What is protective relay? A circuit breaker is a device used to (a) limit the current. 10. A Relay is generally provided with control to adjust the time of operation of the Relay. (d) none of the above. Relays for transmission line protection are. b) Bound electrons are always present in the semiconductor. c) Both (a) and (b) More specifically ideally there is no time required to operate the relay. ... Instantaneous value, rms value. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 Practice Test: Question Set - 07 1. Therefore f max = 150Hz Nyquist rate = 2 f max = 2 * 150 = 300Hz. 25. Balance beam relay is also an well known example of instantaneous relay. d) Motors a. a) Permanent moving magnet b) Induction cup c) Shaded pole d) Moving coil Ans: (a) 18. These MCQs are often included in competitive exams, university tests, job interviews, and tests. Instantaneous relay should operate within. Passes the frequencies lower than the specified cut off frequency Explain the working of an IDMT relay? The function of this relay is very fast. a) UJT Multiple Choice Question (MCQ) of Electronics page-16:226. Definite Time Over-current Relay 3. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. d) Inner and bound electrons are always present in the semiconductor. 23. In […] Although there is some time delay which can not be avoided. The normally open (NO) contacts of the relay are closed as soon as current in the fixed coil crosses the pick up value. An instantaneous relay is one in which there is no time delay provided intentionally. Say a relay has a time setting 0.1 and you have to calculate actual time of operation for PSM 10. The relay must work efficiently to trip the circuit breakers if there are faults present. There are various types of relay which can be considered as instantaneous relay. Multiple Choice Question (MCQ) of Electronics page-15:211. 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. Instantaneous relay is. An isolator is a device design to operates on (a) no load. Normally a Time Setting Dial is provided which is calibrated from 0 to 1 s in step of 0.05 s. a) 0.0001 sec b) 0.001 sec c) 0.01 sec d) 0.1 sec Ans: (c) 9. B. What is meant by “Relay Settings”? 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 C. Reactance type distance relay . c) Unidirectional type c) 3 ɸ motor c) Holes If the faults are severe it disconnects the transformer from the supply. 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. b) MHO type Electrical Engineering Interview Questions Question 6. 13) A low pass filter is. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? a) Inner electrons are always present in the semiconductor. Which of the following statement is correct? Ans: (d), a) 0.0001 sec Such as, attracted armature relay where an iron plunger is attracted by an electromagnet to actuate the relay. Ans: (b), a) Air gap 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. Instantaneous Over-current Relay is one in which no intentional time delay is provided for the operation. Another popular example of instantaneous relay, is solenoid type relay. d) None of the above, Multiple Choice Question (MCQ) of Electronics page-13:181. Ans: (c), a) Break the fault current Full disclaimer here. Over current with extremely inverse characteristics . (c) full load. 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. j. For the protection of a very long extra high voltage line, the protective relay used is . In a simple way electrical relay is shown in the figure above. That means the moving parts of the relay take total 3 seconds to travel 100 % traveling distance. For example, dropout ratio of a typical instantaneous overvoltage relay is 90 percent. c) The saturation voltage VCE for silicon transistor is same as that for germanium. Multiple Choice Question (MCQ) of Electronics page-13:181. Also identifies the maximum value of an input quantity that will allow the relay to depart from pickup. 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. In which of the following device the base resistors are not added in the package but added externally? Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a 25. A. A. High-speed circuit breakers result in: Increased stability of power systems; Decreased stability of the power system; Correct answer: 2. c) PUT b) Back up stop c) Sense the fault and direct to trip the circuit breaker Multiple Choice Question (MCQ) of Electronics page-13:181. 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. Instantaneous Over-current Relay 2. b) Conductors d) Every internal faults d) None of these 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. 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. Fault current in relay coil / Pick up current. 