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objectives Flashcards

1
Q

the magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. this is known as

A

faraday’s second law of electromagnetic induction

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2
Q

whenever the flux linking a coil or current changes, an emf is induced in it. this is known as

A

faraday’s first law of electromagnetic induction

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3
Q

the force of attraction or repulsion between two magnetic poles is directly proportional to their strength

A

coulomb’s first law

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4
Q

the force of attraction or repulsion between two poles is inversely proportional to the square of the distance between them. this is known as

A

coulombs second law

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5
Q

whenever a conductor cuts magnetic flux, an emf is induced in it. this is known as

A

faraday’s law

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6
Q

a law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction

A

lenz law

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7
Q

a law that states that the current in a thermionic diode varies directly with the three-halves power of anode voltage and inversely with the square of the distance between the electrodes provided operating conditions are such thtat the current is limited only by the space charge

A

child’s law

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8
Q

States that the ratio of the thermal conductivity to the electric conductivity is proportional to the absolute temperature for all metals

A

widemann-franz law

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9
Q

a law establishing the fact that the algebraic sum of the rises and drops off the mmf around a closed loop of a magnetic circuit is equal to zero

A

Ampere Circuital Law

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10
Q

the net electric charge in an isolated system remains constant

A

law of conservation of charge

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11
Q

lenz’s law is the consequence o the law of conservation of

A

energy

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12
Q

a substance that attracts pieces of iron

A

magnet

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13
Q

the phenomenon by which a substance attracts pieces of iron

A

magnetism

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14
Q

the point in a magnet where the intensity of magnetic lines of force is maximum

A

magnetic pole

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15
Q

the straight line passing through the two poles of a magnet is called

A

magnetic axis

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16
Q

the branch of engineering which deals with the magnetic effect of electric current is known as

A

electromagnetism

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17
Q

the space outside the magnet where its poles have a force of attraction or repulsion on a magnetic pole is called

A

magnetic field

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18
Q

the total number of magnetic lines of fore in a magnetic field is also called

A

magnetic flux

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19
Q

the phenomenon by which a magnetic substance becomes a magnet when it is placed near a magnet

A

magnetic induction

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20
Q

which of the following magnetic materials can be easily magnetized in both direction

A

soft magnetic materials

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21
Q

which of the following materials has permeability slightly less than that of free space

A

diamagnetic

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22
Q

materials whose permeabilities are slightly greater than that of free space

A

paramagnetic

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23
Q

materials that have very high permeabilities (hundreds and even thousands times that of free space

A

ferromagnetic

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24
Q

the current of the electric circuit is analogous to which quantity of magnetic circuit

A

flux

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25
Q

what is the diameter of an atom

A

about 10^-10 m

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26
Q

defined as a closed path in which magnetic induction or flux flows

A

magnetic circuit

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27
Q

the force which sets up or tens to set up magnetic flux in a magnetic circuit

A

magnetomotive force

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28
Q

the property of a material which opposes the creation of magnetic flux in it

A

reluctance

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29
Q

it its the reciprocal of reluctance and implies the case of readiness which magnetic flux is developed

A

permeance

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30
Q

the ability of a material to conduct magnetic flux through it

A

permeability

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31
Q

the ratio of the permeability of material to the permeability of air or vacuum

A

relative permeability

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32
Q

permeance is analogous to

A

conductance

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33
Q

the property of the magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as

A

retentivity

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34
Q

which of the following has the least number of valence electrons

A

conductor

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35
Q

a good conductor has how many valence electrons

A

1

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36
Q

which element has four valence electrons

A

semiconductor

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37
Q

hysteresis refers to the ____ between flux density of the material and the magnetizing force applied

A

lagging effect

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38
Q

hydrogen is an example of

A

diamagnetic

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39
Q

cobalt is an example of

A

ferromagnetic

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40
Q

the evaporation of electrons from a heated surface is called

A

thermionic emission

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41
Q

electron is greek word for

A

amber

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42
Q

gases whose particles are charged are known as

A

plasma

43
Q

what are the current carriers in a conductor

A

valence electron

44
Q

When a battery is charge n an overvoltage supply, this may result to?

A

sulphation

45
Q

True or false: When a number of stages are connected in parallel, the overall gain is the product of the individual stage gains

A

false

46
Q

True of False: A number of op-amp stages can be used to provide separate gains

A

true

47
Q

A type of FET having no physical channel between source and drain

A

DE-MOSFET

48
Q

What is the process by which AC is converted to pulsating DC

A

rectification

49
Q

The arrow in any FET symbol represents the type of material used by?

