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