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
	- D. Impedance is equal to the arithmetic mean of the inductance and capacitance
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- [[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
	- D. Reinforcement of the flow of alternating current caused by capacitance or inductance
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- [[G5A03]] (D)
Which of the following is opposition to the flow of alternating current in an inductor?
	- A. Conductance
	- B. Reluctance
	- C. Admittance
	- D. Reactance
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- [[G5A04]] (C)
Which of the following is opposition to the flow of alternating current in a capacitor?
	- A. Conductance
	- B. Reluctance
	- C. Reactance
	- D. Admittance
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- [[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
	- D. As the frequency of the applied AC increases, the reactance increases
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- [[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
	- D. As the amplitude of the applied AC increases, the reactance decreases
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- [[G5A07]] (D)
What is the term for the inverse of impedance?
	- A. Conductance
	- B. Susceptance
	- C. Reluctance
	- D. Admittance
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- [[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
	- D. The product of current and reactance 
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- [[G5A09]] (B)
What unit is used to measure reactance?
	- A. Farad
	- B. Ohm
	- C. Ampere
	- D. Siemens
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- [[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
	- D. All these choices are correct
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- [[G5A11]] (B)
What letter is used to represent reactance?
	- A. Z
	- B. X
	- C. B
	- D. Y
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- [[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