What is the automatic control system?

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asked Mar 10, 2018 by anonymous

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asked Jul 21, 2019 by anonymous

Draw and explain schematic of PLC based automatic car parking barrier system.

Last answer: Explanation: Automatic car parking system allow to park maximum numbers of car in parking zone according to size of parking zone. parking zone number of vehicle parked in parking zone is less ... available parking space then automated parking system does not allow enter next car in parking zone.

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asked Mar 10, 2018 by anonymous

What are the advantages of open loop control system?

Last answer: Open loop control system are simple to design. Open loop control system are generally stable.

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asked Apr 28, 2018 by anonymous

A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the

A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system (A) crosses the real axis at +0.1 (B) crosses the real axis at -0.1. (C) crosses the imaginary axis at -0.1 (D) crosses the imaginary axis at +0.1

Last answer: A unity negative feedback control system is found to have a gain margin of 20 dB. The Nyquist plot of the system crosses the real axis at -0.1.

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97 views 1 answer

asked Apr 30, 2018 by anonymous

A differentiator is not usually used in control system, because it : -

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

Last answer: A differentiator is not usually used in control system, because it : - increases input noise

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58 views 1 answer

asked Jun 28, 2020 by anonymous

Draw the labeled block diagram of process control system and explain each block.

Last answer: Explanation - Process control system consists of process or plant, sensor, error detector, automatic Controller, actuator or control element. 1) Process or plant- process means some manufacturing sequence ... process which changes the process variable. Output of this block is denoted by u .

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136 views 1 answer

asked Apr 26, 2018 by anonymous

Negative feedback in a closed-loop control system DOES NOT

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

Last answer: Negative feedback in a closed-loop control system DOES NOT reduce bandwidth

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119 views 1 answer

asked Mar 10, 2018 by anonymous

What is the difference between a line voltage and low voltage control system?

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asked Jul 4, 2019 by anonymous

What are the disadvantages of Open loop control system?

Last answer: Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.

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56 views 1 answer

asked May 1, 2018 by anonymous

A control system having unit damping factor will give

A control system having unit damping factor will give (1) Oscillatory response (2) Undamped response (3) Critically damped response (4) No response

Last answer: 1

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584 views 2 answers

asked Mar 10, 2018 by anonymous

What is control and automation?

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asked Mar 10, 2018 by anonymous

What are the different types of control systems?

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asked Sep 26, 2017 by anonymous

6.30 Consider the state variable model.

Problem number 6.30 from digital control and state variable methods by M Gopal (second edition)

Last answer: Solution for 6.30

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2.5k views 1 answer

asked Apr 26, 2018 by anonymous

The standard for long distance analog signal transmission in process control industry is

The standard for long distance analog signal transmission in process control industry is (A) 4-20 mV (B) 0-20 mA (C) 4-20 mA (D) 0-5 V

Last answer: The standard for long distance analog signal transmission in process control industry is 4-20 mA

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2.5k views 1 answer

asked Mar 27, 2018 by anonymous

An automatic toaster is a ______ loop control system.

Last answer: An automatic toaster is an open loop control system.

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254 views 1 answer

asked Jun 18, 2018 by anonymous

What will happen to the gain margin if the gain of the open loop system is doubled?

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

Last answer: 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

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145 views 1 answer

asked Jun 18, 2018 by anonymous

What is the time response of a system whose poles lie on the right hand side of s-plane?

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

Last answer: 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

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71 views 1 answer

asked Mar 10, 2018 by anonymous

What is a servomechanism system?

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40 views 0 answers

asked Mar 10, 2018 by anonymous

What is an example of an open loop system?

Last answer: Open loop system. Ex. Electric heater, washing machine, fan, electric switch, etc

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asked Mar 10, 2018 by anonymous

What are some examples of a closed loop system?

Last answer: C.L s/m. EX. Air conditioner (AC), rocket launcher, radar system, voltage stabilizer etc.

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asked Mar 19, 2018 by anonymous

What is a phase control thyristor?

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asked Dec 16, 2017 by anonymous

What is HT and LT control panels?

