FORMATIF ASSESSMENT: TOPIC 3

What is the function of dc chopper

• convert DC to AC

• convert DC to DC

• convert AC to DC

• convert AC to AC

The output voltage, Vo of step down chopper must ________than input voltage.

• more

• less

• equal

• end

A buck converter is supplied from 50V battery source. Given L=400uH, C=100uF, R=20Ohm, f=20KHz and D=0.4. Calculate the average output voltage Vo for this converter.

• 20V

• 30V

• 100V

• 125V

Choose the correct diagram for boost converter

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• 
• 

The boost converter has the following parameters: Vd=20V,

D=0.6, R=12.5Ω, L=65uH, C=200uF, fs=40KHz. Determine the output voltage.

• 10V

• 30V

• 50V

• 60V

A transistor dc chopper circuit (Buck converter) is supplied

with power form an ideal battery of 100 V. The load voltage

waveform consists of rectangular pulses of duration 1 ms in an

overall cycle time of 2.5 ms. Calculate the duty cycle, D for resistive load of 10Ω.

• 0.1

• 2.5

• 0.2

• 0.4

The output voltage, Vo of boost chopper must ________than input voltage.

• Less

• More

• Equal

• Same

•Buck Converter is a __________

• step down converter

• AC-DC converter

• step up converter

• AC-AC converter

All equation below can find the duty cycle, accept

What is the duty cycle of a chopper

• Ton/Toff

• TonxToff

• T/Toff

• Ton/T