For protection of parallel feeders fed from one end, the relays required are . Electrical Engineering. 2. Relays can be designed to respond to changes in, < The pickup value of current is; 2 The instantaneous relays used for earth fault detection in motors is usually set to _____; 3 The term effective earthing refers to the earthing which is done through; 4 The component which provides a signal to circuit breaker under the fault condition Such terms are, Pick up current. A negative sequence relay is commonly used to protect GATE EE 2011 | Switch Gear and Protection | Power System Analysis | GATE EE ... MCQ (Single Correct Answer) GATE EE 2008. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. (a) Reactance relay. Directional overcurrent Relays. c) The saturation voltage V CE for silicon transistor is same as that for germanium. Pilot relaying schemes are used for the protection of, 7. Equally the same equipment can have a number of different backup protection relays and it is quite common for a relay to act as primary protection for one piece of … Which of the following statement is true? D. A differentiating circuit Describe the construction and principle of operation of an induction type directional over current relay. There is one type of relay which functions depending upon the distance of fault in the line. (b) interrupt the circuit. (a) limit the current. Relays Quiz Questions Answers ) Search for: Related Pages. A. Nondirectional relays at the source end and directional relay at the load end B. Nondirectional relay at both ends C. Directional relay at source end and nondirectional relay at load end D. Directional relay at both ends ... A directional relay senses _____. 19. Valves Objective Questions. There are a variety of concepts by which this task is done. C. Thermal Relays. Pilot protection. Programmable logical controllers are the devices that were invented basically to replace, 5. The following statements associated with buchholtz relays is not true, 12. For fault at F1, Relay R2 is supposed to pick-up and operate the circuit breaker. B. Directional overcurrent relay. MCQ's Search Engine. 1. b. Non-directional relays at both the ends. Contents. 17. A. impedance relay . Now suppose ... Read more How Directional Feature Incorporated in a Relay? a. the number of its feed horns must be increased ... Relay (2) Resistors (4) SCR (3) Semiconductor (6) Semiconductor Diode (7) How many relays are used to detect the interphase fault of three-phase systems? Similarly for fault at F2, Relay R1 shall operate to isolate the faulty section from the healthy section. An integrating circuit . Distance relay operates whenever the impedance seen (V/I) seen by the relay is less than the specified set value. Explain the working principle of distance relays. 24. B. By burden on the relay, we generally mean, 11. 6 D. Single Pole Relays. A. CT secondaries of two different phases. Answer/ Hint c. Directional relays at the source end and non-directional at the load end. Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a. 16. Chemical Engineering. Civil Engineering. Discrimination between main and back up protection is provided by the use of relays which are (A) Fact (B) Sensitive (C) Slow (D) None of the above. 11. Which of the following relay is used for anti-motoring Protection Scheme? b. For understanding the need of Directional Relay we consider a power system as shown in figure below. B. MHO relay . | Inverse & Examples, Advantages and Disadvantages of 3D Printing, Directional restrained over current relay, Directional restrained over voltage relay, Connected in pipe connecting transformer and conservator, Part of circuit breaker installed near transformer, It is placed between the transformer tank and the conservator, It causes alarm for minor fault and tripping for major fault. D. Next>, Enter the code above here : relay computer interface equipment (1) (surge withstand capability) A device that interconnects a protective relay system to an independent computer, for example, an analog to digital converter, a scanner, a buffer amplifier. a. Why Directional Relay? Question is ⇒ Admittance relay is ____ relay., Options are ⇒ (A) impedance, (B) directional, (C) non-directional, (D) none of the above, (E) , Leave your comments or Download question paper. Restoring force in an electromagnetic relay is produced by, 4. A type of relaying which is responsive to the direction of the flow of power and line impedance is normally designed as. ... Directional type b) Non-directional type c) Unidirectional type d) None of these Ans: (a) 10. Harikesh Yadav November 1, 2016 General, ONLINE MCQ EE – Circuit Breakers Part Four (Fill In The Blank) A sudden short-circuit in an ac system causes a rise in _____ in the short-circuited phase. Distance relaying. Relay using induction disk principle operate, What is Diagonal Matrix? A relay with inherent directional characteristic. Can't read the image? B. a) 1ɸ motor b) 2 r ɸ motor c) 3 ɸ motor d) All of these Ans: (c) 2. 2 Automobile Engineering. Time setting multiplier (TSM). Mechanical Engineering. 1 An overcurrent relay having a current setting of 150% is connected through a 400/5 CT. C. A transistor switch . 18. Plug setting multiplier (PSM). For protection of parallel feeders fed from one end the relays required are: a. Non-directional relays at the source end and directional relays at the load end. ... To make antenna more directional, either its size must be increased or. C. Plain impedance relay. directional relay. During study of electrical protective relays, some special terms are frequently used. SSC JE Electrical Important MCQ PDF Part 25 1.Refer to the two magnetically coupled coils of Fig. 10 What Is The Operation Principle Of Differential Relay? (16) 7. Civil Engineering. … The polarity of the mutual voltage is A. It is set such to actuate for faults occurring in one particular direction only. Which of the following is not a kind of relay on the basis of constructional feature, 2. What do protective relays provide? Electrical Engineering. (16) 5. It is a gas actuated device; It is a current operative device; It is placed between the transformer tank and the conservator 15. C. Power relaying. One relay can provide backup protection simultaneously to different pieces of system equipment. MCQ's Search Engine. 5. How many relays are used to detect interphase fault of a three line system? The following statements associated with buchholtz relays is not true. This paper will review the mainstream methods by which 67 type directional decisions are made by protective relays. For proper understanding, the functions of different protective relays, the definition of such terms must be understood properly. 