For bidirectional operation of converters____________?

A. A parallel combination of controllable switch and a diode is used
B. A parallel combination of controllable switch and capacitor is used
C. A series combination of controllable switch and a diode is used
D. A series combination of controllable switch and a capacitor is used

Advantages of HVDC transmission over AC system is / are____________?

A. Reversal of power can be controlled by firing angle
B. Very good dynamic behavior
C. They can link two ac system operating unsynchronized
D. All of these

For a buck converter to reduce the conduction losses in diode

A. A high on – resistance switch can be added in parallel
B. A low on – resistance switch can be added in parallel
C. A high on – resistance switch can be added in series
D. A low on – resistance switch can be added in series

The conduction losses in IGBT is____________?

A. More than that of mosfet
B. Lower than that of mosfet
C. Equal to that of mosfet
D. Equal to that of bjt

In dual converters________________?

A. Both rectifiers provides positive current to the load
B. Both rectifiers provide negative current to the load
C. One rectifiers provide positive current to the load and the other negative current
D. One rectifier provide positive current to the source and the other negative current to the load

The power MOSFET device is a___________?

A. Current controlled unipolar device
B. Voltage controlled unipolar device
C. Current controlled bipolar device
D. Voltage controlled bipolar device

n a phase controlled 3 phase ac voltage controller, the harmonic present is__________?

A. 2nd
B. 3rd
C. 5th
D. 7th

With increase in firing angle,

A. Both harmonic distortion and quality of input current increases
B. Harmonic distortion increases and quality of input current decreases
C. Harmonic distortion decreases and quality of input current increases
D. Both harmonic distortion and quality of input current decreases

The maximum firing angle in the half wave controlled regulator is_____________?

A. 180 degree
B. 190 degree
C. 200 degree
D. 210 degree

The most suited gate pulses given to the AC regulator with R – L load can be in the form of____________?

A. Continuous signal
B. Large isolating pulse transformer
C. A train of pulses
D. None of these