Industrial Electronics

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 disc and triac

• A set of SCR's

• A set of SCR,DIAC & TRIAC

A triac is a

• 2 terminal switch

• 2 terminal bilateral switch

• 3 terminal bilateral switch

• 3 terminal bidirectional switch

• TRIAC

• DIAC

• DIODE

• None

Which of the following finds applications in speed control of a DC motor?

• FET

• Transistor

• SCR

• None

For the high-frequency choppers, the device that is preferred is

• TRIAC

• Thyrsitor

• Transistor

• GTO

In a thyristor circuit, the angle of conduction is changed by changing______

• Anode current

• Gate current

• Forward current

• Anode voltage

Inverter converts

• DC to AC

• AC to DC

• DC to DC

• AC to AC

A SCR is a ________ switch

• One directional

• Two directional

• Three directional

• Four directional

Which of the following are the functions of a transistor?

• Rectifier and fixed resistor

• Switching device and fixed resistor

• Tuning device and rectifier

• Variable resistor and switching device