MGVCL Exam Paper (30-07-2021 Shift 1)
A fully controlled natural commutated 3-phase bridge rectifier is operating with a firing angle α = 30°, The peak to peak voltage ripple expressed as a ratio of the peak output dc voltage at the output of the converter bridge is

√3 -1
1-(√3/2)
√3-1
0.5

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

MGVCL Exam Paper (30-07-2021 Shift 1)
Determine maximum permissible load which a 15 MVA, ONAN cooled transformer to IS : 2026 can take for 6 hr, if the initial load on it was 12 MVA. The weighted ambient temperature is 20˚C. Assume the permissible load kVA as a fraction of rated kVA is 1.25.

18.75 MVA
9.6 MVA
12 MVA
15 MVA

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP

MGVCL Exam Paper (30-07-2021 Shift 1)
Voltage dips cannot be caused by which of the following:

Local and Remote faults
Inductive Loading
Capacitive Switching
Switching on of Large Loads

ANSWER EXPLANATION DOWNLOAD EXAMIANS APP