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Chapter 8
1 To extend the current range of a meter movement, a factor which
must be known beforehand is the:
a.* Full scale deflection voltage and coil internal resistance.
b. Maximum current-carrying capabilities of the meter movement.
c. Insulation resistance of the meter coil.
d. Maximum voltage the coil will take across its terminals.
2 To use the movement of a 0-50 microampere meter to measure
voltage in the range 0 - 10 000V, when the scale has been
calibrated to read 0 - 100 v, use would be made of a:
a.* Series resistor of approximately 200 megohms.
b. Series resistor of approximately 200 000 ohms.
c. Shunt resistor of approximately 200 megohms
d. Shunt resistor of approximately 200 000 ohms.
3 The principal reason for using a transistorized multimeter is
its greater sensivity. On a voltage scale, this means that:
a. It will load the circuit under test to a greater extent.
b.* The circuit under test sees a much higher input impedance.
c. Greater sensivity allows the scale to be subdivided into
smaller units.
d. The circuit under test will see a lower input impedance.
4 The basic instrument for measuring voltage and current is:
a. An oscilloscope.
b.* A moving coil meter.
c. A field strength meter.
d. A tape measure.
5 What is a multimeter?
a.* An instrument capable of reading voltage, current, and
resistance.
b. An instrument capable of reading SWR and power.
c. An instrument capable of reading resistance, capacitance, and
inductance.
d. An instrument capable of reading resistance and reactance.
6 How is a voltmeter typically connected to a circuit?
a. In series with the circuit.
b.* In parallel with the circuit.
c. In quadrature with the circuit.
d. In phase with the circuit.
7 How can the range of an ammeter be extended?
a. By adding resistance in series with the circuit under test.
b. By adding resistance in parallel with the circuit under test.
c. By adding resistance in series with the meter.
d.* By adding resistance in parallel with the meter.
8 What is a dummy load?
a. An isotropic radiator.
b.* A non-radiating load for a transmitter.
c. An antenna used as a reference for gain measurements.
d. The image of an antenna, located below ground.
9 What material may a dummy load, suitable for RF, be made of?
a. A wire-wound resistor.
b.* A non-inductive resistor.
c. A diode and resistor combination.
d. A coil and capacitor combination.
10 What station accessory is used in place of an antenna during
transmitter tests when no signal radiation is desired?
a. A Transmatch.
b.* A dummy load.
c. A low-pass filter.
d. A decoupling resistor.
11 What is the purpose of a dummy load?
a.* To allow off-the-air transmitter testing.
b. To reduce output power for QRP operation.
c. To give comparative signal reports.
d. To allow Transmatch tuning without causing interference.
12 What is a marker generator?
a.* A high-stability oscillator that generates a signal or series
of signals from a single low-frequency signal source.
b. A low-stability oscillator that "sweeps" through a band of
frequencies.
c. An oscillator often used in an aircraft to determine the
craft's location relative to the inner and outer markers at
airports.
d. A low-stability oscillator used for signal reception.
13 A dip oscillator is a type of:
a.* RF signal generator.
b. Cathode ray oscilloscope.
c. Reflectometer.
d. RF wattmeter.
14 Which piece of test equipment contains horizontal and vertical
channel amplifiers?
a. The ohmmeter.
b. The signal generator.
c. The ammeter.
d.* The oscilloscope.
15 What is the best instrument for checking transmitted signal
quality from a telegraphy/single-sideband transmitter?
a.* A monitor oscilloscope.
b. A field strength meter.
c. A side tone monitor.
d. A diode probe and an audio amplifier.
16 When connecting a cathode ray oscilloscope to view the wave
envelope pattern of an amplitude modulated transmitter, the
following coupling method would be used:
a. Direct coupling.
b. Inductive coupling.
c. Driver input coupling.
d.* Inductively coupled to the final tuned circuit.
17 The vertical deflection plates in a cathode ray oscilloscope
may be used to measure the amplitude of a signal. This signal
displayed on the screen and measurements taken, may be calibrated
and stated in terms of:
a. Current.
b.* Voltage.
c. Frequency.
d. Time.
18 What kind of input signal is used to test the
Peak-envelope-power of an SSB transmitter while viewing the output
with an oscilloscope?
a. Normal speech.
b. An audio frequency sine wave.
c.* Two audio frequency sine waves.
d. An audio frequency square wave.
19 What can be determined by making a "two-tone-test" using an
oscilloscope?
a. The percent of frequency modulation.
b. The percent of carrier phase shift.
c. The frequency deviation.
d.* The amplifier PEP power output.
20 When viewing an amplitude modulated transmitter's RF envelope
on an oscilloscope, what affects the envelope's shape during
modulation?
a. The frequency swings of the carrier.
b.* The shape of the modulating waveform.
c. The bias class of the power amplifier circuit.
d. The keying rise time.
21 What is a reflectometer used for?
a.* Checking the standing-wave ratio.
b. Peaking a receiver's sensitivity.
c. Transmitter noise figure measurements.
d. Measuring sunlight intensity.
22 Where in the antenna transmission line should a peak-reading
wattmeter be attached to determine the transmitter power output?
a.* At the transmitter output.
b. At the antenna feed point.
c. One-half wavelength from the antenna feed point.
d. One-quarter wavelength from the transmitter output.
23 What is a field-strength meter?
a. A device for determining the standing-wave ratio on a
transmission line.
b. A device for checking modulation on the output of a
transmitter.
c.* A device for checking antenna patterns.
d. A device for increasing the average transmitter output. |
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