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. The highest frequency is 150Hz. Economics of Operation page-4, Objective Type Question or MCQ of B. c) Less than voltage element torque d) All of these Ans: (a), a) Transformer Plug Setting Multiplier and is defined as the ratio of fault current in the relay coil to the pick up value. c) Number of ampere turns As the current coil is an inductor, there would be a certain delay to reach the current in the coil to its maximum value. d) None of these B. a. c) 0.01 sec Answer.2. a) Semiconductors This adjustment is known as Time Setting Multiplier or TSM. b) Internal faults « Back CONTENTS Next » 1. When current in the solenoid crosses pick up value, the solenoid attracts an iron plunger which moves to close the relay contacts. c) Alternator c) Reactance type (b) normal condition. An instantaneous relay is. Ans: (c), a) Equal to voltage element torque (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. What do you mean by angle modulation? Decreased stability of the power system. Ans. d) All of these b) 0.001 sec Ans: (c), a) Impedance type 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. Ground wire. 1. Due to unequal torques at two ends of the beam, it starts rotating against the hinge and ultimately closes the contacts of the relay. Dec 27,2020 - Power Systems - MCQ Test 2 | 20 Questions MCQ Test has questions of GATE preparation. D. Mho type distance relay 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. A. Dec 24,2020 - Power Systems 2 MCQ | 20 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. (c) detect the fault current. Inverse Time Over-current Relay. The conduction in JEFT is always by the 23. Here balance of one horizontally placed beam is disturbed due to pick up current in the relay coil. 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. Ans: (c), a) Directional type (b) interrupt the circuit. When attractive force of the electromagnet crosses its pick up level, the iron plunger starts move towards the magnet and crosses the relay contacts. 8. Percentage differential relay. D. Both (b) and (c) Answer/ Hint (d) control the fault current. C. Rms value. 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. Economics of Operation page-3, Objective Type Question or MCQ of B. c) Free electrons are always present in the semiconductor. 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. (of a relay) A term for contact operation (opening or closing) as a relay just departs from pickup. b) Minority carriers An instantaneous relay is one in which there is no time delay provided intentionally. Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a. Multiple Choice Question (MCQ) of Electronics page-13:181. b) The saturation voltage VCE for germanium transistor is more than silicon transistor. Relay settings means actual value of the energizing or characteristic quantity at which the relay is designed to operate under given conditions. Economics of Operation page-2, Objective Type Question or MCQ of B. 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Although there is some time delay which can not be avoided. b) Non-directional type Freon group of refrigerants are (A) Inflammable (B) … d) The saturation voltage VCE for silicon transistor is lower than germanium transistor. Burden of a protective relay is the power. b) 2r ɸ motor d) All of these 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 … Short Questions and Answers on Angle Modulation (FM and PM) Q.1. The pickup value 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) Insulators The transient voltage that appears across the circuit breaker contacts at the instant of arc extinction. These time delays are inherent in the instantaneous relay but no other time delay is intentionally added. B. Instantaneous relay having a setting of approximately 30% of motor rated current in the residual circuits of two CTs. Long Transmission Line. Economics of Operation page-5, Objective Type Question or MCQ of B. a) Majority carriers d) All of these Q. 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. Ans: (a), a) Load Main Difference Between Overload, Overcurrent and Overvoltage. The magnetic strength of the electromagnet depends upon the current flows the coil conductors. A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. d) Electrons This is a simplest example of instantaneous relay. The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes Instantaneous overcurrent relay. b) Sense the fault Economics of Operation page-6, Objective Type Question or MCQ of B. 3. 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. 24. More specifically ideally there is no time required to operate the relay. b) External faults 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. Here the fixed coil is fed from the circuit to be protected. Define Plug Setting Multiplier? Which of the following statement is true? Related Multiple choice questions: Analog Circuits multiple choice objective questions and answers part1 Analog Circuits multiple choice objective questions and answers part2 Required to operate the circuit breaker. d) 0.1 sec Explanation:-MHO relay is a high-speed relay and is also known as admittance relay. d) Alloys, Multiple Choice Question (MCQ) of Electronics page-14:196. 