# In a closed-loop system in which the output is the speed of a motor, the output rate control can be used to_________.

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In a closed-loop system in which the output is the speed of a motor, the output rate control can be used to limit the acceleration of the motor.

## Related questions

In closed loop control system, with positive value of feedback gain the overall gain of the system will

Negative feedback in a closed-loop control system DOES NOT (A) reduce the overall gain (B) reduce bandwidth (C) improve disturbance rejection (D) reduce sensitivity to parameter variation

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

After drawing the Root-Locus, the closed-loop poles corresponding to a specified value of gain K can be determined from which of the following criterion ? (A) Magnitude criterion alone (B) Angle criterion alone (C) Both Magnitude and Angle criteria (D) Angle of departure and angle of arrival.

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

The open loop control system is one in which _____.

The output of a feedback control system must be a function of?

In a control system the output of the controller is given to?

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

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

What are some examples of a closed loop system?

For applications requiring speed ratio other than 2 : 1, the speed control of an induction motor can be effected by varying the number of stator poles employing  (1) multiple stator winding (2) pole amplitude modulation technique (3) consequent pole technique (4) Any of these

_____is a closed loop system.

An electromechanical closed –loop control system has the transfer function C(s)/R(s) = k/s (s2 + s +1) (s+ 4) +k. Which one of the following is correct?  (A) The system is stable for all positive values of k (B) The system is unstable for all values of k (C) The system is stable for values of k between zero and 3.36 (D) The system is stable for values of k between 1.6 and 2.45

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

The widely used series-parallel system of speed control of d.c. series motors in traction work gives a speed range of about (a) 1 : 2 (b) 1 : 3 (c) 1 : 4 (d) 1 : 6

An automatic toaster is a ______ loop control system.

Open loop control system is one in which the control action :  a) Depends on the input signal b) Is independent of the desired output c) Depends on system variables d) Depends on system size

An open-loop system is better than a closed-loop system in terms of   (a) Accuracy (b) Stability (c) Noise reduction (d) Sensitivity

What are the advantages of open loop control system?

Whether a given point in the S-plane lies on the Root Locus of a system can be determined by (A) Magnitude criterion (B) Angle Criterion (C) Both Magnitude and Angle Criteria (D) Break-in and Break-away Criteria

A differentiator is not usually used in control system, because it : - (A) reduces damping  (B) increases error  (C) reduces gain margin  (D) increases input noise

If the characteristics equation of a closed loop system is s2+2s+2=0, then the system is  (A) Over damped (B) Critically damped (C) Under damped (D) Undamped

The method of speed control used for increasing the speed of a dc shunt motor above its rated speed is  1) armature resistance control 2) field control (3) armature voltage control (4) series parallel control

Which of the following permutation can be obtained in the output (in the same order) using a stack assuming that the input is the sequence 1, 2, 3, 4, 5 in that order?  (1) 3, 4, 5, 1, 2 (2) 3, 4, 5, 2, 1 (3) 1, 5, 2, 3, 4 (4) 5, 4, 3, 1, 2

In a 3-phase voltage source inverter used for speed control of induction motor, anti-parallel diodes are used across each switching device. The main purpose of diodes is to:

what is open loop and close loop control system?

Which of the following instrument can be used for measuring speed of an aeroplane ? (A) orifice plate (B) hot wire anemometer (C) rotameter (D) pitot tube

The chief advantage of Ward-Leonard system D.C. motor speed control is that is  1. Can be used even for small motors 2. has high overall efficiency at all speeds 3. Gives smooth, sensitive and wide speed control 4. Uses a flywheel to reduce fluctuations in power demand

The first order control system, which is well designed, has a?

For a closed loop controlled d.c. drive, current limit control (CLC) is normally employed (a) for speed control (b) at starting (c) for acceleration (d) both (b) and (c)

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

_____is an open loop control system.

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

For a feedback amplifier, if the loop gain is much greater than unity, the closed loop gain will be equal to

For a 1.8o, 2-phase bipolar stepper motor, the stepping rate is 100 steps/second. The rotational speed of the motor in rpm is  (A) 15 (B) 30 (C) 60 (D) 90

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

A second order system shows 100% overshoot in its unit step response. It can be categorized as (A) underdamped system. (B) overdamped system. (C) Critically damped system. (D) undamped system.

The speed of a D.C. motor can be controlled by varying  1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

The closed loop gain of an OPAMP is dependent upon, whether the OP AMP is used : -  a) in inverting mode b) in non -inverting mode c) is independent of the fact whether the input is connected to inverting or non -inverting terminal d) is depending upon the fact whether the input is connected to inverting or non -inverting terminal

As compared to a closed loop system an open loop system is  (a) more stable as well as more accurate (b) less stable as well as less accurate (c) more stable but less accurate (d) less stable but more accurate