Electrical Engineering : Switchgear Protections QUESTIONS AND ANSWERS :: part3 : 11 to 15
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
11.What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ? |
| Zero |
| Unity |
| Infinity |
| None of the above |
12.Which of the following devices will receive voltage surge first travelling on the transmission line ? |
| Lightning arresters |
| Relays |
| Step-down transformer |
| Switchgear |
13.Which of the following statements is incorrect? |
| Station batteries are used to operate relay only |
| The lightning arresters are basically surge diverters |
| An impedance relay has maximum fault current when fault occurs near the relay |
| A high speed relay has an operation of 1 to 2 cycles |
14.To reduce short circuit fault currents are used. |
| reactors |
| resistors |
| capacitors |
| none of the above |
15.Induction cup relay is operated due to changes in |
| current |
| voltage |
| impedance |
| all of the above |
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