Mr. Gavde P. B.
M. E. (Electronics)
(Lecturer in Electronics)
Electronics & communication Department
Government Polytechnic,Beed
Forward voltage triggering
Gate triggering
Dv/dt triggering
Thermal triggering
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10mA
13mA
14mA
15mA
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VGS>VGS(TH)
VGS
VGS=VGS(TH)
VGS=0
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Medium intensity
Low intensity
High intensity
Bulb in off condition
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Drain ,source & Gate
Collector,Emitter & Gate
Drain,Source& Emitter
Both 1 & 2
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60 degree
80 degree
100 degree
120 degree
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Reduce anode current below IH
By applying negative gate pulse to GK
By applying positive gate pulse to GA
All of the above
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SCR
Diode
BJT
PUT
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TRIAC
DIAC
Diode
UJT
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Minimum on state current required to keep the device in the on state after the triggering pulse has been removed SCR will not Turn off
Minimum on state current required to keep the device in the on state after the triggering pulse has been removed SCR will remain Turn ON
Minimum on state current required to keep the device in the on state after the triggering pulse has been removed SCR will Turn off
Both 1 & 2
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Mode I & II
Mode II & III
Mode I & IV
Mode III & IV
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750A
-750A
780A
-780A
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Voltage control Device
Current control Device
Both 1 & 2
None of above
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Star connection
Transformer connection
Delta connection
Both 1 & 3
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0.2 to 0.4
0.3 to 0.5
0.9 to 1.3
0.5 to 0.8
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Full converter
Semiconverter
Dual Converter
Both 1& 2
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Zero
Minimum
Increases
None of above
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Direction of Hole flow
Dirction of Current flow
Direction of electron flow
All of the above
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SUS
SBS
LASCR
PUT
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Circle
Square block
Switch with an arrow
Zig-zac
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It prevent reversal of load voltage except for small voltage drop
It convert AC to pulsating DC
It transfer the load current away from the main rectifier,thereby allowing all of its thyristor to regain their blocking state
None of above
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Selenium diode protection
Snubber circuit protection
Crowbar protection
Metal oxide varistor
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3K Ohm to 4K Ohm
1K Ohm to 3k Ohm
4K Ohm to 10k Ohm
10K Ohm to 14k Ohm
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It is mimimum forward anode current required to keep SCR on if the current fall below the holding level,then SCR remain in turn on
It is mimimum forward anode current required to keep SCR on if the current fall below the holding level,then SCR turn off
Both 1 & 2
None of above
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