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What is the purpose of D1 in the circuit shown above? |
| | A) | keep the RF signal out of the dc bias circuits |
| | B) | sets a reference voltage when X1 is selected |
| | C) | connects X1to ground when selected |
| | D) | keeps X2 off |
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What is the purpose of the RFCs in the circuit shown above? |
| | A) | keep the RF signal out of the dc bias circuits |
| | B) | sets a reference voltage when X1 is selected |
| | C) | form an oscillator with capacitors C1 and C2 |
| | D) | connect the RF signal to the dc bias circuits |
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Variable-frequency generators that provide the frequency stability of crystal oscillators along with incremental tuning are called |
| | A) | PLLs |
| | B) | VCOs |
| | C) | frequency synthesizers |
| | D) | harmonic generators |
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A circuit whose output frequency is some integer submultiple of the input frequency is a(n) |
| | A) | overtone oscillator |
| | B) | frequency divider |
| | C) | harmonic generator |
| | D) | frequency multiplier |
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Which class of amplifier is not linear? |
| | A) | A |
| | B) | AB |
| | C) | B |
| | D) | C |
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Which of the following amplifiers is used between the carrier oscillator and the final power amplifier to isolate the oscillator from the load? |
| | A) | class A buffer |
| | B) | high-power linear |
| | C) | class B push-pull |
| | D) | class C |
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What biasing method is used by the circuit shown in above? |
| | A) | fixed |
| | B) | external |
| | C) | self-bias |
| | D) | internal |
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The exchange of energy between an inductor and a capacitor in a parallel tank circuit is referred to as the |
| | A) | flywheel effect |
| | B) | derating factor |
| | C) | harmonic generation |
| | D) | resonant frequency |
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Multipliers can be constructed to increase the input frequency by any integer up to approximately |
| | A) | 2 |
| | B) | 3 |
| | C) | 6 |
| | D) | 10 |
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A device’s interelement capacitance can be compensated for by feeding a 180° out of phase signal back through a capacitor in a process called |
| | A) | digitization |
| | B) | internal compensation |
| | C) | neutralization |
| | D) | phasing |
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