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| 1.
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A servomechanism oscillates several times when commanded to a new position. This response is called: |
| | A) | under damped |
| | B) | over damped |
| | C) | critically damped |
| | D) | none of the above |
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| 2.
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What is the device labeled D1 in the circuit drawn below?
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| | A) | UJT |
| | B) | DIAC |
| | C) | TRIAC |
| | D) | SCR |
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| 3.
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In the circuit shown below, what are C1 and the 100 mH coil for?
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| | A) | RFI filter |
| | B) | transient filter |
| | C) | they limit surge current when the lamp filament is cold |
| | D) | phase control |
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| 4.
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The name often used to describe the circuit below is:
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| | A) | latch |
| | B) | phase control |
| | C) | bidirectional control |
| | D) | resistance control |
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| 5.
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What is the device labeled D2 in the circuit shown below?
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| | A) | UJT |
| | B) | DIAC |
| | C) | TRIAC |
| | D) | SCR |
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| 6.
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The name often used to describe the circuit below is:
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0073106941/443736/image077.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"> (3.0K)</a>]]> |
| | A) | latch |
| | B) | phase control |
| | C) | bidirectional control |
| | D) | resistance control |
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| 7.
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Assume, for the circuit below, that the power switch has just been closed. The condition of the LAMP is:
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0073106941/443736/image078.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) | blinking off and on |
| | B) | dim |
| | C) | on |
| | D) | off |
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| 8.
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Assume that the gate switch shown below is closed and then opened. What is the response?
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| | A) | the LAMP comes on dim and then back off |
| | B) | the LAMP comes on and stays on |
| | C) | the LAMP comes on and then goes back off |
| | D) | none of the above |
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| 9.
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What is the device labeled D1 in the circuit drawn below?
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0073106941/443736/image080.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"> (5.0K)</a>]]> |
| | A) | UJT |
| | B) | DIAC |
| | C) | TRIAC |
| | D) | SCR |
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| 10.
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The most serious limitation to resistance control in high power circuits is: |
| | A) | poor efficiency |
| | B) | high-power variable resistors cannot be manufactured |
| | C) | continuous control to full power is not possible |
| | D) | all of the above |
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