Test Questionaire In Distribution System

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TEST QUESTIONS IN DISTRIBUTION SYSTEM 1. This is composed of high-voltage transmission line that feed to a medium-voltage network by means of substation. a. line power system c. network power system b. electrical power system. d. transmission system 2. These are used throughout an electrical system and raises the medium-voltage generated by the synchronous generators to the high voltage needed to transmit the energy economically. a. substation c. high transmission-line voltage b step-up generators d. high generator voltage 3. This is reduced in substation located close to the power-consuming centers. a. transmission line voltage c. low transmission line voltage b. line voltage d. high transmission line voltage 4. A medium-voltage substations usually contains the following major components which is not included. a. current-limiting reactors c. capacitors b. disconnect switch d. grounding switches 5. These are designed to interrupt either normal or short current and behave like a big switches that may be opened or closed by locals pushbutton or by distant telecommunication signals emitted by the system of protection. a. circuit breaker c. fuse b. interruption switches d. telecom switch 6. The name on a circuit breaker usually indicate the following which not include. a. The maximum steady state current it carry. c. The interrupting time cycle b. The maximum line voltage d. The maximum interrupting voltage.. 7. _____________________ limits the damage to transmission lines and equipment and it helps to maintain the stability of the system whenever a contingency occurs. a. system protection c. High speed interruption b. break up points d. interruption protectors 8. These are composed of steel tank filled with insulating oil a. oil circuit breaker c. vacuum circuit breakers b SF6 circuit breaker d. air blast breakers

9. This circuit breakers interrupt the circuits by lowing compressed air at supersonic speed across the opening contacts. a. oil circuit breaker c. vacuum circuit breakers b SF6 circuit breaker d. air blast breakers 10. In air blast breakers, compressed air is stored in reservoirs at a pressure of _______ a. 3MPa c.345 psi b. 0.3 MPa d.453 psi 11. These circuit breakers are much \smaller than any other type of circuit breaker of equivalent power and for less noisy than air circuit breaker. a. oil circuit breaker c. vacuum circuit breakers b SF6 circuit breaker d. air blast breakers a. 12. These circuit breaker operates on a different principle from other breaker because there is no gas to ionize when the contacts open. a. oil circuit breaker c. vacuum circuit breakers b SF6 circuit breaker d. air blast breakers 13. The triggering action that causes a circuit breaker to open is usually produced by means of what. a. overload relay c. transmission relay c. underload relay d. NOTA 14. The interrupting time of circuit breaker may last from ________________ of a 60 Hz system. a. 3-5 cycles c. 3-6 cycles b. 3-8 cycles d. 3-7 cycles 15. This is part of an oil circuit breaker where keeps the oil at a satisfactory temperature during cold weather. a. heater c. fixed contact b. current transformers d. moveable contact 16. What will happens when overload occurs in tripping circuit for a circuit breakers. a. the tripping coil is energized by auxiliary source b. tripping will release a powerful spring that pulls on the isolated rod. c. three movable contact actuated simultaneously by an isolated rod. d. the line current for each phase penetrates the tank 17.What will happen when air blast circuit breaker trips a. the rod is driven downward c. the rod is broke b. the compressed air blown out d. the rod is driven upward

18. This circuit breaker is often used underground distribution system. a. oil circuit breaker c. vacuum circuit breakers b SF6 circuit breaker d. air blast breakers 19. Where the compressed air coming form when intensed air is immediately blown out by a jet. a. orifice b. orfise c. orfice d. orfise 20. What causes the relay contacts in a circuit breaker to be closed? a. maximum steady state current c. line current exceeds a preset value b. over voltage d. NOTA

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