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Switchgear Protections - Interview Questions and Answers

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56. A differential relay measures the vector difference between
A. two currents
B. two voltages
C. two or more similar electrical quan�tities
D. none of the above
Explanation:
57. Which of the following devices will receive voltage surge first travelling on the transmission line ?
A. Lightning arresters
B. Relays
C. Step-down transformer
D. Switchgear
Explanation:
58. Which of the following statements is incorrect?
A. Station batteries are used to operate relay only
B. The lightning arresters are basically surge diverters
C. An impedance relay has maximum fault current when fault occurs near the relay
D. A high speed relay has an operation of 1 to 2 cycles
Explanation:
59. To reduce short circuit fault currents are used.
A. reactors
B. resistors
C. capacitors
D. none of the above
Explanation:
60. Induction cup relay is operated due to changes in
A. current
B. voltage
C. impedance
D. all of the above
Explanation:
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