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25 Cards in this Set
- Front
- Back
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What kind of supply can a 3 phase half wave rectifier be connected to? |
4 wire wye |
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In a 3 phase half wave rectifier one diode conducts for how many electrical degrees? |
120 |
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A diode pair in a 3 phase full wave rectifier conducts for how many electrical degrees? |
60 |
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What are the 2 main parts of a battery charger? |
1.transformer 2.rectifier |
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What happens to DC voltage when a cap filter circuits load is doubled? |
Average voltage goes down |
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What happens to AC ripple voltage in a cap filter circuit when the load is doubled? |
AC ripple voltage goes up |
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In a cap filter circuit what happens to percent ripple when load is doubled? |
Goes up |
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What is output voltage equal to with no load? |
Peak voltage |
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What happens to DC voltage in a choke filter when load is doubled? |
DC average voltage goes up |
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What happens to AC ripple voltage in a choke filter when load doubles |
AC ripple voltage goes down |
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What happens to percent ripple in a choke filter circuit when load doubles? |
Percent ripple goes down |
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What happens to DC voltage in a L-section filter circuit when load is doubled? |
DC average voltage goes up |
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What happens to AC ripple voltage in a L-section filter circuit when load is doubled ? |
AC ripple voltage goes down |
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What happens to percent ripple in a L-section filter circuit when load is doubled? |
Percent ripple goes down |
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What are the important ratings when testing or replacing a resistor ? |
Watts,ohms,tolerance, max voltage |
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What are the tolerance percentages for silver, gold, and no band? |
Silver is 10% gold is 5% no band is 20% |
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What are the 3 characteristic that affect capacitance of a capacitor? |
1.surface area of the plates 2.distance between the plates 3.dielectric constant between the plates |
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As load is added to a cap filter what happens to the amount of ripple? |
Goes up. Caps effectiveness goes down |
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Cap filters are good for what kind of loads? |
Light loads |
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What happens to the ripple and the effectiveness of the choke filter when load is increased? |
Goes up better ripple |
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Choke filters are good for what type of loads? |
Heavy loads |
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The main 3 sections of a welder are? |
1.transformer 2.rectifier 3.filter |
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A varistor or surge protection on a welder provides what? |
Protect diode from high voltage spikes |
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When capacitors are connected across tge diodes this helps with aiding the diodes off and is known as? |
Commutation |
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How many diodes will conduct at once in a 3 phase full wave? |
1 diode pair |
