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SUBELEMENT G6 -- CIRCUIT COMPONENTS
[1 exam question -- 1 group]

G6A Resistors; capacitors; inductors; rectifiers and transistors; etc.

G6A01
If a carbon resistor's temperature is increased, what will happen to the resistance?
A. It will increase by 20% for every 10 degrees centigrade
B. It will stay the same
C. It will change depending on the resistor's temperature coefficient rating
D. It will become time dependent

G6A02
What type of capacitor is often used in power-supply circuits to filter the rectified AC?
A. Disc ceramic
B. Vacuum variable
C. Mica
D. Electrolytic

G6A03
What function does a capacitor serve if it is used in a power-supply circuit to filter transient voltage spikes across the transformer's secondary winding?
A. Clipper capacitor
B. Trimmer capacitor
C. Feedback capacitor
D. Suppressor capacitor

G6A04
Where is the source of energy connected in a transformer?
A. To the secondary winding
B. To the primary winding
C. To the core
D. To the plates

G6A05
If no load is attached to the secondary winding of a transformer, what is current in the primary winding called?
A. Magnetizing current
B. Direct current
C. Excitation current
D. Stabilizing current

G6A06
What is the peak-inverse-voltage rating of a power-supply rectifier?
A. The maximum transient voltage the rectifier will handle in the conducting direction
B. 1.4 times the AC frequency
C. The maximum voltage the rectifier will handle in the non-conducting direction
D. 2.8 times the AC frequency

G6A07
What are the two major ratings that must not be exceeded for silicon-diode rectifiers used in power-supply circuits?
A. Peak inverse voltage; average forward current
B. Average power; average voltage
C. Capacitive reactance; avalanche voltage
D. Peak load impedance; peak voltage

G6A08
What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?
A. A series of pulses at twice the frequency of the AC input
B. A series of 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

G6A09
A half-wave rectifier conducts during how many degrees of each cycle?
A. 90 degrees
B. 180 degrees
C. 270 degrees
D. 360 degrees

G6A10
A full-wave rectifier conducts during how many degrees of each cycle?
A. 90 degrees
B. 180 degrees
C. 270 degrees
D. 360 degrees

G6A11
When two or more diodes are connected in parallel to increase the current-handling capacity of a power supply, what is the purpose of the resistor connected in series with each diode?
A. The resistors ensure the thermal stability of the power supply
B. The resistors regulate the power supply output voltage
C. The resistors ensure that one diode doesn't take most of the current
D. The resistors act as swamping resistors in the circuit

G6A12
Why would it not be a good idea to use a wire-wound resistor in a resonant circuit?
A. The resistor's tolerance value would not be adequate for such a circuit
B. The resistor's inductance would detune the circuit
C. The resistor would overheat
D. The resistor's internal capacitance would detune the circuit

G6A13
What is an advantage of ferrite toroidal inductors?
A. Large values of inductance may be obtained
B. The inductor may be used in applications where core saturation is desirable
C. Most of the magnetic field is contained in the core
D. All of these choices are correct

G6A14
Where would be the stable operating points for a bipolar transistor that is used as a switch in a logic circuit?
A. In its saturation and cut-off regions
B. In its active region (between cut-off and saturation regions)
C. Between its peak and valley current points
D. Between its enhancement and deletion modes

G6A15
How should two solenoid inductors be placed so as to minimize their mutual inductance?
A. In line with their winding axis
B. With their winding axis parallel to each other
C. At right angles to their winding axis
D. Within the same shielded enclosure

G6A16
Why might it be important to minimize the mutual inductance between two inductors?
A. To increase the energy transfer between both circuits
B. To reduce or eliminate stray coupling between RF stages
C. To reduce conducted emissions
D. To increase the self-resonant frequency of both inductors

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