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All questions of Design of sampled data control systems for Electrical Engineering (EE) Exam
For minimum phase systems:- a)Pole must lie on left plane
- b)Zeroes must lie on left plane
- c)Poles and zeroes must lie on left plane
- d)Both must lie on right plane
Correct answer is option 'C'. Can you explain this answer?
For minimum phase systems:
a)
Pole must lie on left plane
b)
Zeroes must lie on left plane
c)
Poles and zeroes must lie on left plane
d)
Both must lie on right plane
|
Rajat Kumar answered |
Answer: c
Explanation: For minimum phase systems poles and zeroes must lie on the right s-plane.
Explanation: For minimum phase systems poles and zeroes must lie on the right s-plane.
Consider the function F (s) =5/s (s2+s+2) , where F (s) is the Laplace transform f (t). Then the final value theorem is equal to - a)5
- b)5/2
- c)Zero
- d)Infinity
Correct answer is option 'B'. Can you explain this answer?
Consider the function F (s) =5/s (s2+s+2) , where F (s) is the Laplace transform f (t). Then the final value theorem is equal to
a)
5
b)
5/2
c)
Zero
d)
Infinity
|
Sanvi Kapoor answered |
Answer: b
Explanation: Final value theorem is given for the stable system only and this is a type 1 system and for step input the final value can be calculated as 5/2.
Explanation: Final value theorem is given for the stable system only and this is a type 1 system and for step input the final value can be calculated as 5/2.
The phase margin (in degrees) of a system having the loop transfer function G(s) H(s)=2√3/s(s+1) is: - a)45°
- b)-30°
- c)60°
- d)30°
Correct answer is option 'D'. Can you explain this answer?
The phase margin (in degrees) of a system having the loop transfer function G(s) H(s)=2√3/s(s+1) is:
a)
45°
b)
-30°
c)
60°
d)
30°
|
Sharmila Bajaj answered |
Answer: d
Explanation: Phase margin is calculated at gain cross over frequency where magnitude of the transfer function is 1.
Explanation: Phase margin is calculated at gain cross over frequency where magnitude of the transfer function is 1.
The important figures of merit to the system in frequency domain are :- a)Maximum value of resonant peak
- b)Value of resonance frequency
- c)Maximum value of resonant peak and Value of resonance frequency
- d)Minimum value of resonance frequency
Correct answer is option 'C'. Can you explain this answer?
The important figures of merit to the system in frequency domain are :
a)
Maximum value of resonant peak
b)
Value of resonance frequency
c)
Maximum value of resonant peak and Value of resonance frequency
d)
Minimum value of resonance frequency
|
|
Isha Singh answered |
Answer: c
Explanation: The important figures of merit to the system in frequency domain are maximum value of resonance peak and frequency at which it occurs.
Explanation: The important figures of merit to the system in frequency domain are maximum value of resonance peak and frequency at which it occurs.
The angles of asymptotes of the root loci of the equation s3+5s2+(K+2)s+K=0 are: - a)0° and 270°
- b)0° and 180°
- c)90° and 270°
- d)90° and 180°
Correct answer is option 'C'. Can you explain this answer?
The angles of asymptotes of the root loci of the equation s3+5s2+(K+2)s+K=0 are:
a)
0° and 270°
b)
0° and 180°
c)
90° and 270°
d)
90° and 180°
|
Ravi Singh answered |
Answer: c
Explanation: P-Z =2
Angle of asymptote = (2q+1)180°/P-Z
Angle are 90° and 270°.
Explanation: P-Z =2
Angle of asymptote = (2q+1)180°/P-Z
Angle are 90° and 270°.
Consider the system represented by the equation given below. What would be the total phase value at ω = 0?
200/[s3 (s + 3) (s + 6) (s + 10)]. - a)-90°
- b)-180°
- c)-270°
- d)-360°
Correct answer is option 'C'. Can you explain this answer?
Consider the system represented by the equation given below. What would be the total phase value at ω = 0?
200/[s3 (s + 3) (s + 6) (s + 10)].
200/[s3 (s + 3) (s + 6) (s + 10)].
a)
-90°
b)
-180°
c)
-270°
d)
-360°
|
Mayank Sengupta answered |
Answer: c
Explanation: The phase can be calculated by the basic formula for calculating phase angle
Explanation: The phase can be calculated by the basic formula for calculating phase angle
In a feedback control system, phase margin(PM) is
1. Directly proportional to G
2. Inversely proportional to G
3. Independent of G
4. Zero when G =0
Which of the above statements are correct?- a)1 and 2
- b)2 and 3
- c)3 and 4
- d)1 and 4
Correct answer is option 'D'. Can you explain this answer?
