Question 1

A voltmeter has high resistance connected ____ the meter movement.&#10;A) alternatively to&#10;B) in parallel with&#10;C) indirectly to&#10;D) in series with

Accepted Answer

A voltmeter is connected in series with the circuit to measure the potential difference across a component. This means that the meter movement (which measures the voltage) is also in series with the rest of the circuit and therefore needs to have high resistance to avoid affecting the circuit's behavior. Thus, the correct answer is in series with, which is choice D.

Question 2

The ____ is designed to be connected directly across the source of power.&#10;A) ammeter&#10;B) ohmmeter&#10;C) voltmeter&#10;D) speedometer

Accepted Answer

A voltmeter is designed to measure voltage and is connected directly across the source of power to measure the potential difference. An ammeter is connected in series with the circuit to measure the current. An ohmmeter is connected across the circuit element to measure the resistance. A speedometer measures the speed of a vehicle and is not relevant to electrical circuits.

Question 3

An advantage of the analog meter is that it is generally easier for an inexperienced person to learn to read.

Accepted Answer

False

Question 4

Most voltmeters are multiranged.

Accepted Answer

Most voltmeters have multiple range settings to measure different levels of voltage accurately.

Question 5

An ammeter has a typical impedance of less than ____.&#10;A) 0.1 ohm&#10;B) 1 ohm&#10;C) 10 ohm&#10;D) 100 ohm

Accepted Answer

Ammeters are designed to have very low impedance (typically less than 0.1 ohm) to minimize their impact on the circuit they are measuring.

Question 6

In the air- conditioning and refrigeration field, the technician works almost exclusively with direct current.

Accepted Answer

The technician typically works with alternating current (AC) in the air-conditioning and refrigeration field.

Question 7

Clamp-on types of ammeters are generally used in the field for troubleshooting.

Accepted Answer

Clamp-on ammeters are designed for easy and non-invasive current measurement, making them particularly useful for troubleshooting and maintenance in the field.

Question 8

The ohmmeter must never be connected to a circuit with power on.

Accepted Answer

If an ohmmeter is connected to a circuit with power on, there is a risk of damaging the meter or the circuit, and it could also be dangerous to the person making the connection.

Question 9

AC ____ use a current transformer to provide multiscale capability.&#10;A) ohmmeters&#10;B) ammeters&#10;C) voltmeters&#10;D) multimeters

Accepted Answer

Ammeters are used to measure current, and current transformers are commonly used to provide multiscale capability in ammeters. Ohmmeters measure resistance, voltmeters measure voltage, and multimeters are versatile instruments that can measure multiple electrical quantities, but they do not necessarily require a current transformer to provide multiscale capability.

Question 10

The ____ is used to measure resistance.&#10;A) ohmmeter&#10;B) ammeter&#10;C) voltmeter&#10;D) multimeter

Accepted Answer

An ohmmeter is specifically designed to measure resistance, while an ammeter measures the flow of current, a voltmeter measures the voltage, and a multimeter can measure a combination of electrical properties including resistance.

Deck 3: Measuring Instruments