TRIAC

A silicon controlled rectifier (SCR) is a

• Unijunction device

• Device with three junction

• Device with four junction

• None of the above

A thyristor is basically

• PNPN device

• A combination of diac and triac

• A set of SCRs

• A set of SCR, diac and a triac

An SCR has three terminals viz ……………

• Cathode, anode, gate

• Anode, cathode, grid

• Anode, cathode, drain

• None of the above

In normal operation of an SCR, gate is ………..w.r.t. cathode

• Positive

• Negative

• At zero potential

• None of the above

SCR is a ……………….. controlled device

• Voltage

• Current

• Voltage as well as current

• None of the above

When an SCR is turned on, the voltage across it is about ……….

• zero

• 1 volt

• 10 volt

• 0.1 volt

An SCR is turned off when …………..

• Gate is reverse biased

• Gate voltage is reduced to zero

• Anode current is reduced to zero

• None of the above

1) The Main Difference between SCR and SCS in?

• a)Gate Terminal

• b)Anode Terminal

• c)Cathode Terminal

• d)Base Terminal

4) FET control?

• a) Voltage

• b) Current

• c) Greater Thermal Stability

• d) Both B and C

5) IGBT is the second most widely used device after?

• a) SCR

• b) Diode

• c) BJT

• d) MOSFET