In a feedback control system, phase margin(PM) is
1. Directly proportional to G
2. Inversely proportional to G
3. Independent of G
4. Zero when G =0
Which of the above statements are correct?
1. Directly proportional to G
2. Inversely proportional to G
3. Independent of G
4. Zero when G =0
Which of the above statements are correct?
a)
1 and 2
b)
2 and 3
c)
3 and 4
d)
1 and 4
|
Ameya Nambiar answered |
Answer: d
Explanation: For small values of G, PM is directly proportional to G and at G =0. P.M. =0.
Explanation: For small values of G, PM is directly proportional to G and at G =0. P.M. =0.
The loop transfer function of a system is given by G(s) H(s) =10e-Ls/s. The phase crossover frequency is 5rad/s. The value of the dead time L is- a)π/20
- b)π/10
- c)-π/20
- d)Zero
Correct answer is option 'B'. Can you explain this answer?
The loop transfer function of a system is given by G(s) H(s) =10e-Ls/s. The phase crossover frequency is 5rad/s. The value of the dead time L is
a)
π/20
b)
π/10
c)
-π/20
d)
Zero
|
Sravya Khanna answered |
Answer: b
Explanation: – π/2-180/π*L*5 = -π
5L =π/2
L =π/10.
Explanation: – π/2-180/π*L*5 = -π
5L =π/2
L =π/10.
Cut-off rate is the ability of the system to distinguish the signal from _____________- a)Bandwidth
- b)Noise
- c)Resonance peak
- d)Magnitude
Correct answer is option 'B'. Can you explain this answer?
Cut-off rate is the ability of the system to distinguish the signal from _____________
a)
Bandwidth
b)
Noise
c)
Resonance peak
d)
Magnitude
|
Neha Nambiar answered |
Answer: b
Explanation: Cut-off rate is the ability of the system to distinguish the signal from noise.
Explanation: Cut-off rate is the ability of the system to distinguish the signal from noise.
Phase margin is:- a)It is amount of additional phase lag at the gain cross over frequency required to bring the system to the verge of instability
- b)It is always positive for stable feedback systems
- c)It is calculated at gain cross over frequency
- d)All of the mentioned
Correct answer is option 'D'. Can you explain this answer?
Phase margin is:
a)
It is amount of additional phase lag at the gain cross over frequency required to bring the system to the verge of instability
b)
It is always positive for stable feedback systems
c)
It is calculated at gain cross over frequency
d)
All of the mentioned
|
Malavika Nair answered |
Answer: d
Explanation: Phase margin is the measure of relative stability which is always positive for stable systems.
Explanation: Phase margin is the measure of relative stability which is always positive for stable systems.
Polar plots moving toward the imaginary axis makes the system:- a)Stable
- b)Marginally stable
- c)Conditionally stable
- d)Unstable
Correct answer is option 'D'. Can you explain this answer?
Polar plots moving toward the imaginary axis makes the system:
a)
Stable
b)
Marginally stable
c)
Conditionally stable
d)
Unstable
|
|
Sanchita Sharma answered |
Answer: d
Explanation: Polar plots moving toward the imaginary axis makes the system unstable.
Explanation: Polar plots moving toward the imaginary axis makes the system unstable.
The characteristic equation is s3+14s2+(45+K)s+K =0, centroid is located at (-x,0) then the value of x is ____________ - a)1
- b)2
- c)3
- d)4
Correct answer is option 'B'. Can you explain this answer?
The characteristic equation is s3+14s2+(45+K)s+K =0, centroid is located at (-x,0) then the value of x is ____________
a)
1
b)
2
c)
3
d)
4
|
Raj Singh answered |
Answer: b
Explanation: Differentiating the equation of K with respect to s and equating it to zero.Breakaway points are -2, -2+1.414j,-2-j1.414. so 2 is complex breakaway point.
Explanation: Differentiating the equation of K with respect to s and equating it to zero.Breakaway points are -2, -2+1.414j,-2-j1.414. so 2 is complex breakaway point.
The transfer function of a phase-lead controller is given by- a)(1+aTs)/(1+Ts) , a>1 T>0
- b)(1+aTs)/(1+Ts) , a<1 T>0
- c)(1-aTs)/(1+Ts) , a>1 T>0
- d)(1±Ts)/(1+Ts) , a<1 T>0
Correct answer is option 'A'. Can you explain this answer?