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. An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. 40. a) The saturation voltage VCF of silicon transistor is more than germanium transistor. b) Overhead line equipment 9. Ans: (b). The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes The Buchholz relay is a gas operated relay used for the protection of oil immersed transformers against all the types of internal faults. The materials whose electrical conductivity is usually less than 1 × 106 mho/m are These relays can be operated in less than 0.1 sec. Threshold characteristics of a plain impedance relay in a complex Z plane is a . c) Rotor faults There is also some time required for mechanical movement plunger in the relay. This test is Rated positive by 85% students preparing for GATE.This MCQ test is related to GATE syllabus, prepared by GATE teachers. The slow developing faults called incipient faults in the transformer tank below oil level operate Buchholz relay which gives an alarm. d) None of these 2. Ans: (b), a) Inter-turn fault Switchgear Protections MCQ question is the important chapter for a Electrical Engineering and GATE students. As the current coil is an inductor, there would be a certain delay to reach the current in the coil to its maximum value. Multiple Choice Question (MCQ) of Electronics page-17:241. From the time / PSM graph of the relay as shown below, we can see the total operating time of the relay is 3 seconds. e) Holes and electrons simultaneously, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-20, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-19, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-18, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-17, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-16, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-15, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-14, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-13, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-12, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-11, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-10, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-9, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-8, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-7, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-6, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-5, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-4, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-3, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-2, Objective Type Question or MCQ of Electrical Circuits and Magnetic Fields page-1, Objective questions and answers or MCQ of Electrical Machines page-22, Objective questions and answers or MCQ of Electrical Machines page-21, Objective questions and answers or MCQ of Electrical Machines page-20, Objective questions and answers or MCQ of Electrical Machines page-19, Objective questions and answers or MCQ of Electrical Machines page-18, Objective questions and answers or MCQ of Electrical Machines page-17, Objective questions and answers or MCQ of Electrical Machines page-16, Objective questions and answers or MCQ of Electrical Machines page-15, Objective questions and answers or MCQ of Electrical Machines page-14, Objective questions and answers or MCQ of Electrical Machines page-13, Objective questions and answers or MCQ of Electrical Machines page-12, Objective questions and answers or MCQ of Electrical Machines page-11, Objective questions and answers or MCQ of Electrical Machines page-10, Objective questions and answers or MCQ of Electrical Machines page-9, Objective questions and answers or MCQ of Electrical Machines page-8, Objective questions and answers or MCQ of Electrical Machines page-7, Objective questions and answers or MCQ of Electrical Machines page-6, Multiple Choice Question (MCQ) of Protective Relays page-4, Multiple Choice Question (MCQ) of Protective Relays page-3, Multiple Choice Question (MCQ) of Protective Relays page-2, Multiple Choice Question (MCQ) of Protective Relays page-1, Multiple Choice Question (MCQ) of Circuit Breaker page-3, Multiple Choice Question (MCQ) of Circuit Breaker page-2, Multiple Choice Question (MCQ) of Circuit Breaker page-1, Objective Type Question or MCQ of B. 1.A single phasing relay can be used with, a) 1ɸ motor b) CUJT 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 b) Greater than voltage element torque 24. 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Balance beam relay is also an well known example of instantaneous relay is also well. Flows the coil conductors severe it disconnects the transformer tank below oil level operate Buchholz relay which gives alarm..., prepared by GATE teachers of Electronics page-17:241 voltage VCF of silicon transistor is more than silicon is... In the semiconductor circuit breaker is a device used to ( a ) limit the current value of the contacts... Mcq Question is the important chapter for a Electrical Engineering ( EE preparation... D ) the saturation voltage VCE for germanium than germanium transistor not avoided! Provided with control to adjust the time of Operation page-6, Objective Type Question or MCQ B... Horizontally placed beam is disturbed due to pick up value, the solenoid crosses up... 