75 lines
2.9 KiB
Markdown
75 lines
2.9 KiB
Markdown
G5A – Reactance; inductance; capacitance; impedance; impedance transformation; resonance
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- [[G5A01]] (C)
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What happens when inductive and capacitive reactance are equal in a series LC circuit? #card
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- A. Resonance causes impedance to be very high
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- B. Impedance is equal to the geometric mean of the inductance and capacitance
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- C. Resonance causes impedance to be very low
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- D. Impedance is equal to the arithmetic mean of the inductance and capacitance
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- [[G5A02]] (B)
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What is reactance? #card
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- A. Opposition to the flow of direct current caused by resistance
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- B. Opposition to the flow of alternating current caused by capacitance or inductance
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- C. Reinforcement of the flow of direct current caused by resistance
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- D. Reinforcement of the flow of alternating current caused by capacitance or inductance
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- [[G5A03]] (D)
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Which of the following is opposition to the flow of alternating current in an inductor? #card
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- A. Conductance
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- B. Reluctance
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- C. Admittance
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- D. Reactance
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- [[G5A04]] (C)
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Which of the following is opposition to the flow of alternating current in a capacitor? #card
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- A. Conductance
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- B. Reluctance
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- C. Reactance
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- D. Admittance
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- [[G5A05]] (D)
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How does an inductor react to AC? #card
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- A. As the frequency of the applied AC increases, the reactance decreases
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- B. As the amplitude of the applied AC increases, the reactance increases
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- C. As the amplitude of the applied AC increases, the reactance decreases
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- D. As the frequency of the applied AC increases, the reactance increases
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- [[G5A06]] (A)
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How does a capacitor react to AC? #card
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- A. As the frequency of the applied AC increases, the reactance decreases
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- B. As the frequency of the applied AC increases, the reactance increases
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- C. As the amplitude of the applied AC increases, the reactance increases
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- D. As the amplitude of the applied AC increases, the reactance decreases
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- [[G5A07]] (D)
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What is the term for the inverse of impedance? #card
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- A. Conductance
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- B. Susceptance
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- C. Reluctance
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- D. Admittance
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- [[G5A08]] (C)
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What is impedance? #card
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- A. The ratio of current to voltage
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- B. The product of current and voltage
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- C. The ratio of voltage to current
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- D. The product of current and reactance
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- [[G5A09]] (B)
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What unit is used to measure reactance? #card
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- A. Farad
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- B. Ohm
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- C. Ampere
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- D. Siemens
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- [[G5A10]] (D)
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Which of the following devices can be used for impedance matching at radio frequencies? #card
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- A. A transformer
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- B. A Pi-network
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- C. A length of transmission line
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- D. All these choices are correct
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- [[G5A11]] (B)
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What letter is used to represent reactance? #card
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- A. Z
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- B. X
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- C. B
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- D. Y
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- [[G5A12]] (D)
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What occurs in an LC circuit at resonance?
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- A. Current and voltage are equal
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- B. Resistance is cancelled
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- C. The circuit radiates all its energy in the form of radio waves
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- D. Inductive reactance and capacitive reactance cancel
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