One of the main disadvantages of fuses is that they are ______________. not easi

Question

One of the main disadvantages of fuses is that they are ______________. not easily coordinated not reliable must be manually replaced none of the above The current transformer (CT) produces _________ current in its secondary winding. Increased. Reduced. Voltage proportional. None of the above. The Plug Setting Multiplier (PSM) should be set so that the overcurrent protection relay can also provide _________ protection for an adjacent line section. Main Primary Secondary Backup In ________ protection relay high currents will operate overcurrent relay faster than lower currents. Instantaneous Overcurrent Inverse Time Overcurrent Definite Time Overcurrent None of the above An over current can either be an overload or a short-circuit condition. True False A short circuit is a fault but an overload is not a fault True False The causes of Power System Faults are Lightning, Storm damage or Bush fire True False

Explanation / Answer

7)Fuses must be manually replaced is an big disadvantage

8)Current transfirmers produce reduced current in secondary because these currents are used for mesurements

9)The PSM should set such that it also provide backup protection for adjacent line section

10)In inverse time over current relay,time and current are inversely proportional i.e high currents will operate faster than lower currents

11)True,Overload condition also requires over current but not that much of short circuit

12)True,because an overload condition occurs when there is an electric fault which results in higher currents but smaller than the currents require for short circuit

13)True,they also cause power system fault

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