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Worksheetsquiz on SCR
Total questions: 15
Worksheet time: 8mins
A thyristor (SCR) is a
P-N-P device
N-P-N device
P-N-P-N device
P-N device
Which terminal does not belong to the SCR?
Anode
Gate
Base
Cathode
An SCR is a
four layer, four junction device
four layer, three junction device
four layer, two junction device
three layer, single junction device
In the SCR structure the gate terminal is located
near the anode terminal
near the cathode terminal
in between the anode & cathode terminal
none of the mentioned
If the cathode of an SCR is made positive with respect to the anode & no gate current is applied then
all the junctions are reversed biased
all the junctions are forward biased
only the middle junction is forward biased
only the middle junction is reversed biased
With the anode positive with respect to the cathode & the gate circuit open, the SCR is said to be in the
reverse blocking mode
reverse conduction mode
forward blocking mode
forward conduction mode
For an SCR in the forward blocking mode (practically)
leakage current does not flow
leakage current flows from anode to cathode
leakage current flows from cathode to anode
leakage current flows from gate to anode
Among the following, the most suitable method to turn on the SCR device is the
gate triggering method
dv/dt triggering method
forward voltage triggering method
temperature triggering method
For the SCR to remain in the ON (conducting) state
gate signal is continuously required
no continuous gate signal is required
no forward anode-cathode voltage is required
negative gate signal is continuously required
The value of anode current required to maintain the conduction of an SCR even though the gate signal is removed is called as the
holding current
latching current
switching current
peak anode current
The minimum value of anode current below which it must fall to completely turn-off the device is called as the
holding current value
latching current value
switching current value
peak anode current value
The latching current is _________ than the holding current
lower
higher
same as
negative of
The two transistor model of the SCR can obtained by
bisecting the SCR vertically
bisecting the SCR horizontally
bisecting the SCRs top two & bottom two layers
bisecting the SCRs middle two layers
From the two transistor (T1 & T2) analogy of SCR, the total anode current of SCR is ___________ in the equivalent circuit.
the sum of both the base currents
the sum of both the collector current
the sum of base current of T1 & collector current of T2
the sum of base current of T2 & collector current of T1
The TRIAC can be represented by
two SCRs in anti-parallel
two SCRs in parallel
two diodes in anti-parallel
two diodes in parallel