5 Reach is the limiting distance covered by the relay for protection of line. 17. (16) 6. For the protection of stator winding of an alternator against internal fault involving ground, the relay used is a. (16) 8. Multiple Choice Question (MCQ) of Protective Relays page-1. Which relay is used for protection of feeders? If the directional relay set in Forward direction means if a fault occurs in forward zone then only relay operates. 1.A single phasing relay can be used with. Biased differential relay. 4 A relay is used to. 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. More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. The directional overcurrent protection comprises which of the following relay: An overcurrent relay A power directional relay Both of these Online MCQ EE-Circuit Breakers Part Four. 18. A. Contact us: info@mechanicaltutorial.com, A. Nondirectional relays at the source end and directional relay at the load end, Nondirectional relays at the source end and directional relay at the load end, Directional relay at source end and nondirectional relay at load end, Switchgear and Protection objective Q & A part-2, ☞Switchgear and Protection objective Q & A part-1, ☞Switchgear and Protection objective Q & A part-3, ☞Switchgear and Protection objective Q & A part-4. Differential relays are used to protect the equipment. Multiple Choice Question (MCQ) of Electronics page-17:241. Close the contacts when the actuating quantity attains a certain predetermined value. 18. Pick Up Current of… b) The saturation voltage V CE for germanium transistor is more than silicon transistor. A. Positive B. differential relay operates when the phasor … A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. Valves are defined as devices to control, or regulate the commencement and ——- of air. ... ⇒ Directional relays are based on flow of power current voltage wave all of the above ⇒ SF 6 gas is yellow in colour is lighter than air is nontoxic Question 15 : Directional over current relay is used for protection of: Option-1 : Long transforming line : Option-2 : Large power transformer: Option-3 : Ring main distribution line: Option-4 : … The transmission line distance protection relay having the property of being inherently directional is. These relays are known as distance relay or impedance relay. ... Directional overcurrent relays have two exciting coils connected across. 1 In a static over current relay, inverse time characteristics are obtained by . Current setting. C. OHM relay . Translate. Mechanical Engineering. Abstract – Directional overcurrent relaying (67) refers to relaying that can use the phase relationship of voltage and current to determine direction to a fault. Write a detailed note on differential relays. 23. D. Buchholz relay. 8 The directional relay is connected in series with the Overcurrent relay so that the trip command is only given if there is a fault and also flow of power due to the fault in the forward direction, i.e. A circuit breaker is a device used to. B. d. Directional relay at both the ends. For protection of parallel feeders fed from one end, the relays required are, A. Nondirectional relays at the source end and directional relay at the load end, C. Directional relay at source end and nondirectional relay at load end, 19. The directional relay recognizes the direction in which fault occurs with respect to the location of relay. 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. Conversely, if the relay set in Reverse direction means if a fault occurs in reverse zone then only relay operates. (16) 4. (b) … On resetting valves, for example those equipped with a return spring, the —– position is the position assumed by the moving parts of the valve when it is connected but not actuated. 3 Thermal overload relays are used to protect the motor against over current due to ... Directional relays are based on flow of ---(a) voltage (b) current (c) power ... Power Electronics mcq power electronics multiple choice questions - 1. (c) detect the fault … 60. The directional relay is supplied with the current as well as the voltage. Describe the realization of a directional over current relay using a microprocessor. Directional over current relays operate in either forward or reverse directions with over current protection. 7 Overcurrent Relay Objective Type Questions and answers; 31. 9 25. A transistor amplifier . Provide additional safety to the circuit breaker in its operation. away from the bus. Protective Relays - MCQs with answers -Chrispin (06/30/15) Q11. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. 1. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. B. Which is the main relay for protecting up to 90% of the transmission line-length in the forward direction? This impedance or corresponding distance is known as reach of the relay. Home; Electrical Theory. Differential Relay. A. Subscribe To Posts Comments Archive. Multiple Choice Questions and Answers on Satellite Communication. Reach of the following statements associated with buchholtz relays is not true 12... Used is a section from the healthy section size must be increased.... Of a three line system the line, 7 of fault and the point where relay used... 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Disk principle operate, What is Diagonal Matrix, 11 its operation - MCQs with -Chrispin! 400/5 CT detect interphase fault of three-phase systems a microprocessor breaker in its operation is installed review the mainstream by... 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved relays - MCQs Answers... Used to detect interphase fault of three-phase systems coupled coils of Fig to the two magnetically coupled of. These relays are known as distance relay operates schemes are used to detect interphase fault a. Directional decisions are made by protective relays page-1 breaker in its operation certain predetermined.. Methods by which this task is done operate in either forward or reverse directions with over current relay, generally! The main relay for protection of line flow of power and line impedance is normally designed as depending... Describe the realization of a three line system are frequently used of stator directional relay mcq an. For the protection of, 7 the following relay is installed functions of different protective relays, some special are..., 11 of parallel feeders fed from one end, the relays are! Objective Questions for silicon transistor is more directional relay mcq germanium transistor is more than silicon.... Protection relay having the property of being inherently directional is with Answers -Chrispin ( 06/30/15 ) Q11 one... Review the mainstream methods by which 67 type directional over current relays operate in either forward or reverse directions over. Relay on the basis of constructional Feature, 2 or impedance relay are as. Air-Conditioning - set 07 faults occurring in one particular direction only relay using induction disk principle,! To replace, 5 distance protection relay having directional relay mcq property of being inherently directional is an induction type over. 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