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289 lines
4.0 KiB
Plaintext
289 lines
4.0 KiB
Plaintext
% FILENAME = N9.TXTR
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% Capacitors, Inductors, Resonance
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% Release version 2, January 2000
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% Q 3 deleted "radio" 6 Mar 2012. PDF is corrected already
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%Question: 1
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#9.1 The total capacitance of two or more capacitors in series is:
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always less than that of the smallest capacitor
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always greater than that of the largest capacitor
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found by adding each of the capacitances together
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found by adding the capacitances together and dividing by their total number
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% ans 1
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%Question: 2
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#9.2 Filter capacitors in power supplies are sometimes connected in series to:
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withstand a greater voltage than a single capacitor can withstand
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increase the total capacity
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reduce the ripple voltage further
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resonate the filter circuit
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% ans 1
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%Question: 3
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#9.3 A component is identified as a capacitor if its value is measured
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in:
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microvolts
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millihenrys
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megohms
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microfarads
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% ans 4
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%Question: 4
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#9.4 Two metal plates separated by air form a 0.001 uF capacitor. Its value may
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be changed to 0.002 uF by:
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bringing the metal plates closer together
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making the plates smaller in size
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moving the plates apart
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touching the two plates together
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% ans 1
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%Question: 5
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#9.5 The material separating the plates of a capacitor is the:
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dielectric
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semiconductor
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resistor
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lamination
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% ans 1
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%Question: 6
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#9.6 Three 15 picofarad capacitors are wired in parallel. The value of the
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combination is:
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45 picofarad
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18 picofarad
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12 picofarad
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5 picofarad
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% ans 1
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%Question: 7
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#9.7 Capacitors and inductors oppose an alternating current. This is known as:
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resistance
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resonance
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conductance
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reactance
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% ans 4
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%Question: 8
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#9.8 The reactance of a capacitor increases as the:
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frequency increases
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frequency decreases
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applied voltage increases
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applied voltage decreases
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% ans 2
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%Question: 9
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#9.9 The reactance of an inductor increases as the:
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frequency increases
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frequency decreases
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applied voltage increases
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applied voltage decreases
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% ans 1
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%Question: 10
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#9.10 Increasing the number of turns on an inductor will make its inductance:
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decrease
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increase
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remain unchanged
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become resistive
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% ans 2
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%Question: 11
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#9.11 The unit of inductance is the:
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farad
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henry
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ohm
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reactance
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% ans 2
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%Question: 12
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#9.12 Two 20 uH inductances are connected in series. The total inductance is:
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10 uH
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20 uH
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40 uH
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80 uH
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% ans 3
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%Question: 13
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#9.13 Two 20 uH inductances are connected in parallel. The total inductance is:
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10 uH
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20 uH
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40 uH
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80 uH
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% ans 1
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%Question: 14
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#9.14 A toroidal inductor is one in which the:
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windings are wound on a closed ring of magnetic material
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windings are air-spaced
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windings are wound on a ferrite rod
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inductor is enclosed in a magnetic shield
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% ans 1
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%Question: 15
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#9.15 A transformer with 100 turns on the primary winding and 10 turns on the
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secondary winding is connected to 230 volt AC mains. The voltage across the
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secondary is:
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10 volt
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23 volt
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110 volt
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2300 volt
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% ans 2
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%Question: 16
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#9.16 An inductor and a capacitor are connected in series. At the resonant
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frequency the resulting impedance is:
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maximum
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minimum
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totally reactive
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totally inductive
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% ans 2
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%Question: 17
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#9.17 An inductor and a capacitor are connected in parallel. At the resonant
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frequency the resulting impedance is:
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maximum
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minimum
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totally reactive
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totally inductive
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% ans 1
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%Question: 18
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#9.18 An inductor and a capacitor form a resonant circuit. The capacitor value
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is increased by four times. The resonant frequency will:
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increase by four times
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double
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decrease to half
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decrease to one quarter
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% ans 3
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%Question: 19
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#9.19 An inductor and a capacitor form a resonant circuit. If the value of the
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inductor is decreased by a factor of four, the resonant frequency will:
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increase by a factor of four
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increase by a factor of two
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decrease by a factor of two
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decrease by a factor of four
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% ans 2
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%Question: 20
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#9.20 A "high Q" resonant circuit is one which:
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carries a high quiescent current
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is highly selective
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has a wide bandwidth
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uses a high value inductance
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% ans 2
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