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Exam 8: Measuring Instruments

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Question 1

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If a DC voltmeter is connected to an AC circuit with an applied voltage of 240 V, the meter will read ____ volts.

A) 120
B) 240
C) 480
D) 0

E) A) and D)
F) B) and C)

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Question 2

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An ammeter is used to measure current and must be connected in ____ with the load.

A) parallel
B) series
C) either a or b

D) A) and B)
E) None of the above

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Question 3

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The input impedance used to limit the flow of current through digital meters is accomplished by using ____.

The test instrument used to measure the resistance of an electrical circuit is called a(n) ____________________.

A(n) ____________________ is used to measure power in an electrical circuit.

Any number can be multiplied by ____________________ by moving the decimal point one place to the right, and any number can be divided by ____________________ by moving the decimal point one place to the left.

If a clamp-on ammeter is clamped around more than one power line of a 240 V circuit, the meter will read ____ volts.

When reading a digital meter, the symbol "mV" indicates ____________________.

When a toroid current transformer is used to measure AC current, the main power line acts as the ____ and is considered to be one turn.

A voltmeter is designed to be connected in ____ with the circuit to be measured.

A _________________________ is a device used to measure voltage, but does not contain a meter movement or a digital display.

Most AC ammeters use a ______________________________ to change scale values instead of shunts, which can be used to increase range but cannot be used to decrease range.

When the selector switch of a meter is turned to a new scale, steps of ____ are inserted in the circuit to increase the range or are removed from the circuit to decrease the range.

When a large amount of AC current must be measured, current transformers known as ____________________, that have a standard secondary current rating of 5 A -- AC, are used.

____________________ ohmmeters measure resistance by measuring the amount of voltage-drop across an unknown resistance.

Digital meters that do not contain a range setting control are known as ____ meters.

A(n) ____ is a low-resistance device used to conduct most of the circuit current away from the meter movement.

The ____________________ is the ratio of the number of turns of wire in the transformer primary winding to the number of turns of wire in the transformer secondary winding.

The ____ must provide its own source of power.

A(n) ____ must never be connected to a circuit when the power is turned on.