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Reviewer > L3 > Flashcards

L3 Flashcards

1
Q

including multi-meter’s current ranges have a certain resistance with particular
current and voltage requirement at full scale detection.

A

Ammeter

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2
Q

Multi-Meters inherently measure voltage, and pass a current to be measured through a shunt resistance, measuring the voltage developed across it.

A

Ammeter

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3
Q

The voltage drop is known as the “_____ _____,” specified in volts per ampere.

A

Burden voltage

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4
Q

It is an error/effect when the ammeter is inserted in the circuit of interest.

A

Burden voltage

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5
Q

can be significant in very low-voltage and low current circuit areas.

A

Burden voltage

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6
Q

Analog or deflection types are un-buffered, and draw current from the circuit
under test to deflect the meter pointer.

A

Voltmeter

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7
Q

The impedance of the meter varies depending on the basic sensitivity of the meter movement and the range which is selected.

A

Voltmeter

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8
Q

may not change in different ranges but this becomes significant when lower current range is selected.

A

Voltage drop

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9
Q

becomes additional load to the circuit being measured.

A

Voltmeter

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10
Q

The history of the basic meter movement used in direct current measurement can be trace back to

A

Hans Oersted’s discovery in 1820

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11
Q

What did Hans Oersted discovered in 1820

A

The relationship of Current and magnestism

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12
Q

Who discovered the relationship between current and magnetism

A

Hans Oersted

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13
Q

When did the relationship between current and magnetism discovered

A

1820

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14
Q

How many years did various types of devises that made used of the Oersted’s discovery were developed?

A

The next half of a century

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15
Q

one of the instruments for measuring electrical current par excellence.

A

Galvonometer

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16
Q

This device is used on electrical circuits to know and measure the intensity and direction of electrical current.

A

Galvonometer

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17
Q

Who discovered galvonometer

A

Luigi Galvani

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18
Q

When did Jacques D’Arsonval patented a moving coil galvanometer?

A

1881

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19
Q

What did Jacques D’Arsonval do in 1881

A

patented a moving coil galvanometer

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20
Q

Who patented a moving coil galvonometer in 1881?

A

Jacques D’Arsonval

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21
Q

is generally used for direct current measurement application.

A

D’Arsonval Meter Movement

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22
Q

What are other meter movement developed ?

A

Electrodynamometer movement and the Iron Vane meter movement.

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23
Q

What is the general application of iron vane meter movement and electrodynamometer

A

Alternating current measurement
AC measurement

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24
Q

Its general application is to measure ac.

A

Iron vane meter movement & electrodynamometer

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25
Q

The basic moving coil system is known as

A

D’Arsonval meter movement/ PMMC-Permanent Magnet Moving Coil Meter Movement

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26
Q

is generally set in a jewel and pivot suspension system to reduce friction.

A

Moving coil mechanism

27
Q

Another method that provides a more sensitive but more expensive meter movement

A

Taut Band suspension system

28
Q

a typical full scale current for a Jewel and Pivot suspension system is

A

5 micro A

29
Q

a full scale current for Taut Band suspension system is ?
entirely practical

A

2 micro A

30
Q

The typical commercial D’Arsonval Meter Movement operates on the principle of

A

DC motor

31
Q

is a current responding device.

A

D’Arsonval meter movement

32
Q

Current through coil causes it to behave as an _________ with its north and south poles.

A

Electromagnet

33
Q

is the most fundamental meter movement used today

A

Electrodynamometer movement

34
Q

is a current sensitive devise.

A

D’Arsonval meter movement & Electrodynamometer

35
Q

That is the pointer deflects ______ because of the current flow through the moving coil.

A

Upscale

36
Q

may be used to measure direct current or alternating current or voltage or single phase power in wattmeter.

A

Single coil meter movement

37
Q

may be used in Polly-phase wattmeter and the crossed coil meter movement may be used as power factor meter or as frequency meter.

A

Double coil meter movement

38
Q

electrodynamometer movement’s most important applications are as

A

volt meter and ammeter standard and transfer instrument.

39
Q

Because of the inherent accuracy it is used as standard instrument for the calibration of other instruments.

A

Electrodynamometer

40
Q

is applied to an instrument that may be calibrated with DC source then used without modification to measure AC.

A

Transfer instrument

41
Q

This gave us direct means of equating AC and DC measurement of voltage and current with frequency limit of

A

0 - 125 Hz

42
Q

consist of a fixed coil divided into two equal halves separated by a movable coil

A

single coil Electro dynamometer Movement

43
Q

is capable of handling much more current than a D’Arsonval Meter Movement could handle without a shunt.

A

Electrodynamometer movement

44
Q

the most extensive application of the electrodynamometer movement is in

A

Wattmeter

45
Q

may be used for AC and DC power

A

Wattmeter

46
Q

is consisting of a fixed coil of many turns and two iron vanes placed inside the fixed coil.

A

Iron Vane Meter Movement

47
Q

It is widely used in industry for application in which ruggedness is more important than a high degree of accuracy.

A

Iron vane meter movement

48
Q

The same square law meter scale used in

A

Electrodynamometer Movement is used in Iron Vane Meter Movement.

49
Q

The moving vane instruments are rarely used for measuring direct current except for very inexpensive indicators such as charge and discharge indicators on automobiles.

A

Iron vane meter movement

50
Q

are used extensively in industry for measuring alternating current, when 5% to 10% error is acceptable

A

Iron vane meter movement

51
Q

It can be used for current and voltage measurements but it is very sensitive to frequency change.

A

Iron vane meter movement

52
Q

This meter movement is sensitive to frequency primarily because magnetization of the iron vane is nonlinear and because of losses incurred by eddy current and hysteresis.

A

Iron vane meter movement

53
Q

can change depending on the current range selected, since different ranges usually use different values of shunt resistance.

A

Percent of error/effect

54
Q

To check for its effect on accuracy and on external circuit operation the meter can be switched to different ranges; the current reading should be the same and circuit operation should not be affected if

A

Burden voltage is not a problem

55
Q

If this voltage is significant it can be reduced (also reducing the inherent accuracy and precision of the measurement) by

A

Using higher current ranges

56
Q

To measure voltage, connect the voltmeter in parallel with the

A

Load and source of interest

57
Q

( volt meter )This voltage drop is known as

A

Loading error/ effect

58
Q

The moving coil mechanism is generally set in a

A

Jewel and pivot suspension system

59
Q

is a horseshoe shaped permanent magnet with soft iron pole pieces attached to its north and south poles.

A

D’Arsonval meter movement

60
Q

Because of the inherent accuracy it is used as standard instrument for the calibration of other instruments.

A

Electrodynamometer

61
Q

Current from the circuit being measured passes through all the coils causing a _______ around the fixed coil.

A

Magnetic field

62
Q

Since it has higher current handling capabilities due to its design it became less sensitive

A

Electrodynamometer

63
Q

The electrodynamometer sensitivity is approximately about

A

20 to 100/V.

64
Q

The electrodynamometer sensitivity is approximately about

A

20 to 100/V.

Reviewer (6 decks)

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