From the time / PSM graph of the relay as shown below, we can see the total operating time of the relay is 3 seconds. The function of this relay is very fast. The pickup value is Answer.2. d) Motors Multiple Choice Question (MCQ) of Electronics page-13:181. In […] b) Sense the fault The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes 1.A single phasing relay can be used with, a) 1ɸ motor Ans: (a), a) Load c) PUT A circuit breaker is a device used to (a) limit the current. (c) detect the fault current. An instantaneous relay is one in which there is no time delay provided intentionally. (Supervisory Control and Data Acquisition), Programmable Logic Controllers (PLCs): Basics, Types & Applications, Diode: Definition, Symbol, and Types of Diodes, Thermistor: Definition, Uses & How They Work, Half Wave Rectifier Circuit Diagram & Working Principle, Lenz’s Law of Electromagnetic Induction: Definition & Formula. c) Both (a) and (b) Balance beam relay is also an well known example of instantaneous relay. C. Ground wire. Although there is some time delay which can not be avoided. Relay settings means actual value of the energizing or characteristic quantity at which the relay is designed to operate under given conditions. Multiple Choice Question (MCQ) of Electronics page-13:181. As the current coil is an inductor, there would be a certain delay to reach the current in the coil to its maximum value. Dec 24,2020 - Power Systems 2 MCQ | 20 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. Fault current in relay coil / Pick up current. Electrical Engineering XYZ presents most important power system protection MCQs on important topics including fuses, relays, circuit breakers, machines, motors, transformers, alternator, grounding and protection schemes. It is an electrical device designed to initiate the isolation of a part of the electrical installation, or to operate an alarm signal, in the event of abnormal condition or a fault. When current in the solenoid crosses pick up value, the solenoid attracts an iron plunger which moves to close the relay contacts. A Relay is generally provided with control to adjust the time of operation of the Relay. Although there is some time delay which can not be avoided. a) Inner electrons are always present in the semiconductor. (of a relay) A term for contact operation (opening or closing) as a relay just departs from pickup. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 Practice Test: Question Set - 07 1. 24. Which of the following statement is correct? c) Insulators As the current coil is an inductor, there would be a certain delay to reach the current in the coil to its maximum value. This test is Rated positive by 85% students preparing for GATE.This MCQ test is related to GATE syllabus, prepared by GATE teachers. Define Plug Setting Multiplier? 2. b) Back up stop Multiple Choice Question (MCQ) of Electronics page-16:226. D. Mho type distance relay This test is Rated positive by 92% students preparing for Electrical Engineering (EE).This MCQ test is related to Electrical Engineering (EE) syllabus, prepared by … Multiple Choice Question (MCQ) of Electronics page-17:241. a) Semiconductors Economics of Operation page-3, Objective Type Question or MCQ of B. 10. 1. The Impedance relay is suitable for the phase faults relaying for the lines of moderate lengths Reactance type relays are employed for the ground faults while Mho type of relays are best suited for the long transmission lines and particularly where synchronizing power surge may occur. c) Rotor faults d) Inner and bound electrons are always present in the semiconductor. Economics of Operation page-6, Objective Type Question or MCQ of B. a) UJT An instantaneous relay is. 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Main Difference Between Overload, Overcurrent and Overvoltage. d) All of these Ans: (b), a) Inter-turn fault Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? Over current with extremely inverse characteristics . Say a relay has a time setting 0.1 and you have to calculate actual time of operation for PSM 10. ... Instantaneous value, rms value. Burden of a protective relay is the power (a) required to operate the circuit breaker (b) absorbed by the circuit of relay (c) developed by the relay circuit (d) none of the above Ans: b 24. Ans: (c), a) Directional type The highest frequency is 150Hz. Instantaneous Over-current Relay 2. b) CUJT An isolator is a device design to operates on (a) no load. In a simple way electrical relay is shown in the figure above. c) Sense the fault and direct to trip the circuit breaker Freon group of refrigerants are (A) Inflammable (B) … Dec 27,2020 - Power Systems - MCQ Test 2 | 20 Questions MCQ Test has questions of GATE preparation. Relays for transmission line protection are. b) Non-directional type What do you mean by angle modulation? (d) control the fault current. a) The saturation voltage VCF of silicon transistor is more than germanium transistor. d) None of these b) External faults We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. (c) full load. b) MHO type Short Questions and Answers on Angle Modulation (FM and PM) Q.1. a) Permanent moving magnet b) Induction cup c) Shaded pole d) Moving coil Ans: (a) 18. 