Consider the following statements: 1. The effect of feedback is to reduce the system error 2. Feedback increases the gain of the system in one frequency range but decreases in another 3. Feedback can cause a system that is originally stable to become unstable Which of these statements are correct.

Consider the following statements: 1. The effect of feedback is to reduce the system error 2. Feedback increases the gain of the system in one frequency range but decreases in another. 3. Feedback can cause a system that is originally stable to become unstable Which of these statements are correct.

A

1,2 and 3

B

1 and 2

C

2 and 3

D

1 and 3

Consider the following statements with respect to the feedback of the control systems. i. Feedback can improve stability or be harmful to stability if it is not properly applied. ii. Feedback can always improve stability iii. In many situations the feedback can reduce the effect of noise and disturbance on system performance. iv. In general the sensitivity of the system gain of a feedback system of a parameter variation depends on where the parameter is located.

A

i, ii, iii and iv only

B

i, ii and iii only

C

i, iii and iv only

D

i, ii and iv only

Consider the following statements with respect to the feedback of the control systems: 1. Feedback can improve stability or be harmful to stability if it is not properly applied. 2. Feedback can always improve stability 3. In many situations the feedback can reduce the effect of noise and disturbance on system performance. 4. In general the sensitivity of the system gain of a feedback system of a parameter variation depends on where the parameter is located.

A

1,2 and 3 only

B

1,3 and 4 only

C

1,2 and 4 only

D

1,2,3 and 4 only

Consider the following statements with reference to the periodic table of chemical elements.
1. Ionization potential gradually decreases along a period.
2. In a group of elements, electron affinity decreases as the atomic weight increases.
3. In a given period, electronegativity decreases as the atomic number increases.
Which of these statement(s) is/are correct?

A

Only 1

B

Only 2

C

Only 1 and 3

D

Only 2 and 3

The transfer function of a discrete time LTI system is given by
$$H\left( z \right) = {{2 - {3 \over 4}{z^{ - 1}}} \over {1 - {3 \over 4}{z^{ - 1}} + {1 \over 8}{z^{ - 2}}}}$$
Consider the following statements:
S₁ : The system is stable and causal for
$$ROC:\left| z \right| > {1 \over 2}$$
S₂ : The system is stable but not causal for
$$ROC:\left| z \right| S₃ : The system is neither stable nor causal for
$$ROC:{1 \over 4} Which one of the following statements is valid?

A

Both S1 and S2 are true

B

Both S2 and S3 true

C

Both S1 and S3 are true

D

S1, S2 and S3 are all true

The frequency response of the filter in the stop band. i. Decreases with increase in frequency ii. Increase with increase in frequency iii. Decreases with decrease in frequency iv. Increases with decrease in frequency

A

i and iv

B

ii and iii

C

i and ii

D

ii and iv

Direction : Two statements I and II are given. These statement may be either independent causes or may be effects of independent causes or a common cause. One of these statements may be the effect of the other statements. Read both the statements and decide which of the following answer choice correctly depicts the relationship between these two statements. Mark answer :

I. Majority of the students in the college expressed their opinion against the college authority's decision to break away from the university and become autonomous.
II. The university authorities have expressed their inability to provide grants to its constituent colleges.

A

Statement I is the cause and statement II is its effect

B

Statement II is the cause and statement I is its effect

C

Both the statements I and II are independent causes

D

Both the statements I and II are effects of independent causes

E

Both the statements I and II are effects of some common cause

Direction : Two statements I and II are given. These statement may be either independent causes or may be effects of independent causes or a common cause. One of these statements may be the effect of the other statements. Read both the statements and decide which of the following answer choice correctly depicts the relationship between these two statements. Mark answer :

I. Large numbers of people have fallen sick after consuming sweets from a particular shop in the locality.
II. Major part of the locality is flooded and has become inaccessible to outsides.

A

Statement I is the cause and statement II is its effect.

B

Statement II is the cause and statement I is its effect.

C

Both the statements I and II are independent causes.

D

Both the statements I and II are effects of independent causes.

E

Both the statements I and II are effects of some common cause.

In each of the followingquestions, two statements numbered I andII are given. These may to cause and effectrelationship between the two statements.These two statements may be the effect ofthe same cause or independent causes.These statements may be independentcauses without having any relationship.Read both the statements in each questionand mark your answer as: Statements:
I. The university has instructed al thecolleges under its jurisdiction to ban use ofmobile phones inside the college premises.
II. Majority of the teachers of the collegessigned a joint petition to the universitycomplaining the disturbances.

A

If statement I is the cause and II is its\effect.

B

If statement II is the cause and I is its\effect.

C

If both the statements I and II are\independent causes.

D

If both the statements I and II are\effects of independent causes.

Assertion (A): A linear, negative feedback control system is invariable stable if its open loop configuration is stable Reason (R): the negative feedback reduces the overall gain of the feedback.

A

Both A and R are true and R is correct explanation of A

B

Both A and R are true and R is not correct Explanation of A

C

A is True and R is false

D

A is False and R is true