While performing an experiment to determine the gain for an ideal operational amplifier having finite gain, a student mistakenly used the equation 1 + R2/R1 where R2 is the feedback resistance. What is the percentage error in his result? Given A is the finite voltage gain of the ideal amplifier used.

Study the following information to answer the questions given below: A company visited an Engineering college for placement drive where students of any branch can participate in the drive. But company put some eligibility criteria. 1) Student having no backlogs are eligible to participate in the drive. 2) Student having greater than 9.8 CGPA without any backlogs are eligible for direct interview round. 3) Student must have at least 70 percentage in 10th and 12th. If the 1st and 2nd criteria not fulfilled then, a) If student has 1 or 2 backlog and the result is awaiting but having a CGPA 8.5 then he has to participate in presentation round before the interview round. Sameer a Mechanical student is the topper of the college having 90 percentage in both 10th and 12th. But he is having a 1 backlog in his 4th semester and the result is awaiting. His CGPA is 8.8.

A

Not eligible to sit in placement drive

B

Have to give presentation before interview round.

C

Eligible for direct interview round

D

Can’t say

The finite voltage gain of a non-inverting operational amplifier is A and the resistance used is R1 and R2 in which R2 is the feedback resistance. Under what conditions it can one use the expression 1 + R2/R1 to determine the gain of the amplifier?

A

A ~ R2/R1

B

A >> R2/R1

C

A << R2/R1

D

None of the mentioned

An amplifier without feedback has a voltage gain of 50, input resistance of 1 kΩ & Output resistance of 2.5 kΩ.The input resistance of the current shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is

A

$$\frac{1}{{11}}{\text{k}}\Omega $$

B

$$\frac{1}{5}{\text{k}}\Omega $$

C

5 kΩ

D

11 kΩ

For an ideal non-inverting operational amplifier having finite gain (A), the ratio of output voltage (v0) to input voltage (vi) is (given R2 is the feedback resistance)

A

(1+R2/R1)/(1+((1+R2/R1)/A))

B

(R2/R1)/(((1+R2/R1)/A))

C

(1+R2/R1)/(((1+R2/R1)/A))

D

(R2/R1)/(1+((1+R2/R1)/A))

For an ideal operational amplifier (except for the fact that it has finite gain) one set of the value for the input voltages (v2 is the positive terminal v1 is the negative terminal) and output voltage (v0) as determined experimentally is v1= 2.01V, v2=2.00V and v0= -0.99V. Experiment was carried with different values of input and output voltages. Which of the following is not possible considering experimental error?

A

v1= 1.99V, v2= 2.00V, v0 = 1.00V

B

v1= 1.00V, v2= 1.00V, v0 = 0V

C

v1= 1.00V, v2= 1.10V, v0 = 10.1V

D

v1= 0.99V, v2= 2.00V, v0 = 1.00V

An amplifier of gain 1000 is made into a feedback amplifier by feeding 9.9% of its output voltage in series with the input opposing. If f_L = 20 Hz and f_H = 200 kHz for the amplifier without feedback, then due to the feedback

A

the gain decreases by 10 times

B

the output resistance increases by 10 times

C

the f_H increases by 100 times

D

the input resistance decreases by 100 times

A student performs an experiment with a Francis turbine. He accidently set the RPM of Francis turbine to 1400 rpm instead of 700 rpm. He reported the power to be 1 MW. His teacher asks him to perform the same experiment using the correct RPM. The student performs the same experiment again, but this time the erroneously doubled the flow velocity. What does the student report the power to be?

A

0.5 MW

B

0.25 MW

C

2 MW

D

1 MW

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Gm.

A

1 A/V

B

10 A/V

C

100 A/V

D

1000 A/V

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Av.

A

9.09 V/V

B

10 V/V

C

90.9 V/V

D

100 V/V

An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Gvo.

A

53.3 V/V

B

63.3 V/V

C

73.3 V/V

D

83.3 V/V

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