wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Semiconductor diode

Total questions: 121

Worksheet time: 1hrs 10mins

Name
Class
Date
1.

Which among the following represents an illustration of closed loop system?

a)

Automatic washing machine

b)

Bread toaster

c)

Automatic electric iron box

d)

Electric hair drier

2.

Which terminology deals with the stimulus applied to a system from an external source?

a)

Input signal

b)

Output signal

c)

Error signal

d)

Feedback signal

3.

During a school science fair, Advait is showcasing his project on control systems. He has set up various devices to demonstrate how control systems work. He asks the audience, "Which of these is not a control system output device?"

a)

Projector

b)

LED

c)

Buzzer

d)

Actuator

4.

If poles of system are lying on the imaginary axis in s-plane, the system will be

a)

Unstable

b)

Marginally stable

c)

Conditionally stable

d)

Unstable

5.

Which system conveniently see the impact of poles and zeros on phase and gain margin?

a)

Root locus

b)

Nyquist plot

c)

Routh-Hurwitz criterion

d)

Bode plot

6.

For relative stability of the system which of the following is sufficient?

a)

Gain margin

b)

Phase margin

c)

Both (a) and (b)

d)

None of these

7.

Cut off is the slope of log-magnitude curve

a)

At the start of curve

b)

At the end of curve

c)

None of these

d)

Near the cut off frequency

8.

According to the property of state transition method, e0 is equal to _____

a)

I

b)

A

c)

e-At

d)

-eAt

9.

What is used directly to modify the behaviour of a system?

a)

Input

b)

Output

c)

Feedback

d)

Processing

10.
What is the algebraic sum of the reference input and feedback?
a)
Error Signal
b)
Error Detector
c)
Controlled system
d)
Controlled output
11.
Stability of a system implies that :
a)
Small changes in the system input does not result in large change in system output
b)
Small changes in the system parameters does not result in large change in system output
c)
Small changes in the initial conditions does not result in large change in system output
d)
All of the above mentioned
12.
The roots of the transfer function do not have any effect on the stability of the system.
a)
True
b)
False
13.

The mechanism of control of body temperature is Non Feedback system.

a)

True

b)

False

14.

A car is moving at a constant speed of 50 km/h, which of the following is the feedback element for the driver ?

a)

Clutch

b)

Eyes

c)

Needle of speedometer

d)

Steering wheel

15.

Transfer function of a system is used to calculate which of the following ?

a)

The order of the system

b)

The time constant

c)

The output for any given input

d)

The steady state gain

16.

Spring constant in force-voltage analogy is analogous to

a)

Capacitance

b)

Current

c)

Resistance

d)

Reciprocal of capacitance

17.

To model a rotational mechanical system the three basic elements required are denoted by

a)

M, B, K

b)

J, B, K

c)

G, K, J

d)

M, B, J

18.

Transfer function of a system is defined as the ratio of output to input in

a)

Z-transformer

b)

Fourier transform

c)

Laplace transform

d)

All of these

19.

How is an output represented in the control systems?

a)

r(t)

b)

x(t)

c)

c(t)

d)

y(t)

20.

Which among the following represents an illustration of closed loop system?

a)

Automatic washing machine

b)

Bread toaster

c)

Automatic electric iron box

d)

Electric hair drier

21.

Which terminology deals with the stimulus applied to a system from an external source?

a)

Input signal

b)

Output signal

c)

Error signal

d)

Feedback signal

22.

Which among the following illustrate an example of open loop system?

a)

Water level controller

b)

Servo voltage stabilizer

c)

Automatic tea maker

d)

Automatic electric iron

23.

Which of these is not a control system output device?

a)

Projector

b)

LED

c)

Buzzer

d)

Actuator

24.

If poles of system are lying on the imaginary axis in s-plane, the system will be

a)

Unstable

b)

Marginally stable

c)

Conditionally stable

d)

Unstable

25.

