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WorksheetsUNIT 3
Total questions: 20
Worksheet time: 20mins
SCR is
Silicon Controlled Rectifier
Substrate Controlled Regulator
Silicon Controlled Regulator
Substrate Controlled Rectifier
Other name for SCR is
Triac
Unijunction transistor
Diac
Thyristor
An SCR has …………….. pn junctions
Four
Two
Three
None of the above
An SCR has three terminals viz ……………
Cathode, anode, gate
Anode, cathode, drain
Anode, cathode, grid
None of the these
An SCR combines the features of …………..
A rectifier and resistance
A rectifier and transistor
A rectifier and capacitor
None of the above
The normal way to turn on a SCR is by ……………..
Breakover voltage
Appropriate anode current
Appropriate gate current
None of the these
An SCR is turned off by …………….
Reducing gate voltage to zero
Reverse biasing the gate
None of these
Reducing anode voltage to zero
The three terminals of the IGBT are
base, emitter & collector
gate, source & drain
gate, emitter & collector
base, source & drain
Identify the symbol
SCS
PUT
Diac
LASCR
The silicon-controlled switch (SCS) is similar in construction to the
triac
diac
SCR
4-layer diode.
You need to design a relaxation oscillator circuit. The most likely device to use might be
an SCR
UJT
a triac
a 4-layer diode
The controlling parameter in IGBT is the
IG
VGE
Ic
VCE
A UJT has ……………….
Two pn junctions
One pn junction
Three pn junctions
None of these
Between the peak point and the valley point of UJT emitter characteristics we have ………….. region
Saturation
Negative resistance
Cut-off
None of these
Which of the following is not a characteristic of UJT?
Intrinsic stand off ratio
Negative resistance
Peak-point voltage
Bilateral conduction
6. How many terminals does a programmable unijunction transistor (PUT) have?
4
3
2
1
For an SCS, a ________ pulse at the anode gate turns the device on, while a ________ pulse will turn it off
negative, positive
bot positive
positive, negative
both negative
PUT stands for
Programmable Universal Transistor
Programmable United Transistor
Programmable Unipolar Transistor
Programmable Unijunction Transistor
Which of the following devices has (have) four layers of semiconductor materials?
SCR
SCS
PUT
All of these
LASCR stands for
Light Activated Silicon Controlled Rectifier
Light Activated System Controlled Rectifier
Light Advanced Silicon Controlled Rectifier
Light Activated Silicon Common Rectifier
