + R_{2} = 100

R_{2}/R_{1} = 4 for R_{1} and R_{2} respectively.

QUESTION: 11

In the non-inverting configuration of operational amplifier

Solution:

Non inverting configuration requires a power source connected to the power source.

QUESTION: 12

For ideal non-inverting operational amplifier

Solution:

It is an ideal characteristic of the non-inverting op amp.

QUESTION: 13

For an ideal non-inverting operational amplifier having finite gain (A), the ratio of output voltage (v_{0}) to input voltage (v_{i}) is (given R_{2} is the feedback resistance)

Solution:

It is a standard mathematical expression.

QUESTION: 14

The gain for an ideal non-inverting operational amplifier is (given R_{2} is the feedback resistance)

Solution:

It is a standard mathematical expression.

QUESTION: 15

While performing an experiment to determine the gain for an ideal operational amplifier having finite gain, a student mistakenly used the equation 1 + R_{2}/R_{1} where R_{2} is the feedback resistance. What is the percentage error in his result? Given A is the finite voltage gain of the ideal amplifier used.

Solution:

The correct formula is (1+R2/R1)/(1+((1+R2/R1)/A)).

QUESTION: 16

The finite voltage gain of a non-inverting operational amplifier is A and the resistance used is R_{1} and R_{2} in which R_{2} is the feedback resistance. Under what conditions it can one use the expression 1 + R_{2}/R_{1} to determine the gain of the amplifier?

Solution:

The formula is valid for the ideal case in which the value of A is infinite, practically it should be very large when compared to R_{2}/R_{1} .

QUESTION: 17

Which of the following is not true for a voltage follower amplifier?

Solution:

All the statements are false.

QUESTION: 18

For designing a non-inverting amplifier with a gain of 2 at the maximum output voltage of 10 V and the current in the voltage divider is to be 10 μA the resistance required are R_{1} and R_{2}where R_{2} is used to provide negative feedback. Then

Solution:

1 + R2/R_{1} = 2 and 10/(R_{1}+R_{2}) = 10 μA. Solve for R_{1} and R_{2}.

QUESTION: 19

It is required to connect a transducer having an open-circuit voltage of 1 V and a source resistance of 1 MΩ to a load of 1-kΩ resistance. Find the load voltage if the connection is done

Solution:

When a unity gain follower is uses then input signal is equal to output signal. When connected directly, output signal is given by 1 X 1kΩ/1MΩ or 1mV.

QUESTION: 20

Consider the figure given below. If the resistance R1 is disconnected from the ground and connected to a third power source v3, then expression for the value of v0 is

Solution:

When a third power source is connected to the resistance of 1kΩ, then also the potential between the two input terminals of op amps remains the same. Using this fact the expression c is obtained.

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