7) Answer the following True/False Questions: +2 correct, -1 incorrect, O if lef

Question

7) Answer the following True/False Questions: +2 correct, -1 incorrect, O if left blank. a) In a buck-boost converter, the capacitor charges when the switch is on. In an ideal 3-phase inverter, the ac output voltages are zero if the lower b) switches are all gated on at the same time -Inabuck converter, if both the diode and transistor have a 1 V drop, d) In a single-phase inverter under sine-triangle modulation, if duty +10cos(100t), there will be low frequency harmonics in the output ac voltage. I n an ideal Cuk converter, Vei)-V V) cl/2 f For an ideal capacitor, instantaneous power is always zero. g) In a single-phase rectifier with zero source inductance sourcing a resistive load, adding a large (ideal) dc inductor will not change average output current, but it does change the peak value of the phase current

Explanation / Answer

a Ans) False

The capacitor actually discharges through load.

b Ans) True

When all bottom switches are turned ON, load is not connected to source and hence output voltage will be zero.

c Ans) False

The output voltage would decrease and expression will be

Vout = Duty * ( Vin - 1 )

d Ans) True

In overmodulation , Low frequency harmonics are present in the output voltage waveform.

f Ans) False

Capacitor provides instantaneous power. It is not zero but average power is zero.

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