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