E4B Frequency measurement devices
(i.e., frequency counter,
oscilloscope Lissajous figures, dip meter); meter performance
limitations; oscilloscope performance limitations; frequency counter
performance limitations
E4B01
(B)
What is
a frequency standard?
A. A frequency chosen by a net control operator
for net operations
B. A device used to produce
a highly accurate reference frequency
C. A device for accurately measuring frequency
to within 1 Hz
D. A device used to generate wide-band random
frequencies
E4B02
(A)
What
does a frequency counter do?
A. It makes frequency
measurements
B. It produces a reference frequency
C. It measures FM transmitter deviation
D. It generates broad-band white noise
E4B03
(B)
What
factors limit the accuracy, frequency response and stability of a frequency
counter?
A. Number of digits in the readout, speed of
the logic and time base stability
B. Time base accuracy, speed
of the logic and time base stability
C. Time base accuracy, temperature coefficient
of the logic and time base stability
D. Number of digits in the readout, external
frequency reference and temperature coefficient of the logic
E4B04
(C)
How can
the accuracy of a frequency counter be improved?
A. By using slower digital logic
B. By improving the accuracy of the frequency
response
C. By increasing the
accuracy of the time base
D. By using faster digital logic
E4B05
(C)
If a
frequency counter with a time base accuracy of +/- 1.0 ppm reads 146,520,000
Hz, what is the most the actual frequency being measured could differ from the
reading?
A. 165.2 Hz
B. 14.652 kHz
C. 146.52 Hz
D. 1.4652 MHz
E4B06
(A)
If a
frequency counter with a time base accuracy of +/- 0.1 ppm reads 146,520,000
Hz, what is the most the actual frequency being measured could differ from the
reading?
A. 14.652 Hz
B. 0.1 MHz
C. 1.4652 Hz
D. 1.4652 kHz
E4B07
(D)
If a
frequency counter with a time base accuracy of +/- 10 ppm reads 146,520,000 Hz,
what is the most the actual frequency being measured could differ from the
reading?
A. 146.52 Hz
B. 10 Hz
C. 146.52 kHz
D. 1465.20 Hz
E4B08
(D)
If a
frequency counter with a time base accuracy of +/- 1.0 ppm reads 432,100,000
Hz, what is the most the actual frequency being measured could differ from the
reading?
A. 43.21 MHz
B. 10 Hz
C. 1.0 MHz
D. 432.1 Hz
E4B09
(A)
If a
frequency counter with a time base accuracy of +/- 0.1 ppm reads 432,100,000
Hz, what is the most the actual frequency being measured could differ from the
reading?
A. 43.21 Hz
B. 0.1 MHz
C. 432.1 Hz
D. 0.2 MHz
E4B10
(C)
If a
frequency counter with a time base accuracy of +/- 10 ppm reads 432,100,000 Hz,
what is the most the actual frequency being measured could differ from the
reading?
A. 10 MHz
B. 10 Hz
C. 4321 Hz
D. 432.1 Hz
E4B11
(C)
If a
100 Hz signal is fed to the horizontal input of an oscilloscope and a 150 Hz
signal is fed to the vertical input, what type of Lissajous figure should be
displayed on the screen?
A. A looping pattern with 100 loops
horizontally and 150 loops vertically
B. A rectangular pattern 100 mm wide and 150 mm
high
C. A looping pattern with 3
loops horizontally and 2 loops vertically
D. An oval pattern 100 mm wide and 150 mm high
E4B12
(C)
What is
a dip-meter?
A. A field-strength meter
B. An SWR meter
C. A variable LC oscillator
with metered feedback current
D. A marker generator
E4B13
(D)
What
does a dip-meter do?
A. It accurately indicates signal strength
B. It measures frequency accurately
C. It measures transmitter output power
accurately
D. It gives an indication of
the resonant frequency of a circuit
E4B14
(B)
How
does a dip-meter function?
A. Reflected waves at a specific frequency
desensitize a detector coil
B. Power coupled from an
oscillator causes a decrease in metered current
C. Power from a transmitter cancels feedback
current
D. Harmonics from an oscillator cause an
increase in resonant circuit Q
E4B15
(D)
What
two ways could a dip-meter be used in an amateur station?
A. To measure resonant frequency of antenna
traps and to measure percentage of modulation
B. To measure antenna resonance and to measure
percentage of modulation
C. To measure antenna resonance and to measure
antenna impedance
D. To measure resonant
frequency of antenna traps and to measure a tuned circuit resonant frequency
E4B16
(B)
What
types of coupling occur between a dip-meter and a tuned circuit being checked?
A. Resistive and inductive
B. Inductive and capacitive
C. Resistive and capacitive
D. Strong field
E4B17
(A)
For
best accuracy, how tightly should a dip-meter be coupled with a tuned circuit
being checked?
A. As loosely as possible
B. As tightly as possible
C. First loosely, then tightly
D. With a jumper wire between the meter and the
circuit to be checked
E4B18
(A)
What
factors limit the accuracy, frequency response and stability of an
oscilloscope?
A. Accuracy and linearity of
the time base and the linearity and bandwidth of the deflection amplifiers
B. Tube face voltage increments and deflection
amplifier voltage
C. Accuracy and linearity of the time base and
tube face voltage increments
D. Deflection amplifier output impedance and
tube face frequency increments