PDF--PAGE --2 QUESTION AND ANSWER

The current which is helpful for LED to turn on is_________

• emitter current

• depends on bias

• base current

• collector current

Which of the following statements is true?

• Solid state switches are applications for an AC output

• LED’s can be driven by transistor logics

• Only NPN transistor can be used as a switch

• Transistor operates as a switch only in active region

The technique used to quickly switch off a transistor is by_________

• reverse biasing its emitter to collector junction

• reverse biasing its base to collector junction

• reverse biasing its base to emitter junction

• reverse biasing any junction

The switching power with a PNP transistor is called _________

• sourcing current

• sinking current

• forward sourcing

• reverse sinking

A pnp transistor has

• only acceptor

• only donor ions

• two p- region and one-N -region

• three P-N junction

The time taken for a transistor to turn from saturation to cut off is _________

• inversely proportional to charge carriers

• directly proportional to charge carriers

• charging time of the capacitor

• discharging time of the capacitor

The base emitter voltage in a cut off region is _________

• greater than 0.7V

• equal to 0.7V

• Less than 0.7V

• cannot be predicted

A relay is used to

• Break the fault current

• sense the fault

• sense the fault and direct to trip the circuit breaker

• all of these

Which of the following rule is used to determine the direction of rotation of D.C motor?

• Fleming’s Left-hand Rule

• Columb’s Law

• Lenz’s Law

• Fleming’s Right-hand Rule

MOSFETs as compare to BJT has

• high speed

• low speed

• zero speed

• low gain