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