Level 3 Electronics| Ques ons and answers | Updated
RATED A+ | NEW 2026
An SCR is a _________ layer, _______ junc on device
4 layer, 3 junc on
Form Factor for Single Phase Half Wave (VDC Average)
Eline x _____
.45
Form Factor for Single Phase Full Wave (VDC Average)
Eline x _____
.9
Form Factor for 3 Phase Half Wave (VDC Average)
Eline x _____
.675 ( 135 divided by 2 )
Form Factor for 3 Phase Full Wave (VDC Average)
Eline x _____
1.35
An SCR, compared to an electromechanical device, would be called a
Latching Relay
Explain why barrier voltage must be overcome for a diode to conduct
Electron/Hole pairing leaves a neutral deple on zone
BJT (Bipolar Junc on Transistor) can be used for two different purposes, what are they?
Switch and Amplifier
List three advantages of a solid state switch
No Arcing, No pi<ng, No contact bounce
To which of the four layers of an SCR does the Gate a>ach?
Inner "P" type
, To which lead is the "N"-type material a>ached in a diode
Kathode
The destruc ve current that can flow when a diode is connected reverse bias is called?
Avalanche current
Two important diode ra ngs are?
P.I.V. ( Peak Inverse Voltage ) and Forward current
What is the ripple frequency of a six pulse, 3 phase rec fier, connected to a 60hz supply?
60hz x 6 = 360hz
Reverse Bias means that the kathode is connected to Pos/Neg ?
Posi ve
What is the limit of opera on frequency for an SCR?
25 kHZ
Describe what natural commuta on means with respect to an SCR?
Anode to Kathode current is interrupted
If a decrease in base resistance does not create an increase in Vrl, we would say that the
transistor is ?
Saturated
A SCR is
A) Unidirec onal
B) Bidirec onal
C) Tridirec onal
A ) Unidirec onal
With reference to SCR ra ngs, describe Vrrm
Repe ve Reverse Blocking Voltage
When SCR's are connected inverse parallel to provide full AC phase control, they become bi-
direc onal
RATED A+ | NEW 2026
An SCR is a _________ layer, _______ junc on device
4 layer, 3 junc on
Form Factor for Single Phase Half Wave (VDC Average)
Eline x _____
.45
Form Factor for Single Phase Full Wave (VDC Average)
Eline x _____
.9
Form Factor for 3 Phase Half Wave (VDC Average)
Eline x _____
.675 ( 135 divided by 2 )
Form Factor for 3 Phase Full Wave (VDC Average)
Eline x _____
1.35
An SCR, compared to an electromechanical device, would be called a
Latching Relay
Explain why barrier voltage must be overcome for a diode to conduct
Electron/Hole pairing leaves a neutral deple on zone
BJT (Bipolar Junc on Transistor) can be used for two different purposes, what are they?
Switch and Amplifier
List three advantages of a solid state switch
No Arcing, No pi<ng, No contact bounce
To which of the four layers of an SCR does the Gate a>ach?
Inner "P" type
, To which lead is the "N"-type material a>ached in a diode
Kathode
The destruc ve current that can flow when a diode is connected reverse bias is called?
Avalanche current
Two important diode ra ngs are?
P.I.V. ( Peak Inverse Voltage ) and Forward current
What is the ripple frequency of a six pulse, 3 phase rec fier, connected to a 60hz supply?
60hz x 6 = 360hz
Reverse Bias means that the kathode is connected to Pos/Neg ?
Posi ve
What is the limit of opera on frequency for an SCR?
25 kHZ
Describe what natural commuta on means with respect to an SCR?
Anode to Kathode current is interrupted
If a decrease in base resistance does not create an increase in Vrl, we would say that the
transistor is ?
Saturated
A SCR is
A) Unidirec onal
B) Bidirec onal
C) Tridirec onal
A ) Unidirec onal
With reference to SCR ra ngs, describe Vrrm
Repe ve Reverse Blocking Voltage
When SCR's are connected inverse parallel to provide full AC phase control, they become bi-
direc onal