The transfer function of a phase-lead controller is given by
a)
(1+aTs)/(1+Ts) , a>1 T>0
b)
(1+aTs)/(1+Ts) , a<1 T>0
c)
(1-aTs)/(1+Ts) , a>1 T>0
d)
(1±Ts)/(1+Ts) , a<1 T>0
|
|
Om Saini answered |
Answer: a
Explanation: For the phase lead controller in which the stability and speed of response is more for the system, the magnitude of the pole must be greater than the magnitude of the zero.
Explanation: For the phase lead controller in which the stability and speed of response is more for the system, the magnitude of the pole must be greater than the magnitude of the zero.
The system with the open loop transfer function G(s) H(s) =1/s(s^2+s+1) has the gain margin of : - a)-6 dB
- b)0 dB
- c)3.5 dB
- d)6 dB
Correct answer is option 'B'. Can you explain this answer?
The system with the open loop transfer function G(s) H(s) =1/s(s^2+s+1) has the gain margin of :
a)
-6 dB
b)
0 dB
c)
3.5 dB
d)
6 dB
|
|
Uday Saini answered |
Answer: b
Explanation: Gain margin is calculated at phase cross over frequency where the phase is 180°.
Explanation: Gain margin is calculated at phase cross over frequency where the phase is 180°.
The gain margin (in dB) of a system having the loop transfer functionG(s) H(s) = 2 / s(s+1) is- a)0
- b)3
- c)6
- d)8
Correct answer is option 'D'. Can you explain this answer?
The gain margin (in dB) of a system having the loop transfer function
G(s) H(s) = 2 / s(s+1) is
a)
0
b)
3
c)
6
d)
8
|
|
Rithika Pillai answered |
Answer: d
Explanation: Gain margin of a system is calculated at the phase cross over frequency and expressed in decibels.
Explanation: Gain margin of a system is calculated at the phase cross over frequency and expressed in decibels.
For a type one system, the steady – state error due to step input is equal to- a)Infinite
- b)Zero
- c)0.25
- d)0.5
Correct answer is option 'B'. Can you explain this answer?
For a type one system, the steady – state error due to step input is equal to
a)
Infinite
b)
Zero
c)
0.25
d)
0.5
|
Shivani Saha answered |
Answer: b
Explanation: The steady state error is defined as the error between the final value and the desired response and the difference in the value of both will be the steady state error due to step input for type one system is zero.
Explanation: The steady state error is defined as the error between the final value and the desired response and the difference in the value of both will be the steady state error due to step input for type one system is zero.
The range of K for the stability of system is 0<K<100. For K =10, The gain Margin of the system- a)10
- b)5
- c)0.1
- d)0.5
Correct answer is option 'A'. Can you explain this answer?
The range of K for the stability of system is 0<K<100. For K =10, The gain Margin of the system
a)
10
b)
5
c)
0.1
d)
0.5
|
|
Aashna Dey answered |
Answer: a
Explanation: Gain margin of the system is 10.
Explanation: Gain margin of the system is 10.
The forward path transfer function of a unity feedback system is given by G(s) = 100/(s2+10s+100). The frequency response of this system will exhibit the resonance peak at: - a)10 rad/sec
- b)8.66 rad/sec
- c)7.07 rad/sec
- d)5rad/sec
Correct answer is option 'C'. Can you explain this answer?
The forward path transfer function of a unity feedback system is given by G(s) = 100/(s2+10s+100). The frequency response of this system will exhibit the resonance peak at:
a)
10 rad/sec
b)
8.66 rad/sec
c)
7.07 rad/sec
d)
5rad/sec
|
|
Nayanika Kaur answered |
Answer: c
Explanation: G(s) = 100/(s2+10s+100)
wn = 10rad/sec
G = 10/2wn =0.5
wr = 0.707 rad/s.
Explanation: G(s) = 100/(s2+10s+100)
wn = 10rad/sec
G = 10/2wn =0.5
wr = 0.707 rad/s.
In polar plots, if a pole is added at the origin, what would be the value of the magnitude at Ω = 0?- a)Zero
- b)Infinity
- c)Unity
- d)Unpredictable
Correct answer is option 'B'. Can you explain this answer?
