Basic Power Electronics (22427) Quiz
Mr. Gavde P. B. M. E. (Electronics) (Lecturer in Electronics) Electronics & communication Department Government Polytechnic,Beed
- 1.Latching current define as ........
- A.
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
- B.
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
- C.
Minimum on state current required to keep the device in the on state after the triggering pulse has been removed SCR will Turn off
- D.
Both 1 & 2
- 2.Holding current define as .......
- A.
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
- B.
It is mimimum forward anode current required to keep SCR on if the current fall below the holding level,then SCR turn off
- C.
Both 1 & 2
- D.
None of above
- 3.Ia = α2Ig+IcEo / (1-α) in this equation if α approaches to unity then anode current will be
- A.
Zero
- B.
Minimum
- C.
Increases
- D.
None of above
- 4.If value of latching current is 12mA what is the value of holding current.....
- A.
10mA
- B.
13mA
- C.
14mA
- D.
15mA
- 5.For 4000V,3000A GTO need .........gate current to Turn Off
- A.
750A
- B.
-750A
- C.
780A
- D.
-780A
- 6.In TRIAC which mode is less sensitive
- A.
Mode I & II
- B.
Mode II & III
- C.
Mode I & IV
- D.
Mode III & IV
- 7.Arrow in the MOSFET symbol indicates..........
- A.
Direction of Hole flow
- B.
Dirction of Current flow
- C.
Direction of electron flow
- D.
All of the above
- 8.Power MOSFET is .....
- A.
Voltage control Device
- B.
Current control Device
- C.
Both 1 & 2
- D.
None of above
- 9.In IGBT three terminals are .....
- A.
Drain ,source & Gate
- B.
Collector,Emitter & Gate
- C.
Drain,Source& Emitter
- D.
Both 1 & 2
- 10.In which condition IGBT Turn on
- A.
VGS>VGS(TH)
- B.
VGS
- C.
VGS=VGS(TH)
- D.
VGS=0
- 11.Interbase resistance (RBB) in UJT exist between.....
- A.
3K Ohm to 4K Ohm
- B.
1K Ohm to 3k Ohm
- C.
4K Ohm to 10k Ohm
- D.
10K Ohm to 14k Ohm
- 12.Intrinsic stand off ratio range in between .....
- A.
0.2 to 0.4
- B.
0.3 to 0.5
- C.
0.9 to 1.3
- D.
0.5 to 0.8
- 13.Which device is called as uncontrolled rectifier
- A.
SCR
- B.
Diode
- C.
BJT
- D.
PUT
- 14.In 2 quadrant converter polarity of output voltage can be either positive of negative however output current has one polarity only called as.......
- A.
Full converter
- B.
Semiconverter
- C.
Dual Converter
- D.
Both 1& 2
- 15.Which one is not function of freewheeling diode......
- A.
It prevent reversal of load voltage except for small voltage drop
- B.
It convert AC to pulsating DC
- C.
It transfer the load current away from the main rectifier,thereby allowing all of its thyristor to regain their blocking state
- D.
None of above
- 16.In three phase half wave controlled rectifier with resistive load primary is.....
- A.
Star connection
- B.
Transformer connection
- C.
Delta connection
- D.
Both 1 & 3
- 17.In 3 phase half wave controlled rectifier conduction period for each thyristor is equal to ....
- A.
60 degree
- B.
80 degree
- C.
100 degree
- D.
120 degree
- 18.If dc circuit of 240V is to be protected with 25V selenium cell then how many cells required
- A.
10
- B.
12
- C.
14
- D.
16
- 19.For Thyristor overcurrent protection which is better option
- A.
Selenium diode protection
- B.
Snubber circuit protection
- C.
Crowbar protection
- D.
Metal oxide varistor
- 20.How to turn off SCS
- A.
Reduce anode current below IH
- B.
By applying negative gate pulse to GK
- C.
By applying positive gate pulse to GA
- D.
All of the above
- 21.Which device is complementry SCR
- A.
SUS
- B.
SBS
- C.
LASCR
- D.
PUT
- 22.Which method is more reliable & efficient to turn ON SCR
- A.
Forward voltage triggering
- B.
Gate triggering
- C.
Dv/dt triggering
- D.
Thermal triggering
- 23.Reverse characteristics of SCR similer to the...
- A.
TRIAC
- B.
DIAC
- C.
Diode
- D.
UJT
- 24.Device used for a chopper can be represented by
- A.
Circle
- B.
Square block
- C.
Switch with an arrow
- D.
Zig-zac
- 25.In light Dimmer if Pot is in mid position then intensity of light is
- A.
Medium intensity
- B.
Low intensity
- C.
High intensity
- D.
Bulb in off condition
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