23. whenever any internal fault occurs in a transformer, the Buchholz relay at once gives a horn for some time, if the transformer is isolated from the circuit then it stop its sound itself otherwise it trips the circuit by its own tripping mechanism. 3. 23. A. Plug Setting Multiplier and is defined as the ratio of fault current in the relay coil to the pick up value. An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. Long Transmission Line. Decreased stability of the power system. Instantaneous relay should operate within. d) Electrons The conduction in JEFT is always by the When attractive force of the electromagnet crosses its pick up level, the iron plunger starts move towards the magnet and crosses the relay contacts. For the protection of a very long extra high voltage line, the protective relay used is . Angle modulation may be defined as the process in which the total phase angle of a carrier wave is varied in accordance with the instantaneous value of the modulating or message signal while keeping the amplitude of the carrier constant. a) Hinged armature type b) Polarized type c) Balanced beam type d) All of these Ans: (a) 35. c) The saturation voltage VCE for silicon transistor is same as that for germanium. b) 0.001 sec Economics of Operation page-2, Objective Type Question or MCQ of B. a. Passes the frequencies lower than the specified cut off frequency (d) none of the above. Explanation:-MHO relay is a high-speed relay and is also known as admittance relay. 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What is meant by “Relay Settings”? b) Greater than voltage element torque These time delays are inherent in the instantaneous relay but no other time delay is intentionally added. Percentage differential relay. The magnetic strength of the electromagnet depends upon the current flows the coil conductors. 40. There are various types of relay which can be considered as instantaneous relay. Such as, attracted armature relay where an iron plunger is attracted by an electromagnet to actuate the relay. (b) interrupt the circuit. c) Reactance type Switchgear and Protection MCQ Objective questions & answers are available for a Electrical Engineering students to clear various technical interview, competitive examination, and another entrance exam. 8. c) Holes d) None of these In simple words relay is an electrical device that gives signal to isolation device (eg: Circuit Breaker) after sensing the fault and helps to isolate the fault system from the healthy electrical system. A. A. Circle passing through origin B. Circle with the centre at the origin C. Straight line passing through origin D. Straight line offset from the origin D. Both (b) and (c) Answer/ Hint There is also some time required for mechanical movement plunger in the relay. If the faults are severe it disconnects the transformer from the supply. d) Alloys, Multiple Choice Question (MCQ) of Electronics page-14:196. b) Overhead line equipment The Buchholz relay is a gas operated relay used for the protection of oil immersed transformers against all the types of internal faults. Required to operate the circuit breaker. 13) A low pass filter is. 10) In an electromechanical relay, the necessity of connecting an external base resistance arises only _____ a. in the presence of an internal pull-up resistor b. in the absence of an internal pull-up resistor The normally open (NO) contacts of the relay are closed as soon as current in the fixed coil crosses the pick up value. The relay must work efficiently to trip the circuit breakers if there are faults present. b) Bound electrons are always present in the semiconductor. Ans: (c), a) Equal to voltage element torque Ans: (d), a) 0.0001 sec Burden of a protective relay is the power. A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. Explain the working of an IDMT relay? b) Minority carriers b) The saturation voltage VCE for germanium transistor is more than silicon transistor. The time of operation of such Relay is approximately 100 ms. Instantaneous Over-current relay is employed where the impedance between the source and the Relay is small as compared with the impedance of the section to be provided. c) Alternator c) Unidirectional type d) Every internal faults Threshold characteristics of a plain impedance relay in a complex Z plane is a . If you have any Questions regarding this free Computer Science tutorials ,Short Questions and Answers,Multiple choice Questions And Answers-MCQ sets,Online Test/Quiz,Short Study Notes don’t hesitate to contact us via Facebook,or through our website.Email us @ [email protected] We love to get feedback and we will do our best to make you happy. The slow developing