Last answer: HT Panel is like LT Panel except that it is used for high tension cables. LT Panels :LT Panel is an electrical distribution board that receives power from generator or transformer and distributes the same to various electronic devices and distribution boards.

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82 views 1 answer

asked Mar 10, 2018 by anonymous

What are the electromagnetic waves used in remote control?

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asked Dec 16, 2017 by anonymous

What are the speed control methods of dc motor?

Last answer: Field control of DC motor Armature control of DC motor

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asked May 8, 2018 by anonymous

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

Last answer: Given a unity feedback system with G(s)=k/s (s+4), the value of k for damping ratio of 0.5 is 16

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270 views 1 answer

asked Apr 30, 2018 by anonymous

Phase margin is the amount of angle to make the system

Phase margin is the amount of angle to make the system (1) Oscillatory (2) Stable (3) Unstable (4) Exponential

Last answer: Phase margin is the amount of angle to make the system Unstable

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138 views 1 answer

asked Apr 30, 2018 by anonymous

If the gain of the open loop system is doubled, the gain margin

If the gain of the open loop system is doubled, the gain margin (1) Is not affected (2) Gets doubled (3) Becomes half (4) Becomes one -forth

Last answer: If the gain of the open loop system is doubled, the gain margin Becomes half

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347 views 1 answer

asked Apr 28, 2018 by anonymous

In Torque-Voltage analogy, the Moment of Inertia of a mechanical rotational system is analogous to

In Torque-Voltage analogy, the Moment of Inertia of a mechanical rotational system is analogous to (A) Capacitance C. (B) Inductance L. (C) Resistance R. (D) Inductive reactance XL

Last answer: In Torque-Voltage analogy, the Moment of Inertia of a mechanical rotational system is analogous to Inductance L.

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308 views 1 answer

asked Apr 26, 2018 by anonymous

The damping factor of a particular system is unity, the system response will be

Last answer: The damping factor of a particular system is unity, the system response will be critically damped

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170 views 1 answer

asked May 3, 2018 by anonymous

A system is linear if and only if it satisfies

Last answer: A system is linear if and only if it satisfies principle of superposition and principle of homogeneity

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69 views 1 answer

asked Apr 28, 2018 by anonymous

Observability of a system is essential for

Observability of a system is essential for (A) finding a solution to the state equation. (B) finding a suitable model in state space. (C) transferring the state of the system from any initial value to any specified final value. (D) state estimation.

Last answer: Observability of a system is essential for state estimation.

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46 views 1 answer

asked Apr 26, 2018 by anonymous

Consider a continuous-time system with input x(t) & output y(t) are related by y(t) = x (sin t). This system is

Consider a continuous-time system with input x(t) & output y(t) are related by y(t) = x (sin t). This system is (A) causal & linear (B) non-causal & linear (C) causal & non-linear (D) non-causal & non-linear

Last answer: Consider a continuous-time system with input x(t) & output y(t) are related by y(t) = x (sin t). This system is non-causal & linear

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163 views 1 answer

asked May 1, 2018 by anonymous

How can the steady-state error in a system be reduced?

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

Last answer: 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

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173 views 1 answer

asked Apr 26, 2018 by anonymous

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

Last answer: lf the poles of system are lying on the imaginary axis in s-plane, then the system will be marginally stable

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70 views 1 answer

asked Apr 26, 2018 by anonymous

The steady state error of the system can be minimized by

Last answer: The steady state error of the system can be minimized by increasing gain k

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80 views 1 answer

asked Jul 21, 2019 by anonymous

Draw block diagram of pneumatic system showing its basic components. State the functions of control value and air actuator.

Last answer: Diagram : Control valve: - control and regulates the direction of flow and pressure etc. Air actuator: - Air cylinders and motors are used to obtain the required movements of direction flow.

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443 views 1 answer

asked Sep 22, 2018 by anonymous

Describe the following energy conservation methods of lighting system. i) By replacing lamp sources ii) Using light control gears.

