Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ECE132 - Instrumentation and Control > LE1 > Flashcards

LE1 Flashcards

1
Q

D’Arsonval meter movement is also called as …

A

PMMC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the accuracy of D’Arsonval meter?

A

2%-5%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the types of analog meter?

A

Plunger Style moving vane, Radial vane, Concentric vane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

It is the human error of reading the analog meter from an angle.

A

Parallax Effect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What do you call the resistor that is added to vary the range of the ammeter?

A

Shunt resistor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What do you call the resistor that is added to vary the range of the voltmeter?

A

Multiplier resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

When a voltmeter is in parallel with the circuit component being measured, the total resistance of the circuit _______ and the voltage across the component also ______. This error is called the ______.

A

decreases ; decreases; voltmeter loading error

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

When the ammeter is inserted in series in the circuit, the total resistance of the circuit _______ and the current in the circuit ______. This error is called the ______.

A

increases ; decreases ; ammeter insertion error

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Enumerate different Wheatstone bridge types.

A

Maxwell, Hay, Schering, Wien

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

He never claimed to be the inventor of the bridge circuit. However, he invented many uses for it.

A

Sir Charles Wheatstone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

It is an electrical device used to measure the CHANGE in its resistance

A

Wheatstone bridge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The Wheatstone bridge gets more sensitive when it is supplied with lower voltages. True or False?

A

False. The Wheatstone bridge gets more sensitive when it is supplied with HIGHER voltages.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Null detector for AC bridge can be made using headphones. True or False?

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

When the null detector for AC bridge is balanced, what do you hear in the headphones? What if the AC bridge is unbalanced?

A

nothing ; clicking sounds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Hay bridge is an AC bridge that is used to determine unkown _____.

A

inductance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Maxwell bridge is an AC bridge that is used to determine unkown _____.

A

inductance and resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Schering bridge is an AC bridge that is used to determine unkown _____.

A

capacitance and resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Wien bridge is an AC bridge that is used to determine unkown _____.

A

capacitance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are the 3 functions of instruments and measurement systems?

A

indicating, recording, and controlling function

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What are the 3 applications of measurement systems?

A

monitoring, and control of process and operation, and experimental engineering analysis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What are the elements of a generalized measuring system?

A

primary sensing element, secondary sensing element, data presentation element

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

State the 5 stages in elements of a generalized measuring system.

A

primary sensing element - variable conversion element - variable manipulation element - data transmission element - data presentation element

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What can be found in the primary sensing element?

A

transducers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

To measure AC in EDM, a _____ is used to produce unidirectional torque.

A

rectifier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

It is the production of voltage across a conductor when it is exposed to a varying magnetic field

A

Electromagnetic induction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

When one circuit induces current flow in a second nearby circuit, it is known as _____.

A

Mutual inductance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

The _______ is ideal for measuring the large magnetic fields associated with AlNiCo magnets, coils and beta spectrometers.

A

Tesla meter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

A magnetometer for the measurement of the magnetic induction B or magnetic field intensity.

A

Tesla meter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

The unit of magnetic induction in the International System of Units.

A

Tesla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

A region around a magnetic material or a moving electric charge within which the force of magnetism acts.

A

magnetic field

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

A measure of the quantity of magnetism, being the total number of magnetic lines of force passing through a specified area in a magnetic field.

A

magnetic flux

32
Q

Unit of magnetic flux

A

Weber

33
Q

The amount of flux per unit area of the field, which is perpendicular to the direction of flux

A

Flux density

34
Q

Unit of flux density

A

Tesla

35
Q

The most common teslameters are based on the _____ principle and consist of an _______ and an ___________.

A

induction , inductance coil, electrical measuring instrument.

36
Q

When a change occurs in the magnetic flux linkage between the inductance coil and the magnetic field whose induction is to be determined, an _________ , which is measured by the instrument, is generated in the coil.

A

electromotive force

37
Q

In constant magnetic fields the flux linkage changes as a result of ______, ______, or _______ of the inductance coil

A

linear displacement, rotation, vibration

38
Q

In ______ magnetic fields, the change in flux linkage results from a change in the magnitude and direction of the field.

A

variable

39
Q

_______ are used as the measuring instruments in the case of constant fields

A

Fluxmeters

40
Q

Voltmeters, oscillographs, and other such devices are used in the case of _____ fields.

