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.Management Sciences
Category: Power Electronics
An SCR is considered to be a semi controlled device because_______?
A. it can be turned OFF but not ON with a gate pulse.
B. it conducts only during one half cycle of an alternating current wave.
C. it can be turned ON but not OFF with a gate pulse.
D. it can be turned ON only during one half cycle of an AC.
A single phase full bridge inverter can operated in load commutation mode in case load consist of______?
A. RL.
B. RLC underdamped.
C. RLC overdamped.
D. RLC critically damped
The power demand can be estimated approximately by___________?
A. Load survey method
B. Mathematical method
C. Statistical method
D. Economic parameters
In BJT, switching losses occurs___________?
A. Only at turn – on
B. Only at turn – off
C. Both at turn on and off
D. None of these
Why resistor is used in Snubber circuit_________________ ?
A. To minimize the loss
B. To minimize the charging current
C. To minimize the discharging current
D. All of these
Which statement is true ?
A. Reverse recovery time ( trr ) > gate recovery time (tgr)
B. Device turn OFF time ( tq ) > reverse recover time (trr)
C. Circuit turn OFF time > device turn OFF time ( tq )
D. All of these
Dynamic equalizing circuit is used for________________?
A. equal division of voltage across each thyristor
B. equal division of current through each thyristor in parallel
C. equal division of voltage across each thyristor in parallel
D. equal division of current through each thyristor in series
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