In polar plots, if a pole is added at the origin, what would be the value of the magnitude at Ω = 0?
a)
Zero
b)
Infinity
c)
Unity
d)
Unpredictable
|
|
Mainak Pillai answered |
Answer: b
Explanation: Addition of pole causes instability to the system.
Explanation: Addition of pole causes instability to the system.
A system has a single pole at origin. Its impulse response will be:- a)Constant
- b)Ramp
- c)Decaying exponential
- d)Oscillatory
Correct answer is option 'A'. Can you explain this answer?
A system has a single pole at origin. Its impulse response will be:
a)
Constant
b)
Ramp
c)
Decaying exponential
d)
Oscillatory
|
Avik Saha answered |
Answer: a
Explanation: For a single pole at origin the system is of type 1 and impulse response of the system with single pole at the origin will be constant.
Explanation: For a single pole at origin the system is of type 1 and impulse response of the system with single pole at the origin will be constant.
Consider the loop transfer function K(s+6)/(s+3)(s+5) In the root locus diagram the centroid will be located at:- a)-4
- b)-1
- c)-2
- d)-3
Correct answer is option 'C'. Can you explain this answer?
Consider the loop transfer function K(s+6)/(s+3)(s+5) In the root locus diagram the centroid will be located at:
a)
-4
b)
-1
c)
-2
d)
-3
|
|
Prisha Iyer answered |
Answer: c
Explanation: Centroid =Sum of real part of open loop pole-sum of real part of open loop zeros/P-Z
Explanation: Centroid =Sum of real part of open loop pole-sum of real part of open loop zeros/P-Z
The open loop transfer function of the feedback control system is given by G(s) =K(s+3)/s(s+4)2(s+5)(s+6). The number of asymptotes and the centroid of asymptotes of the root loci of closed loop system is - a)4 and (-4,0)
- b)3 and (-12,0)
- c)-4 and (-4,0)
- d)-3 and (-12,0)
Correct answer is option 'A'. Can you explain this answer?
The open loop transfer function of the feedback control system is given by G(s) =K(s+3)/s(s+4)2(s+5)(s+6). The number of asymptotes and the centroid of asymptotes of the root loci of closed loop system is
a)
4 and (-4,0)
b)
3 and (-12,0)
c)
-4 and (-4,0)
d)
-3 and (-12,0)
|
|
Gargi Mishra answered |
Answer: a
Explanation: Number of Poles = 5
Zeroes =1
Asymptotes =P-Z =4
Centroid =Σreal part of open loop pole-Σreal part of open loop zeroes/P-Z
Centroid = -4-4-5-6+3/4 =-4.
Explanation: Number of Poles = 5
Zeroes =1
Asymptotes =P-Z =4
Centroid =Σreal part of open loop pole-Σreal part of open loop zeroes/P-Z
Centroid = -4-4-5-6+3/4 =-4.
Given a unity feedback control system with G (s) = K/s(s+4), the value of K for which the damping ratio is 0.5.- a)1
- b)16
- c)64
- d)32
Correct answer is option 'B'. Can you explain this answer?
Given a unity feedback control system with G (s) = K/s(s+4), the value of K for which the damping ratio is 0.5.
a)
1
b)
16
c)
64
d)
32
|
Anoushka Choudhury answered |
Answer: b
Explanation: The value is found by using the Routh- Hurwitz criteria and equating one of the row of the Routh-Hurwitz criteria equal to zero and hence finding the value of K.
Explanation: The value is found by using the Routh- Hurwitz criteria and equating one of the row of the Routh-Hurwitz criteria equal to zero and hence finding the value of K.
Determine the centroid of the root locus for the system having G(s)H(s) = K/(s+1)(s2+4s+5) - a)-2.1
- b)-1.78
- c)-1.66
- d)-1.06
Correct answer is option 'C'. Can you explain this answer?
Determine the centroid of the root locus for the system having G(s)H(s) = K/(s+1)(s2+4s+5)
a)
-2.1
b)
-1.78
c)
-1.66
d)
-1.06
|
|
Divya Nair answered |
Answer: Roots of the open loop transfer function are -1,-2+j, -2-j then centroid =Σreal part of open loop pole-Σreal part of open loop zeroes/P-Z
Centroid =(-1-2-2)-0/3 =-5/3 =-1.66.
Centroid =(-1-2-2)-0/3 =-5/3 =-1.66.
Which one of the following statements is not correct?- a)Root loci can be used for analyzing stability and transient performance
- b)Root loci provide insight into system stability and performance
- c)Shape of the root locus gives idea of type of controller needed to meet design specification
- d)Root locus can be used to handle more than one variable at a time
Correct answer is option 'D'. Can you explain this answer?
