13. _______ current attempts to return to the source over any available conductive path. A. Direct B. Alternating C. Ground-fault D. Arc-fault
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13. _______ current attempts to return to the source over any available conductive path.
A. Direct
B. Alternating
C. Ground-fault
D. Arc-fault
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- Discuss causes of insulation failures in high voltage engineering. High voltage engineering13.a. Eddy-current loss in the stator core can be reduced by usingA. alloys with low resistivity.B. annealed iron laminations.C. silicon alloys of copper.D. thin laminations of steel.13.b. Which one of the following is damaging to many insulating materials used in alternators?A. Eddy currentsB. SaturationC. CoronaD. HysteresisCircuit breaker usually operate under A) after D. C. component has ceased B) transient state of short-circuit current C) sub-transient state of short-circuit current D) steady state of short-circuit current
- Write in Briefly about circuit breaker, current transformer and voltage transformerVoltage sags due to short circuit and earth faults are the cause for the vast majority of equipment problems. Electronics equipment become more susceptible to voltage sag, hence the companies experience production stoppages. Voltage sag analysis is very complex issue. Based on voltage sag randon factors describe on it.Q2. The single-line diagram of a simple three-bus power system is shown in Figure-2. Each generator is represented by an emf behind the sub-transient reactance. All impedances are expressed in per unit on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operating on no load at their rated voltage with their emfs in phase. A three-phase fault occurs at bus 3 through a fault impedance of Zf = j0.19 per unit. (i) Using Th'evenin's theorem, obtain the impedance to the point of fault and the fault current in (ii) Determine the bus voltages per unit. ) j0.05 j0.075 j0.75 2 j0.30 j0.45 Figure-2: Single line diagram of the power system network for Q2 3
- how to measure ripple factor for this circuits ?A. Discuss the arcing phenomenon in a circuit breaker. B. Discuss the types of oil circuit breakers. With referencesWhich of the following statements is/are true? A In purely resistive circuit, the current lags voltage. (B In purely capacitive circuit, the voltage lags current. In purely resistive circuit, the current is in phase with voltage. D In purely inductive circuit, the current leads voltage.
- Which of the following statements is/are true? (A In purely inductive circuit, the current leads voltage. (B) In purely resistive circuit, the current lags voltage. C In purely resistive circuit, the current is in phase with voltage. D In purely capacitive circuit, the voltage lags current.Answer all the questions 1. Draw a 6-stage cascaded voltage multiplier circuit for high voltage DC generation and explain the working principle. 2. Compare the properties of Solid insulators and liquid dielectrics? 3. Define Basic Insulation Level (BIL) in power systems and Explain the voltage - time relationship with the curve in insulation coordination. 4. What are the three protective methods for surges, explain one method. 5. What are the different types of surge diverters and explain any two methods? 6. A 12-stage impulse voltage generator has a total generator capacitance of C1. The wave front resistance equal to 15000 2 and load capacitance of 2500pF. The wave tail resistance is 30 times of wave front resistance and if rise time is 1.5 µs. Calculate (i) the value of each capacitor of the generator and (ii) the tail time of the impulse wave?Q4 (a) Define three (3) advantages of alternating current (AC) for long distance power transmission compare to direct current (DC).