DGVCL Exam Paper (11-12-2011) Which type of back up protection is widely used for the protection of transmission lines? Remote backup Breaker backup Relay backup Control backup Remote backup Breaker backup Relay backup Control backup ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) Reactance relay is used to protect against Both phase and earth faults Phase faults only Earth faults only Over voltage faults Both phase and earth faults Phase faults only Earth faults only Over voltage faults ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) In the protection of transformers, harmonic restraint is used to guard against Lightning Magnetizing inrush current Switching over voltages Unbalanced protection Lightning Magnetizing inrush current Switching over voltages Unbalanced protection ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Initial inrush of magnetizing currents have high component of even and odd harmonics.2nd - 63%3rd -26.8%4th- 5.1%5th- 4.1%6th- 3.77th-2.4
DGVCL Exam Paper (11-12-2011) The circuit breaker generally used in railway traction is Bulk Oil CB Air break CB Vacuum CB Minimum Oil CB Bulk Oil CB Air break CB Vacuum CB Minimum Oil CB ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) Permittivity is expressed in terms of Weber /m farad/sq. m. N/m Farad/m Weber /m farad/sq. m. N/m Farad/m ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) In carrier current protection, the purpose of the wave trap is for Trapping high frequency waves entering into generator/transformer unit. All of these Tripping fault current Trapping power frequency waves Trapping high frequency waves entering into generator/transformer unit. All of these Tripping fault current Trapping power frequency waves ANSWER DOWNLOAD EXAMIANS APP
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