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