The short circuit in any winding of the transformer is the result of______________?

Related Mcqs:

1. The short circuit in any winding of the transformer is the result of_______________?

   A. mechanical vibration
   B. insulation failure
   C. loose connection
   D. impulse voltage

2. The arcing contacts in a circuit breaker are made of______________?

   A. copper tungsten alloy
   B. porcelain
   C. electrolytic copper
   D. aluminium alloy

3. To reduce short circuit fault currents are used_____________?

   A. reactors
   B. resistors
   C. capacitors
   D. none of the above

4. Short-circuit currents are due to_______________?

   A. single phase to ground faults
   B. phase to phase faults
   C. two phase to ground faults
   D. three phase faults
   E. any of these

5. A short-circuit is identified by_____________?

   A. no current flow
   B. heavy current flow
   C. voltage drop
   D. voltage rise

6. To limit short-circuit current in a power system are used______________?

   A. earth wires
   B. isolators
   C. H.R.C. fuses
   D. reactors

7. A _________ is used to measure the stator % winding temperature of the generator?

   A. thermocouple
   B. pyrometer
   C. resistance thermometer
   D. thermometer

8. The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?

   A. heavy loads
   B. internal short-circuits
   C. external short-circuits
   D. all of the above

9. For which of the following ratings of the transformer differential protection is recommended ?

   A. above 30 kVA.
   B. equal to and above 5 MVA
   C. equal to and above 25 MVA
   D. none of the above

10. Arc in a circuit behaves as_______________?

    A. a capackive reactance
    B. an inductive reactance
    C. a resistance increasing with voltage rise across the arc
    D. a resistance decreasing with voltage rise across the arc