Which one of the following statements is not correct?
a)
Root loci can be used for analyzing stability and transient performance
b)
Root loci provide insight into system stability and performance
c)
Shape of the root locus gives idea of type of controller needed to meet design specification
d)
Root locus can be used to handle more than one variable at a time
|
|
Niharika Basu answered |
Answer: d
Explanation: For more than one variable state space is used.
Explanation: For more than one variable state space is used.
If root loci plots of a particular control system do not intersect the imaginary axis at any point, then the gain margin of the system will be:- a)0
- b)0.707
- c)1
- d)Infinite
Correct answer is option 'D'. Can you explain this answer?
If root loci plots of a particular control system do not intersect the imaginary axis at any point, then the gain margin of the system will be:
a)
0
b)
0.707
c)
1
d)
Infinite
|
|
Megha Datta answered |
Answer: d
Explanation: The gain margin is the inverse of the intersection of the root loci plot to the imaginary axis and if it does not intersect then the gain margin will be infinite.
Explanation: The gain margin is the inverse of the intersection of the root loci plot to the imaginary axis and if it does not intersect then the gain margin will be infinite.
The OLTF of a unity feedback system is K(s+2)(s+4)/(s+5)(s+6) the angle of arrival of the root loci as s =-2, and s =-4 respectively are: - a)0°,180°
- b)180°,0°
- c)90°,180°
- d)180°, 90°
Correct answer is option 'B'. Can you explain this answer?
The OLTF of a unity feedback system is K(s+2)(s+4)/(s+5)(s+6) the angle of arrival of the root loci as s =-2, and s =-4 respectively are:
a)
0°,180°
b)
180°,0°
c)
90°,180°
d)
180°, 90°
|
|
Akanksha Chopra answered |
Answer: b
Explanation: As it is type zero system therefore the angle of arrival can be either 180°, 0°.
Explanation: As it is type zero system therefore the angle of arrival can be either 180°, 0°.
Consider the following statements:
The gain margin and phase margin of an unstable system may respectively be
1. Positive, positive
2. Positive, negative
3. Negative, positive
4. Negative, negative
Of these statements- a)1 and 4 are correct
- b)1 and 2 are correct
- c)1, 2 and 3 are correct
- d)2,3 and 4 are correct
Correct answer is option 'D'. Can you explain this answer?
Consider the following statements:
The gain margin and phase margin of an unstable system may respectively be
1. Positive, positive
2. Positive, negative
3. Negative, positive
4. Negative, negative
Of these statements
The gain margin and phase margin of an unstable system may respectively be
1. Positive, positive
2. Positive, negative
3. Negative, positive
4. Negative, negative
Of these statements
a)
1 and 4 are correct
b)
1 and 2 are correct
c)
1, 2 and 3 are correct
d)
2,3 and 4 are correct
|
|
Sandeep Saha answered |
Answer: d
Explanation: For unstable system the signs of gain margin and phase margin are always different or they can both be negative.
Explanation: For unstable system the signs of gain margin and phase margin are always different or they can both be negative.
Maximum peak overshoot in time domain corresponds to :- a)Resonance peak
- b)Resonant frequency
- c)Bandwidth
- d)Cut-off rate
Correct answer is option 'A'. Can you explain this answer?
Maximum peak overshoot in time domain corresponds to :
a)
Resonance peak
b)
Resonant frequency
c)
Bandwidth
d)
Cut-off rate
|
|
Vaishnavi Singh answered |
Answer: a
Explanation: Resonance peak in frequency domain correspond to maximum peak overshoot in time domain.
Explanation: Resonance peak in frequency domain correspond to maximum peak overshoot in time domain.
Scientist Nyquist have contribution in:- a)Asymptotic plots
- b)Polar plots
- c)Root locus technique
- d)Constant M and n circle
Correct answer is option 'B'. Can you explain this answer?
Scientist Nyquist have contribution in:
a)
Asymptotic plots
b)
Polar plots
c)
Root locus technique
d)
Constant M and n circle
|
|
Sakshi Tiwari answered |
Answer: b
Explanation: Nyquist plot is used to find the stability of the system by open loop poles and zeroes and the encirclements of the poles and zeroes and satisfying the equation N=P-Z and this is named under the name of scientist Nyquist.