Which system conveniently see the impact of poles and zeros on phase and gain margin?

a)

Root locus

b)

Nyquist plot

c)

Routh-Hurwitz criterion

d)

Bode plot

26.

For relative stability of the system which of the following is sufficient?

a)

Gain margin

b)

Phase margin

c)

Both (a) and (b)

d)

None of these

27.

Cut off is the slope of log-magnitude curve

a)

At the start of curve

b)

At the end of curve

c)

None of these

d)

Near the cut off frequency

28.

According to the property of state transition method, e0 is equal to _____

a)

I

b)

A

c)

e-At

d)

-eAt

29.

What is used directly to modify the behaviour of a system?

a)

Input

b)

Output

c)

Feedback

d)

Processing

30.
What is the algebraic sum of the reference input and feedback?
a)
Error Signal
b)
Error Detector
c)
Controlled system
d)
Controlled output
31.
Stability of a system implies that :
a)
Small changes in the system input does not result in large change in system output
b)
Small changes in the system parameters does not result in large change in system output
c)
Small changes in the initial conditions does not result in large change in system output
d)
All of the above mentioned
32.
The roots of the transfer function do not have any effect on the stability of the system.
a)
True
b)
False
33.

The mechanism of control of body temperature is Non Feedback system.

a)

True

b)

False

34.

A car is moving at a constant speed of 50 km/h, which of the following is the feedback element for the driver ?

a)

Clutch

b)

Eyes

c)

Needle of speedometer

d)

Steering wheel

35.

Transfer function of a system is used to calculate which of the following ?

a)

The order of the system

b)

The time constant

c)

The output for any given input

d)

The steady state gain

36.

Spring constant in force-voltage analogy is analogous to

a)

Capacitance

b)

Current

c)

Resistance

d)

Reciprocal of capacitance

37.

To model a rotational mechanical system the three basic elements required are denoted by

a)

M, B, K

b)

J, B, K

c)

G, K, J

d)

M, B, J

38.

Transfer function of a system is defined as the ratio of output to input in

a)

Z-transformer

b)

Fourier transform

c)

Laplace transform

d)

All of these

39.

How is an output represented in the control systems?

a)

r(t)

b)

x(t)

c)

c(t)

d)

y(t)

40.

To increase damping of pair of complex roots compensator used is

a)

Phase lag

b)

Phase lead

c)

Phase lag lead

d)

One with 60° lead circuit

41.

If poles of system are lying on the imaginary axis in s-plane, the system will be

a)

Unstable

b)

Marginally stable

c)

Conditionally stable

d)

Unstable

42.

Which system conveniently see the impact of poles and zeros on phase and gain margin?

a)

Root locus

b)

Nyquist plot

c)

Routh-Hurwitz criterion

d)

Bode plot

43.

To study time delay of the system which of the following is used?

a)

Nyquist plot

b)

Bode plot

c)

Routh Hurwitz method

d)

Nicholas chart

44.

Closed loop poles are

a)

Zeros of 1+G(S). H(s)

b)

Zeros of G(s) H(s)

c)

Poles of G(s) H(s)

d)

Poles of 1 + G(s) H(s)

45.

Feed back control system are basically

a)

Low pass filter

b)

High pass filter

c)

Band pass filter

d)

Band stop filter

46.

Plot of the constant gain loci of the system is

a)

Asymptote

b)

Circle with centre at the origin

c)

Parabola

d)

Ellipse

47.

Frequency response means

a)

Transient response of a system to a sinusoidal input

b)

Steady state response of a system to a sinusoidal input

c)

Oscillatory response of a system to a sinusoidal input

d)

None of these

48.

Gain margin expressed in decibels is

a)

Positive if Kg greater than 1 and negative for Kg less than 1

b)

Negative if Kg greater than 1 and negative for Kg less than 1

c)

Always zero

d)

Infinity for Kg equal to 1

49.

