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What is the back EMF of a dc motor?

Recent questions and answers in Control System

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What are the advantages of open loop control system?

answered Jul 4 in Control System
1 answer 42 views

What is Mason's gain formula?

answered Apr 3 in Control System
3 answers 62 views

The open loop control system is one in which _____.

answered Oct 4, 2018 in Control System
1 answer 36 views

What are some examples of a closed loop system?

answered Sep 15, 2018 in Control System
1 answer 31 views

What is an example of an open loop system?

answered Sep 15, 2018 in Control System
2 answers 40 views

what is open loop and close loop control system?

answered Sep 15, 2018 in Control System
2 answers 27 views

With negative feedback, the system stability and system gain respectively (a) Increases and increases (b) Increases and decreases (c) Decreases and increases (d) Decreases and decreases

answered Sep 5, 2018 in Control System
1 answer 23 views

The effect of negative feedback on distortion and bandwidth is A) Both distortion and bandwidth get decreased B) Both distortion and bandwidth get increased C) Distortion is reduced and bandwidth is increased D) Distortion is increased and bandwidth is decreased 

answered Jun 18, 2018 in Control System
1 answer 37 views

What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth 

answered Jun 18, 2018 in Control System
1 answer 27 views

What is the time response of a system whose poles lie on the right hand side of s-plane? A) Exponentially increasing B) Exponentially decreasing C) Sinusoidal oscillations D) Step response 

answered Jun 18, 2018 in Control System
1 answer 9 views

What is the steady state error of type-0 system for ramp input?  A) ∞ B) A/K C) A/(1+K) D) 0

answered Jun 18, 2018 in Control System
1 answer 84 views

A system is critically damped. If the gain of the system is increased, the system will behave as: A) overdamped B) underdamped C) oscillatory D) critically damped

answered Jun 17, 2018 in Control System
0 answers 24 views

A lag-lead compensator for a second order system (A) improves steady state errors, reduces relative stability (B) marginally improves steady state errors, increases relative stability (C) reduces steady state errors, increases relative stability (D) improves both transient response and steady state response 

asked Jun 4, 2018 in Control System
1 answer 10 views

A PD controller is used to compensate a system. Compared to the uncompensated system, the compensated system has: (1) A higher type number. (2) Reduced damping. (3) Higher noise amplification. (4) Larger transient overshoot. 

answered May 29, 2018 in Control System
1 answer 13 views

Which one most appropriate dynamic system? (1) y(n) + y(n – 1) + y(n + 1) (2) y(n) + y(n – 1) (3) y(n) = x(n) (4) y(n) + y(n – 1) + y(n + 3) = 0 

answered May 28, 2018 in Control System
0 answers 15 views

Synchros in control systems are used as (a) error detectors (b) encoders (c) both (a) and (b) (d) none of these

asked May 25, 2018 in Control System
0 answers 13 views

For a desirable transient response of a second order system, the damping ratio must be between (a) 0.4 and 0.8 (b) 0.8 and 1.0 (c) 0.3 and 0.5 (d) 0.2 and 0.4

asked May 25, 2018 in Control System
0 answers 13 views

In a control system, the comparator measures the difference between (a) output and input (b) output of controller and system (c) actual and desired performance (d) input and error signal  

asked May 25, 2018 in Control System
0 answers 27 views

The best method for determining the stability and transient response of a control system is (a) Bode Plot (b) Nyquist plot (c) Root locus (d) Routh-Hurwitz

asked May 25, 2018 in Control System
0 answers 693 views

A system with gain margin close to unity or a phase margin close to zero is (a) conditionally stable (b) relatively stable (c) highly stable (d) highly oscillatory

asked May 25, 2018 in Control System
0 answers 12 views

In force-current analogy, analogous of displacement is (a) charge (b) flux linkage (c) voltage (d) current density 

asked May 25, 2018 in Control System
0 answers 14 views

By increasing the gain ‘k’ of a system, steady state error of the system (a) increases (b) decreases (c) remains unaffected (d) nothing can be said 

asked May 25, 2018 in Control System
0 answers 15 views

The sensitivity of a closed loop system to gain changes and load disturbances depends upon (a) forward gain (b) loop gain (c) frequency (d) all the above 

asked May 25, 2018 in Control System
1 answer 10 views

In a closed loop control system  (a) control action depends upon the output and also on the input command (b) output signal is fed back to be compared with the reference signal (c) the accuracy is better than in the open loop system (d) all of the above

answered May 25, 2018 in Control System
1 answer 10 views

Companding is a technique used to achieve: -  a) uniform quantization b) delta modulation c) non uniform quantization d) differential quantization

answered May 23, 2018 in Control System
1 answer 55 views

For a stable feedback control system, the phase margin is  a) always positive b) always negative c) may be positive or negative d) always greater than 180o

answered May 23, 2018 in Control System
1 answer 14 views

In root locus plot, a point on the real axis lies on the locus, if the number of open loop poles plus zeros on real axis to the a) left of the point is odd b) left of the point is even . c) right of the pointis odd d) right of the point is even

answered May 23, 2018 in Control System
1 answer 14 views

Introduction of integral action in the forward path of a unity feedback system results in a  A) Marginally stable system B) System with no steady state error C) System with increased stability margin D) System With better speed of response

