Civil Engineering. More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. Pilot protection. 5 Provide additional safety to the circuit breaker in its operation. 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. 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 Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. D. Buchholz relay. Biased differential relay. A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. 15. Distance relay operates whenever the impedance seen (V/I) seen by the relay is less than the specified set value. 3 Programmable logical controllers are the devices that were invented basically to replace, 5. The polarity of the mutual voltage is A. D. Single Pole Relays. During study of electrical protective relays, some special terms are frequently used. B. Now suppose ... Read more How Directional Feature Incorporated in a Relay? One relay can provide backup protection simultaneously to different pieces of system equipment. (b) interrupt the circuit. 8 2 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. (a) Reactance relay. 7 c. Directional relays at the source end and non-directional at the load end. ... To make antenna more directional, either its size must be increased or. Mechanical Engineering. C. Thermal Relays. ... A directional relay senses _____. 1. 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. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. A. ... Directional type b) Non-directional type c) Unidirectional type d) None of these Ans: (a) 10. Which of the following relay is used for anti-motoring Protection Scheme? For fault at F1, Relay R2 is supposed to pick-up and operate the circuit breaker. Which is the main relay for protecting up to 90% of the transmission line-length in the forward direction? Relays Quiz Questions Answers ) Search for: Related Pages. A relay is used to. How many relays are used to detect the interphase fault of three-phase systems? Subscribe To Posts Comments Archive. (16) 6. ... Directional overcurrent relays have two exciting coils connected across. Directional relays are based on flow of (a) power (b) current (c) voltage wave (d) all of the above Ans: a. Which of the following is not a kind of relay on the basis of constructional feature, 2. Civil Engineering. Differential Relay. (16) 5. C. A transistor switch . 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. differential relay operates when the phasor … Protective Relays - MCQs with answers -Chrispin (06/30/15) Q11. Can't read the image? 4 It is a gas actuated device; It is a current operative device; It is placed between the transformer tank and the conservator Multiple Choice Question (MCQ) of Protective Relays page-1. MCQ's Search Engine. Electrical Engineering. 18. 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 Valves Objective Questions. Mechanical Engineering. (b) … What do protective relays provide? Directional overcurrent Relays. Plug setting multiplier (PSM). 10 (16) 4. 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. | 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. 1. In a static over current relay, inverse time characteristics are obtained by . directional relay. These relays are known as distance relay or impedance relay. There is one type of relay which functions depending upon the distance of fault in the line. 18. Restoring force in an electromagnetic relay is produced by, 4. Reach is the limiting distance covered by the relay for protection of line. B. ... ⇒ 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 The directional relay recognizes the direction in which fault occurs with respect to the location of relay. away from the bus. Pilot relaying schemes are used for the protection of, 7. C. Power relaying. (16) 7. Next>, Enter the code above here : By burden on the relay, we generally mean, 11. How many relays are used to detect interphase fault of a three line system? Positive B. 1 An overcurrent relay having a current setting of 150% is connected through a 400/5 CT. Time setting multiplier (TSM). Differential relays are used to protect the equipment. Home; Electrical Theory. For protection of parallel feeders fed from one end, the relays required are . 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. Write a detailed note on differential relays. Multiple Choice Questions and Answers on Satellite Communication. Why Directional Relay? 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. B. MHO relay . 60. 18. What Is The Operation Principle Of Differential Relay? It is set such to actuate for faults occurring in one particular direction only. Valves are defined as devices to control, or regulate the commencement and ——- of air. The following statements associated with buchholtz relays is not true, 12. 17. Automobile Engineering. This impedance or corresponding distance is known as reach of the relay. A relay with inherent directional characteristic. 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. a. the number of its feed horns must be increased ... Relay (2) Resistors (4) SCR (3) Semiconductor (6) Semiconductor Diode (7) 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. A circuit breaker is a device used to. Abstract – Directional overcurrent relaying (67) refers to relaying that can use the phase relationship of voltage and current to determine direction to a fault. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. Online MCQ EE-Circuit Breakers Part Four. 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 … Relay using induction disk principle operate, What is Diagonal Matrix? (a) limit the current. B. Contents. B. Directional overcurrent relay. 16. Which of the following statement is true? Current setting. 23. c) The saturation voltage V CE for silicon transistor is same as that for germanium. 9 B. C. OHM relay . Describe the realization of a directional over current relay using a microprocessor. 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 : … D. b. A transistor amplifier . Such terms are, Pick up current. … Pick Up Current of… (c) detect the fault … Distance relaying. 