Transmission Line Objective Type Questions and answers

31.  For complete protection of a three-phase transmission line, we require

   A. Three phase and three earth fault relays

   B. Three phase and two earth fault relays

   C. Two phase and two earth fault relays

   D. Two phase and one earth fault relays

32.  The transmission line distance protection relay having the property of being inherently directional is

   A. Impedance relay

   B. MHO relay

   C. OHM relay

   D. Reactance relay

33.  A line trap in a long transmission line is used to

   A. Improve the power factor

   B. Dampen the over voltage oscillations

   C. Confine the carrier signals in the line

   D. Protect the line against direct lightning stroke

34.  Which of the following factors should be considered in the design of a transmission line against lightning with ground wire?

   A. Mechanical strength of ground wire

   B. Clearance between line conductor and ground wire

   C. Clearance between the line conductor and earth

   D. All of the above

35.  Overhead ground wires are used to protect a transmission line against

   A. Line to ground faults

   B. Arcing earths

   C. Voltage surges due to direct lightning stroke

   D. High-voltage oscillations due to switching

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