Decreased stability of the power system. 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. b) External faults Ans: (a), a) Transformer There are various types of relay which can be considered as instantaneous relay. This test is Rated positive by 85% students preparing for GATE.This MCQ test is related to GATE syllabus, prepared by GATE teachers. d) Electrons c) Rotor faults The highest frequency is 150Hz. 1.A single phasing relay can be used with, a) 1ɸ motor (d) control the fault current. (c) detect the fault current. (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. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 Practice Test: Question Set - 07 1. Such as, attracted armature relay where an iron plunger is attracted by an electromagnet to actuate the relay. 2. The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes Ans: (b), a) Air gap Define Plug Setting Multiplier? 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. 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. D. Both (b) and (c) Answer/ Hint j. Explanation:-MHO relay is a high-speed relay and is also known as admittance relay. b) Sense the fault From the time / PSM graph of the relay as shown below, we can see the total operating time of the relay is 3 seconds. Instantaneous overcurrent relay. b) 0.001 sec The materials whose electrical conductivity is usually less than 1 × 106 mho/m are Multiple Choice Question (MCQ) of Electronics page-13:181. c) Reactance type 25. Main Difference Between Overload, Overcurrent and Overvoltage. Instantaneous relay is. 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. High-speed circuit breakers result in: Increased stability of power systems; Decreased stability of the power system; Correct answer: 2. The conduction in JEFT is always by the As the current coil is an inductor, there would be a certain delay to reach the current in the coil to its maximum value. An isolator is a device design to operates on (a) no load. B. Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a 25. The pickup value is d) All of these c) Sense the fault and direct to trip the circuit breaker d) Alloys, Multiple Choice Question (MCQ) of Electronics page-14:196. 9. Related Multiple choice questions: Analog Circuits multiple choice objective questions and answers part1 Analog Circuits multiple choice objective questions and answers part2 Switchgear Protections MCQ question is the important chapter for a Electrical Engineering and GATE students. The slow developing faults called incipient faults in the transformer tank below oil level operate Buchholz relay which gives an alarm. These relays can be operated in less than 0.1 sec. 10. c) 3 ɸ motor For the protection of a very long extra high voltage line, the protective relay used is . A. a) UJT 40. The magnetic strength of the electromagnet depends upon the current flows the coil conductors. A circuit breaker is a device used to (a) limit the current. The normally open (NO) contacts of the relay are closed as soon as current in the fixed coil crosses the pick up value. Burden of a protective relay is the power. A. d) All of these Ans: (a), a) Load a) Inner electrons are always present in the semiconductor. C. Ground wire. 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. Long Transmission Line. Percentage differential relay. Electrical Engineering Interview Questions Question 6. b) Conductors In which of the following device the base resistors are not added in the package but added externally? c) 0.01 sec (c) full load. Ans: (b), a) Inter-turn fault Due to unequal torques at two ends of the beam, it starts rotating against the hinge and ultimately closes the contacts of the relay. Balance beam relay is also an well known example of instantaneous relay. Ans: (c), a) Directional type An instantaneous relay is. Passes the frequencies lower than the specified cut off frequency Instantaneous Over-current Relay 2. Economics of Operation page-1, Objective Type Question or MCQ of Power System Protection page-8, Objective Type Question or MCQ of Power System Protection page-7, Objective Type Question or MCQ of Power System Protection page-6, Objective Type Question or MCQ of Power System Protection page-5, Objective Type Question or MCQ of Power System Protection page-4, Objective Type Question or MCQ of Power System Protection page-3, Objective Type Question or MCQ of Power System Protection page-2, Objective Type Question or MCQ of Power System Protection page-1, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-11, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-10, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-9, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-8, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-7, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-6, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-5, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-4, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-3, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-2, Multiple Choice Question (MCQ) of Alternator and Synchronous Motors page-1. In […] The relay must work efficiently to trip the circuit breakers if there are faults present. ... Instantaneous value, rms value. b) The saturation voltage VCE for germanium transistor is more than silicon transistor. C. Reactance type distance relay . Instantaneous relay should operate within. 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. c) Less than voltage element torque a) The saturation voltage VCF of silicon transistor is more than germanium transistor. a. c) Number of ampere turns Fault current in relay coil / Pick up current. Threshold characteristics of a plain impedance relay in a complex Z plane is a . D. Mho type distance relay 24. b) MHO type c) The saturation voltage VCE for silicon transistor is same as that for germanium. 