In Nyquist criterion roots of the characteristic equation are given by

a)

Zeros of open loop transfer function

b)

Zeros of closed loop transfer function

c)

Poles of closed loop transfer function

d)

Poles of open loop transfer function

50.

For relative stability of the system which of the following is sufficient?

a)

Gain margin

b)

Phase margin

c)

Both (a) and (b)

d)

None of these

51.

For G(S) F(S) = (k(S+z))/(S+p), (z < p) the plot is

a)

One pole on the imaginary axis

b)

One zero on the right-hand side of the plane

c)

2 poles and 2 zeros on the left-hand side of plane

d)

One pole and one zero on the left-hand side of plane

52.

Bode analysis method can be applied

a)

If transfer function has no poles and zeros on R.H. of s-plane

b)

If transfer function has no poles on R.H. of s-plane

c)

If transfer function has no zero on R.H. of s-plane

d)

To all transfer functions

53.

Cut off is the slope of log-magnitude curve

a)

At the start of curve

b)

At the end of curve

c)

None of these

d)

Near the cut off frequency

54.

Slope in Bode plot is expressed as

a)

– 6 db/decade

b)

– 6 db/octave

c)

– 7 db/octave

d)

– 8 db/octave

55.

Polar plots for+ve and –ve frequencies

a)

Are always symmetrical

b)

Can never be symmetrical

c)

May be symmetrical

d)

None of these

56.

According to the property of state transition method, e0 is equal to _____

a)

I

b)

A

c)

e-At

d)

-eAt

57.

Which mechanism in control engineering implies an ability to measure the state by taking measurements at output?

a)

Controllability

b)

Observability

c)

Differentiability

d)

Adaptability

58.

State model representation is possible using _________

a)

Physical variables

b)

Phase variables


c)

Canonical state variables

d)

All of the above

59.

State space analysis is applicable even if the initial conditions are _____

a)

Zero

b)

Non equal

c)

Equal

d)

Not zero

60.

In positive Feedback system,

a)

feedback signal in phase with Input signal

b)

feedback signal out of phase with input signal

c)

no relation between feedback signal and input signal

d)

none of the above

61.

Transfer Function is Ratio of

a)

Laplace transform of input to the Laplace transform of output with all initial condition is zero

b)

Laplace transform of output to the Laplace transform of Input with all initial condition is zero

c)

Laplace transform of output to the Laplace transform of Input

d)

all of the above

62.

A system which is not having Feedback is called

a)

closed loop system

b)

open loop system

c)

both

d)

non of the above

63.
What is the algebraic sum of the reference input and feedback?
a)
Error Signal
b)
Error Detector
c)
Controlled system
d)
Controlled output
64.
Feedback control systems are referred to as closed loop systems.
a)
True
b)
False
65.
Maintaining body temperature is an example of a:
a)
negative feedback loop
b)
positive feedback loop
66.
If the environment gets cold, we will often shiver in order to:
a)
keep body temperature the same as the external temperature
b)
decrease body temperature
c)
increase body temperature
d)
regulate blood pressure
67.
A group of parts that work together to achieve a goal. 
a)
matter 
b)
system 
c)
conduction 
d)
solar energy 
68.
This is a system where the outputs do not become the inputs. 
a)
social system 
b)
open loop system
c)
ecosystem 
d)
closed loop system 
69.
This is information used to control the process or output of a system. 
a)
subsystems 
b)
input 
c)
feedback 
d)
banana 
70.

Ohms law applicable at

a)

Constant Voltage

b)

constant Temperature

c)

constant Current

d)

Non of the above

71.

the motion taking place in a straight line is known as

a)

Rotational motion

b)

translational motion

c)

both

d)

none

72.

Every object in a state of uniform motion will remain in that state of motion unless an external force act on it.

a)

newton's first law

b)

newton's second law

c)

newton's third law

d)

none

73.

what is the spring equation in transalation mechanical system?

a)

F= KX

b)

F= K/X

c)

both

d)

None

74.

the law which is used for mathematical modelling of electrical system is

a)

Kirchoff"s Law

b)

newton's law

c)

Lenz's law

d)

None

75.

