2-2-2 General Use Test Instruments

Question 1

A portable test instrument is used to take real time (momentary) measurements.

Answer 1

True

Question 2

A permanent test instrument is a device that is installed in a process or at a bench to continually measure and display quantities.

Answer 2

True

Question 3

AC current is current in a circuit that flows in one direction only.

Answer 3

False

Question 4

AC voltage is voltage in a circuit that reverses its direction of flow at regular intervals and is stated and measured as a peak, average, or __?__ value.

Answer 4

RMS

Question 5

The __?__ value of a sine wave is the maximum instantaneous value of either the positive or negative values in the sine wave.

Answer 5

peak

Question 6

A test light is a test instrument with a bulb that is connected to two leads to give a visual indication when __?__ is present in a circuit.

Answer 6

voltage

Question 7

Voltage indicators only indicate that voltage and current are present, but do not indicate the actual voltage.

Answer 7

False

Question 8

A voltage indicator needs to only be near a voltage source to indicate the presence of voltage.

Answer 8

True

Question 9

One advantage of voltage testers is that they have a lower impedance (resistance) and draw more current than voltage indicators, which allows them to be used for testing __?__.

Answer 9

GFCIs

Question 10

When voltage measurements are different from what is expected, the voltage measurement is most likely to be lower than normal.

Answer 10

True

Question 11

A(n) ? is a test meter that measures resistance, the opposition to the flow of electrons in a circuit.

Answer 11

Ohmmeter

Question 12

The higher the resistance in a circuit, the higher the current flow through the circuit.

Answer 12

False

Question 13

A closed switch that is operating properly has continuity.

Answer 13

True

Question 14

An ohmmeter is used to measure the __?__.

Answer 14

resistance

Question 15

When using an ohmmeter, the resistance of all components connected in parallel with the component being tested affects, and typically lowers, the resistance reading.

Answer 15

True

Question 16

A megohmeter is a high-resistance ohmmeter used to measure insulation deterioration on various wires by measuring high-resistance values during high voltage test conditions.

Answer 16

True

Question 17

__?__ leakage current is current that flows from areas on conductors where insulation has been removed to allow electrical connections.

Answer 17

Surface

Question 18

Current is measured in ?.

Answer 18

Amperes

Question 19

A clamp-on ammeter is a test instrument that measures current in a circuit by measuring the strength of the __?__ around a single conductor.

Answer 19

magnetic field

Question 20

In-line ammeters require the circuit to be __?__ so the ammeter can be inserted into the circuit to acquire a reading.

Answer 20

opened

Question 21

A clamp-on ammeter is typically used to measure current in a circuit with over one amp of current.

Answer 21

True

Question 22

Measuring current is useful because only current can be used to determine how much a circuit is loaded (working).

Answer 22

True

Question 23

Many test instruments include a(n) __?__ in the current-measuring circuit to prevent damage caused by excessive current.

Answer 23

fuse

Question 24

One problem with small three-phase voltage imbalances is that they cause high ? imbalances.

Answer 24

current

Question 25

When a three-phase current unbalance exceeds __?__, a test for voltage unbalance should be performed.

Answer 25

10%

Question 26

Most analog multimeters do not have calibrated scales that correspond to the different selector switch settings.

Answer 26

False

Question 27

Most digital multimeter displays include a(n) __?__ to show changes and trends in a circuit.

Answer 27

bar graph

Question 28

Voltage measurements using the __?__ on a digital multimeter are useful in identifying low voltage conditions.

Answer 28

MIN MAX mode