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What is the expected dc voltage below at the junction of Q3 and Q4?
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| | A) | depends on the INPUT |
| | B) | 12 V |
| | C) | 6 V |
| | D) | 0 V |
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| 2.
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What is the usual method of eliminating crossover distortion in push-pull amplifiers? |
| | A) | use class AB bias instead of class B |
| | B) | use complementary symmetry output transistors |
| | C) | use the emitter follower configuration instead of transformer coupling |
| | D) | all of the above |
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| 3.
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Which amplifier class typically uses pulse width modulation? |
| | A) | D |
| | B) | C |
| | C) | B |
| | D) | A |
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| 4.
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A power amplifier takes 2.5 amperes from a 48 volt power supply when providing 72 watts of useful output. What is its efficiency? |
| | A) | 72% |
| | B) | 60% |
| | C) | 50% |
| | D) | none of the above |
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| 5.
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A power amplifier with poor efficiency: |
| | A) | requires a bigger power supply than an efficient one |
| | B) | generates more heat than an efficient one |
| | C) | costs more to operate than an efficient one |
| | D) | all of the above |
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| 6.
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Which of the following amplifier classes shows the poorest efficiency? |
| | A) | D |
| | B) | C |
| | C) | B |
| | D) | A |
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| 7.
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Identify the amplifier shown below:
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| | A) | cascode power amplifier |
| | B) | Class D switchmode amplifier |
| | C) | Class C radio frequency power amplifier |
| | D) | quasi-complementary symmetry amplifier |
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| 8.
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What is the expected dc voltage below at the OUTPUT terminal?
 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0073106941/443736/image039.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) | depends on the INPUT |
| | B) | 12 V |
| | C) | 6 V |
| | D) | 0 V |
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| 9.
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Which components below provide dc operating point stability with temperature change?
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| | A) | the diodes |
| | B) | the load resistor (RL) |
| | C) | the output transistors |
| | D) | the coupling capacitors |
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| 10.
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How does a Class C power amplifier achieve a sinusoidal output signal? |
| | A) | by using a tank circuit |
| | B) | by using fixed bias |
| | C) | by using drive bias |
| | D) | all of the above |
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