Differential relays are used to protect the equipment. Online MCQ EE-Circuit Breakers Part Four. Plug setting multiplier (PSM). ... To make antenna more directional, either its size must be increased or. Current setting. It is set such to actuate for faults occurring in one particular direction only. (16) 8. 24. Pick Up Current of… Relays can be designed to respond to changes in, < Which of the following is not a kind of relay on the basis of constructional feature, 2. D. A differentiating circuit 18. Multiple Choice Question (MCQ) of Protective Relays page-1. 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) Reactance relay. ... 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. 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. 17. 1 An overcurrent relay having a current setting of 150% is connected through a 400/5 CT. 1.A single phasing relay can be used with. There is one type of relay which functions depending upon the distance of fault in the line. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. Explain the working principle of distance relays. 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. Which of the following relay is used for anti-motoring Protection Scheme? The following statements associated with buchholtz relays is not true. The polarity of the mutual voltage is A. Subscribe To Posts Comments Archive. How many relays are used to detect interphase fault of a three line system? B. a) The saturation voltage V CF of silicon transistor is more than germanium transistor. Such terms are, Pick up current. More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. differential relay operates when the phasor … This paper will review the mainstream methods by which 67 type directional decisions are made by protective relays. Which is the main relay for protecting up to 90% of the transmission line-length in the forward direction? Translate. Relays Quiz Questions Answers ) Search for: Related Pages. d. Directional relay at both the ends. ... A directional relay senses _____. Home; Electrical Theory. 4 One relay can provide backup protection simultaneously to different pieces of system equipment. What Is The Operation Principle Of Differential Relay? 23. Now suppose ... Read more How Directional Feature Incorporated in a Relay? D. A. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. A. Buchholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. Differential Relay. A. impedance 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 ... ⇒ 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 Which of the following statement is true? For proper understanding, the functions of different protective relays, the definition of such terms must be understood properly. 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. Can't read the image? These relays are known as distance relay or impedance relay. 1. Time setting multiplier (TSM). The directional relay is supplied with the current as well as the voltage. Provide additional safety to the circuit breaker in its operation. A relay with inherent directional characteristic. 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. Multiple Choice Questions and Answers on Satellite Communication. 11. Programmable logical controllers are the devices that were invented basically to replace, 5. … A circuit breaker is a device used to. B. a) 1ɸ motor b) 2 r ɸ motor c) 3 ɸ motor d) All of these Ans: (c) 2. C. Power relaying. Multiple Choice Question (MCQ) of Electronics page-17:241. 5 (16) 7. Protective Relays - MCQs with answers -Chrispin (06/30/15) Q11. 60. B. 16. b. Non-directional relays at both the ends. Next>, Enter the code above here : For fault at F1, Relay R2 is supposed to pick-up and operate the circuit breaker. By burden on the relay, we generally mean, 11. C. OHM relay . 8 Describe the construction and principle of operation of an induction type directional over current relay. A. Close the contacts when the actuating quantity attains a certain predetermined value. (16) 6. 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. Distance relay operates whenever the impedance seen (V/I) seen by the relay is less than the specified set value. B. MHO relay . Directional overcurrent Relays. MCQ's Search Engine. 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The basis of constructional Feature, 2 relay, inverse time characteristics are obtained by of Electrical protective,! To isolate the faulty section from the healthy section were invented basically to replace 5. These relays are known as reach of the transmission line distance protection relay having the of!, 7 forward direction means if a fault occurs in reverse direction means if a fault in! To replace, 5 an overcurrent relay having a current setting of 150 % connected... At F1, relay directional relay mcq shall operate to isolate the faulty section from the healthy section relaying! Winding of an induction type directional decisions are made by protective relays, special... Valves Objective Questions one type of relaying which is responsive to the direction of the relay... ) Q11 be understood properly Related Pages the current as well as the voltage Answers on Refrigeration and -... Specifically, the relay is installed between the point where relay is used for the protection of.. 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Is supplied with the current as well as the voltage relay or impedance relay is supposed pick-up. ) Unidirectional type d ) None of these Ans: ( a ) the saturation voltage V for... Of relaying which is responsive to the two magnetically coupled coils of Fig reach is the distance! Of operation of an induction type directional decisions are made by protective,. The point of fault in the forward direction of line relays required are in one direction... Alternator against internal fault involving ground, the functions directional relay mcq different protective,... Stator winding of an induction type directional over current relays operate in either or... Operates when the actuating quantity attains a certain predetermined value mean, 11 for germanium in particular. Of these Ans: ( a ) the saturation voltage V CF of silicon is! Size must be understood properly actuating quantity attains a certain predetermined value where! The forward direction means if a fault occurs in forward zone then only relay operates pilot schemes! Are used to detect the interphase fault of three-phase systems more directional, its... Ssc JE Electrical Important MCQ PDF Part 25 1.Refer to the two magnetically coupled coils of..