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Basics of Control System & Transfer Function MCQs for Electrical Engineering (EE) Exam
It covers all Important Questions with answers on Basics of Control System & Transfer Function for the Electrical Engineering (EE) exam. The questions are based on important topics. Details about the questions:- Topic: Basics of Control System & Transfer Function
- Type of Questions: MCQs with solutions
- Number of Questions: 50
- You can attempt them on EduRev to score high in Electrical Engineering (EE) exam.
Can you explain the answer of this question below:
The sum of the gains of the feedback paths in the signal flow graph shown in fig. is
A: af + be + cd
B: af + be + cd+abef + bcdeC: af + be + cd + abef + abcdefD: af + be + cd + cbef + bcde + abcdefThe answer is a.
 | Phanindra Varma N answered |
Answer is B because ut can form only individual loop gains
The block diagram of a system is shown in fig.The closed loop transfer function of this system is
a)
b) 
c) 
d) 
Correct answer is 'D'. Can you explain this answer?
a)
b)
c)
d)
Correct answer is 'D'. Can you explain this answer?
 | Nitya Ahuja answered |
Consider the block diagram as SFG. There are two feedback loop -G1G2H1 and -G2G3H2 and one forward path G1G2 G3 . So (D) is correct option.
The gain C(s)/R(s) of the signal flow graph shown in fig.
- a)
- b)
- c)
- d)
Correct answer is option 'B'. Can you explain this answer?
The gain C(s)/R(s) of the signal flow graph shown in fig.
a)
b)
c)
d)
 | Pie Academy answered |
X1 = 1 - H1
X2 = (G1 + G3) X1 - X3H1
X3 = X2G2 + G4
Linear system obeys- a)reciprocity theorem
- b)principle of maximum power transfer
- c)both (a) and (b)
- d)none of the above
Correct answer is option 'C'. Can you explain this answer?
Linear system obeys
a)
reciprocity theorem
b)
principle of maximum power transfer
c)
both (a) and (b)
d)
none of the above
| | Sanvi Kapoor answered |
Linear system obeys both reciprocity theorem and principle of maximum power transfer.
For the signal flow graph shown in fig. an equivalent graph is
- a)
- b)
- c)
- d)
Correct answer is option 'C'. Can you explain this answer?
For the signal flow graph shown in fig. an equivalent graph is
a)
b)
c)
d)
 | Aim It Academy answered |
While writing the transfer function of this signal flow graph,
e2= tae1 + tbe1 = (ta+ tb) e1
Then, signal flow graph will lokk like this:
In the signal flow graph of figure y/x equalsa) 3b) 2c) 5/2d) None of the aboveCorrect answer is option 'B'. Can you explain this answer?
 | Aditya Deshmukh answered |
The answer is b.
P1 = 5 x 2 x 1 = 10
P1 = 5 x 2 x 1 = 10
L1 = - 4
Y/X = 10/1-(-4) = 2
For the system shown in fig. transfer function C(s) R(s) is
- a)
- b)
- c)
- d)
Correct answer is option 'B'. Can you explain this answer?
For the system shown in fig. transfer function C(s) R(s) is
a)
b)
c)
d)
 | Gate Gurus answered |
Consider the block diagram as a SFG. Two forward path G1G2 and G3 and three loops -G1G2 H2, -G2H1, -G3 H2
There are no nontouching loop. So (B) is correct.
There are no nontouching loop. So (B) is correct.
For the block diagram shown in fig. the numerator of transfer function is
- a)
- b)
- c)
- d)none of these
Correct answer is option 'A'. Can you explain this answer?
For the block diagram shown in fig. the numerator of transfer function is
a)
b)
c)
d)
none of these
 | Zoya Sharma answered |
SFG
P1 = G2G5G6 , P2 = G3G5G6, P3 = G3G6 , P4 = G4G6
If any path is deleted, there would not be any loop.
Hence Δ1 = Δ2 = Δ3 = Δ4 = 1
P1 = G2G5G6 , P2 = G3G5G6, P3 = G3G6 , P4 = G4G6
If any path is deleted, there would not be any loop.
