The on – state voltage drop of IGBT consists of__________?

A. Drop across the collector junction
B. Drop across the drift region
C. Drop across mosfet portion
D. All of these

Harmonics in 3 phase inverters can be reduced by using___________?

A. Passive filter
B. Active filter
C. Both passive and active filters
D. None of these

To detect an over – current fault condition, the most reliable method is to connect a_____________?

A. Current sensor across igbt
B. Voltage sensor across igbt
C. Current sensor in series with igbt
D. Voltage sensor in series with igbt

The advantage of using free – wheeling diode in half controlled bridge converter is that

A. There is always a path for the dc current independent of the ac line
B. There is always a path for the ac current independent of the ac line
C. There is always a path for the dc current dependent of the ac line
D. There is always a path for the ac current independent of the ac line

The IGBT resulted in higher switching speed and lower energy losses. It can be used for___________?

A. Uninterruptible power supplies
B. Induction heating system
C. Constant voltage and frequency power supplies
D. All of these

The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is___________?

A. Sine wave
B. Square wave
C. Saw – tooth wave
D. Trapezoidal wave

An ideal diode is___________?

A. Unidirectional
B. Bidirectional
C. Fixed voltage polarity
D. Only (a) and (c)

A full wave rectifier with resistive load produces___________?

A. Second harmonic
B. Third harmonic
C. Fifth harmonic
D. Do not produce harmonics

Bidirectional semiconductor device is___________?

A. Diode
B. Bjt
C. Scr
D. Triac

A crowbar is a circuit which is used to protect a_____________?

A. Voltage sensitive load from excessive dc power supply output voltages
B. Current sensitive load from excessive dc power supply output voltages
C. Voltage sensitive load from excessive ac power supply output voltages
D. Current sensitive load from excessive ac power supply output voltages