Explanation: Nyquist plot is used to find the stability of the system by open loop poles and zeroes and the encirclements of the poles and zeroes and satisfying the equation N=P-Z and this is named under the name of scientist Nyquist.
If a system has an open loop transfer function1-s / 1+s, then the gain of the system at frequency of 1 rad/s will be- a)1
- b)1/2
- c)Zero
- d)-1
Correct answer is option 'D'. Can you explain this answer?
If a system has an open loop transfer function1-s / 1+s, then the gain of the system at frequency of 1 rad/s will be
a)
1
b)
1/2
c)
Zero
d)
-1
|
|
Anoushka Kumar answered |
Answer: d
Explanation: The system is all pass system and the gain of the system at frequency of 1 rad/sec.
Explanation: The system is all pass system and the gain of the system at frequency of 1 rad/sec.
The open loop transfer function of a system is G(s) H(s)= K / (1+s)(1+2s)(1+3s)The phase cross over frequency ωc is- a)V2
- b)1
- c)Zero
- d)V3
Correct answer is option 'B'. Can you explain this answer?
The open loop transfer function of a system is G(s) H(s)= K / (1+s)(1+2s)(1+3s)
The phase cross over frequency ωc is
a)
V2
b)
1
c)
Zero
d)
V3
|
|
Kajal Yadav answered |
Answer: b
Explanation: Phase crossover frequency is calculated as by calculating the magnitude of the transfer function and equating it to 1 and the frequency calculated at this magnitude is phase cross over frequency.
Explanation: Phase crossover frequency is calculated as by calculating the magnitude of the transfer function and equating it to 1 and the frequency calculated at this magnitude is phase cross over frequency.
If the system is represented by G(s) H(s) = k (s+7) / s (s +3) (s + 2), what would be its magnitude at ω = ∞?- a)0
- b)∞
- c)7/10
- d)21
Correct answer is option 'A'. Can you explain this answer?
If the system is represented by G(s) H(s) = k (s+7) / s (s +3) (s + 2), what would be its magnitude at ω = ∞?
a)
0
b)
∞
c)
7/10
d)
21
|
|
Naveen Kapoor answered |
Answer: a
Explanation: On calculating the magnitude of the system and putting the value of frequency one gets the magnitude as 0.
Explanation: On calculating the magnitude of the system and putting the value of frequency one gets the magnitude as 0.
The roots of the characteristic equation of the second order system in which real and imaginary part represents the :- a)Damped frequency and damping
- b)Damping and damped frequency
- c)Natural frequency and damping ratio
- d)Damping ratio and natural frequency
Correct answer is option 'B'. Can you explain this answer?
The roots of the characteristic equation of the second order system in which real and imaginary part represents the :
a)
Damped frequency and damping
b)
Damping and damped frequency
c)
Natural frequency and damping ratio
d)
Damping ratio and natural frequency
|
|
Srishti Choudhary answered |
Answer: b
Explanation: Real part represents the damping and imaginary part damped frequency.
Explanation: Real part represents the damping and imaginary part damped frequency.
A system has poles at 0.01 Hz, 1 Hz and 80Hz, zeroes at 5Hz, 100Hz and 200Hz. The approximate phase of the system response at 20 Hz is : - a)-90°
- b)0°
- c)90°
- d)-180°
Correct answer is option 'A'. Can you explain this answer?
A system has poles at 0.01 Hz, 1 Hz and 80Hz, zeroes at 5Hz, 100Hz and 200Hz. The approximate phase of the system response at 20 Hz is :
a)
-90°
b)
0°
c)
90°
d)
-180°
|
|
Sparsh Nambiar answered |
Explanation: Pole at 0.01 Hz gives -180 degree phase. Zero at 5Hz gives 90 degree phase therefore at 20Hz -90 degree phase shift is provided.
Hence, the correct answer is A.
You can solve more such questions by going through the link:
Nichol’s chart is useful for the detailed study and analysis of:- a)Closed loop frequency response
- b)Open loop frequency response
- c)Close loop and open loop frequency responses
- d)open loop and Close loop frequency responses
Correct answer is option 'A'. Can you explain this answer?
Nichol’s chart is useful for the detailed study and analysis of:
a)
Closed loop frequency response
b)
Open loop frequency response
c)
Close loop and open loop frequency responses
d)
open loop and Close loop frequency responses
|
|
Disha Das answered |
Answer: a
Explanation: Nichol’s chart is useful for the detailed study and analysis of closed loop frequency response.
