DC to AC converter (Inverter)

What is an inverter?

• A device which converts AC power to DC power

• A device which converts DC power to AC power

• A device which stores electrical energy

• A device which measures voltage

Fill in the blank: The output voltage waveform of the inverter can be ________, quasi-square wave, or low distorted sine wave.

• square-wave

• triangular wave

• sawtooth wave

• rectified wave

Fill in the blank: One of the applications in industry is ________ AC drives.

• Adjustable

• Constant

• Fixed

• Manual

Fill in the blank: UPS stands for Uninterruptible Power Supply and is used in appliances like ________.

• computers

• refrigerators

• televisions

• washing machines

Which of the following semiconductor devices are widely used as switching?

• Thyristor, BJT, GTO, IGBT, MOSFET

• Diode, Resistor, Capacitor

• Transformer, Inductor, Relay

• None of the above

The output voltage in inverters for low to medium power applications is controlled using the ______ technique.

• pulse width-modulation (PWM)

• phase-shift modulation

• frequency modulation

• amplitude modulation

When a thyristor based inverter supplies an AC power to an isolated load, ______ techniques are required.

• force commutation

• natural commutation

• resonant commutation

• pulse width modulation

Thyristor based inverters are used only in ______ applications.

• Low-power

• Medium-power

• High-power

• All of the above

What is required to turn OFF a thyristor operating in the ON state?

• Increasing the current flowing through it

• Reducing the current flowing through it

• Increasing the voltage across it

• Reducing the voltage across it

Inverters are mainly classified based on the nature of input power source. Fill in the blank: One type of inverter is the ________ (VSI).

• Voltage Source Inverter

• Current Source Inverter

• Power Source Inverter

• Frequency Source Inverter