EL_6_PE-2(2160902)_2020

A single phase full bridge inverter has a dc voltage source Vs = 230 V. Find the RMS value of the fundamental component of output voltage.

• 90 V

• 207 V

• 350 V

• 196 V

In single phase VSI, the harmonic which is not present is

• 2^nd

• 3^rd

• 5^th

• 7^th

Very large values of modulation index (greater than 3.24) lead to

• Square AC output voltage

• Sine AC output voltage

• Triangular AC output voltage

• Trapezoidal AC output voltage

Single phase VSI are mainly used in

• Power supplies

• Ups

• Multilevel configuration

• All of these

In the SPWM, the modulating signal is

• Square

• Sinusoidal

• Triangular

• Saw - tooth

In a full bridge VSI, in order to avoid the short circuit across the DC bus and the undefined AC output voltage condition, the modulating technique should ensure that

• Top switch of each leg is on at any instant

• Bottom switch of each leg is on at any instant

• Either (a) or (b)

• None of these

In a lossless inverter, the average power absorbed in one period by the load must be

• Equal to the average power supplied by the dc source

• Greater than the average power supplied by the dc source

• Lesser than the average power supplied by the dc source

• Equal to the average power supplied by the ac source

If energy is taken from the AC side of the inverter and sends it back into the DC side, then it is known as

• Motoring mode operation

• Braking mode operation

• Regenerative mode operation

• None of these

The ac output voltage waveform of VSI and AC output current waveform of CSI respectively is composed of

• High dv / dt, low di / dt

• Low dv / dt, low di / dt

• Low dv / dt, high di / dt

• High dv / dt, high di / dt

A capacitive load in voltage source inverters generates

• Small current spikes and can be reduced by using an inductive filter

• Large current spikes and can be increased by using an inductive filter

• Small current spikes and can be increased by using an inductive filter

• Large current spikes and can be reduced by using an inductive filter