IE important QP

The three terminals of the IGBT are

• base, emitter & collector
• gate, source & drain
• gate, emitter & collector
• base, source & drain

IGBT possess

• low input impedance
• high input impedance
• high on-state resistance
• second breakdown problems

Which of the following diodes uses a metal-semiconductor junction?

• General purpose diodes
• Fast recovery diodes
• Schottky diode
• Slow recovery diode

The V-I Characteristics of the diode lie in the

• 1st & 2nd quadrant
• 1st & 3rd quadrant
• 1st & 4th quadrant
• Only in the 1st quadrant

The TRIAC can be represented by

• two SCRs in anti-parallel
• two SCRs in parallel
• two diodes in anti-parallel
• two diodes in parallel

two diodes in parallel

• forward current rating
• breakover voltage
• holding current
• latching current

If the cathode of an SCR is made positive with respect to the anode & no gate current is applied then

• all the junctions are reversed biased
• all the junctions are forward biased
• only the middle junction is forward biased
• only the middle junction is reversed biased

The GTO (gate turn-off thyristor) is a

• p-n-p-n device
• p-n-p device
• p-metal-n device
• p-n single junction device

For an SCR in the reverse blocking mode, (practically)

• leakage current does not flow
• leakage current flows from anode to cathode
• leakage current flows from cathode to anode
• leakage current flows from gate to anode

A GTO can be turned on by applying

• Positive gate signal
• Positive drain signal
• Positive source signal
• by a negative gate pulse