Hence Δ1 = Δ2 = Δ3 = Δ4 = 1
The principle of homogeneity and superposition are applied to:a)Linear time variant systemsb)Nonlinear time invariant systemsc)Linear time invariant systemsd)Nonlinear time invariant systemsCorrect answer is 'C'. Can you explain this answer?
| | Aditya Deshmukh answered |
Superposition theorem states that for two signals, additive and homogeneity property must be satisfied and that is applicable for the Linear time variant (LTI) systems.
As compared to a closed loop system, an open loop system is- a)more stable but less accurate
- b)less stable as well as less accurate
- c)more stable as well as more accurate
- d)less stable but more accurate
Correct answer is option 'A'. Can you explain this answer?
As compared to a closed loop system, an open loop system is
a)
more stable but less accurate
b)
less stable as well as less accurate
c)
more stable as well as more accurate
d)
less stable but more accurate
| | Sanvi Kapoor answered |
As compared to closed loop system an open loop control system is more stable as all its roots are in left half of s plane only, but it less accurate since there is no feedback to measure the output value and compare it with the input value.
The output of the feedback control system must be a function of:- a)Reference input
- b)Reference output
- c)Output and feedback signal
- d)Input and feedback signal
Correct answer is option 'D'. Can you explain this answer?
The output of the feedback control system must be a function of:
a)
Reference input
b)
Reference output
c)
Output and feedback signal
d)
Input and feedback signal
| | Athira Reddy answered |
Explanation: In a feedback control system, the output is determined by a combination of the input signal and the feedback signal. The input signal is the desired output or reference, while the feedback signal is a portion of the actual output that is fed back into the system to compare with the input. This comparison helps the system to adjust its output to minimize the error between the input and the actual output. By considering both the input and feedback signals, the system can continuously adapt and achieve the desired output.
Assertion (A): If the number of zeros are less than the number of poles (i.e. Z < P), we say that there are zeros at infinity and the order of such zeros is P-Z
Reason (R): The value of the transfer function becomes zero for s tends to zero.- a)Both A and R are true and R is a correct explanation of A.
- b)Both A and R are true but R is not a correct explanation of A.
- c)A is true but R is false.
- d)A is false but R is true.
Correct answer is option 'C'. Can you explain this answer?
Assertion (A): If the number of zeros are less than the number of poles (i.e. Z < P), we say that there are zeros at infinity and the order of such zeros is P-Z
Reason (R): The value of the transfer function becomes zero for s tends to zero.
Reason (R): The value of the transfer function becomes zero for s tends to zero.
a)
Both A and R are true and R is a correct explanation of A.
b)
Both A and R are true but R is not a correct explanation of A.
c)
A is true but R is false.
d)
A is false but R is true.
 | Uday Kumar answered |
For Z < P,
∴ Here, number of zeros = 1 and no. of poles = 2
∴ P - Z = 1
When s →∞, transfer function becomes zero. Thus, there is one zero (P - Z = 1) at infinity. Thus, assertion is true.
Since value of transfer function becomes zero as s →∞ therefore, reason is false.
∴ Here, number of zeros = 1 and no. of poles = 2
∴ P - Z = 1
When s →∞, transfer function becomes zero. Thus, there is one zero (P - Z = 1) at infinity. Thus, assertion is true.
Since value of transfer function becomes zero as s →∞ therefore, reason is false.
Consider the List I and List II
The correct match is- a)2 1 3 4
- b)2 1 4 3
- c)1 2 4 3
- d)1 2 3 4
Correct answer is option 'B'. Can you explain this answer?
Consider the List I and List II
The correct match is
a)
2 1 3 4
b)
2 1 4 3
c)
1 2 4 3
d)
1 2 3 4
 | Om Pillai answered |
P. P1 = ab, Δ = 1, L = 0 ,T = ab
Q1 P1 = a, P2 = 6 , Δ = 1, L = Δk = 0,T = a+b
R. P1 = a, L1 = b, Δ = 1 - b, Δ1 =1,
S. P1 = a, L1 = ab, Δ = 1 - ab, Δ1 = 1,
Q1 P1 = a, P2 = 6 , Δ = 1, L = Δk = 0,T = a+b
R. P1 = a, L1 = b, Δ = 1 - b, Δ1 =1,
S. P1 = a, L1 = ab, Δ = 1 - ab, Δ1 = 1,
The negative feedback closed-loop system was subjected to 15V. The system has a forward gain of 2 and a feedback gain of 0.5. Determine the output voltage and the error voltage.- a)15V, 10V
- b)6V, 5V
- c)15V, 7.5V
- d)5V, 10V
Correct answer is option 'C'. Can you explain this answer?