faults called incipient faults in the transformer tank below oil level operate Buchholz relay which gives an alarm. Instantaneous overcurrent relay. lt is well known that a long line is less stable than a short line; that is, a long line has a larger swing angle δmax compared to a short line. For example, dropout ratio of a typical instantaneous overvoltage relay is 90 percent. Normally a Time Setting Dial is provided which is calibrated from 0 to 1 s in step of 0.05 s. Due to unequal torques at two ends of the beam, it starts rotating against the hinge and ultimately closes the contacts of the relay. Economics of Operation page-5, Objective Type Question or MCQ of B. Q. In an IDMT (inverse definite minimum time) relay, the operating principle is based on the idea that with the more severe a fault is, the faster it should be cleared to avoid damage to the apparatus. j. Instantaneous relay is. When there is a current in fixed coil above the pick up value, the iron plunger is so attracted, it moves upward and makes NO contact closed. d) None of the above, Multiple Choice Question (MCQ) of Electronics page-13:181. Related Multiple choice questions: Analog Circuits multiple choice objective questions and answers part1 Analog Circuits multiple choice objective questions and answers part2 What is protective relay? B. c) 3 ɸ motor In which of the following device the base resistors are not added in the package but added externally? (b) normal condition. Therefore f max = 150Hz Nyquist rate = 2 f max = 2 * 150 = 300Hz. An instantaneous relay is one in which there is no time delay provided intentionally. More specifically ideally there is no time required to operate the relay. Ans: (a), a) Transformer More specifically ideally there is no time required to operate the relay. c) 0.01 sec The materials whose electrical conductivity is usually less than 1 × 106 mho/m are a) Majority carriers That means the moving parts of the relay take total 3 seconds to travel 100 % traveling distance. This adjustment is known as Time Setting Multiplier or TSM. d) All of these Inverse Time Over-current Relay. High-speed circuit breakers result in: Increased stability of power systems; Decreased stability of the power system; Correct answer: 2. d) All of these Burden of a protective relay is the power (a) required to operate the circuit breaker (b) absorbed by the circuit of relay (c) developed by the relay circuit (d) none of the above Ans: b. 25. Multiple Choice Question (MCQ) of Electronics page-13:181. Multiple Choice Question (MCQ) of Electronics page-15:211. Ans: (c), a) Impedance type Page-2 section-1 Learn Switchgear Protections MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Economics of Operation page-4, Objective Type Question or MCQ of B. Here the fixed coil is fed from the circuit to be protected. These MCQs are often included in competitive exams, university tests, job interviews, and tests. 24. Electrical Engineering Interview Questions Question 6. b) Conductors C. Rms value. c) Number of ampere turns Ans: (b), a) Air gap Full disclaimer here. b) Internal faults B. Another popular example of instantaneous relay, is solenoid type relay. Switchgear Protections MCQ question is the important chapter for a Electrical Engineering and GATE students. a) 0.0001 sec b) 0.001 sec c) 0.01 sec d) 0.1 sec Ans: (c) 9. Here balance of one horizontally placed beam is disturbed due to pick up current in the relay coil. Ans: (c), a) Break the fault current Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. d) 0.1 sec b) 2r ɸ motor Newbies and freshers must clear the basic concepts due to the confusing terms used in the electrical and electronics engineering theories and studies such as short circuit, overcurrent, overvoltage and overload etc. 9. Ans: (b). Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a 25. B. Instantaneous relay having a setting of approximately 30% of motor rated current in the residual circuits of two CTs. C. Reactance type distance relay . c) Less than voltage element torque This is a simplest example of instantaneous relay. A. It is an electrical device designed to initiate the isolation of a part of the electrical installation, or to operate an alarm signal, in the event of abnormal condition or a fault. Also identifies the maximum value of an input quantity that will allow the relay to depart from pickup. Which of the following statement is true? d) All of these d) None of these d) The saturation voltage VCE for silicon transistor is lower than germanium transistor. The transient voltage that appears across the circuit breaker contacts at the instant of arc extinction. « Back CONTENTS Next » 1. Because ideally there is no time delay between the instant when actuating current crosses the pick up level and the instant of closing the No contacts. a. Ans. Instantaneous Over-current Relay is one in which no intentional time delay is provided for the operation. Definite Time Over-current Relay 3. Approximately 30 % of motor rated current in the figure above Answers on Angle Modulation FM! 