Explanation: Nichol’s chart is useful for the detailed study and analysis of closed loop frequency response.
The system with the open loop transfer function 1/s(1+s) is:- a)Type 2 and order 1
- b)Type 1 and order 1
- c)Type 0 and order 0
- d)Type 1 and order 2
Correct answer is option 'D'. Can you explain this answer?
The system with the open loop transfer function 1/s(1+s) is:
a)
Type 2 and order 1
b)
Type 1 and order 1
c)
Type 0 and order 0
d)
Type 1 and order 2
|
|
Kajal Yadav answered |
Answer: d
Explanation: Type is defined as the number of poles at origin and order is defined as the total number of poles and this is calculated with the help of the transfer function from the above transfer function the type is 1 and order is 2.
Explanation: Type is defined as the number of poles at origin and order is defined as the total number of poles and this is calculated with the help of the transfer function from the above transfer function the type is 1 and order is 2.
In second order system gain margin is :- a)Zero value
- b)Finite value
- c)Infinite value
- d)None of the mentioned
Correct answer is option 'C'. Can you explain this answer?
In second order system gain margin is :
a)
Zero value
b)
Finite value
c)
Infinite value
d)
None of the mentioned
|
|
Arpita Banerjee answered |
Answer: c
Explanation: Gain margin is defined generally for systems with order greater than 3.
Explanation: Gain margin is defined generally for systems with order greater than 3.
The phase angle of the system G(s) =s+5/s2+4s+9;varies between - a)0° and 90°
- b)0° and -90°
- c)0° and -180°
- d)-90° and -180°
Correct answer is option 'B'. Can you explain this answer?
The phase angle of the system G(s) =s+5/s2+4s+9;varies between
a)
0° and 90°
b)
0° and -90°
c)
0° and -180°
d)
-90° and -180°
|
|
Mihir Chawla answered |
Answer: b
Explanation: Phase = tan−1−11w−w3/45−2.
Explanation: Phase = tan−1−11w−w3/45−2.
Due to an addition of pole at origin, the polar plot gets shifted by ___ at ω = 0 ? - a)-45°
- b)-60°
- c)-90°
- d)-180°
Correct answer is option 'C'. Can you explain this answer?
Due to an addition of pole at origin, the polar plot gets shifted by ___ at ω = 0 ?
a)
-45°
b)
-60°
c)
-90°
d)
-180°
|
|
Abhishek Chauhan answered |
Answer: c
Explanation: Addition of pole causes instability to the system.
Explanation: Addition of pole causes instability to the system.
What is the number of the root locus segments which do not terminate on zeroes?- a)The number of poles
- b)The number of zeroes
- c)The difference between the number of poles and zeroes
- d)The sum of the number of poles and the number of the zeroes
Correct answer is option 'C'. Can you explain this answer?
What is the number of the root locus segments which do not terminate on zeroes?
a)
The number of poles
b)
The number of zeroes
c)
The difference between the number of poles and zeroes
d)
The sum of the number of poles and the number of the zeroes
|
|
Preethi Banerjee answered |
Answer: c
Explanation: The number of the root locus segments which do not lie on the root locus is the difference between the number of the poles and zeroes.
Explanation: The number of the root locus segments which do not lie on the root locus is the difference between the number of the poles and zeroes.
Consider a feedback system with gain margin of about 30. At what point does Nyquist plot crosses negative real axis?- a)-3
- b)-0.3
- c)-30
- d)-0.03
Correct answer is option 'B'. Can you explain this answer?
Consider a feedback system with gain margin of about 30. At what point does Nyquist plot crosses negative real axis?
a)
-3
b)
-0.3
c)
-30
d)
-0.03
|
|
Ritika Mukherjee answered |
Answer: b
Explanation: Gain Margin is always inverse of the point which cuts the Nyquist on the real axis.
Explanation: Gain Margin is always inverse of the point which cuts the Nyquist on the real axis.
The gain margin for the system with open loop transfer functionG(s) H(s) = G(s) =2(1+s) / s2 is- a)8
- b)0
- c)1
- d)-8
Correct answer is option 'B'. Can you explain this answer?
The gain margin for the system with open loop transfer function
G(s) H(s) = G(s) =2(1+s) / s2 is
a)
8
b)
0
c)
1
d)
-8
|
|
Ameya Gupta answered |
Answer: 0
Explanation: Gain margin of a system is calculated at the phase cross over frequency and expressed in decibels.
