Buck and Boost Converter Quiz

In a buck converter, the output voltage is typically:

• Higher than the input voltage

• Lower than the input voltage

• Equal to the input voltage

• Zero

What component controls the switching frequency in a typical buck converter circuit?

• Capacitor

• Inductor

• Transistor/MOSFET

• Resistor

In continuous conduction mode (CCM), the inductor current in a buck converter:

• Never falls to zero

• Always falls to zero

• Is sinusoidal

• Is independent of load

For a buck converter, the duty cycle D is given by:

• D=Vout/Vin

• D=Vin/Vout

• D=1−Vout/Vin

• D=Vin⋅Vout

Which of the following is a key disadvantage of the buck converter?

• Low efficiency

• Requires a high-frequency transformer

• Output voltage can never exceed input voltage

• Requires high power dissipation

What is the primary role of the inductor in a buck converter?

• Stabilize input voltage

• Limit output current

• Store energy during the switch-on period and release it during the switch-off period

• Filter the input

The voltage ripple in a buck converter can be reduced by:

• Increasing the inductor size

• Increasing the switching frequency

• Adding a larger output capacitor

• All of the above

In a buck converter, increasing the load resistance will:

• Increase output current

• Decrease output voltage

• Decrease output current

• Increase input voltage

For which application is a buck converter most suitable?

• Step-up power supply

• High-voltage DC applications

• Reducing voltage in a DC-to-DC converter

• Amplifying small signals

In a buck converter, as the duty cycle increases, the output voltage:

• Increases

• Decreases

• Remains constant

• Is unaffected by the duty cycle