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In a static over current relay, inverse time characteristics are obtained by


A) A transistor amplifier
B) An integrating circuit
C) A transistor switch
D) A differentiating circuit

E) C) and D)
F) None of the above

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How many relays are used to detect interphase fault of a three line system?


A) One
B) Two
C) Three
D) Six

E) B) and D)
F) A) and C)

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For protection of parallel feeders fed from one end, the relays required are


A) Nondirectional relays at the source end and directional relay at the load end
B) Nondirectional relay at both ends
C) Directional relay at source end and nondirectional relay at load end
D) Directional relay at both ends

E) All of the above
F) A) and D)

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For ground fault we prefer


A) Plain impedance relay
B) Directional over current relay
C) Mho relay
D) Reactance relay

E) C) and D)
F) B) and C)

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The under voltage relay can be used for


A) Generators
B) Bus bars
C) Transformers
D) All of the above

E) B) and D)
F) B) and C)

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