UPPCL EE : Power electronics Quiz 3

The Duty ratio of given circuit is

In line frequency phase-controlled converters and single-quadrant step-down switch-mode d.c.-d.c. converters, the output current can become

A buck regulator has an input voltage of 12V and the required output voltage is 5V. What is the duty cycle of the regulator?

Statement I: Second quadrant or type B chopper is used for regenerative braking applications.

Statement II: The flow of power in type B chopper is from source to load.

For a chopper, consider two inductor currents.

For inductor L₁ →

For inductor L₂ →

Then

If the duty ratio of a type A Chopper is 2/5 then the ripple factor is

A step down chopper operating with 50% duty cycle has an average output voltage of 100V. If the average load current is 200A then the equivalent input resistance of chopper drive is:

Statement I: A chopper is DC equivalent to an AC transformer.

Statement II: A chopper can be used to step up and step down the fixed dc input voltage.

A boost converter is operating with a duty ratio of 0.5. If input current is 30 A and circuit is operating in continuous conduction mode, then the rms value of switch current is:

Step down chopper is used for