POWER ELECTRONICS DEVICES

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

Which semiconductor power device out of the following, is not a current triggering device?

• Thyristor

• Triac

• G.T.O

• MOSFET

Which of the following device incorporates a terminal for synchronizing purposes?

• Diac

• Triac

• Silicon Unilateral Switch (SUS)

• None of the above

The advantages of SCS over SCR is

• Slow switching time and large VH

• Slow switching time and smaller VH

• Faster switching time and smaller VH

• Faster switching time and large VH

A thyristor equivalent of a thyratron tube is a

• Diac

• Triac

• Silicon controlled rectifier

• None of the above

A triac is a

• 2 terminal switch

• 2 terminal bilateral switch

• 3 terminal bilateral switch

• 3 terminal bidirectional switch

The fig. above represents a

• Triac thyristor

• Diac trigger

• Diode rectifier

• None of the above

A device that cannot be triggered with low voltage of either polarity is

• Diac

• Triac

• SCS

• All of the above

The fig. given above represents

• Silicon controlled rectifier

• Field effect transistor

• Photoemissive diode

• Tunnel diode