Last answer: Energy conservation methods of lighting system: i) By replacing lamp sources: Installation of energy efficient fluorescent lamps in place of Conventional fluorescent lamps. Installation of ... (HF) electronic ballasts in place of conventional ballasts which saves energy up to 35%.

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76 views 1 answer

asked Apr 28, 2018 by anonymous

A second order system shows 100% overshoot in its unit step response. It can be categorized as

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.

Last answer: A second order system shows 100% overshoot in its unit step response. It can be categorized as undamped system.

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49 views 1 answer

asked May 1, 2018 by anonymous

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above

Last answer: The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases

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118 views 1 answer

asked Apr 28, 2018 by anonymous

The meter which does not have any component in it to provide control torque is

The meter which does not have any component in it to provide control torque is (A) Electrodynamometer for current measurement (B) Electrodynamometer for voltage measurement (C) Electrodynamometer for power measurement. (D) Electrodynamometer for power factor measurement.

Last answer: The meter which does not have any component in it to provide control torque is Electrodynamometer for power factor measurement.

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118 views 1 answer

asked Mar 20, 2018 by anonymous

The main disadvantage of the Ward-Leonard control method is?

Last answer: The main disadvantage of the Ward-Leonard control method is high initial cost, high maintenance cost, low efficiency at light loads.

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58 views 1 answer

asked Mar 20, 2018 by anonymous

In Ward-Leonard control the lower limit of speed is imposed by?

Last answer: In Ward-Leonard control the lower limit of speed is imposed by residual magnetism of the generator.

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61 views 1 answer

asked Mar 20, 2018 by anonymous

The speed control of universal motor used for sewing machines is by?

Last answer: The speed control of universal motor used for sewing machines is by varying the resistance.

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70 views 1 answer

asked Aug 31, 2018 by anonymous

Quality control is aimed at:

Quality control is aimed at: a. Maintaining the desired quality b. Exceeding the desired quality c. Continuously improving the quality d. Following the quality

Last answer: Quality control is aimed at: a. Maintaining the desired quality b. Exceeding the desired quality c. Continuously improving the quality d. Following the quality

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67 views 1 answer

asked Mar 20, 2018 by anonymous

For constant torque drive which speed control method is preferred ?

Last answer: For constant torque drive armature voltage control speed control method is preferred.

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asked Mar 20, 2018 by anonymous

Ward-Leonard control is basically a?

Last answer: Ward-Leonard control is basically a voltage control method.

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34 views 1 answer

asked Mar 20, 2018 by anonymous

Usually wide and sensitive speed control is desired in case of?

Last answer: Usually wide and sensitive speed control is desired in case of colliery winders.

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107 views 1 answer

asked Mar 20, 2018 by anonymous

Speed control of a universal motor is achieved by?

Last answer: Speed control of a universal motor is achieved by varying field flux with tapped field windings, connecting rheostat in series, applying variable voltage by means of silicon controlled rectifier, applying variable voltage by means of variable auto-transformer.

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77 views 1 answer

asked May 3, 2020 by anonymous

Describe control of a single lamp from three places. Draw the relevant circuit diagram.

Last answer: Single lamp control from three places- It consists of two way switches & intermediate switch, the circuit diagram is as shown in figure. We require two 2-way switches and one intermediate switch and a lamp ... position of any one switch is changed, then the lamp will be turned off.

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89 views 1 answer

asked May 3, 2020 by anonymous

State the purpose of lighting control. List the different types of dimmer.

Last answer: Purpose of Lighting Control:- 1. To turn ON or OFF the lamps 2. For dimming: The dimming control permits the adjustment of lighting over a range. 3. For changing the lighting levels ... operated dimmer 6) Triac operated Dimmer 7) PWM (Pulse width modulation) Controlled technique.

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66 views 1 answer

asked Oct 13, 2019 by anonymous

Speed control of the motor using TRIAC

Last answer: Speed control of the motor using TRIAC: This basic phase triggering circuit uses the triac in series with the motor across an AC sinusoidal supply. The variable resistor, VR1 is used ... meaning that it may not trigger at the exact same point for each positive and negative half cycle.

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209 views 1 answer

What is the automatic control system?

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