The normally open (NO) contacts of the relay are closed as soon as current in the fixed coil crosses the pick up value. c) Alternator (of a relay) A term for contact operation (opening or closing) as a relay just departs from pickup. C. Reactance type distance relay . b) Minority carriers What is meant by “Relay Settings”? Economics of Operation page-2, Objective Type Question or MCQ of B. 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. a) Semiconductors Also identifies the maximum value of an input quantity that will allow the relay to depart from pickup. c) Rotor faults Economics of Operation page-5, Objective Type Question or MCQ of B. a) 0.0001 sec b) 0.001 sec c) 0.01 sec d) 0.1 sec Ans: (c) 9. Due to unequal torques at two ends of the beam, it starts rotating against the hinge and ultimately closes the contacts of the 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. 23. A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. Relay settings means actual value of the energizing or characteristic quantity at which the relay is designed to operate under given conditions. 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. 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. These MCQs are often included in competitive exams, university tests, job interviews, and tests. Relays for transmission line protection are. The pickup value is 8. b) Overhead line equipment d) Motors B. Ans. The function of this relay is very fast. 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. 9. Instantaneous Over-current Relay is one in which no intentional time delay is provided for the operation. Instantaneous relay is. Economics of Operation page-4, Objective Type Question or MCQ of B. Decreased stability of the power system. 10. 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: (c), a) Impedance type d) All of these Ans: (b), a) Air gap c) The saturation voltage VCE for silicon transistor is same as that for germanium. j. c) Reactance type Explanation:-MHO relay is a high-speed relay and is also known as admittance relay. d) 0.1 sec Multiple Choice Question (MCQ) of Electronics page-13:181. A. A. a. 1.A single phasing relay can be used with, a) 1ɸ motor a. Therefore f max = 150Hz Nyquist rate = 2 f max = 2 * 150 = 300Hz. Switchgear Protections MCQ question is the important chapter for a Electrical Engineering and GATE students. The Buchholz relay is a gas operated relay used for the protection of oil immersed transformers against all the types of internal faults. c) Holes d) None of these High-speed circuit breakers result in: Increased stability of power systems; Decreased stability of the power system; Correct answer: 2. Ans: (a), a) Load Ans: (a), a) Transformer b) 0.001 sec That means the moving parts of the relay take total 3 seconds to travel 100 % traveling distance. Say a relay has a time setting 0.1 and you have to calculate actual time of operation for PSM 10. D. Both (b) and (c) Answer/ Hint b) Internal faults In which of the following device the base resistors are not added in the package but added externally? Multiple Choice Question (MCQ) of Electronics page-17:241. Dec 27,2020 - Power Systems - MCQ Test 2 | 20 Questions MCQ Test has questions of GATE preparation. (c) detect the fault current. The slow developing faults called incipient faults in the transformer tank below oil level operate Buchholz relay which gives an alarm. Here balance of one horizontally placed beam is disturbed due to pick up current in the relay coil. A circuit breaker is a device used to (a) limit the current. Q. Freon group of refrigerants are (A) Inflammable (B) … Required to operate the circuit breaker. What do you mean by angle modulation? d) None of these The conduction in JEFT is always by the Here the fixed coil is fed from the circuit to be protected. An instantaneous relay is. 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Burden of a protective relay is the power. Which of the following statement is correct? Economics of Operation page-6, Objective Type Question or MCQ of B. Long Transmission Line. Ans: (b), a) Inter-turn fault Definite Time Over-current Relay 3. Multiple Choice Question (MCQ) of Electronics page-13:181. 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. (b) normal condition. An instantaneous relay is one in which there is no time delay provided intentionally. d) All of these This is a simplest example of instantaneous relay. The transient voltage that appears across the circuit breaker contacts at the instant of arc extinction. 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 24. b) Greater than voltage element torque (b) interrupt the circuit. Another popular example of instantaneous relay, is solenoid type relay. Instantaneous relay should operate within. Threshold characteristics of a plain impedance relay in a complex Z plane is a . 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 (c) full load. a) Hinged armature type b) Polarized type c) Balanced beam type d) All of these Ans: (a) 35. Although there is some time delay which can not be avoided. The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a 25. 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. d) Inner and bound electrons are always present in the semiconductor. For the protection of a very long extra high voltage line, the protective relay used is . As the current coil is an inductor, there would be a certain delay to reach the current in the coil to its maximum value. 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. The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes Explain the working of an IDMT relay? Balance beam relay is also an well known example of instantaneous 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 … (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. d) None of these Economics of Operation page-3, Objective Type Question or MCQ of B. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. 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. b) Non-directional type In […] c) Sense the fault and direct to trip the circuit breaker d) Electrons b) 2r ɸ motor C. Ground wire. 23. Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a. Define Plug Setting Multiplier? The highest frequency is 150Hz. d) None of the above, Multiple Choice Question (MCQ) of Electronics page-13:181. D. Mho type distance relay Ans: (c), a) Equal to voltage element torque 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. B. Instantaneous relay having a setting of approximately 30% of motor rated current in the residual circuits of two CTs. Dec 24,2020 - Power Systems 2 MCQ | 20 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. Related Multiple choice questions: Analog Circuits multiple choice objective questions and answers part1 Analog Circuits multiple choice objective questions and answers part2 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. 2. a) Majority carriers As the current coil is an inductor, there would be a certain delay to reach the current in the coil to its maximum 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. 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. d) Alloys, Multiple Choice Question (MCQ) of Electronics page-14:196. Over current with extremely inverse characteristics . 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. Although there is some time delay which can not be avoided. b) The saturation voltage VCE for germanium transistor is more than silicon transistor. Full disclaimer here. From the time / PSM graph of the relay as shown below, we can see the total operating time of the relay is 3 seconds. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? Percentage differential relay. a) Permanent moving magnet b) Induction cup c) Shaded pole d) Moving coil Ans: (a) 18. c) Less than voltage element torque The materials whose electrical conductivity is usually less than 1 × 106 mho/m are c) 3 ɸ motor c) 0.01 sec Answer.2. 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. C. Rms value. b) Conductors Ans: (d), a) 0.0001 sec More specifically ideally there is no time required to operate the relay. These time delays are inherent in the instantaneous relay but no other time delay is intentionally added. b) MHO type 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. c) PUT The relay must work efficiently to trip the circuit breakers if there are faults present. b) External faults a) The saturation voltage VCF of silicon transistor is more than germanium transistor. b) Back up stop This test is Rated positive by 85% students preparing for GATE.This MCQ test is related to GATE syllabus, prepared by GATE teachers. These relays can be operated in less than 0.1 sec. Multiple Choice Question (MCQ) of Electronics page-15:211. b) Sense the fault Multiple Choice Question (MCQ) of Electronics page-13:181. 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