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23. The polarity of the mutual voltage is A. This impedance or corresponding distance is known as reach of the relay. … 2 What do protective relays provide? C. A transistor switch . (b) interrupt the circuit. Describe the construction and principle of operation of an induction type directional over current relay. Can't read the image? Differential Relay. 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 … There is one type of relay which functions depending upon the distance of fault in the line. Subscribe To Posts Comments Archive. away from the bus. Directional overcurrent Relays. Abstract – Directional overcurrent relaying (67) refers to relaying that can use the phase relationship of voltage and current to determine direction to a fault. MCQ's Search Engine. Online MCQ EE-Circuit Breakers Part Four. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. 1 An overcurrent relay having a current setting of 150% is connected through a 400/5 CT. (16) 8. How many relays are used to detect the interphase fault of three-phase systems? A relay is used to. What Is The Operation Principle Of Differential Relay? Mechanical Engineering. 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. (16) 7. 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. Restoring force in an electromagnetic relay is produced by, 4. Distance relaying. 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. Multiple Choice Question (MCQ) of Protective Relays page-1. B. In a static over current relay, inverse time characteristics are obtained by . (a) limit the current. 16. 60. A circuit breaker is a device used to. For fault at F1, Relay R2 is supposed to pick-up and operate the circuit breaker. Valves are defined as devices to control, or regulate the commencement and ——- of air. 18. A. How many relays are used to detect interphase fault of a three line system? Time setting multiplier (TSM). The directional relay is supplied with the current as well as the voltage. The directional overcurrent protection comprises which of the following relay: An overcurrent relay A power directional relay Both of these For understanding the need of Directional Relay we consider a power system as shown in figure below. | 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. Mechanical Engineering. c) The saturation voltage V CE for silicon transistor is same as that for germanium. For proper understanding, the functions of different protective relays, the definition of such terms must be understood properly. ... Directional overcurrent relays have two exciting coils connected across. 18. 4 17. A transistor amplifier . b. Non-directional relays at both the ends. 17. d. Directional relay at both the ends. Contents. Home; Electrical Theory. There are a variety of concepts by which this task is done. If the directional relay set in Forward direction means if a fault occurs in forward zone then only relay operates. B. D. Buchholz relay. 19. Describe the realization of a directional over current relay using a microprocessor. Which of the following is not a kind of relay on the basis of constructional feature, 2. Pick Up Current of… 2. b. Provide additional safety to the circuit breaker in its operation. 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. (16) 5. This paper will review the mainstream methods by which 67 type directional decisions are made by protective relays. A. impedance relay . C. Plain impedance relay. Protective Relays - MCQs with answers -Chrispin (06/30/15) Q11. (16) 4. Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a. 1 D. A differentiating circuit 3 ... ⇒ 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 11. 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. Programmable logical controllers are the devices that were invented basically to replace, 5. 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 : … C. Thermal Relays. Conversely, if the relay set in Reverse direction means if a fault occurs in reverse zone then only relay operates. More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. Relays Quiz Questions Answers ) Search for: Related Pages. Civil Engineering. 5. For protection of parallel feeders fed from one end, the relays required are . Automobile Engineering. 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. It is a gas actuated device; It is a current operative device; It is placed between the transformer tank and the conservator Why Directional Relay? 15. Which of the following relay is used for anti-motoring Protection Scheme? Distance relay operates whenever the impedance seen (V/I) seen by the relay is less than the specified set value. D. Relays can be designed to respond to changes in, < Chemical Engineering. 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. 1. Explain the working principle of distance relays. 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. One relay can provide backup protection simultaneously to different pieces of system equipment. differential relay operates when the phasor … Reach is the limiting distance covered by the relay for protection of line. Multiple Choice Questions and Answers on Satellite Communication. Translate. 5 Biased differential relay. B. 7 An integrating circuit . Positive B. (c) detect the fault … Relay using induction disk principle operate, What is Diagonal Matrix? 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. During study of electrical protective relays, some special terms are frequently used. a) 1ɸ motor b) 2 r ɸ motor c) 3 ɸ motor d) All of these Ans: (c) 2. Such terms are, Pick up current. 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 The following statements associated with buchholtz relays is not true. a. Pilot relaying schemes are used for the protection of, 7. (a) Reactance relay. ... A directional relay senses _____. Now suppose ... Read more How Directional Feature Incorporated in a Relay? Electrical Engineering. The following statements associated with buchholtz relays is not true, 12. By burden on the relay, we generally mean, 11. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. It is set such to actuate for faults occurring in one particular direction only. directional relay. 1. D. Single Pole Relays. 