Relay | Protective Relay Objective Type Questions and answers

11.  The relay used for feeder protection is

   A. Under voltage relay

   B. Translay relay

   C. Thermal relay

   D. Buchholz relay

12.  Which relay is used to detect and protect internal fault in a transformer ?

   A. Buchholz relay

   B. Directional relay

   C. Thermal relay

   D. Distance relay

13.  Which one of the following relay has the capability of anticipating the possible major fault in a transformer ?

   A. Over-current relay

   B. Differential relay

   C. Buchholz relay

   D. Over fluxing relay

14.  Zero sequence current is used for relaying purpose only in the case of

   A. Phase over current really

   B.Phase impedance relay

   C. Ground over current relay

   D. Ground impedance relay

15.  To prevent mal operation of differentially connected relay while energising a transformer, the relay restraining coil is biased with

   A. Second harmonic current

   B. Third harmonic current

   C. Fifth harmonic current

   D. Seventh harmonic current

< 1 2 3 4 5 6 7 8 9 10 Next>