81 lines
2.6 KiB
Markdown
81 lines
2.6 KiB
Markdown
G7A – Power supplies; schematic symbols
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- [[G7A01]] (B)
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What is the function of a power supply bleeder resistor?
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- A. It acts as a fuse for excess voltage
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- B. It discharges the filter capacitors when power is removed
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- C. It removes shock hazards from the induction coils
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- D. It eliminates ground loop current
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- [[G7A02]] (C)
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Which of the following components are used in a power supply filter network?
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- A. Diodes
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- B. Transformers and transducers
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- C. Capacitors and inductors
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- D. All these choices are correct
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- [[G7A03]] (A)
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Which type of rectifier circuit uses two diodes and a center-tapped transformer?
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- A. Full-wave
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- B. Full-wave bridge
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- C. Half-wave
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- D. Synchronous
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- [[G7A04]] (A)
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What is characteristic of a half-wave rectifier in a power supply?
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- A. Only one diode is required
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- B. The ripple frequency is twice that of a full-wave rectifier
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- C. More current can be drawn from the half-wave rectifier
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- D. The output voltage is two times the peak input voltage
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- [[G7A05]] (B)
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What portion of the AC cycle is converted to DC by a half-wave rectifier?
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- A. 90 degrees
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- B. 180 degrees
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- C. 270 degrees
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- D. 360 degrees
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- [[G7A06]] (D)
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What portion of the AC cycle is converted to DC by a full-wave rectifier?
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- A. 90 degrees
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- B. 180 degrees
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- C. 270 degrees
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- D. 360 degrees
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- [[G7A07]] (A)
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What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?
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- A. A series of DC pulses at twice the frequency of the AC input
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- B. A series of DC pulses at the same frequency as the AC input
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- C. A sine wave at half the frequency of the AC input
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- D. A steady DC voltage
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- [[G7A08]] (C)
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Which of the following is characteristic of a switchmode power supply as compared to a linear power supply?
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- A. Faster switching time makes higher output voltage possible
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- B. Fewer circuit components are required
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- C. High-frequency operation allows the use of smaller components
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- D. Inherently more stable
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- [[G7A09]] (C)
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Which symbol in figure G7-1 represents a field effect transistor?
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- A. Symbol 2
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- B. Symbol 5
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- C. Symbol 1
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- D. Symbol 4
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- [[G7A10]] (D)
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Which symbol in figure G7-1 represents a Zener diode?
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- A. Symbol 4
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- B. Symbol 1
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- C. Symbol 11
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- D. Symbol 5
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- [[G7A11]] (B)
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Which symbol in figure G7-1 represents an NPN junction transistor?
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- A. Symbol 1
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- B. Symbol 2
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- C. Symbol 7
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- D. Symbol 11
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- [[G7A12]] (C)
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Which symbol in Figure G7-1 represents a solid core transformer?
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- A. Symbol 4
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- B. Symbol 7
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- C. Symbol 6
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- D. Symbol 1
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- [[G7A13]] (A)
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Which symbol in Figure G7-1 represents a tapped inductor?
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- A. Symbol 7
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- B. Symbol 11
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- C. Symbol 6
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- D. Symbol 1
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