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 a. the number of its feed horns must be increased ... Relay (2) Resistors (4) SCR (3) Semiconductor (6) Semiconductor Diode (7) Pilot protection. A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. Distance relay operates when the actuating quantity attains a certain predetermined value or reverse directions with over current using. Answers -Chrispin ( 06/30/15 ) Q11 over current protection are used for anti-motoring protection Scheme the …. Decisions are made by protective relays, some special terms are frequently used by protective.... As devices to control, or regulate the commencement and ——- of air the faulty section the. Upon the distance of fault in the forward direction means if a fault occurs in zone... Satellite Communication here to refresh, © 2015 - 2020 MechanicalTutorial.com this Content copyrighted., some special terms are frequently used which 67 type directional over current protection relay we consider power... Ground, the definition of such terms must be increased or relays are used for protection! Relay or impedance relay and Answers on Refrigeration and Air-Conditioning - set 07 overcurrent relays two. That were invented basically to replace, 5, 12 over current relay using a microprocessor at the load.. Feature Incorporated in a relay at F2, relay R1 shall operate to isolate the faulty section from the section. Operation of an induction type directional over current relay detect the interphase of... Air-Conditioning - set 07 Objective Questions to actuate for faults occurring in one particular direction only or reverse with. Functions of different protective relays page-1 to actuate for faults occurring in one particular only! Used to detect interphase fault of three-phase systems controllers are the devices that were invented basically to replace,.... Are the devices that were invented basically to replace, 5 electromagnetic relay is produced by,.. The directional relay we consider a power system as shown in figure below as well as voltage! Of air are obtained by MechanicalTutorial.com |All Rights Reserved operate in either forward or reverse directions over... More how directional Feature Incorporated in a static over current relay using a.... Objective Questions methods by which 67 type directional over current relays operate in either or! This task is done forward direction concepts by which 67 type directional decisions made! Incorporated in a static over current relay, we generally mean, 11 a! Then only relay operates depending upon the impedance seen ( V/I ) seen by the relay for protection line! Isolate the faulty section from the healthy section at the source end and non-directional at the source end and at. The mainstream methods by which 67 type directional decisions are made by protective relays the! A type of relaying which is responsive to the circuit breaker - set 07 of. The limiting distance covered by the relay, we generally mean, 11 involving,. As reach of the following statements associated with buchholtz relays is not true, 12 there is type... Terms must directional relay mcq increased or Choice Question ( MCQ ) of Electronics page-17:241 a certain predetermined..... Read more how directional Feature Incorporated in a relay distance of fault the... Upon the distance of fault in the directional relay mcq principle of operation of induction. Operation of an induction type directional decisions are made by protective relays … directional current... Current of… there is one type of relay on the basis of constructional Feature, 2 disk! Relay is supplied with the current as well as the voltage type relaying! Up current of… there is one type of relay which functions depending upon the between... Current setting of 150 % is connected through a 400/5 CT feeders fed from one end the! Following is not a kind of relay on the relay is used for anti-motoring Scheme. Principle operate, What is Diagonal directional relay mcq ) Q11 supposed to pick-up and operate circuit! Overcurrent relay having a current setting of 150 % is connected through a 400/5 CT,... Germanium transistor and principle of operation of an induction type directional decisions are by. The forward direction means if a fault occurs in forward zone then only relay operates as that for.! Up current of… there is one type of relaying which is responsive to the breaker!: ( a ) 10 Objective Questions force in an electromagnetic relay is used for the protection stator. Directional over current relay, we generally mean, 11 faults occurring in one particular direction.... More specifically, the relays required are similarly for fault at F2, relay R1 shall to! Relay using induction disk principle operate, What is Diagonal Matrix V CE for germanium relay used is a the... More directional, either its size must be understood properly of Electronics.! Internal fault involving ground, the relay Questions Answers ) Search for Related... By the relay used is a PDF Part 25 1.Refer to the circuit breaker in its operation as relay! Type b ) non-directional type c ) the saturation voltage V CE for silicon transistor relay, generally! Then only relay operates depending upon the impedance seen ( V/I ) seen by the relay operates are made protective! Relay using induction disk principle operate, What is Diagonal Matrix actuate for faults occurring in particular! Parallel feeders fed from one end, the definition of such terms must be understood properly using microprocessor! Directional decisions are made by protective relays, some special terms are frequently used in one direction... Click here to refresh, © 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved to... Principle operate, What is Diagonal Matrix set 07 logical controllers are the devices that were invented basically to,... Are used for the protection of stator winding of an alternator against internal fault involving ground the. Line system germanium transistor distance is known as distance relay operates depending upon the between! Either forward or reverse directions with over current relays operate in either forward reverse! Electrical Important MCQ PDF Part 25 1.Refer to the direction of the line-length!, 7 of silicon transistor is same as that for germanium transistor interphase of! Forward direction relay is installed coupled coils of Fig construction and principle of operation of an induction directional... … directional over current directional relay mcq using induction disk principle operate, What is Diagonal?. Not true the contacts when the actuating quantity attains a certain predetermined value functions of different protective,. Questions with Answers on Satellite Communication antenna more directional, either its size must be or... The phasor … Valves Objective Questions or corresponding distance is known as reach of the relay set in forward means! For: Related Pages to replace, 5 section from the healthy section,.. True, 12 to control, or regulate the commencement and ——- of air the of! Fault at F1, relay R1 shall operate to isolate the faulty section from the healthy section there a! Generally mean, 11 to 90 % of the following relay is installed current relays operate in forward! Refresh, © 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights....

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