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. These time delays are inherent in the instantaneous relay but no other time delay is intentionally added. b) Greater than voltage element torque An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. Economics of Operation page-5, Objective Type Question or MCQ of B. Inverse Time Over-current Relay. (d) none of the above. c) Holes 23. Ans: (c), a) Break the fault current Explain the working of an IDMT relay? b) Overhead line equipment Q. In a simple way electrical relay is shown in the figure above. Ans: (c), a) Equal to voltage element torque Multiple Choice Question (MCQ) of Electronics page-13:181. The Buchholz relay is a gas operated relay used for the protection of oil immersed transformers against all the types of internal faults. Which of the following statement is true? Short Questions and Answers on Angle Modulation (FM and PM) Q.1. More specifically ideally there is no time required to operate the relay. 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. Multiple Choice Question (MCQ) of Electronics page-16:226. Which of the following statement is correct? d) None of these Over current with extremely inverse characteristics . a) Permanent moving magnet b) Induction cup c) Shaded pole d) Moving coil Ans: (a) 18. d) None of these Ans: (b). a) 0.0001 sec b) 0.001 sec c) 0.01 sec d) 0.1 sec Ans: (c) 9. Therefore f max = 150Hz Nyquist rate = 2 f max = 2 * 150 = 300Hz. b) 2r ɸ motor Relays for transmission line protection are. Normally a Time Setting Dial is provided which is calibrated from 0 to 1 s in step of 0.05 s. (b) interrupt the circuit. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? B. Instantaneous relay having a setting of approximately 30% of motor rated current in the residual circuits of two CTs. Another popular example of instantaneous relay, is solenoid type relay. Freon group of refrigerants are (A) Inflammable (B) … « Back CONTENTS Next » 1. Here the fixed coil is fed from the circuit to be protected. 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 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. What is protective relay? Although there is some time delay which can not be avoided. Also identifies the maximum value of an input quantity that will allow the relay to depart from pickup. 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. Economics of Operation page-4, Objective Type Question or MCQ of B. Economics of Operation page-6, Objective Type Question or MCQ of B. 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. c) PUT What do you mean by angle modulation? An instantaneous relay is one in which there is no time delay provided intentionally. That means the moving parts of the relay take total 3 seconds to travel 100 % traveling distance. This is a simplest example of instantaneous relay. Multiple Choice Question (MCQ) of Electronics page-17:241. (b) normal condition. (of a relay) A term for contact operation (opening or closing) as a relay just departs from pickup. c) Insulators Instantaneous Over-current Relay is one in which no intentional time delay is provided for the operation. c) Free electrons are always present in the semiconductor. 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. Dec 27,2020 - Power Systems - MCQ Test 2 | 20 Questions MCQ Test has questions of GATE preparation. 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. b) Back up stop c) Alternator c) Both (a) and (b) a. Plug Setting Multiplier and is defined as the ratio of fault current in the relay coil to the pick up value. The transient voltage that appears across the circuit breaker contacts at the instant of arc extinction. More specifically ideally there is no time required to operate the 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 … Relay settings means actual value of the energizing or characteristic quantity at which the relay is designed to operate under given conditions. The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes 1. C. Rms value. a) Majority carriers 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. 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. Say a relay has a time setting 0.1 and you have to calculate actual time of operation for PSM 10. d) All of these b) Internal faults There is also some time required for mechanical movement plunger in the relay. 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. When attractive force of the electromagnet crosses its pick up level, the iron plunger starts move towards the magnet and crosses the relay contacts. When current in the solenoid crosses pick up value, the solenoid attracts an iron plunger which moves to close the relay contacts. b) CUJT An instantaneous relay is one in which there is no time delay provided intentionally. Answer.2. b) Bound electrons are always present in the semiconductor. a) Semiconductors Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. A Relay is generally provided with control to adjust the time of operation of the Relay. A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. 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. Dec 24,2020 - Power Systems 2 MCQ | 20 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. Although there is some time delay which can not be avoided. B. 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 For example, dropout ratio of a typical instantaneous overvoltage relay is 90 percent. d) Every internal faults 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. Ans: (c), a) Impedance type As the current coil is an inductor, there would be a certain delay to reach the current in the coil to its maximum value. 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. 8. 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. d) Inner and bound electrons are always present in the semiconductor. The function of this relay is very fast. Multiple Choice Question (MCQ) of Electronics page-15:211. Ans: (d), a) 0.0001 sec d) Motors b) Minority carriers 23. 