Deck 9: Analog and Digital Multimeters

Question 1

Any coil for a transformer, solenoid, or motor will have ______________ resistance if the winding is open.

Answer 1

infinite

Question 2

A DMM uses a ______________ display to indicate the value of the measured quantity.

Answer 2

numeric

Question 3

A D'Arsonval movement is generally used in a(n) ______________ VOM.

Answer 3

analog

Question 4

Looking at an analog meter from the side results in an optical error called ______________.

Question 5

A precision resistor connected across a meter movement for the purpose of bypassing a specific fraction of the circuit's current is called a meter ______________.

Question 6

When the insertion of a current meter reduces the circuit current below that which exists without the meter present, the effect is called meter ______________.

Question 7

Most general-purpose analog VOMs have an accuracy of about plus or minus (number only) ______________ percent.

Question 8

Voltmeter loading can be appreciable in ______________ circuits.

Question 9

The ______________ at the bottom of a DMM's display is used only to show the relative magnitude of the input compared to the full-scale value of the range in use.

Question 10

Usually the ohms-per-volt rating of a voltmeter is

A) very low
B) printed on the meter face
C) not the same for all ranges
D) 500 ohms per volt

Question 11

When the measured voltage decreases because of the additional load current for the meter, the meter is said to be

A) accurate and expensive
B) non-operational
C) loaded up
D) loaded down

Question 12

Voltmeter loading can be appreciable in

A) rectifier circuits
B) amplifier circuits
C) high-resistance circuits
D) low-resistance circuits

Question 13

The loading effect is minimized by using

A) a voltmeter with very high resistance
B) a voltmeter with a very low resistance
C) a voltmeter with zero resistance
D) an ammeter with a very high resistance

Question 14

A digital multimeter usually has an input resistance of about

A) 100 ohms
B) 1000 ohms
C) 10,000 ohms
D) 10 M?

Question 15

What type of meter consists of an internal battery, the meter movement, and a current-limiting resistance?

A) Voltmeter
B) Ammeter
C) Ohmmeter
D) Wattmeter

Question 16

When the ohmmeter leads are open, not touching each other, the ohmmeter

A) is broken
B) is being zeroed
C) indicates no resistance
D) indicates infinitely high resistance

Question 17

The ohm scale increases from right to left and is called a

A) backwards scale
B) back-off scale
C) back-up scale
D) back-to-back scale

Question 18

When the zero adjust on an ohmmeter cannot deflect the pointer all the way to zero, it generally means

A) the potentiometer is faulty
B) the ohmmeter is shot
C) the fuse is blown
D) the battery voltage is too low

Question 19

Multitester is another name for a(n)

A) ohmmeter
B) voltmeter
C) ammeter
D) multimeter

Question 20

A feature of most DMMs that selects the proper range for the meter and indicates the range as a readout is called

A) semi-selection
B) multi-function
C) autoranging
D) automatic

Question 21

Most analog multimeters have an ac voltage scale calibrated in

A) watt-seconds
B) volt-amps
C) megavolts
D) decibels

Question 22

An accessory probe that can be used with a multimeter to measure dc voltages up to 30 kV is called a(n)

A) scope probe
B) high-voltage probe
C) amplifier probe
D) grounding wand

Question 23

Digital multimeters are generally easier to use because

A) they eliminate human error that often occurs in reading scales on an analog meter
B) there are more controls
C) they are much larger
D) they have better operator's manuals

Question 24

The basis of the digital multimeter operation is a(n)

A) rectifier circuit
B) oscillator circuit
C) analog-to-digital converter circuit
D) digital-to-analog converter circuit

Question 25

A circuit that converts analog voltage values to an equivalent binary form is called the

A) rectifier circuit
B) oscillator circuit
C) analog-to-digital converter circuit
D) digital-to-analog converter circuit

Question 26

When testing a semiconductor diode with a DMM, normal values are

A) 0.7 V for silicon and 0.3 V for germanium
B) 0.3 V for silicon and 0.7 V for germanium
C) 1.2 V for silicon and 0.6 V for germanium
D) 1.7 V for silicon and 1.3 V for germanium

Question 27

What is the term for a DMM that specifies how many places can be used to display the digits 0 to 9, regardless of the decimal point?

A) Protocol
B) Accuracy
C) Revolution
D) Resolution

Question 28

What is the function of a DMM that automatically shifts it to a higher range as soon as an overload is indicated?

A) Auto shift
B) Automatic
C) Autorange
D) Auto overload

Question 29

When an ohmmeter is connected to a circuit in which power is on, the ohmmeter

A) will read a higher value
B) will read a lower value
C) will read zero
D) can be damaged

Question 30

When making a measurement, a voltmeter should always be connected in

A) parallel with the power off
B) parallel with the power on
C) series with the power off
D) series with the power on

Question 31

When testing a fuse in a circuit with power applied using a voltmeter, an open fuse will measure

A) zero volts
B) 12 V
C) 120 Vac
D) the value of the voltage source

Question 32

A wire conductor that is continuous without a break has practically ______________ ohms of resistance.

A) 0
B) 1
C) 2
D) none of these are correct

Question 33

The digital multimeter (DMM) is the most common measuring instrument used by technicians.

Question 34

Some DMMs can measure capacitors, diodes, and transistors.

Question 35

A digital multimeter uses a moving pointer and a printed scale.

Question 36

Two types of multimeters used by technicians are: analog volt-ohm-milliammeter and a digital multimeter.

Question 37

A moving-coil meter movement is generally used in a digital multimeter.

Question 38

The moving-coil arrangement is often called a Roentgen movement, after its inventor.

Question 39

When the moving pointer of a VOM hits the right-pointer stop, the meter is said to be pegged.

Question 40

Looking at a meter while directly in front of it is known as parallax.

Question 41

A meter shunt is a precision resistor connected across the meter movement for the purpose of bypassing a specific fraction of the circuit's current.

Question 42

When the insertion of a current meter increases the circuit current above that which exists without the meter present, the effect is called current meter loading.

Question 43

The current meter's resistance should be no greater than 1/100 of the circuit resistance.

Question 44

Although a meter movement responds only to current in the moving coil, it is commonly used for measuring voltage by the addition of a high resistance in series with the movement.

Question 45

Most general-purpose analog VOMs have an accuracy of ±20%.

Question 46

A voltmeter has low resistance and is generally connected in series.

Question 47

A higher ohms-per-volt rating means higher voltmeter resistance.