How do u relate the DC motor speed?

a)

DC motor speed is directly proportional to armature voltage and inversely proportional to flux in field winding.

b)

DC motor speed is directly inversely proportional to armature voltage and inversely proportional to flux in field winding.

c)

DC motor speed is directly proportional to armature voltage and flux in field winding.

d)

DC motor speed is directly proportional to armature voltage and proportional to flux in field winding.

76.

How do u obtain desired speed of an armature controlled DC motor ?

a)

by varying armature current

b)

by varying the armature voltage

c)

by varying emf

d)

by varying transformer voltage

77.

The Law which we are applying for motion of the Mechanical system is

a)

Kirchoff's current law

b)

Kirchoff's voltage law

c)

newton's law of motion

d)

all of the above

78.

The frictional coefficient is Mechanical Translational system is

a)

A

b)

B

c)

T

d)

C

79.

What is Mathematical modelling?

a)

The mathematical models are equations which describe the relationship between the input and output of a system.

b)

Represent in mathematical term but no relation between input and outpur.

c)

Both

d)

None

80.

4.What is electrical analogous quantity for spring element (K) in force-voltage analogy?

a)

L

b)

R

c)

1/C

d)

C

81.
The roots of the transfer function do not have any effect on the stability of the system.
a)
True
b)
False
82.
Roots on the imaginary axis makes the system :
a)
Stable
b)
Unstable
c)
Marginally stable
d)
Linear
83.

Which controller can improve the transient response

a)

Derivative controller

b)

Proportional controller

c)

On-Off controller

d)

No answer

84.

In force-voltage analogy, velocity is analogous to

a)

Current

b)

Charge

c)

Inductance

d)

Capacitance

85.

Transfer function of a system is used to calculate which of the following ?

a)

The order of the system

b)

The time constant

c)

The output for any given input

d)

The steady state gain

86.

Mass, in force-voltage analogy, is analogous to

a)

Charge

b)

Current

c)

Inductance

d)

Resistance

87.

To model a rotational mechanical system the three basic elements required are denoted by

a)

M, B, K

b)

J, B, K

c)

G, K, J

d)

M, B, J

88.

In translational mechanical system the opposing force offered by mass, dashpot, spring is proportional to

a)

Load, Friction, Elasticity

b)

Speed, Velocity, Length

c)

Acceleration, Velocity, Displacement

d)

Acceleration, Viscosity, Duration

89.

Spring constant in force-voltage analogy is analogous to

a)

Capacitance

b)

Current

c)

Resistance

d)

Reciprocal of capacitance

90.
Which of these is not a control system?
a)
Home PC
b)
Burglar Alarm
c)
Greenhouse Climate Control
d)
Automated Car Park Barrier
91.

How many laws are there in newton's law of motion?

a)

1

b)

2

c)

3

d)

4

92.

A signal other than the reference input that tends to affect the value of controlled variable is known as

a)

Disturbance

b)

Command

c)

Control element

d)

Reference input

93.

Which of the following is the input to a controller?

a)

Error Detector

b)

Desired variable value

c)

servo signal

d)

sensed signal

94.

In ______ controller The output signal is directly proportional to the Error signal.

a)

I controller

b)

P controller

c)

D controller

d)

Both P and I

95.

The initial response when the output is not equal to the input is known as ?

a)

Dynamic response

b)

Transient response

c)

Error response

d)

None of the above

96.

Potentiometer is used to converts

a)

Electrical Energy to Mechanical energy

b)

Mechanical energy to electrical energy

c)

Mechanical to chemical energy

d)

chemical energy to Mechanical energy

97.

_______ Potentiometer converts the linear displacement in to voltage.

a)

Rotational

b)

Translational

c)

variabale

d)

none

98.