A

variable

41
Q

Give the Tesla meter applications

A
  • Assessment of magnetic materials.
  • Analysis of magnetic circuits and components •Measurement of residual magnetism
  • Measure stray and leakage fields
  • Measurement of absolute, and •differential fields
  • Testing, sorting, classifying magnets
  • DC and AC motor testing
  • Relay and solenoid test
  • Loudspeaker test ranges.
42
Q

The ______, is the cgs unit of measurement of a magnetic field B, which is also known as the “magnetic flux density” or the “magnetic induction”.

A

Gauss

43
Q

One gauss is defined as one _______

A

maxwell per square centimeter.

44
Q

One gauss equals ______ Tesla

A

1×10−4

45
Q

The gauss is the unit of magnetic flux density B, while the ___________ is the unit of magnetizing field H.

A

oersted

46
Q

One tesla is equal to _______gauss

A

1x10^4

47
Q

The unit of electric field in the MKS system of units is _________

A

newtons per coulomb (N/C)

48
Q

The magnetic field (in teslas) can be written as ________

A

N/(C·m/s)

49
Q

Whether a static electromagnetic field is seen as purely magnetic, or purely electric, or some combination of these, is dependent upon one’s ____________ (that is: one’s velocity relative to the field).

A

reference frame

50
Q

In ferromagnets, the movement creating the magnetic field is the ____________

A

electron spin

51
Q

In a current-carrying wire the movement is due to ____________ moving through the wire

A

electrons

52
Q

TRUE OR FALSE: The direction of the magnetic field B at any point is the same as the direction indicated by this compass.

A

TRUE

53
Q

TRUE OR FALSE: Field B is strong where lines are dense and weak where lines are sparse.

A

TRUE

54
Q

TRUE OR FALSE: Flux lines are in the direction of force

A

FALSE (flux is perpendicular to the direction of force)

55
Q

A greater magnetic force F will cause an _______(increase or decrease) in velocity v, an_______(increase or decrease) in charge q, and a _______ (smaller or larger) magnetic field B.

A

increase, increase, larger *F is directly proportional to q, V, and B*

56
Q

With a flat right hand, point thumb in direction of ________ , fingers in direction of ________. The flat hand pushes in the direction of _____

A

velocity, magnetic field, force

57
Q

TRUE OR FALSE: The force is greatest when the velocity v is perpendicular to the B field.

A

TRUE

58
Q

TRUE OR FALSE: The deflection decreases to zero for parallel motion.

A

TRUE

59
Q

A magnetic field intensity of one tesla (T) exists in a region of space where a charge of ________ moving at ____ m/s perpendicular to the B-field will experience a force of _____ newton (N).

A

one Coulumb, one, one

60
Q

Forces on negative charges are opposite to those on positive charges. The force on the negative charge requires a __________ rule to show downward force F.

A

left-hand

61
Q

The direction of forces on a charge moving in an electric field can be determined by the right-hand rule for __________ charges and by the left-hand rule for ________ charges.

A

positive, negative

62
Q

A change in flux of ______ weber per second will induce an electromotive force of _______ volt.

A

one ,one

63
Q

The ______ may be defined in terms of Faraday’s law, which relates a changing magnetic flux through a loop to the electric field around the loop.

A

weber

64
Q

1 Weber = ____ Maxwell

A

10^8

65
Q

The magnetic interaction is described in terms of a _______.

A

vector field

66
Q

The ________ is the net number of field lines passing through that surface.

A

magnetic flux

67
Q

___________ law states that a moving charge q, when acted upon by a magnetic induction field →B, will experience a force → F that is at right angles to the field vector and the velocity vector v of the charge.

A

Lorentz’ force law

68
Q

True or FALSE The Hall effect device consists of a flat, thin rectangular conductor or semiconductor with two pairs of electrodes at right angles to one another

A

TRUE

69
Q

Hall-effect gauss meters are most effective for measuring flux densities ranging from ________ μT to _______ T .

A

50 μT to 30 T.

70
Q

A ________ is an electronic device that provides a digital readout of the magnetic field strength in gauss or tesla units

A

Hall-effect meter

71
Q

Hall effect gauss meter’s probes are available with either ______ or __________ sensing elements.

A

tangential/transverse, axial

72
Q

Determine the type of bridge circuit shown

A

Hay bridge

73
Q

Determine the type of bridge circuit shown

A

Maxwell bridge

74
Q

Determine the type of bridge circuit shown

A

Schering bridge

75
Q

Determine the type of bridge circuit shown

A

Wein bridge

76
Q

Label the parts of the induction type watt-hour meter

A

ECE132 - Instrumentation and Control (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions