Practice Test (See related pages) 1 The resonance effect occurs when the inductive and capacitive reactances are not equal. A) True B) False 2 Tuning by means of the resonant effect provides a practical application of sensitivity. A) True B) False 3 The frequency at which the opposite reactances are equal is the resonant frequency. A) True B) False 4 The most common application of resonance in rf circuits is called oscillating. A) True B) False 5 At higher frequencies, skin effect causes coil resistance to be higher than the coil's dc resistance alone. A) True B) False 6 At resonance the resonant current is out of phase with the generator voltage. A) True B) False 7 The advantage of a parallel resonant LC circuit is that Z is maximum only for an ac signal at the resonant frequency. A) True B) False 8 In a parallel resonant circuit, the line current IT is maximum at the resonant frequency. A) True B) False 9 A test instrument used to measure inductance or capacitance is the wattmeter. A) True B) False 10 Capacitors used in tuned circuits generally have high Q because of their low . 11 The width of the resonant band of frequencies centered around fr is called the . 12 High Q results in bandwidth. 13 Obtaining resonance at different frequencies by varying either L or C is called . 14 The ability of an LC circuit to supply complete sine waves is called the effect. 15 The is a numerical factor without any units, because it is a ratio of reactance to resistance and the ohms cancel. 16 The of a resonant circuit can be considered a magnification factor that determines how much the voltage across L or C is increased by the resonant rise of current in a series circuit. 17 The lower the Q, the the resonant response and the greater the bandwidth. 18 What is used to indicate the quality, or figure of merit of a resonant circuit? A) Σ B) λ C) Q D) β 19 What is the Q of a series circuit that is resonant at 1.0 MHz and develops 50 mV across a 250-μH L with a 2-mV input? A) 50 B) 25 C) 125 D) 100 20 The lower the Q A) the more narrow the bandwidth B) the sharper the resonance C) the greater the bandwidth D) the greater the selectivity 21 What is a semiconductor device that varies in capacitance when its voltage is changed? A) zener diode B) tunnel diode C) varactor diode D) light-emitting diode 22 What is a semiconductor device that varies in capacitance when its voltage is changed? A) zener diode B) tunnel diode C) varactor diode D) light-emitting diode 23 In radio frequency circuits, the main application of resonance is A) filtering B) oscillating C) tuning D) coupling 24 What causes the coil resistance to become higher than the coil's dc resistance at higher frequencies? A) inductive reactance B) capacitive reactance C) magnetic effect D) skin effect 25 What is the result of plotting frequencies at and near the resonant frequency on a graph? A) Bode plot B) response curve C) reactive curve D) resonant plot
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