an instantaneous relay is mcq

Ans: (c), a) Directional type High-speed circuit breakers result in: Increased stability of power systems; Decreased stability of the power system; Correct answer: 2. What do you mean by angle modulation? 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. Here balance of one horizontally placed beam is disturbed due to pick up current in the relay coil. d) Inner and bound electrons are always present in the semiconductor. This adjustment is known as Time Setting Multiplier or TSM. b) External faults b) Sense the fault 24. 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. Main Difference Between Overload, Overcurrent and Overvoltage. 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. (b) normal condition. d) None 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 … c) PUT 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) None of the above, Multiple Choice Question (MCQ) of Electronics page-13:181. 25. Instantaneous Over-current Relay 2. b) CUJT Fault current in relay coil / Pick up current. c) The saturation voltage VCE for silicon transistor is same as that for germanium. c) Sense the fault and direct to trip the circuit breaker ... Instantaneous value, rms value. This is a simplest example of instantaneous relay. Balance beam relay is also an well known example of instantaneous relay. Here the fixed coil is fed from the circuit to be protected. 23. A. Multiple Choice Question (MCQ) of Electronics page-15:211. b) Internal faults c) Number of ampere turns Due to unequal torques at two ends of the beam, it starts rotating against the hinge and ultimately closes the contacts of the relay. Normally a Time Setting Dial is provided which is calibrated from 0 to 1 s in step of 0.05 s. 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. 9. b) 2r ɸ motor b) Conductors Burden of a protective relay is the power. 40. B. 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. 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 « Back CONTENTS Next » 1. An instantaneous relay is. Plug Setting Multiplier and is defined as the ratio of fault current in the relay coil to the pick up value. b) Bound electrons are always present in the semiconductor. C. Ground wire. d) Alloys, Multiple Choice Question (MCQ) of Electronics page-14:196. Freon group of refrigerants are (A) Inflammable (B) … In which of the following device the base resistors are not added in the package but added externally? a) 0.0001 sec b) 0.001 sec c) 0.01 sec d) 0.1 sec Ans: (c) 9. As the current coil is an inductor, there would be a certain delay to reach the current in the coil to its maximum value. b) Overhead line equipment b) Back up stop The Buchholz relay is a gas operated relay used for the protection of oil immersed transformers against all the types of internal faults. d) Every internal faults These time delays are inherent in the instantaneous relay but no other time delay is intentionally added. Passes the frequencies lower than the specified cut off frequency 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. c) Free electrons are always present in the semiconductor. (d) control the fault current. 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. d) None of these Electrical Engineering Interview Questions Question 6. a) Semiconductors d) All of these Over current with extremely inverse characteristics . The conduction in JEFT is always by the a) Majority carriers b) Minority carriers c) Holes Relays for transmission line protection are. 1. d) All of these c) Alternator The relay must work efficiently to trip the circuit breakers if there are faults present. 1.A single phasing relay can be used with, a) 1ɸ motor a. The function of this relay is very fast. Dec 27,2020 - Power Systems - MCQ Test 2 | 20 Questions MCQ Test has questions of GATE preparation. Ans: (c), a) Equal to voltage element torque (of a relay) A term for contact operation (opening or closing) as a relay just departs from pickup. b) Non-directional type (b) interrupt the circuit. c) Holes The pickup value is A Relay is generally provided with control to adjust the time of operation of the Relay. Multiple Choice Question (MCQ) of Electronics page-13:181. d) All of these c) 3 ɸ motor C. Rms value. Multiple Choice Question (MCQ) of Electronics page-13:181. 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. Decreased stability of the power system. 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. Define Plug Setting Multiplier? j. Such as, attracted armature relay where an iron plunger is attracted by an electromagnet to actuate the relay. c) Reactance type Threshold characteristics of a plain impedance relay in a complex Z plane is a . 23. Ans: (b), a) Inter-turn fault If the faults are severe it disconnects the transformer from the supply. A circuit breaker is a device used to (a) limit the current. 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. A. 2. These MCQs are often included in competitive exams, university tests, job interviews, and tests. 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. c) Unidirectional type For the protection of a very long extra high voltage line, the protective relay used is . Ans: (b). What is protective relay? Explanation:-MHO relay is a high-speed relay and is also known as admittance relay. 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. Percentage differential relay. c) Both (a) and (b) The materials whose electrical conductivity is usually less than 1 × 106 mho/m are More specifically ideally there is no time required to operate the relay. a. (d) none of the above. Multiple Choice Question (MCQ) of Electronics page-16:226. Multiple Choice Question (MCQ) of Electronics page-17:241. Which of the following statement is true? Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a 25. An instantaneous relay is one in which there is no time delay provided intentionally. Short Questions and Answers on Angle Modulation (FM and PM) Q.1. C. Reactance type distance relay . A. The transient voltage that appears across the circuit breaker contacts at the instant of arc extinction. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? b) Minority carriers Which of the following statement is correct? Although there is some time delay which can not be avoided. Therefore f max = 150Hz Nyquist rate = 2 f max = 2 * 150 = 300Hz. More specifically ideally there is no time required to operate the 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. Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a. The slow developing faults called incipient faults in the transformer tank below oil level operate Buchholz relay which gives an alarm. This test is Rated positive by 85% students preparing for GATE.This MCQ test is related to GATE syllabus, prepared by GATE teachers. a) The saturation voltage VCF of silicon transistor is more than germanium transistor. (c) detect the fault current. Instantaneous overcurrent relay. Economics of Operation page-2, Objective Type Question or MCQ of B. In […] Although there is some time delay which can not be avoided. b) 0.001 sec Instantaneous relay is. 13) A low pass filter is. Ans: (b), a) Air gap 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. 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Ans. Long Transmission Line. d) Electrons 8. What is meant by “Relay Settings”? D. Mho type distance relay For example, dropout ratio of a typical instantaneous overvoltage relay is 90 percent. These relays can be operated in less than 0.1 sec. When current in the solenoid crosses pick up value, the solenoid attracts an iron plunger which moves to close the relay contacts. d) 0.1 sec d) Motors d) The saturation voltage VCE for silicon transistor is lower than germanium transistor. Also identifies the maximum value of an input quantity that will allow the relay to depart from pickup. Required to operate the circuit breaker. c) Less than voltage element torque Ans: (a), a) Load 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) Permanent moving magnet b) Induction cup c) Shaded pole d) Moving coil Ans: (a) 18. c) Rotor faults Economics of Operation page-3, Objective Type Question or MCQ of B. (c) full load. 3. b) MHO type

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