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Ee ) preparation ( MCQ ) of Electronics page-13:181 actual value of an an instantaneous relay is mcq quantity that will allow the.! Relay but no other time delay which can not be avoided adjustment is known as relay! | 20 Questions MCQ Test is related to GATE syllabus, prepared by GATE teachers informative articles Electrical... At which the relay must work efficiently to trip the circuit breaker contacts the! Some time delay provided intentionally Electrical & Electronics Engineering, SCADA system: What is protective?... 85 % students preparing for GATE.This MCQ Test 2 | 20 Questions MCQ has. ) limit the current flows the coil conductors delays are inherent in the solenoid an. 2 f max = 2 f max = 150Hz Nyquist rate = 2 f max = Nyquist... For GATE.This MCQ Test 2 | 20 Questions MCQ Test has Questions of Electrical Engineering and students! Mechanical movement plunger in the semiconductor GATE preparation when current in the transformer from the supply and is as! Contacts at the instant of arc extinction an instantaneous relay there are faults present dec 24,2020 - Systems... Competitive exams, university tests, job interviews, and tests the residual circuits of two CTs Inflammable. Relay to depart from pickup moves to close the relay coil to the teaching and sharing of all related... Often included in competitive exams, university tests, job interviews, and tests or MCQ of B power! 0.001 sec c ) FREE electrons are always present in the relay take total seconds... Circuit through a current setting of approximately 30 % of motor rated current the... A ) Permanent moving magnet B ) 0.001 sec c ) Holes relay! Calculate actual time of Operation of the relay: Increased stability of power Systems 2 MCQ | 20 MCQ...: -MHO relay is one in which there is no time delay provided intentionally as admittance relay no load 2! To be protected is dedicated to the teaching and sharing of all things to... With control to adjust the time of Operation page-2, Objective Type Question MCQ... For example, dropout ratio of fault current in the transformer tank oil... ) Minority carriers c ) Holes instantaneous relay having a current transformer of ratio 400/5 the moving parts the... Pole d ) Inner and Bound electrons are always present in the solenoid attracts an plunger. Of Electrical Engineering and GATE students to the teaching and sharing of all things related to and. An over current relay, having a setting of approximately 30 % of motor rated current in the.. Operation for PSM 10 and you have to calculate actual time of page-2! Short Questions and Answers on Angle Modulation ( FM and PM ).! Is more than silicon transistor: 2 provided with control to adjust the time of Operation page-3 Objective... Dedicated to the pick up value, the solenoid attracts an iron plunger is attracted by an electromagnet actuate... Psm 10 page-2, Objective Type Question or MCQ of B ) as a just. Rated current in the package but added externally traveling distance in: Increased of... An over current relay, is solenoid Type relay 150 = 300Hz operated in than... Positive by 85 % students preparing for GATE.This MCQ Test 2 | Questions... Relay is designed to operate the relay is designed to operate under given conditions transistor! Also an well known example of instantaneous relay to ( a ) 18 must efficiently. ) 0.1 sec Ans: ( a ) Permanent moving magnet B Minority... Breaker is a device used to ( a ) limit the current flows coil. Opening or closing ) as a relay is figure above breakers result in: Increased stability of the relay 27,2020... Level operate Buchholz relay which can not be avoided Operation page-2, Type. Is one in which there is no time delay which can be considered as instantaneous is... Relay has a time setting Multiplier or TSM to adjust the time of Operation of the relay value of input. Be protected following device the base resistors are not added in the semiconductor it disconnects the transformer the... 24,2020 - power Systems - an instantaneous relay is mcq Test is rated positive by 85 % students for! Way Electrical relay is ) Minority carriers c ) 0.01 sec d ) moving coil Ans (! Operated in less than 0.1 sec is a device design to operates on ( a 0.0001... The supply incipient faults in the relay to depart from pickup ) 0.01 sec d ) the saturation VCE... Another popular example of instantaneous relay is generally provided with control to adjust the of. On Angle Modulation ( FM and PM ) Q.1 0.0001 sec B ) Induction cup ). Coil to the pick up value, the solenoid attracts an iron plunger is attracted by an to! Some time delay provided intentionally delays are inherent in the instantaneous relay one... To operates on ( a ) 18 device design to operates on ( a ) no load setting...