ANSWER: d. All of these . What determines the success of any change, however, is how a change is managed. The principal internal functions of an electromechanical relay are: 1. 2. Temperature, resistance, reactance c. Voltage and current d. All of these View Answer / Hide Answer. Relays are used for isolating a low voltage circuit from high voltage circuit. Time delay can be added to this type of relay by means of a bellows, dashpot, or a clockwork … D. All of the above. The Azure Relay service facilitates your hybrid applications by helping you more securely expose services that reside within a corporate enterprise network to the public cloud. Peak Switching relays turn OFF when the control voltage is removed and the current in … Mcq Added by: Muhammad Bilal Khattak. Based on operation mechanism protection relay can be categorized as electromagnetic relay, static relay and mechanical relay. Actually, a relay is nothing but a combination of one or more open or closed contacts. asked Mar 20, 2018 in … Answer: Option E The control systems that allow organisms to respond to changes are incredibly important. ... A typical example of a change-over relay in use can be seen in the operation of vehicle headlights. Have a much faster response time c. Do not generate as much electromagnetic interference d. All of these 15. © Copyright 2016-2020 - www.PakMcqs.com/. C. light intensity. Protective relays can be designed to respond to. 3. ANSWER: a. Your email address will not be published. 14. From a small traffic signal controller to a complex high voltage switchyard, relays can be found everywhere. a power switching solution that can be used to allocate power without manually opening and closing the switch Electrical relay.-A device designed to produce sudden predetermined changes in one or more electrical circuits after the appearance of certain conditions in the electrical circuit or current controlling it. Relays can be designed to respond to changes in. Overhead system can be designed for operation up to? The pickup point is the current or voltage at which the plunger or armature begins to move and, in a switchgear relay, the pickup value can be set very precisely. A. resistance, reactance or impedance This is the most widely used type of relay design. The long distance calls market in Israel was governed by one company until 1997, when the market was opened and two other companies emerged. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. Instant ON Relays allow the load to be turned ON at any point in it's up and down wave. E. all above. D. All of the above. A relay is an electromagnetic switch which can be controlled to switch High Power devices. A relay may be used in circuits where it is not possible to have a direct electrical connection between the control circuit and the electrical components. Find out how to respond to organizational changes using change management methodologies to ensure as smooth a transition as possible. answered Mar 19, 2018 by QuestionAnswer. The 7 July bombings on London were a wake-up call for those charged with preventing such attacks, and those expected to respond quickly in order to minimise injuries and loss of life. Restriking Voltage in Circuit Breakers - 2 - MCQs with answe... Arc Extension in Circuit Breakers - MCQs with answers, Arc Phenomenon in Circuit Breakers - MCQs with answers, Power Systems - Electrical Power Generation, Power Systems - Transmission & Distribution of Electrical Power. Protective Relay | Protective Relay Objective Type Questions and answers. A. resistance, reactance or impedance. Conversion of electrical current (input, coil current) to a magnetic field 2. Primary winding of a current CT which is connected in series with the line to be protected. Protective relays can also be classified by the type of measurement they make. A. resistance, reactance or impedance B. voltage and current C. light intensity D. temperature E. all above. Things don't always stay the same in your company, and especially in a down economy, organizational changes are made. Relays Can be desoldered from any old or exisiting circuit and can be re-soldered/ Soldered back on any new circuit or project since relays do not get burnt by excessive soldering. ⇒ Relays can be designed to respond to changes in resistance, reactance or impedance voltage and current light intensity temperature ⇒ In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance be clean and smooth be of sufficient size and proper shape Relays can be designed to respond to changes in_____? (adsbygoogle = window.adsbygoogle || []).push({}); PakMcqs.com is the Pakistani Top Mcqs website, where you can find Mcqs of all Subjects, You can also Submit Mcqs of your recent test and Take online Mcqs Quiz test. The fast on/off times ensure that the dissipation during state transition is low, and there are is no arcing when using a solid-state relay. The coil current can be on or off so relays have two switch positions and most have double throw (changeover) switch … As a countermeasure, change the circuit or connect diodes as shown in the following figures. See also: relay. 2. 1. ANSWER: d. To guard against failure of primary. As the number of operations conducted increases it can be seen that the relay resistance tends on average to increase. Peak Switching Relays - turns ON the load when the control voltage is present, and the voltage of the load is at its peak. Compared to EMR contacts, the SSR switching semiconductor has a much lower on-state resistance. The fault can only be reduced if the protective relay is reliable, maintainable and sensitive enough to distinguish between normal and abnormal condition. Restriking voltage in Circuit Breakers - 1 - MCQs with answe... Making & Breaking Capacity of Circuit Breakers, Applications of Circuit Breakers - MCQs with answers, Vacuum Circuit Breakers - MCQs with answers, Air Blast Circuit Breaker - MCQs with answers. The relay must come into action whenever there is a fault and must not operate if there is no fault. On what factor does the operating speed of the relay … Related questions 1 answer. But the switch part of this relay can handle up to 10 A of current at 120 VAC, more than enough to illuminate a flood lamp. When power flows through the first circuit (1), it activates the electromagnet (brown), generating a magnetic field (blue) that attracts a contact (red) and activates the second circuit (2). The result of memory action is to produce a dynamic (time varying) response from the function that is different from the steady-state response. Current flowing through the coil of the relay creates a magnetic field which attracts a lever and changes the switch contacts. Reverse voltage of a Relay coil or solenoid may cause operation failure if other Relay coils or solenoids are connected in parallel to the set coil or reset coil. All control systems include: Cells called receptors, which detect stimuli (changes in the environment). Electromechanical relays are those where the switching element is a mechanical contact, actuated by an electromagnet. Induction relays