Practice Test (See related pages) 1 An electrical filter cannot separate different frequency components. A) True B) False 2 Generally, inductors and capacitors are used for filtering because of their opposite frequency characteristics. A) True B) False 3 The amount of attenuation offered by a filter is usually specified in milliwatts. A) True B) False 4 For audio mixed with radio frequencies, a high-pass filter allows the audio frequencies in the output. A) True B) False 5 Current that varies in amplitude but does not reverse in polarity is considered dc. A) True B) False 6 The size of a coupling capacitor depends on the frequency of the accomponent. A) True B) False 7 Capacitors are often used in parallel with resistance to bypass the ac component of a pulsating dc voltage. A) True B) False 8 A coupling capacitor couples the dc signal to R and the shunt bypass capacitor short-circuits R for the dc signal. A) True B) False 9 An ideal filter would offer infinite attenuation within the passband and zero attenuation throughout the stop band. A) True B) False 10 A filter that allows the higher frequency components of the applied voltage to develop voltage across the output load resistance is a filter. 11 The ability of any filter to reduce the amplitude of undesired frequencies is called . 12 The frequency at which the attenuation reduces the output to 70.7% is the frequency. 13 A logarithmic expression that compares two power levels is the . 14 In the application of a band-stop filter to suppress certain frequencies, the LC circuit is often called a . 15 The ability of any filter to reduce the of undesired frequencies is called attenuation of the filter. 16 A filter is also called a notch filter. 17 The frequency response of a filter is typically shown by plotting its gain or loss versus on logarithmic graph paper. 18 Which of the following is not a common type LC filter? A) L B) T C) H D) π 19 What type filter passes to the load all frequencies higher than the cut-off frequency? A) low-pass filter B) high-pass filter C) band-pass filter D) band-stop filter 20 What type filter uses a high-pass filter combined with a low-pass filter in order to pass only a certain band of frequencies? A) low-pass filter B) high-pass filter C) band-pass filter D) band-stop filter 21 A reduction in power, corresponding to a loss in decibels is referred to as A) attrition B) attenuation C) reduction D) scaling 22 On logarithmic graph paper, a 10-to-1 range of values is called a(n) A) octave B) decade C) binary D) hexadecimal 23 What is the characteristic of some crystals that causes them to vibrate by a voltage input or produce voltage output when compressed, expanded, or twisted? A) conductivity B) resonance C) piezoelectricity D) harmonics 24 Just about the most common type coupling in amplifier circuits is A) capacitive B) direct C) transformer D) impedance 25 With an ideal filter, what attenuation should exist within the passband? A) infinite B) zero C) 100 kΩ D) 10 MΩ
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