TPC 204

Question 1

Digital meters are named such because:

Answer 1

Their internal circuits carry signals consisting of 1’s and 0’s

Question 2

An ADC (ANALOG TO DIGITAL CONVERTER) is an essential part of:

Answer 2

All digital meters

Question 3

Dual slope integrators are found in certain kinds of:

Answer 3

ADC’S

Question 4

In order to generate a display, a digital meter needs a _______ processor, an ADC and a readout control.

Answer 4

Signal

Question 5

All integrating ADC’S count the time it takes to charge or discharge a capacitor to a reference:

Answer 5

Voltage

Question 6

LCD’S (Liquid crystal displays) make better meter displays than LED’s because of their:

Answer 6

Low energy requirement

Question 7

What is usually expressed as plus or minus some percentage and expresses a meters maximum and minimum expected error?

Answer 7

Accuracy

Question 8

D’Arsonval movements are used in ______ meters

Answer 8

Analog

Question 9

Ohm per volt is the measurement unit used to express a meters:

Answer 9

Sensitivity

Question 10

A parallel leg or branch added around an analog meter movement is known as a:

Answer 10

Shunt

Question 11

The purpose of a make then break switch is to:

Answer 11

Protect the meter movement from overcurrent

Question 12

You will destroy an analog ammeter if you connect it in:

Answer 12

Parallel instead of series

Question 13

To connect an ammeter to a circuit, you need to:

Answer 13

Open the circuit

Question 14

PMMC galvanometer movement for DC can be converted to measure AC with the addition of a:

Answer 14

Rectifier

Question 15

The best way to take an ammeter reading on a live circuit is with a clamp on ammeter because you don’t have to:

Answer 15

Break into the circuit

Question 16

An accurate wattmeter will always show the true power consumed, which takes into account the power losses due to:

Answer 16

The power factor

Question 17

An internal variable resistor is needed in an ohmeter to:

Answer 17

Compensate for aging batteries

Question 18

The jaws of a clamp on ammeter serve as a:

Answer 18

Transformer secondary

Question 19

Use clips on the end of voltmeter leads whenever:

Answer 19

Voltage levels are high

Question 20

Circuit resistance is measured by an:

Answer 20

Ohmeter

Question 21

The current flowing through an ohmeter is usually very small, on the order of:

Answer 21

Mircoamperes

Question 22

The main tests you are likely to perform using a megohmeter are for continuity, shorts, grounds and:

Answer 22

Insulation condition

Question 23

To test the condition of the insulation on motor windings, use a:

Answer 23

Megohmeter

Question 24

Shorted capacitors exhibit _______ resistance when tested with a megohmeter.

Answer 24

Little to no

Question 25

When you need to measure a very small resistance, use a _______ ohmeter. When you need to measure larger resistances, use a _______.

Answer 25

Shunt; series ohmeter

Question 26

Dual shunts in an ohmeter provide:

Answer 26

Dual range capabilities

Question 27

VOM stands for:

Answer 27

Volt-ohm-miliameter

Question 28

The main advantage of an analog/digital multimeter is that it can allow you to:

Answer 28

Spot trends more easily than with a DMM

Question 29

When using a multimeter to measure voltage, what should you do after turning on the device and turning the range selector to its highest voltage?

Answer 29

Check the meter on a known source

Question 30

Current and voltage readings taken on the far right of the meter scale provide greater:

Answer 30

Accuracy

Question 31

Graphical multimeters can perform functions that standard digital meters cannot, such as:

Answer 31

Displaying transients

Question 32

In the GLITCH CAPTURE MODE, the meter is set so that you can view:

Answer 32

Transient spikes

Question 33

You should use a current probe with a multimeter whenever you need to:

Answer 33

Measure high magnitude current

Question 34

Using a GMM in TREND mode, you can monitor:

Answer 34

Line voltage for sags and surges

Question 35

A chief cause of
catastrophic meter failure is usually an:

Answer 35

Unexpected voltage

Question 36

In a CAT III installation category, you would expect to find:

Answer 36

Three phase motors and adjustable speed drives

Question 37

Transducers may be attached to an oscilloscope in order to:

Answer 37

Measure different kinds of signals

Question 38

Inscribed on the screen of most oscilloscopes is grid like pattern, called a:

Answer 38

Graticule

Question 39

If an oscilloscope doesn’t have a free running sweep, it will have a:

Answer 39

Triggered sweep

Question 40

A dual trace oscilloscope is used to:

Answer 40

Display two wave forms at once

Question 41

Regardless of whether an oscilloscope is analog or digital, single or dual trace, it can still be either a real time oscilloscope or a:

Answer 41

Sampling oscilloscope

Question 42

Most oscilloscopes can also fill in the missing parts of a wave between the sample points. This is called:

Answer 42

Interpolation

Question 43

Slope and trigger controls give you control over exactly where in the waveform you want the screen display to:

Answer 43

Begin

Question 44

An attenuated probe is used to minimize the effects of:

Answer 44

Circuit loading

Question 45

Square wave signals are used in oscilloscopes to:

Answer 45

Compensate the probe

Question 46

Strong harmonics of the original voltage sine wave appear in an AC Power line caused by:

Answer 46

Non-linear loads

Question 47

All meters have one thing in common. They all have an internal ______ to which measured values are compared.

Answer 47

Standard