answered May 20, 2018 in Control System
1 answer 19 views

For a feedback control system of type 2, the steady error for a rap input is  A) Infinite B) Constant C) Zero D) Indeterminate

answered May 20, 2018 in Control System
1 answer 8 views

The correct sequence of steps required to improve system stability is  (A) Insert derivative action, use negative feedback, reduce gain (B) Reduce gain, use negative feedback, insert derivative action (C) Reduce gain, insert derivative action, use negative feedback (D) Use negative feedback, reduce gain, insert derivative action

answered May 17, 2018 in Control System
1 answer 12 views

The driving point impedance with poles at ω = 0(zero) and ω = ∞ (infinity) must have the  (a) s term in the denominator and an excess term in the numerator (b) s term in the numerator and an excess term in the denominator (c) s term in the numerator and equal number of terms in the numerator and denominator (d) s term in the denominator and equal number of terms in the numerator and denominator

answered May 16, 2018 in Control System
1 answer 10 views

For a 2nd order feedback control system, the peak resonance magnitude should be Mp ≤ 1.15. Hence the damping ratio (δ) is  (a) 0.1 (d) 0.5 (c) 0.707 (d) 1

answered May 15, 2018 in Control System
1 answer 23 views

The characteristic equation for a closed loop system with forward gain K is s4 + 4s3 + 8s2 + 6s + K = 0. The critical gain value Kc for stability should not exceed  (a) 3.25 (b) 9.75 (c) 13.0 (d) 23.3

answered May 15, 2018 in Control System
1 answer 101 views

The loop transfer of a system is G(s) H(s) = 5/(s+1) (2s+1)(3s+1) which has the phase crossover frequency fc = 0.16 Hz. The gain margin (dB) of the system is  (a) 6 (b) 4 (c) 2 (d) 0

answered May 15, 2018 in Control System
1 answer 13 views

For a 2nd order servo system, the damping ratio δ = 0.5456 and undamped natural frequency is ωn = 31.6 rad/sec. The percent overshoot is  (a) 7.07 (b) 10.2 (c) 14.10 (d) 21.21

answered May 15, 2018 in Control System
1 answer 7 views

For a system with derivative feedback, forward path transfer is G(s) = I / (s2 + s + 1) and feedback path transfer is H(s) = Ks. What is the value of K to obtain a critically-damped closed loop transient response.  (a) 0.5 (b) 0.707 (c) 1 (d) 1.414

answered May 15, 2018 in Control System
1 answer 8 views

In lag compensator the damping ratio, gain and steady state error (ess) are   (a) Decreases, Decreases and Increases (b) Decreases, Increases and Increases (c) Increases, Increases and Decreases (d) Increases, Decreases and Decreases

answered May 13, 2018 in Control System
1 answer 12 views

The critical point lies within the nyquist plot then the system is   (a) Marginally stable (b) Unstable (c) Stable (d) Undetermined  

answered May 13, 2018 in Control System
1 answer 20 views

The gain margin of a system is 0 dB. It represents a   (a) Stable system (b) Unstable system (c) Marginally stable system (d) Conditionally stable system

answered May 13, 2018 in Control System
1 answer 14 views

Order of the open loop transfer function is _____ to order of closed loop transfer function   (a) not equal (b) equal (c) less than (d) greater than 

answered May 13, 2018 in Control System
1 answer 11 views

Poles are real and negative and equal then the system is _____ damped system   (a) Undamped (b) Underdamped (c) Critically damped (d) Overdamped

answered May 13, 2018 in Control System
1 answer 80 views

For the minimum phase system, which of these is the most appropriate one ?  (A) All poles are inside the unit circle in the z-plane  (B) All zeros are inside the unit circle in the z-plane  (C) All poles and zeros are inside the unit circle in the z-plane  (D) All poles and zeros are outside the unit circle in the z-plane

answered May 12, 2018 in Control System
1 answer 20 views

An absolutely integrable signal x(t) is known to have a pole at s = 2. Which one of the following is true ? (A) B, C and D are true (B) x(t) can be left-sided (C) x(t) can be right-sided (D) x(t) can be both-sided

answered May 12, 2018 in Control System
1 answer 8 views

If x(t) is of finite duration and absolutely integrable, the ROC of its Laplace Transform X(s) is (A) Left half-plane (B) Entire s-plane (C) Right half-plane (D) Finite duration plane

answered May 12, 2018 in Control System
1 answer 9 views

Let x1(t) and x2(t) be periodic with fundamental periods T1 and T2 respectively. Under what condition be the sum x(t) = x1(t) + x2(t) be periodic ? (A) Only for T1 = T2 (B) Always periodic (C) For T1/T2 equal to a rational number (D) Not periodic

answered May 12, 2018 in Control System
1 answer 19 views

Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is

answered May 8, 2018 in Control System
1 answer 19 views

A system is linear if and only if it satisfies

answered May 3, 2018 in Control System
1 answer 25 views

A transfer function has a second order denominator and constant gain in the numerator

answered May 3, 2018 in Control System
1 answer 36 views

How can the steady-state error in a system be reduced?  (1) By decreasing the type of system (2) By increasing system gain (3) By decreasing the static error constant (4) By increasing the input

answered May 1, 2018 in Control System
1 answer 308 views

In order to regulate steady state error to zero, in a negative feedback control system, one employs

answered May 1, 2018 in Control System
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