New Zealand NZART pool, section ZLB13

Subelement ZLB

Basic Electrical Theory

Section ZLB13

Meters and Measuring

ZLB1301

An ohmmeter measures the

Correct Answer
A.
value of any resistance placed between its terminals
B.
impedance of any component placed between its terminals
C.
power factor of any inductor or capacitor placed between its terminals
D.
voltage across any resistance placed between its terminals

ZLB1301

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ZLB1302

A VSWR meter switched to the "reverse" position provides an indication of

A.
power output in watts
Correct Answer
B.
relative reflected voltage
C.
relative forward voltage
D.
reflected power in dB

ZLB1302

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ZLB1303

The correct instrument for measuring the supply current to an amplifier is a

A.
wattmeter
B.
voltmeter
Correct Answer
C.
ammeter
D.
ohmmeter

ZLB1303

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ZLB1304

The following meter could be used to measure the power supply current drawn by a small hand-held transistorised receiver

A.
a power meter
B.
an RF ammeter
Correct Answer
C.
a DC ammeter
D.
an electrostatic voltmeter

ZLB1304

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ZLB1305

When measuring the current drawn by a light bulb from a DC supply, the meter will act in circuit as

A.
an insulator
Correct Answer
B.
a low value resistance
C.
a perfect conductor
D.
an extra current drain

ZLB1305

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ZLB1306

When measuring the current drawn by a receiver from a power supply, the current meter should be placed

A.
in parallel with both receiver power supply leads
B.
in parallel with one of the receiver power leads
C.
in series with both receiver power leads
Correct Answer
D.
in series with one of the receiver power leads

ZLB1306

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ZLB1307

An ammeter should not be connected directly across the terminals of a 12 volt car battery because

Correct Answer
A.
the resulting high current will probably destroy the ammeter
B.
no current will flow because no other components are in the circuit
C.
the battery voltage will be too low for a measurable current to flow
D.
the battery voltage will be too high for a measurable current to flow

ZLB1307

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ZLB1308

A good ammeter should have

A.
a very high internal resistance
B.
a resistance equal to that of all other components in the circuit
Correct Answer
C.
a very low internal resistance
D.
an infinite resistance

ZLB1308

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ZLB1309

A good voltmeter should have

Correct Answer
A.
a very high internal resistance
B.
a resistance equal to that of all other components in the circuit
C.
a very low internal resistance
D.
an inductive reactance

ZLB1309

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ZLB1310

An rms-reading voltmeter is used to measure a 50 Hz sinewave of known peak voltage 14 volt. The meter reading will be about

A.
14 volt
B.
28 volt
Correct Answer
C.
10 volt
D.
50 volt

ZLB1310

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