21. Which of the following instruments displays the harmonics of a distorted signal?
(a) Digital multimeter
(b) Spectrum analyzer
(c) Oscilloscope
(d) Wave analyzer
22. Calculate the effective resistance seen looking into the primary of a 20:1 transformer connected to an 8 Ω load.
(a) 3.2 kΩ
(b) 3.0 kΩ
(c) 2.8 kΩ
(d) 1.8 kΩ
23. The main features of a large-signal amplifier is the circuit’s ________.
(a) power efficiency
(b) maximum power limitations
(c) impedance matching to the output device
(d) All of the above
24. Which operation class is generally used in radio or communications?
(a) A
(b) B
(c) AB
(d) C
25. Nota
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