POWER ELECTRONICS_UNIT_V_DC-AC Converters_Day-Day Assessment

What is the primary function of a DC-AC converter?

• To amplify direct current (DC) signals.

• To convert direct current (DC) into alternating current (AC).

• To convert alternating current (AC) into direct current (DC).

• To store energy in a battery.

Name two common types of DC-AC converters.

• Hybrid inverter

• Transformer inverter

• Square wave inverter, Sine wave inverter

• Pulse width modulation inverter

What is the role of an inverter in a DC-AC converter?

• To convert AC back into DC

• To regulate voltage levels in a circuit

• To store energy for later use

• The role of an inverter in a DC-AC converter is to convert direct current (DC) into alternating current (AC).

How does a PWM (Pulse Width Modulation) technique work in DC-AC conversion?

• PWM modulates the duty cycle of pulses to create an AC waveform from a DC source.

• PWM converts AC signals into DC by filtering the waveform.

• PWM uses a constant frequency to maintain a steady DC output.

• PWM increases the voltage level of DC directly to AC.

What are the advantages of using a DC-AC converter in renewable energy systems?

• Increased carbon emissions

• Higher installation costs

• The advantages of using a DC-AC converter in renewable energy systems include enabling grid compatibility, improving energy efficiency, and facilitating the use of energy storage.

• Reduced energy output

Explain the difference between a full-bridge and half-bridge inverter.

• A full-bridge inverter is more efficient than a half-bridge inverter.

• A full-bridge inverter can produce both positive and negative output voltages, while a half-bridge inverter can only produce positive and zero voltages.

• A half-bridge inverter can produce both positive and negative output voltages.

• A full-bridge inverter requires fewer components than a half-bridge inverter.

What is the significance of the output waveform in DC-AC conversion?

• The output waveform defines the quality and characteristics of the AC signal produced from a DC source.

• The output waveform determines the efficiency of the DC source.

• The output waveform only affects the input DC voltage.

• The output waveform is irrelevant in DC-AC conversion.

How do you calculate the efficiency of a DC-AC converter?

• Efficiency (%) = (Output Power / Input Power) x 100

• Efficiency (%) = (Input Power / Output Power) x 100

• Efficiency (%) = (Output Power + Input Power) x 100

• Efficiency (%) = (Output Power - Input Power) x 100

What are the typical applications of DC-AC converters?

• Industrial heating systems

• Television broadcasting

• Renewable energy systems, uninterruptible power supplies (UPS), electric vehicles, and motor drives.

• Home appliances

What safety precautions should be taken when working with DC-AC converters?

• Ensure proper grounding, use insulated tools, wear PPE, follow lockout/tagout procedures, and avoid working on live circuits.

• Use metal tools for better conductivity

• Work on live circuits for efficiency

• Ignore PPE if the task seems simple