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A. B. C. D.: 1. For The System in The Given Figure The Characteristic Equation Is

This document contains 10 multiple choice questions about control systems concepts such as characteristic equations, transfer functions, stability, feedback, and impulse responses. Key ideas assessed include: 1) Characteristic equations describe the dynamics of a system and can be derived from the system's transfer function. 2) Mechanical impedance is the ratio of force to velocity, analogous to electrical impedance as the ratio of voltage to current. 3) Closed loop transfer functions can be determined by combining open loop transfer functions using block diagrams. 4) A system's stability depends only on its characteristics and not on any inputs. 5) Pole-zero plots can be used to determine a system's transfer function from properties

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Armando Lios
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338 views10 pages

A. B. C. D.: 1. For The System in The Given Figure The Characteristic Equation Is

This document contains 10 multiple choice questions about control systems concepts such as characteristic equations, transfer functions, stability, feedback, and impulse responses. Key ideas assessed include: 1) Characteristic equations describe the dynamics of a system and can be derived from the system's transfer function. 2) Mechanical impedance is the ratio of force to velocity, analogous to electrical impedance as the ratio of voltage to current. 3) Closed loop transfer functions can be determined by combining open loop transfer functions using block diagrams. 4) A system's stability depends only on its characteristics and not on any inputs. 5) Pole-zero plots can be used to determine a system's transfer function from properties

Uploaded by

Armando Lios
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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1.

For the system in the given figure the characteristic


equation is

A.

B.
C. K(s + 1)(s + 3) = 0
D. s(s + 2) = 0
Answer: Option A
Explanation:

Transfer function = .

Hence characteristic equation is .


2. Mechanical impedance is the ratio of
A. rms force to rms velocity

B. rms force to rms displacement

C. rms velocity to rms displacement

D. none of the above


Answer: Option A
Explanation:

In force voltage analogy force is analogous to voltage and velocity to current. Just as ,
force/velocity = mechanical impedance.
3. For the system in the given figure. The transfer function C(s)/R(s) is

A. G1 + G2 + 1

B. G1 G2 + 1

C. G1 G2 + G2 + 1

D. G1 G2 + G1 + 1
Answer: Option C
Explanation:
Transfer function = (G1 + 1) G2 + 1 = G1 G2 + G2 + 1.
4. Whether a linear system is stable or unstable that it
A. is a property of the system only

B. depends on the input function only

C. both (a) and (b)

D. either (a) or (b)


Answer: Option A
Explanation:
Stability is a property of the system only.
5.

For the system of the given figure the transfer function =

A.

B.

C.

D.

Answer: Option B
Explanation:

, E0(s) = [I(s)][Z2(s)] or .

6. In the given figure shows pole-zero plot. If steady state gain is 2 the transfer function G(s) is
A.

B.

C.

D.

Answer: Option A
Explanation:
The zero at - 1 gives the term (s + 1) in the numerator.
The poles at (- 2 + j1) and (- 2 - j1) give (s2 + 4s + 5) term is the denominator. Gain is 2.
7. If a system is to follow arbitrary inputs accurately the bandwidth should be
A. large

B. small

C. very small

D. neither small nor large


Answer: Option A
Explanation:
Arbitrary inputs require large bandwidth
8. For the system of the given figure, the damping ratio of closed loop poles is

A. 1.5

B. 1

C. 0.5

D. 0.25
Answer: Option C
Explanation:

The standard form of characteristic equation is .

Therefore .
9. Assertion (A): Potentiometers can not be used as error detectors in position control systems.
Reason (R): The resolution of a potentiometer places an upper limit on its accuracy
A. Both A and R are correct and R is correct explanation of A

B. Both A and R are correct but R is not correct explanation of A

C. A is correct but R is wrong

D. R is correct but A is wrong


Answer: Option D
Explanation:
Potentiometers are used as error detectors.
10.
For a first order system having transfer function , the unit impulse response is
-t/T
A. e

B. T e-t/T

C.

D. T2 e-t/T
Answer: Option C
Explanation:

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