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148 lines
2.5 KiB
Plaintext
148 lines
2.5 KiB
Plaintext
% FILENAME = N13.TXT
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% Meters and Measuring
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% Release version 2, January 2000
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%Question: 1
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#13.1 An ohmmeter measures the:
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value 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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% ans 1
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%Question: 2
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#13.2 A VSWR meter switched to the "reverse" position provides an indication
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of:
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power output in watts
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relative reflected voltage
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relative forward voltage
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reflected power in dB
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% ans 2
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%Question: 2
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#13.3 The correct instrument for measuring the supply current to an amplifier
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is a:
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wattmeter
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voltmeter
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ammeter
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ohmmeter
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% ans 3
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%Question: 4
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#13.4 The following meter could be used to measure the power supply current
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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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a DC ammeter
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an electrostatic voltmeter
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% ans 3
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%Question: 5
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#13.5 When measuring the current drawn by a light bulb from a DC supply, the
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meter will act in circuit as:
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an insulator
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a low value resistance
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a perfect conductor
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an extra current drain
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% ans 2
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%Question: 6
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#13.6 When measuring the current drawn by a receiver from a power supply, the
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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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in series with one of the receiver power leads
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% ans 4
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%Question: 7
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#13.7 An ammeter should not be connected directly across the terminals of a 12
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volt car battery because:
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the 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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% ans 1
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%Question: 8
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#13.8 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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a very low internal resistance
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an infinite resistance
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% ans 3
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%Question: 9
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#13.9 A good voltmeter 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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a very low internal resistance
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an inductive reactance
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% ans 1
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%Question: 10
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#13.10 An rms-reading voltmeter is used to measure a 50 Hz sinewave of known
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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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10 volt
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50 volt
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% ans 3
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