UPPCL EE : Power electronics Quiz 4

A single-phase full Bridge Diode rectifier delivers a constant load current 20 A then average and rms values of source current are respectively –

Statement I: DC input voltage is to be adjusted to control the magnitude of output voltage when square wave switching is used.

Statement II: Regulation of output voltage magnitude is not possible in square wave switching.

Consider the following statements regarding VSI and CSI.

1. Feedback diodes are not required in CSI

2. In VSI, supply gets short circuited if incoming device will switch ON before outgoing device switches OFF

3. In CSI, commutating capacitor cannot be connected directly across the load

Which of the above statement are correct?

For a single-phase full bridge inverter, inductive reactance is double that of capacitive reactance. Also, resistance is same as that of capacitive reactance. Then, Diode conduction angle is____

A single phase inverter uses sinusoidal pulse width modulation to control its output. Input dc voltage to the inverter is 250V and modulation index is 0.6. Find the rms value of fundamental component of output voltage?

Which of the following is also known as 'Quasi wave inverter'?

Inverter circuits are used in which of the following applications?

A PWM switching scheme is used with an inverter to

Statement 1 (S1): For 3 –  VSI with 180° conduction mode, phase voltage waveform is quasi square wave.

Statement 2 (S2): For 3 –  VSI with 120° conduction mode, line voltage waveform is 6 step wave form.

In single pulse width modulation used in PWM inverters, for eliminating 5^th harmonic component in the output voltage, the pulse width should be