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FEEDBACK AND CONTROL SYSTEMS

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.

To direct, regulate or to command.

a)

control

b)

maintain

c)

feedback

d)

setpoint

2.

What do you call the stimulus that is being fed to a system?

a)

stimuli

b)

response

c)

actuation

d)

input

3.

A description of the behavior of the system using mathematics.

a)

Laplace transform

b)

Complex domain

c)

mathematical model

d)

formulation

4.

A case where the feedback is subtracted from the input signal.

a)

Positive feedback

b)

negative feedback

c)

open loop

d)

closed loop

5.

A part of the control system which manipulates the plant.

a)

controller

b)

manipulator

c)

actuator

d)

plant

6.

A small amount of output is taken so that it can be compared with the input for proper control.

a)

sampling

b)

error measurement

c)

closed-loop

d)

feedback

7.

The difference between the input and the forced response.

a)

steady-state error

b)

forced error

c)

feedback

d)

actuating signal

8.

A portion of the total response which states how the system acquires or dissipated energy.

a)

Steady-State response

b)

Steady-State error

c)

Natural or forced response

d)

Natural or transient response

9.

A device or a system under control.

a)

Actuator

b)

Output response

c)

Plant or process

d)

Feedback

10.

A type of control system where human serves as the controller of a mechanical system.

a)

Manmade with biological

b)

Natural

c)

Open-loop

d)

Closed-loop

11.

The difference between the input and the feedback signal.

a)

Steady-state error

b)

Actuating signal

c)

Feedback signal

d)

Feedback ratio

12.

The initial value of an impulse signal.

a)

Constant

b)

infinite

c)

unity

d)

zero

13.

Which of the following is a first-order system?

a)

RC circuit

b)

RLC circuit

c)

LC circuit

d)

All of these

14.

The time it takes for a first order system to increase the magnitude from zero to 63% of its final value.

a)

Time response

b)

Time constant

c)

Charge time

d)

Settling time

15.

Find the time constant of a system with transfer function 2/(s+10)

a)

10 s

b)

1 s

c)

0.1 s

d)

0.01 s

16.

What is the transfer function VL(s)/Vi(s) of a series RL?

a)

A. s/ (s + R/L)

b)

B. Ls/ (s + R/L)

c)

C. s/ (s + V/R)

d)

D. Rs/ (s + L/R)

17.

Find the rise time of a system with transfer function 2/(s+10)

a)

22 s

b)

0.22 s

c)

2.2 s

d)

22ms

18.

Find the settling time of a system with transfer function 2/(s+10)

a)

40 s

b)

0.4 s

c)

4 s

d)

40 ms

19.

The damping ratio of a critically damped system.

a)

1

b)

>0

c)

Between 1 and 0

d)

Maximum

20.

The percent overshoot is greater than 100%. The type of response is ___

a)

Critically damped 2nd Order

b)

Undamped 2nd Order

c)

Under damped 2nd Order

d)

Overdamped 2nd Order

21.

The poles are complex, with no real component. The response is ___

a)

Critically damped 2nd Order

b)

Undamped 2nd Order

c)

Under damped 2nd Order

d)

Overdamped 2nd Order

22.

Instability is attributed to what part of the total response?

a)

transient or natural response

b)

steady state or forced response

c)

natural or forced response

d)

steady-state and transient response

23.

Physically, what will happen to unstable systems?

a)

The sensitivity will decrease

b)

The sensitivity will increase

c)

There will be a large error

d)

Self-destruction

24.

A block that represents a subsystem contains the ___ of the system.

a)

Transfer function

b)

Characteristic polynomial

c)

Feedback signal

d)

Stability

25.

The directionality of transmissions in a block diagram are always ___

a)

unidirectional

b)

bidirectional

c)

in a loop

d)

negative feedback

26.

A block diagram component that describes the linear mixing of signals.

a)

summer

b)

pick-off points

c)

parallel

d)

feedback

27.

The output signal from a block is the product of the input signal and the ___

a)

C(s)

b)

Transfer function

c)

Feedback transfer function

d)

Actuating signal

28.

The simplified form of cascaded blocks is the ___ of the transfer function of each block.

a)

product

b)

sum

c)

difference

d)

ratio

29.

Positive feedback can cause a pole to be at ___ of the complex plane.

a)

Asymmetry

b)

Axis of imaginaries

c)

LPF

d)

RHP

30.

The summer and pick-off points are converted into a ___ in signal flow graphs.

a)

node

b)

point

c)

transmission

d)

junction

31.

The transmission from the source to the sink of a system.

a)

loop

b)

non touching loops

c)

path

d)

forward path

32.

A continuous unidirectional transmission.

a)

loop

b)

non touching loops

c)

path

d)

forward path

33.

Two blocks, A and B in parallel is simplified as ___

a)

A. A + B

b)

B. AB

c)

C. A/(1+AB)

d)

D. B/(1+AB)

34.

A forward block with transfer function G1 has two feedback blocks in cascade, G2 and H. The simplified transfer function is ___.

a)

G1/(1+H G1 G2)

b)

H G2/(1+H G1 G2)

c)

G2/(1+H G1 G2)

d)

H G1/(1+H G1 G2)

35.

A unity feedback system has a block with transfer function (2/(s+1)). The simplified function is __.

a)

2/(s + 3)

b)

2/(s – 3)

c)

2/(s – 1)

d)

2/(2s – 1)

36.

A negative feedback system has a forward block 1/(s+2) and the feedback block (1/s). The simplified function is __.

a)

A. s/(s2+2s+1)s/(s^2 + 2s + 1)

b)

B. s/(s2+2s–1)s/(s^2 + 2s – 1)

c)

C. 1s2+2s+1\frac{1}{s^2 + 2s + 1}

d)

D. 1s2+2s−1\frac{1}{s^2 + 2s - 1}

37.

A negative feedback system has a forward block (1/s) and the feedback block 1/(s+2). The simplified function is __.

a)

s+2s2+2s+1\frac{s+2}{s^2 + 2s + 1}

b)

s+2s2+2s−1\frac{s+2}{s^2 + 2s - 1}

c)

s/(s2+2s+1)s/(s^2 + 2s + 1)

d)

s/(s2+2s–1)s/(s^2 + 2s – 1)

38.

A system having more than one input and output.

a)

MIMO

b)

SISO

c)

BIBO

d)

MISO

39.

Statement A: Summers and take-off points can swap positions in a block diagram without altering the signal flow. Statement B: Summers in cascade can be combined.

a)

True, True

b)

True, False

c)

False, True

d)

False, False

40.

A system is ___ if all poles have a negative real component.

a)

Unstable

b)

Marginally stable

c)

Stable

d)

Infinite error

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