The negative feedback closed-loop system was subjected to 15V. The system has a forward gain of 2 and a feedback gain of 0.5. Determine the output voltage and the error voltage.
a)
15V, 10V
b)
6V, 5V
c)
15V, 7.5V
d)
5V, 10V
 | Starcoders answered |
The negative feedback closed-loop system, subjected to 15V, has a forward gain of 2 and a feedback gain of 0.5.
- The output voltage is calculated as the product of the forward gain and the effective input voltage.
- The effective input voltage is the difference between the input voltage and the feedback voltage.
To find the output voltage:
- Calculate the feedback voltage: Output Voltage multiplied by Feedback Gain.
- Effective input = Input voltage - Feedback voltage.
- Output voltage = Forward gain x Effective input voltage.
After solving, the output voltage is 15V and the error voltage is 7.5V.
Assertion (A): Closed loop control systems are known as feedback control systems.
Reason (R): In closed loop control systems, the control action is dependent on the desired output.- a)Both A and R are true and R is a correct explanation of A.
- b)Both A and R are true but R is not a correct explanation of A.
- c)A is true but R is false.
- d)A is false but R is true.
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): Closed loop control systems are known as feedback control systems.
Reason (R): In closed loop control systems, the control action is dependent on the desired output.
Reason (R): In closed loop control systems, the control action is dependent on the desired output.
a)
Both A and R are true and R is a correct explanation of A.
b)
Both A and R are true but R is not a correct explanation of A.
c)
A is true but R is false.
d)
A is false but R is true.
| | Sanvi Kapoor answered |
- In closed loop system there is the presence of a feedback path and this feedback path has connected from output of the system to the input of the system.
- The whole operation is controlled by the output of the system.
The transfer function of the system shown in fig. is
- a)
- b)
- c)
- d)
Correct answer is option 'C'. Can you explain this answer?
The transfer function of the system shown in fig. is
a)
b)
c)
d)
 | SAI VENKAT answered |
Convert it into signal flow graph. U will get it
Assuming zero initial condition, the response y(t) of the system given below to a unit step input u(t) is
- a)u(t)
- b)t.u(t)
- c)t2/2.u(t)
- d)e-tu(t)
Correct answer is option 'B'. Can you explain this answer?
Assuming zero initial condition, the response y(t) of the system given below to a unit step input u(t) is
a)
u(t)
b)
t.u(t)
c)
t2/2.u(t)
d)
e-tu(t)
 | Luminary Institute answered |
Laplace transform of u(t) is given by
Taking Inverse Laplace transform
y(t) = t.u(t)
The most commonly used input signal(s) in control system is/are- a)ramp or velocity function
- b)step function
- c)accelerating function
- d)all of the above
Correct answer is option 'B'. Can you explain this answer?
The most commonly used input signal(s) in control system is/are
a)
ramp or velocity function
b)
step function
c)
accelerating function
d)
all of the above
| | Sarita Yadav answered |
A step function is commonly used as a input signal in a control system because:
- IF we go through first order system, here we calculate steady-state error by providing input function then we got zero steady-state error.
- Actually in step function, output follows input always that means steady error is minimum.
For the system shown in the figure, Y(s)/X(s) = _________. (Answer in integer )
Correct answer is between '0.95,1.05'. Can you explain this answer?
For the system shown in the figure, Y(s)/X(s) = _________. (Answer in integer )
 | Cstoppers Instructors answered |
The circuit is redrawn as shown:
[X(s) – Y(s)] G(s) + X(s) = Y(s)
Given G(s) = 2
(X(s) – Y(s)) 2 + X(s) = Y(s)
= 2 X(s) + X(s) = Y(s) + 2Y(s)
= 3 X(s) = 3 Y(s)
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