UNIT 3

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.