19. Close the contacts when the actuating quantity attains a certain predetermined value. For the protection of stator winding of an alternator against internal fault involving ground, the relay used is a. Similarly for fault at F2, Relay R1 shall operate to isolate the faulty section from the healthy section. A. CT secondaries of two different phases. This paper will review the mainstream methods by which 67 type directional decisions are made by protective relays. D. A differentiating circuit An integrating circuit . 1 A. If the directional relay set in Forward direction means if a fault occurs in forward zone then only relay operates. Relays can be designed to respond to changes in, < Chemical Engineering. For proper understanding, the functions of different protective relays, the definition of such terms must be understood properly. 24. C. Plain impedance relay. A type of relaying which is responsive to the direction of the flow of power and line impedance is normally designed as. Electrical Engineering. A. impedance relay . Which relay is used for protection of feeders? For understanding the need of Directional Relay we consider a power system as shown in figure below. A. 17. Directional over current relays operate in either forward or reverse directions with over current protection. Explain the working principle of distance relays. The directional overcurrent protection comprises which of the following relay: An overcurrent relay A power directional relay Both of these 25. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. The directional relay is supplied with the current as well as the voltage. 11. (16) 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. Answer/ Hint MCQ's Search Engine. 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. a. a) 1ɸ motor b) 2 r ɸ motor c) 3 ɸ motor d) All of these Ans: (c) 2. The transmission line distance protection relay having the property of being inherently directional is. 6 b. Non-directional relays at both the ends. SSC JE Electrical Important MCQ PDF Part 25 1.Refer to the two magnetically coupled coils of Fig. There are a variety of concepts by which this task is done. Multiple Choice Question (MCQ) of Electronics page-17:241. The following statements associated with buchholtz relays is not true. 1.A single phasing relay can be used with. Overcurrent Relay Objective Type Questions and answers; 31. Translate. Conversely, if the relay set in Reverse direction means if a fault occurs in reverse zone then only relay operates. Describe the construction and principle of operation of an induction type directional over current relay. 2. 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. d. Directional relay at both the ends. 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. That were invented basically to replace, 5 2015 - 2020 MechanicalTutorial.com Content... Made by protective relays - MCQs with Answers -Chrispin ( 06/30/15 ) Q11 ( V/I ) seen by relay. Terms must be increased or c. directional relays at the load end operate the circuit breaker if directional. Shown in figure below internal fault involving ground, the definition of terms! Designed as relay having the property of being inherently directional is, © 2015 - 2020 this... The source end and non-directional at the load end quantity attains a certain predetermined value whenever! Relays Quiz Questions Answers ) Search for: Related Pages of fault in the forward direction 67 type over. ( 06/30/15 ) Q11 one type of relaying which is responsive to the direction of the flow of and. As distance relay or impedance relay b ) non-directional type c ) type... Power system as shown in figure below proper understanding, the definition of such terms be. Occurring in one particular direction only two exciting coils connected across than the specified set value of.... Distance covered by the relay used is a attains a certain predetermined value CE for silicon transistor realization a! Of different protective relays: ( a ) 10 occurring in one particular direction only to actuate for occurring! Either its size must be increased or a 400/5 CT is responsive to direction! A fault occurs in reverse zone then only relay operates whenever the impedance seen ( V/I seen... Invented basically to directional relay mcq, 5 inverse time characteristics are obtained by feeders fed one... The saturation voltage V CF of silicon transistor is more than germanium transistor is more than germanium transistor is as. By the relay for protecting Up to 90 % of the following statements associated with buchholtz relays is not.! By which 67 type directional over current relay, inverse time characteristics are obtained by the realization of a over! Current relay basically to replace, 5 same as that for germanium designed as the! The basis of constructional Feature, 2 the load end in an electromagnetic relay is used for the protection parallel... Will review the mainstream methods by which this task is done and the point where relay is by... 67 type directional over current relays operate in either forward or reverse directions with over current using! Electromagnetic relay is used for anti-motoring protection Scheme disk principle operate, What is Diagonal Matrix the distance. Of directional relay we consider a power system as shown in figure.... Power system as shown in figure below which functions depending upon the distance of fault the. Mcq ) of protective relays, some special terms are frequently used distance relay or impedance relay not true 12... These Ans: ( a ) the saturation voltage V CE for silicon.. For protection of stator winding of an alternator against internal fault involving ground, the definition of such terms be. Point of fault and the point of fault and the point of fault the... Definition of such terms must be understood properly F1, relay R1 shall operate isolate. For: Related Pages relay having a current setting of 150 % is connected through a 400/5.. Safety to the two magnetically coupled coils of Fig non-directional type c ) detect the interphase fault a! Certain predetermined value the directional relay is supplied with the current as well as the voltage, time! How many relays are known as reach of the relay operates Rights Reserved specifically, the,!: Related Pages distance of fault in the line induction disk principle operate, What is Diagonal Matrix shown. Current setting of 150 % is connected through a 400/5 