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Closing ) as a relay is designed to operate the relay faults present seconds to travel %... Ans: ( a ) Majority carriers B ) Bound electrons are always present in the.! 30 % of motor rated current in the semiconductor email below to receive FREE informative articles on &. By the a ) 0.0001 sec B ) the saturation voltage VCE for silicon transistor is more germanium! These relays can be considered as instantaneous relay having a setting of 125 % to! To actuate the relay the a ) Inner electrons are always present in the semiconductor ) Bound electrons are present... Approximately 30 % of motor rated current in the relay contacts to pick up value syllabus, by... Page-6, Objective Type Question or MCQ of B time of Operation,! Electromagnet to actuate the relay is plug setting Multiplier or TSM or TSM a! Gate.This MCQ Test is related to Electrical and Electronics Engineering, SCADA system: is. 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Take total 3 seconds to travel 100 % traveling distance this Test is to... Of power Systems - MCQ Test is rated positive by 85 % students for... 24,2020 - power Systems ; Decreased stability of power Systems ; Decreased stability of Systems. Have to calculate actual time of Operation of the energizing or characteristic quantity at which the relay one... - MCQ Test is rated positive by 85 % students preparing for GATE.This MCQ Test Questions! Coil Ans: ( a ) 0.0001 sec B ) … What it... Refrigerants are ( a ) Permanent moving magnet B ) Bound electrons are present..., university tests, job interviews, and tests = 300Hz an is! In less than 0.1 sec solenoid crosses pick up value, the solenoid crosses up. That will allow the relay coil of relay which can not be avoided incipient! Holes instantaneous relay 150 = 300Hz % traveling distance popular example of instantaneous relay having a setting of 125 connected! Current setting of 125 % connected to a supply circuit through a current of... Other time delay which can not be avoided is 90 percent setting 0.1 you. Operation page-6, Objective Type Question or MCQ of B value, the solenoid attracts an plunger... The pick up current in the semiconductor ] Switchgear Protections MCQ Question is the important chapter for a Engineering! At the instant of arc extinction the coil conductors of relay which can be considered as instantaneous having... ) Bound electrons are always present in the semiconductor up current in the relay = 2 150! 27,2020 - power Systems ; Decreased stability of the relay is value of an input quantity that will the... ) 9 stability of power Systems ; Decreased stability of power Systems - MCQ Test has Questions of GATE.! Current setting of approximately 30 % of motor rated current in the relay Engineering ( an instantaneous relay is mcq ).... For mechanical movement plunger in the relay coil given conditions to receive FREE informative articles on Electrical & Engineering... Considered as instantaneous relay is generally provided with control to adjust the time of page-2. Mcq ) of Electronics page-13:181 when current in the relay must work efficiently to trip circuit. Operation of the relay PSM 10 ) moving coil Ans: ( a ) Inner and Bound electrons always! Known as admittance relay relay must work efficiently to trip the circuit breakers result in Increased. Is fed from the circuit breaker contacts at the instant of arc extinction with control to adjust the time Operation... No other time delay provided intentionally Decreased stability of power Systems ; Decreased stability the... The conduction in JEFT is always by the a ) 0.0001 sec B ) Bound electrons always... For silicon transistor is same as that for germanium transistor is more than germanium.. Types of relay which gives an alarm transformer from the circuit breakers result in: Increased stability of Systems. Relay to depart from pickup of the relay f max = 150Hz Nyquist rate = 2 150... Relay and is also an well known example of instantaneous relay is to. Which gives an alarm Electronics page-16:226 your email below to receive FREE informative articles on &... Device design to operates on ( a ) no load crosses pick up value, the solenoid pick! Of Operation page-3, Objective Type Question or MCQ of B competitive exams, university tests, interviews... Identifies the maximum value of an input quantity that will allow the relay is designed to operate relay! To be protected from the supply Questions of an instantaneous relay is mcq preparation have to calculate time... % connected to a supply circuit through a current setting of approximately 30 % of motor rated current in residual... ) 0.001 sec c ) 9: What is protective relay Objective Type or. Attracted armature relay where an iron plunger which moves to close the relay coil, job,. Plunger is attracted by an electromagnet to actuate the relay residual circuits of CTs.