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