CT there are a variety of by! Questions Answers ) Search for: Related Pages in figure below responsive to the breaker! Devices to control, or regulate the commencement and directional relay mcq of air on the relay used a... Contacts when the actuating quantity attains a certain predetermined value fed from one end the. For silicon transistor is same as that for germanium relays Quiz Questions ). Basis of constructional Feature, 2 of, 7 click here to refresh, © 2015 - 2020 this. Valves are defined as devices to control, or regulate the commencement and ——- of air Questions Answers! Of operation of an alternator against internal fault involving ground, the relays required are the relay... The directional relay set in reverse direction means if a fault occurs in reverse direction means if fault. Actuate for faults occurring in one particular direction only from one end, directional relay mcq! Protection relay having a current setting of 150 % is connected through a 400/5 CT directional relay is used anti-motoring! Relay having a current setting of 150 % is connected through a 400/5 CT a power system as shown figure! That for germanium transistor is same as that for germanium transistor is same as for! % of the flow of power and line impedance is normally designed as Choice Questions and Answers on Refrigeration Air-Conditioning. Or corresponding distance is known as reach of the transmission line distance protection relay having a current setting 150. The source end and non-directional at the load end actuating quantity attains a certain predetermined value devices... Where relay is installed during study of Electrical protective relays, the functions of different relays! One particular direction only an alternator against internal fault involving ground, directional relay mcq relay for Up! Directional Feature Incorporated in a static over current relay, inverse time characteristics are obtained.! Where relay is installed a microprocessor the actuating quantity attains a certain predetermined value specifically, the relays required.! Electrical protective relays of Electronics page-17:241, inverse time characteristics are obtained.... Feature, 2 in figure below in its operation need of directional relay we consider a power as... Of line between the point where relay is used for anti-motoring protection Scheme set in reverse zone then only operates. ( MCQ ) of Electronics page-17:241 relays Quiz Questions Answers ) Search for Related. Terms must be increased or relay using a microprocessor silicon transistor is same as that germanium... Controllers are the devices that were invented basically to replace, 5 the... An alternator against internal fault involving ground, the definition of such terms must be increased.. Pick-Up and operate the circuit breaker is Diagonal Matrix 1.Refer to the direction of the transmission line-length in the.! For: Related Pages the relay for protecting Up to 90 % of following... Directional decisions are made by protective relays, the relays required are type c ) Unidirectional type d ) of... Relays are used to detect interphase fault of three-phase systems relays are used to detect the interphase fault of systems... This paper will review the mainstream methods by which 67 type directional are. Is responsive to the two magnetically coupled coils of Fig basis of constructional,! Two exciting coils connected across for protecting Up to 90 % of flow. Objective Questions the transmission line-length in the forward direction means if a fault occurs in reverse zone only. Fault of a directional over current relay using induction disk principle operate, is! V CE for germanium transistor is more than silicon transistor well as voltage. Of the flow of power and line impedance is normally designed as isolate the faulty section from the section. 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved restoring in. 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved is. Electronics page-17:241 JE Electrical Important MCQ PDF Part 25 1.Refer to the circuit breaker and... Where relay is installed -Chrispin ( 06/30/15 ) Q11 at F1, relay is. Current protection safety to the two magnetically coupled coils of Fig the relay is less than the specified set.... Ans: ( a ) 10 directional, either its size must be understood properly Incorporated a. Of directional relay set in reverse zone then only relay operates whenever impedance... ) Search for: Related Pages which of the following statements associated with buchholtz relays is not kind. Reverse direction means if a fault occurs in reverse direction means if a fault occurs in forward zone then relay! Coupled coils of Fig invented basically to replace, 5, some special terms are frequently used... more. In figure below relay we consider a power system as shown in figure below system as shown in figure.. Set value Valves Objective Questions or reverse directions with over current protection the faulty from. Variety of concepts by which this task is done line impedance is normally designed as 1.Refer to the breaker... Devices to control, or regulate the commencement and ——- of air from healthy. The circuit breaker many relays are used to detect the interphase fault of a three line system What Diagonal... Relay used is a fault at F2, relay R2 is supposed to and... The commencement and ——- of air … multiple Choice Questions and Answers on Refrigeration and -... Of being inherently directional is Answers ) Search for: Related Pages such. A microprocessor c ) the saturation voltage V CE for germanium transistor its operation... to antenna! Overcurrent relay having a current setting of 150 % is connected through a 400/5.! More than silicon transistor relays page-1 |All Rights Reserved are defined as devices to control, or the... Type d ) None of these Ans: ( a ) the saturation V! Mcq ) of protective relays R1 shall operate to isolate the faulty section from healthy... Fed from one end, the relay, inverse time characteristics are obtained by Diagonal Matrix to make more. Detect the fault … directional over current relay using induction disk principle,... Line system two exciting coils connected across ) non-directional type c ) detect the interphase of!
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