d) None of these More specifically ideally there is no time required to operate the relay. 24. Multiple Choice Question (MCQ) of Electronics page-17:241. B. Another popular example of instantaneous relay, is solenoid type 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. This adjustment is known as Time Setting Multiplier or TSM. a) Inner electrons are always present in the semiconductor. 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. Economics of Operation page-2, Objective Type Question or MCQ of B. Switchgear Protections MCQ question is the important chapter for a Electrical Engineering and GATE students. (b) interrupt the circuit. Ans: (d), a) 0.0001 sec c) Number of ampere turns The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes B. Instantaneous relay having a setting of approximately 30% of motor rated current in the residual circuits of two CTs. Here balance of one horizontally placed beam is disturbed due to pick up current in the relay coil. 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. High-speed circuit breakers result in: Increased stability of power systems; Decreased stability of the power system; Correct answer: 2. Over current with extremely inverse characteristics . b) MHO type Percentage differential relay. A. Multiple Choice Question (MCQ) of Electronics page-15:211. Define Plug Setting Multiplier? D. Both (b) and (c) Answer/ Hint d) Alloys, Multiple Choice Question (MCQ) of Electronics page-14:196. d) None of these Instantaneous Over-current Relay is one in which no intentional time delay is provided for the operation. For the protection of a very long extra high voltage line, the protective relay used is . a. c) 3 ɸ motor Multiple Choice Question (MCQ) of Electronics page-16:226. Which of the following statement is correct? Plug Setting Multiplier and is defined as the ratio of fault current in the relay coil to the pick up value. A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. Related Multiple choice questions: Analog Circuits multiple choice objective questions and answers part1 Analog Circuits multiple choice objective questions and answers part2 Say a relay has a time setting 0.1 and you have to calculate actual time of operation for PSM 10. 24. Economics of Operation page-4, Objective Type Question or MCQ of B. c) The saturation voltage VCE for silicon transistor is same as that for germanium. Instantaneous Over-current Relay 2. 2. 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. 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. The relay must work efficiently to trip the circuit breakers if there are faults present. An instantaneous relay is one in which there is no time delay provided intentionally. ... Instantaneous value, rms value. c) Insulators 3. b) Greater than voltage element torque 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. b) Internal faults d) Electrons b) Sense the fault The magnetic strength of the electromagnet depends upon the current flows the coil conductors. The pickup value is Relays for transmission line protection are. 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. 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. 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. If the faults are severe it disconnects the transformer from the supply. Threshold characteristics of a plain impedance relay in a complex Z plane is a . 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. 23. Explain the working of an IDMT relay? The highest frequency is 150Hz. This test is Rated positive by 85% students preparing for GATE.This MCQ test is related to GATE syllabus, prepared by GATE teachers. d) The saturation voltage VCE for silicon transistor is lower than germanium transistor. Ans. The function of this relay is very fast. What is meant by “Relay Settings”? « Back CONTENTS Next » 1. a. Such as, attracted armature relay where an iron plunger is attracted by an electromagnet to actuate the relay. Due to unequal torques at two ends of the beam, it starts rotating against the hinge and ultimately closes the contacts of the relay. c) Both (a) and (b) a) 0.0001 sec b) 0.001 sec c) 0.01 sec d) 0.1 sec Ans: (c) 9. a) Hinged armature type b) Polarized type c) Balanced beam type d) All of these Ans: (a) 35. C. Ground wire. Inverse Time Over-current Relay. From the time / PSM graph of the relay as shown below, we can see the total operating time of the relay is 3 seconds. c) Alternator j. 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