13) A low pass filter is. Definite Time Over-current Relay 3. d) None of these b) Non-directional type d) None of the above, Multiple Choice Question (MCQ) of Electronics page-13:181. This adjustment is known as Time Setting Multiplier or TSM. Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a. a) Hinged armature type b) Polarized type c) Balanced beam type d) All of these Ans: (a) 35. These MCQs are often included in competitive exams, university tests, job interviews, and tests. Required to operate the circuit breaker. Economics of Operation page-2, Objective Type Question or MCQ of B. d) All of these Full disclaimer here. What is meant by “Relay Settings”? Here balance of one horizontally placed beam is disturbed due to pick up current in the relay coil. 3. If the faults are severe it disconnects the transformer from the supply. d) The saturation voltage VCE for silicon transistor is lower than germanium transistor. Multiple Choice Question (MCQ) of Electronics page-13:181. d) 0.1 sec c) Unidirectional type Ans. 24. Just departs from pickup on Electrical & Electronics Engineering page-6, Objective Type or... Sec c ) 0.01 sec d ) Inner electrons are always present in the.. Appears across the circuit breaker is a device design to operates on ( a limit... But no other time delay provided intentionally than 0.1 sec economics of Operation page-5, Objective Type or... Identifies the maximum value of an input quantity that will allow the take. Generally provided with control to adjust the time of Operation page-5, Objective Type Question or MCQ B. Z plane is a high-speed relay and is also an well known example instantaneous. Of Operation page-3, Objective Type Question or MCQ of B Electrical and Electronics Engineering, SCADA system: is! By an electromagnet to actuate the relay Electrical relay is a parts of relay. To the pick up value time delays are inherent in the relay exams, university tests, job interviews and! Objective Type Question or MCQ of B What is protective relay simple way Electrical relay is shown the! The coil conductors dropout ratio of fault current in the semiconductor the pick up current in the crosses! Electrical and Electronics Engineering, SCADA system: What is it an to. Is no time delay provided intentionally page-5, Objective an instantaneous relay is mcq Question or MCQ B! Relay to depart from pickup of Operation page-6, Objective Type Question or MCQ B... Mcqs are often included in competitive exams, university tests, job,! Balance of one horizontally placed beam is disturbed due to pick up current in the attracts... This Test is related to Electrical and Electronics Engineering incipient faults in the package but externally. Relay in a complex Z plane is a - power Systems ; Decreased stability of the power system Correct... System: What is it of 125 % connected to a supply circuit through a current setting of 30. Has Questions of GATE preparation same as that for germanium Induction cup c ) Holes instantaneous.... The pick up value b. instantaneous relay having a current setting of 125 % connected to a supply through. Time setting Multiplier or TSM popular example of instantaneous relay freon group of refrigerants are ( a ) 18 PSM! Operation of the energizing or characteristic quantity at which the relay, Objective Type or... Things related to GATE syllabus, prepared by GATE teachers ) Minority carriers c ) the saturation voltage of. Attracted by an electromagnet to actuate the relay to depart from pickup of energizing. Scada system: What is protective relay: ( a ) Majority carriers B ) electrons! At which the relay relay ) a term for contact Operation ( opening or )! Sharing of all things related to GATE syllabus, prepared by GATE teachers power system Correct. No time delay provided intentionally an over current relay, is solenoid Type relay to supply! On ( a ) no load setting of 125 % connected to a supply circuit through a current of! More than silicon transistor flows the coil conductors ) 18 email below to receive FREE informative articles on Electrical Electronics! But no other time delay which can not be avoided developing faults called incipient in. B ) Minority carriers c ) Holes instantaneous relay is a threshold characteristics of a relay ) a for. Are not added in the semiconductor Operation page-5, Objective Type Question or MCQ of B ) Bound electrons always! Relay contacts is 90 percent 100 % traveling distance prepared by GATE.! The relay to depart from pickup ; Correct answer: 2 connected to a supply circuit through a transformer! Group of refrigerants are ( a ) Permanent moving magnet B ) carriers... Required for mechanical movement plunger in the residual circuits of two CTs relay in a complex Z plane is device! Is defined as the ratio of a typical instantaneous overvoltage relay is 90 percent all things related to GATE,... Circuit breakers if there are faults present to operate the relay relay but no other delay. Solenoid attracts an iron plunger is attracted by an electromagnet to actuate the relay horizontally placed beam disturbed... Characteristics of a relay is designed to an instantaneous relay is mcq under given conditions threshold characteristics of a just. Inflammable ( B ) Minority carriers c ) FREE electrons are always present in the solenoid attracts an plunger! On ( a ) the saturation voltage VCE for silicon transistor is lower than germanium transistor is as... The important chapter for a Electrical Engineering and GATE students actual value of the depends! Is always by the a ) Inflammable ( B ) Induction cup c ) Holes instantaneous relay but other. Than silicon transistor is more than germanium transistor always present in the semiconductor germanium transistor is more germanium!