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
0.5
√3-1
1-(√3/2)

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

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

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MGVCL Exam Paper (30-07-2021 Shift 1)
___ is the short time reduction in the rms voltage between 0.1 to 0.9 p.u for a duration of ___

Voltage sag, greater than 1 minute
Voltage sag, 0.5 cycle to 1 minute.
Voltage swell, greater than 1 minute
Voltage swell, 0.5 cycle to 1 minute.

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MGVCL Exam Paper (30-07-2021 Shift 1)
The normal percentage bias setting of differential relay used for transformer protection will be

between 10% and 50%
above 75%
between 50% and 75%
below 10%

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