Subelement ZLB
Basic Electrical Theory
Section ZLB13
Meters and Measuring
An ohmmeter measures the
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Correct Answervalue of any resistance placed between its terminals
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impedance of any component placed between its terminals
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power factor of any inductor or capacitor placed between its terminals
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voltage across any resistance placed between its terminals
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A VSWR meter switched to the "reverse" position provides an indication of
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power output in watts
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Correct Answerrelative reflected voltage
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relative forward voltage
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reflected power in dB
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The correct instrument for measuring the supply current to an amplifier is a
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wattmeter
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voltmeter
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Correct Answerammeter
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ohmmeter
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The following meter could be used to measure the power supply current drawn by a small hand-held transistorised receiver
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a power meter
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an RF ammeter
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Correct Answera DC ammeter
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an electrostatic voltmeter
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When measuring the current drawn by a light bulb from a DC supply, the meter will act in circuit as
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an insulator
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Correct Answera low value resistance
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a perfect conductor
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an extra current drain
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When measuring the current drawn by a receiver from a power supply, the current meter should be placed
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in parallel with both receiver power supply leads
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in parallel with one of the receiver power leads
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in series with both receiver power leads
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Correct Answerin series with one of the receiver power leads
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An ammeter should not be connected directly across the terminals of a 12 volt car battery because
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Correct Answerthe resulting high current will probably destroy the ammeter
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no current will flow because no other components are in the circuit
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the battery voltage will be too low for a measurable current to flow
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the battery voltage will be too high for a measurable current to flow
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A good ammeter should have
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a very high internal resistance
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a resistance equal to that of all other components in the circuit
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Correct Answera very low internal resistance
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an infinite resistance
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A good voltmeter should have
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Correct Answera very high internal resistance
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a resistance equal to that of all other components in the circuit
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a very low internal resistance
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an inductive reactance
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An rms-reading voltmeter is used to measure a 50 Hz sinewave of known peak voltage 14 volt. The meter reading will be about
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14 volt
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28 volt
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Correct Answer10 volt
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50 volt
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