2-2-1 Introduction to Test Instruments

Question 1

All other units of measure are defined and compared to the four basic measurements of length, __?__.

Answer 1

weight, time, and temperature

Question 2

The Romans refined distance traveled to a unit of length called the __?__.

Answer 2

mile

Question 3

The basic subunit of the ancient Egyptians’ royal cubit stone is the span.

Answer 3

False

Question 4

The meter was defined as 1/10,000,000 of the distance of the meridian passing through __?__ from the North Pole to the Equator.

Answer 4

Paris

Question 5

Mass is used as a standard instead of weight.

Answer 5

True

Question 6

Weight is often used as a standard because it is universally constant, regardless of latitude.

Answer 6

False

Question 7

The Babylonian calendar consisted of 360 days. This led to fractions such as 1/60 which are still used in astronomy and for the minutes and seconds of the day.

Answer 7

True

Question 8

The metric system adopted the __?__ as the standard unit of time measurement.

Answer 8

second

Question 9

Both Fahrenheit and Celsius thermometers have scales based on the freezing and boiling points of __?__.

Answer 9

water

Question 10

The absolute zero scale of centigrade is often called the __?__.

Answer 10

Kelvin

Question 11

The signal word used to indicate a potentially hazardous situation which could result in death or serious injury is the __?__.

Answer 11

warning

Question 12

Always ensure that the jack position of the test leads corresponds to the setting of the meter function and selector switch before taking a measurement.

Answer 12

True

Question 13

The main reason for the increase in the use of digital electronic technology is for greater measuring capability.

Answer 13

True

Question 14

Only a meter marked __?__ can be used when taking a measurement on a circuit that includes solid-state components that distort the shape of AC sine waves.

Answer 14

True RMS

Question 15

The __?__ feature on a digital multimeter allows a meter to automatically adjust to a higher range setting if the set range is not high enough for the application.

Answer 15

Autoranging

Question 16

Digital test instruments are less susceptible to noise than analog test instruments.

Answer 16

False

Question 17

Analog test instruments are less accurate than digital test instruments.

Answer 17

True

Question 18

When using a test instrument with test leads, the __?__ lead should be connected first.

Answer 18

ground

Question 19

For maximum safety, personal protective equipment and safety requirements for test instrument procedures must be followed, as specified in __?__, which is one of several standards.

Answer 19

NFPA 70E

Question 20

The primary purpose of rubber insulating gloves is to insulate the hands and lower arms from possible contact with live conductors.

Answer 20

True

Question 21

__?__ are an eye protection device with special impact-resistant glass or plastic lenses.

Answer 21

Safety glasses

Question 22

An arc __?__ is an explosion that occurs when the air surrounding electrical equipment becomes ionized and conductive.

Answer 22

blast

Question 23

Electricity is the number one cause of fires.

Answer 23

True

Question 24

Never touch any part of an electrical shock victim’s body when it is in contact with the circuit. When the circuit cannot be turned off, use any __?__ device to free the victim.

Answer 24

nonconducting

Question 25

Grounding is the connection of all exposed, noncurrent-carrying metal parts to the neutral conductor.

Answer 25

False

Question 26

__?__ is the process of removing the source of electrical power and installing a lock that prevents the power from being turned on.

Answer 26

Lockout

Question 27

Lockout/Tagout is normally removed by the __?__, other than in an emergency.

Answer 27

person who installed it

Question 28

An arc flash is an extremely high-temperature ? produced by an electrical fault in the air.

Answer 28

discharge

Question 29

Clothing made of synthetic materials, such as rayon, are the only type that are to be worn when working with energized electrical circuits.

Answer 29

False

Question 30

The __?__ is a federal act that requires all employers to provide a safe environment for employees.

Answer 30

OSH Act

Question 31

The life expectancy of a test instrument depends on the __?__.

Answer 31

care of the meter

Question 32

Extra care must be provided to digital test instruments because their movements are susceptible to damage from shock.

Answer 32

False

Question 33

The resistance of test leads must be less than __?__.

Answer 33

1 Ohm