Explanation: Gain margin of a system is calculated at the phase cross over frequency and expressed in decibels.
Which one of the following statements is correct?Nichol’s chart is useful for the detailed study of:- a)Closed loop frequency response
- b)Open loop frequency response
- c)Close loop and open loop frequency responses
- d)None of the mentioned
Correct answer is option 'A'. Can you explain this answer?
Which one of the following statements is correct?
Nichol’s chart is useful for the detailed study of:
a)
Closed loop frequency response
b)
Open loop frequency response
c)
Close loop and open loop frequency responses
d)
None of the mentioned
|
|
Juhi Joshi answered |
Answer: a
Explanation: Nichol’s chart has constant M and N circles that are used to find the stability of the system and the detailed study of their can be determined with the help of the closed loop frequency response.
Explanation: Nichol’s chart has constant M and N circles that are used to find the stability of the system and the detailed study of their can be determined with the help of the closed loop frequency response.
Laplace transform is used for the systems with:- a)Initial conditions infinite
- b)Initial conditions zero
- c)Initial conditions finite
- d)Initial conditions equal to the initial input
Correct answer is option 'B'. Can you explain this answer?
Laplace transform is used for the systems with:
a)
Initial conditions infinite
b)
Initial conditions zero
c)
Initial conditions finite
d)
Initial conditions equal to the initial input
|
|
Aniket Shah answered |
Answer: b
Explanation: By definition of the transfer function by Laplace transform the initial conditions of the systems are considered to be zero.
Explanation: By definition of the transfer function by Laplace transform the initial conditions of the systems are considered to be zero.
Which one of the following is not the property of root loci?- a)The root locus is symmetrical about imaginary axis
- b)They start from the open loop poles and terminate at the open loop zeroes
- c)The breakaway points are determined from dK/ds = 0
- d)Segments of the real axis are the part of the root locus if and only is the total number of real poles and zeroes to their right is odd.
Correct answer is option 'A'. Can you explain this answer?
Which one of the following is not the property of root loci?
a)
The root locus is symmetrical about imaginary axis
b)
They start from the open loop poles and terminate at the open loop zeroes
c)
The breakaway points are determined from dK/ds = 0
d)
Segments of the real axis are the part of the root locus if and only is the total number of real poles and zeroes to their right is odd.
|
|
Prasenjit Yadav answered |
Answer: a
Explanation: The root locus is the locus traced due to the gain of the system with changing frequency and need not be symmetrical about origin.
Explanation: The root locus is the locus traced due to the gain of the system with changing frequency and need not be symmetrical about origin.
Which of the following is the non-linearity caused by servomotor?- a)Static friction
- b)Backlash
- c)Saturation
- d)None of the mentioned
Correct answer is option 'C'. Can you explain this answer?
Which of the following is the non-linearity caused by servomotor?
a)
Static friction
b)
Backlash
c)
Saturation
d)
None of the mentioned
|
|
Mahesh Singh answered |
Answer: c
Explanation: Linearity in the servo-motor is due to the saturation present and which is the important consideration for any type of the practical device.
Explanation: Linearity in the servo-motor is due to the saturation present and which is the important consideration for any type of the practical device.
Scientist Bode have contribution in :- a)Asymptotic plots
- b)Polar plots
- c)Root locus technique
- d)Constant M and n circle
Correct answer is option 'A'. Can you explain this answer?
Scientist Bode have contribution in :
a)
Asymptotic plots
b)
Polar plots
c)
Root locus technique
d)
Constant M and n circle
|
|
Aashna Dey answered |
Answer: a
Explanation: Asymptotic plots are the bode plots that are drawn to find the relative stability of the system by finding the phase and gain margin and this was invented by Scientist Bode.
Explanation: Asymptotic plots are the bode plots that are drawn to find the relative stability of the system by finding the phase and gain margin and this was invented by Scientist Bode.
Which of the following is an electromechanical device?- a)Induction relay
- b)Thermocouple
- c)LVDT
- d)All of the mentioned
Correct answer is option 'C'. Can you explain this answer?
Which of the following is an electromechanical device?
a)
Induction relay
b)
Thermocouple
c)
LVDT
d)
All of the mentioned
|
|
Jatin Mukherjee answered |
Answer: c
Explanation: LVDT is the electromechanical device which converts the displacement of the core to the electrical energy by the action of the transformer.
Explanation: LVDT is the electromechanical device which converts the displacement of the core to the electrical energy by the action of the transformer.
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