If G1, G2 and G3 gains are connected in cascade connection, Then the total equivalent gain is

a)

G1.G2.G3

b)

G1+G2+G3

c)

G1+G1-G3

d)

ALL

99.

What is the algebric sum of reference input and feedback?

a)

controlled system

b)

Error detector

c)

controlled outpur

d)

Error signal

100.

In positive Feedback system,

a)

feedback signal in phase with Input signal

b)

feedback signal out of phase with input signal

c)

no relation between feedback signal and input signal

d)

none of the above

101.

A system which is not having Feedback is called

a)

closed loop system

b)

open loop system

c)

both

d)

non of the above

102.
Maintaining body temperature is an example of a:
a)
negative feedback loop
b)
positive feedback loop
103.
A group of parts that work together to achieve a goal. 
a)
matter 
b)
system 
c)
conduction 
d)
solar energy 
104.
This is information used to control the process or output of a system. 
a)
subsystems 
b)
input 
c)
feedback 
d)
banana 
105.

In DC motor, back

emf is directly proportional to speed ( say true/false )

a)

TRUE

b)

FALSE

106.

In force-voltage analogy, what is velocity analogous to

a)

CURRENT

b)

CHARGE

c)

INDUCTANCE

d)

CAPACITANCE

107.

Block Diagram can be used to represent:

a)

Only linear systems

b)

Only non-linear systems

c)

only time-variant systems

d)

time-invariant as well as time-variant

108.

Signal flow graphs can be used to represent:

a)

Only linear systems

b)

Only non-linear systems

c)

only time-variant systems

d)

time-invariant as well as time-variant

109.

Which system is also known as automatic control system?

a)

open loop control system

b)

Closed loop control system

c)

both 1 & 2

d)

None of these

110.

In open loop system____

a)

the control action depends on the size of the system

b)

the control action depends on system variables

c)

the control action depends on the input signal

d)

the control action is independent of the output

111.

A control system in which the control action is somehow dependent on the output is known as

a)

Open loop system

b)

Semiclosed loop system

c)

Closed loop system

d)

None of the above

112.

With feedback _______ increases

a)

system stability

b)

sensitivity

c)

gain

d)

effects of disturbing signals

113.

Reference input minus the primary feedback is called ________ signal

a)

Manipulated variable

b)

Error signal

c)

Zero signal

d)

Primary feedback

114.

The roots of the denominator polynomial of the transfer function are called:

a)

ZEROS

b)

POLES

c)

SINGULARS

d)

PLURALS

115.

A third-order system will have:

a)

3 poles

b)

3 zeros

c)

1 Zero and 2 poles

d)

1 pole and 2 zeros

116.

Transfer function is the ratio of

a)

Laplace transform of output to input

b)

Laplace transform of output to Laplace transform of input.

c)

Laplace transform of output to Laplace transform of input assuming all initial condition zero.

d)

Output to Laplace transform of input.

117.

In a signal flow graph method, how is an overall transfer function of a system obtained?

a)

Poisson's equation

b)

Mason's equation

c)

Block diagram reduction rule

d)

Lagrange's equation

118.

For the system in the given figure, the transfer function C(s)/R(s) is:

a)

G1 + G2 + G3

b)

G1 G2 + G3

c)

G1 G2 G3

d)

(G1 + G2) G3

119.

A node in SFG which has only outgoing branches is called a:

a)

Source Node

b)

Sink Node

c)

Intermediate node

d)

general node

120.

A node in SFG which has only incoming branches is called a:

a)

Source Node

b)

Sink Node

c)

Intermediate node

d)

general node

121.

A transfer function is defined only for:

a)

Linear time-varying system

b)

Linear time-invariant system

c)

linear and Non-linear systems

d)

All of these

Similar Resources on Wayground

Quiz_Review_Exam3

122 questions

Quiz_Review_Exam3

quiz

Worksheet

•

University

Compre

120 questions

Compre

quiz

Worksheet

•

University