The impedance relay has a circular characteristic centered at the origin of the R-X diagram. d) no relay is used . An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. 24. a) Impedance type b) MHO type c) Reactance type d) All of these Ans: (b) 7. b) 66 kV – 100 kV. More specifically, the relay operates depending upon the impedance between the point of fault and the point where relay is installed. b) reactance relay. a) 1ɸ motor b) 2 r ɸ motor c) 3 ɸ motor d) All of these Ans: (c) 2. When the power is to be transmitted over a distance of 500 km, the transmission voltage should be in the range. A. (c) IDMT relay. (a) Differential relay. Q8. ... Power Electronics mcq power electronics multiple choice questions - 1. It is used for the protection of a transmission line. a) 33 kV – 66 kV. Reach is the limiting distance covered by the relay for protection of line. Which of the following relay is used to detect and protect internal fault of a transformer? (d) Directional relay. « Back CONTENTS Next » 1. […] (d) external short-circuits and overloads. The admittance relay is the most commonly used distance relay. Multiple Choice Question (MCQ) of Protective Relays page-1. 1. Admittance Relay. Distance Relay. The satellite that is used as a relay to extend communication distance is called as _____ a) Relay satellites b) Communication satellites c) Repeater satellites … Distance relays are generally. It is the tripping relay in pilot schemes and as the backup relay in step distance schemes. A relay used on long transmission lines is. Buchholz relay is used to protect against. Three phase and three earth fault relays Explanation:-Distance relay: A relay which measures impedance or a component of the impedance at the relay location is known as a distance relay. c) impedance relay. 2. (c) internal short-circuits. Which means if the distance Relay senses Impedance less than 25.62 Ohm then it will pick-up for Zone-2. Q6. IDMT relays are used to protect the power transformers against (a) external short-circuits. d) 150kV – 220kV . 1.A single phasing relay can be used with. (b) overloads. In the same manner, Setting for Zone-2 = (150% of 61) × CT/PT ratio = 1.5×61×0.28 = 25.62 ohm. This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Satellite Communication Systems”. For complete protection of a three-phase transmission line, we require . a) mho’s relay. c) 110 kV – 150 kV. There is one type of relay which functions depending upon the distance of fault in the line. (b) Bucholoz relay. Q7. This impedance or corresponding distance is known as reach of the relay. Distance relays are generally-- (a) impedance relays (b) reactance relays (c) split-phase relays (d) none of the above . 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