E6B Diodes: Zener, tunnel, varactor,
hot-carrier, junction, point
contact, PIN and light emitting; operational amplifiers (inverting
amplifiers, noninverting amplifiers, voltage gain, frequency
response, FET amplifier circuits, single-stage amplifier
applications); phase-locked loops
E6B01
(B)
What is
the principal characteristic of a Zener diode?
A. A constant current under conditions of
varying voltage
B. A constant voltage under
conditions of varying current
C. A negative resistance region
D. An internal capacitance that varies with the
applied voltage
E6B02
(C)
What is
the principal characteristic of a tunnel diode?
A. A high forward resistance
B. A very high PIV
C. A negative resistance
region
D. A high forward current rating
E6B03
(C)
What
special type of diode is capable of both amplification and oscillation?
A. Point contact
B. Zener
C. Tunnel
D. Junction
E6B04
(A)
What
type of semiconductor diode varies its internal capacitance as the voltage
applied to its terminals varies?
A. Varactor
B. Tunnel
C. Silicon-controlled rectifier
D. Zener
E6B05
(D)
In
Figure A6-1, what is the schematic symbol for a varactor diode?
A. 8
B. 6
C. 2
D. 1
E6B06
(D)
What is
a common use of a hot-carrier diode?
A. As balanced mixers in FM generation
B. As a variable capacitance in an automatic
frequency control circuit
C. As a constant voltage reference in a power
supply
D. As VHF and UHF mixers and
detectors
E6B07
(B)
What
limits the maximum forward current in a junction diode?
A. Peak inverse voltage
B. Junction temperature
C. Forward voltage
D. Back EMF
E6B08
(A)
Structurally,
what are the two main categories of semiconductor diodes?
A. Junction and point
contact
B. Electrolytic and junction
C. Electrolytic and point contact
D. Vacuum and point contact
E6B09
(C)
What is
a common use for point contact diodes?
A. As a constant current source
B. As a constant voltage source
C. As an RF detector
D. As a high voltage rectifier
E6B10
(B)
In
Figure A6-1, what is the schematic symbol for a light-emitting diode?
A. 1
B. 5
C. 6
D. 7
E6B11
(A)
What is
the phase relationship between the input and output signals of an inverting
op-amp circuit?
A. 180 degrees out of phase
B. In phase
C. 90 degrees out of phase
D. 60 degrees out of phase
E6B12
(C)
What
voltage gain can be expected from the circuit in Figure E7-1 when R1 is 10 ohms
and RF is 47 kilohms?
A. 0.00021
B. 9400
C. 4700
D. 2350
E6B13
(D)
How
does the gain of a theoretically ideal operational amplifier vary with
frequency?
A. It increases linearly with increasing
frequency
B. It decreases linearly with increasing
frequency
C. It decreases logarithmically with increasing
frequency
D. It does not vary with
frequency
E6B14
(A)
What
essentially determines the output impedance of a FET common-source amplifier?
A. The drain resistor
B. The input impedance of the FET
C. The drain supply voltage
D. The gate supply voltage
E6B15
(D)
What
will be the voltage of the circuit shown in Figure E7-1 if R1 is 1000 ohms and
RF is 10,000 ohms and 2.3 volts is applied to the input?
A. 2.3 volts
B. 23 volts
C. -2.3 volts
D. -23 volts
E6B16
(B)
What is
the name of a circuit that compares the difference of the output from a
voltage-controlled oscillator (VCO) to a frequency standard and produces an
error voltage that changes the VCO's frequency?
A. A doubly balanced mixer
B. A phase-locked loop
C. A differential voltage amplifier
D. A variable frequency oscillator
E6B17
(A)
What is
the capture range of a phase-locked loop circuit?
A. The frequency range over
which the circuit can lock
B. The voltage range over which the circuit can
lock
C. The input impedance range over which the
circuit can lock
D. The range of time it takes the circuit to lock