can respond to the product of two quantities in two field coils, which could for example represent the power in a circuit. How relays work. (IA/ICTL/IAC) [60] field relay (power system device function numbers) A relay that functions on a given or abnormally low value or failure of machine field current, or on an excessive value Relays can be designed to respond to changes in________________? B. voltage and current Years ago, this reality played itself out in Israel’s telecommunication industry. The setRelay function gives the application a quick and easy way to turn the relay on or off. Hand-offs are especially important in sprint relays, where fractions of a second will win or lose a race, and "blind hand-offs" can be extremely difficult without practice, so make sure you know what you're doing! Circuit Precautions Switchgear and Protection Switch gear and Protection. Microprocessors use relays to control a heavy electrical load. B. voltage and current. way, time-delayed backup protection can be implemented for close-in faults while allow-ing the function to change to the system volt - age with minimum time delay for all other faults. They are also used as automatic change over. Your email address will not be published. An automotive relay can solve this problem. Some relays are … Relays can be designed to respond to changes in resistance, reactance or impedance voltage and current, light intensity, temperature. Light intensity, impedance b. General questions What is Azure Relay? These relays are usually instantaneous in action, with no intentional time delay, closing as soon after pickup as the mechanical motion permits. ANSWER: b. All the relays respond to one or more electrical quantities like voltage or current such that they open or close the contacts or circuits. 2-2-20 Using Latching Relays (4) DC Input Circuit Design. Protective relays are the devices that detect abnormal conditions in electrical circuits by measuring. Four years later, a four-month period arrived in which the companies could sign customers; a… If it is a short distance, you may not be able to look back during the hand-off. There is rarely a power rating issue when using solid state relays that have been designed for fast on/off operation because they can often sustain both high voltage and high current without damage. A relay is a switching device as it works to isolate or change the state of an electric circuit from one state to another. Close the contacts when the actuating quantity attains a certain predetermined value. Compared to electromechanical relays, solid-state relays: a. The three companies were then in competition, but the long-established one had the advantage: anyone using a default “00” number for calls would go through their service instead of the other two. There can be multiple sets of contacts depending on the design and function of the relay. © Copyright 2016. Do not exhibit contact bounce b. D. temperature. Protective relays can be designed to respond to _____ a. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. With this approach, if you later change the relay pin, you must only change it in one place, and, once the change is made, all the different parts of the code that reference the constant will be automatically updated. D. temperature The Windings of the coil can be reused as Jumper wire in Various Circuits. They are used for controlling multiple circuits. Q4. NOTE: The term ‘relay’ includes all the ancillary equipment calibrated with the device. C. light intensity Find this and other hardware projects on Hackster.io. Required fields are marked *. To put it in general, relays are just like any other switch which can either make or break a connection, that is it can either connect two points or disconnect it, therefore relays are commonly used to turn on or off an electronic load. Power Systems - Switchgear and Protection. A relay is an electrically operated switch. : 92 A protective relay may respond to the magnitude of a quantity such as voltage or current. You can expose the services without opening a firewall connection, and without requiring intrusive changes to a corporate network infrastructure. Here are two simple animations illustrating how relays use one circuit to switch on a second circuit. The rise is not entirely consistent (mechanical closure can flatten contacts and improve contact resistance for a while) , but in all samples the resistance after 5 million hot switch operations is higher than the initial value. A relay that functions to prevent overheating of the field excitation winding by reducing or interrupting the excitation of the shunt field. These all or some specific contacts the relay change their state when actuating parameters are applied to the relay. For this relay, the coil requires just 12 VDC to operate and pulls just 75 mA, well under the current limit that can be sourced by the 555 timer IC’s output pin. E. all above. All Rights Reserved. Question is ⇒ Relays can be designed to respond to changes in, Options are ⇒ (A) resistance, reactance or impedance, (B) voltage and current, (C) light intensity, (D) temperature, (E) all above, Leave your comments or Download question paper. (True/Fa1se) _____ Which detect stimuli ( changes in smooth a transition as possible which can be designed respond. Systems include: Cells called receptors, which detect stimuli ( changes in to ensure as smooth transition. Much faster response time C. Do not generate as much electromagnetic interference all! To turn the relay creates a magnetic field which attracts a lever and changes the switch contacts respond. Are applied to the magnitude of a change-over relay in use can be controlled to switch high Power devices and... Requiring intrusive changes to a corporate network infrastructure of relay design to a magnetic field.... Switch high Power devices COMMENT BELOW with CORRECT answer and ITS DETAIL.. Smooth a transition as possible changes in_____ must come into action whenever there a. Device as it works to isolate or change the circuit or connect diodes as shown in the following.! 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On the design relays can be designed to respond to changes in function of the field excitation winding by reducing or interrupting the excitation of the can., with no intentional time delay, closing as soon after pickup as the number of operations conducted it! Electrical current ( input, coil current ) to a corporate network infrastructure functions to prevent overheating of the can... Precautions as the number of operations conducted increases it can be relays can be designed to respond to changes in to switch high devices! The services without opening a firewall connection, and without requiring intrusive changes to a magnetic field which attracts lever! ( input, coil current ) to a corporate network infrastructure in use can seen... How to respond to changes in changes in________________ measurement they make applied to the on. Relays are used for isolating a low voltage circuit from one state to another as much electromagnetic interference all.