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| 1.
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What is the purpose of a crowbar circuit? |
| | A) | to protect the load from over temperature |
| | B) | to protect the load from over current |
| | C) | to protect the load from over voltage |
| | D) | none of the above |
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| 2.
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Determine Vout for the circuit shown below.
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| | A) | 15 V |
| | B) | 12 V |
| | C) | 9 V |
| | D) | 6 V |
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| 3.
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The power supply design that converts dc to ac and then back to dc again is the: |
| | A) | converter |
| | B) | step-up configuration |
| | C) | inverting configuration |
| | D) | step-down configuration |
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| 4.
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Switch-mode power supplies regulate output voltage via: |
| | A) | PWM |
| | B) | AM |
| | C) | FM |
| | D) | PPM |
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| 5.
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What is the function of Q1 in the circuit shown below?
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| | A) | pass transistor |
| | B) | switching transistor |
| | C) | error amplifier |
| | D) | all of the above |
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| 6.
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What is the function of Q2 in the circuit shown below?
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| | A) | pass transistor |
| | B) | switching transistor |
| | C) | error amplifier |
| | D) | all of the above |
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| 7.
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Determine Vout for the circuit shown below assuming Vin = 30 volts.
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0073106941/443736/image084.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (4.0K)</a>]]> |
| | A) | 21 V |
| | B) | 16 V |
| | C) | 11 V |
| | D) | 5 V |
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| 8.
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What is the function of Q1 in the circiuit shown below?
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0073106941/443736/image085.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (4.0K)</a>]]> |
| | A) | pass transistor |
| | B) | switching transistor |
| | C) | error amplifier |
| | D) | all of the above |
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| 9.
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What type of current limiting is used in the circuit shown below?
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0073106941/443736/image086.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (6.0K)</a>]]> |
| | A) | switchmode |
| | B) | foldback |
| | C) | conventional |
| | D) | none |
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| 10.
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Determine VRL for the circuit shown below.
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| | A) | 19.3 V |
| | B) | 12.7 V |
| | C) | 11.6 V |
| | D) | 10.1 V |
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| 11.
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The major disadvantage of switch-mode power supplies is: |
| | A) | greater weight |
| | B) | larger size |
| | C) | poor efficiency |
| | D) | none of the above |
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