A

Substrate

50
Q

What is majority carrier when a PNP CE transistor configuration is in operation?

A

hole

51
Q

It is a circuit quantity defines as the amount of charge per unit time?

A

Current

52
Q

When a battery is charge in over volatge supply, this may result to?

A

short

53
Q

What is the unit of angular velocity (w)?

A

rad/s

54
Q

A circuit component that opposes to the flow of changing current?

A

inductor

55
Q

A hybrid parameter (H-parameter) equivalent to β?

A

hfe

56
Q

A network that employs a diode to remove away a portion of the input signal
without distorting the remaining signal waveform?

A

clipper

57
Q

What is the unit of the reactive power in AC circuits?

A

VAR

58
Q

The ratio of the circumference of any circle to the diameter of the circle is:

A

AN IRRATIONAL NUMBER

59
Q

If the discriminant of a quadratic equation is greater than zero, the roots of the
equation are

A

real and distinct

60
Q

At the maximum point, the second derivative of the curve is

A

Negative

61
Q

A non-terminating and non-periodic decimal is

A

IRRATIONAL

62
Q

A condition where the transistor is operating at the upper end of the load line with a
base current that is one-tenth of the collector current.

A

hard saturation

63
Q

Which capacitance dominates in the forward-bias region?

A

diffusion

64
Q

It occurs when a conduction-band electron loses energy and falls back into a hole in
the valence band.

A

RECOMBINATION

65
Q

It is an extremely small amount of current that exists in a reverse biased diode.

A

reverse saturation current

66
Q

What unit is used to represent the level of a diode forward current?

A

mA

67
Q

The _____ diode model is employed most frequently in the analysis of electronic
systems.

A

PRACTICAL

68
Q

Across which of the following components of a power supply does the average (dc)
voltage exist?

A

center tap

69
Q

What is the typical value of the current gain of a common-base configuration?

A

<1

70
Q

Which capacitance dominates in the reverse-bias region?

A

DEPLETION

71
Q

The ________ is the minimum energy required to dislodge an electron from its
covalent bond.

A

BAND GAP ENERGY

72
Q

What is the purpose of an additional RC section in a power supply circuit?

A

decrease ac voltage component

73
Q

It is define as a large initial current that flows through the diode of a rectifier.

A

surge current

74
Q

What is the unit of the parameter hob of a BJT?

A

Ohm

75
Q

The ________ of the bipolar transistor consists of an exponential voltage-dependent
current source tied between the collector and emitter, and a diode (accounting for
the base current) tied between the base and emitter.

A

Linear approximation model

76
Q

Charge carriers move in semiconductors via two mechanisms: ________ and
________.

A

drift, diffusion

77
Q

In a simple series regulator circuit, which of the following components is the
controlling element?

A

Transistor

78
Q

The current gain of a Darlington pair is called ________.

A

Super beta

79
Q

The time required for the minority carriers to return to the majority carrier state in
the opposite material.

A

storage time

80
Q

In which of the following applications is a pulsating dc voltage suitable?

A

Battery charger

81
Q

What does a high resistance reading in both forward- and reverse-bias directions
indicate?

A

Open diode

82
Q

For proper operation, the ________ is forward biased and the ________ is reversebiased

A

BE and BC junction

83
Q

A phenomenon that occurs for large reverse voltages across a pn junction where the
free
electrons are accelerated to such high speeds that they can dislodge valence
electrons.

A

Avalanche Effect

84
Q

At what region of operation is the base-emitter junction forward biased and the base collector junction reverse biased?

A

LINEAR

85
Q

What is the typical energy gap of silicon semiconductor?

A

1.1 eV

86
Q

How many terminals can a MOSFET have?

A

2

87
Q

Which of the following semiconductor material is sensitive to temperature change?

A

Ge

88
Q

The ___________ provides a voltage gain less than unity, a high input impedance,
and a low output impedance, serving as a good voltage buffer

A

Emitter follower

89
Q

It is the process of adding impurity element to an intrinsic semiconductor to change
its conductivity.

A

Doping

90
Q

Which of the following involves digital quantities?

A

Ten position switch

91
Q

That part of a computer instruction that defines what type of operation the computer
is
to execute on specified data.

A

Op code

92
Q

Which of the following improvements is (are) a result of the negative feedback in a
circuit?

A

Better stabilized voltage gain
Higher input impedance
Improved frequency response

93
Q

A digital circuit is also referred to as a/an _________ circuit

A

Logic

94
Q

All arithmetic operations take place in the _______ of a computer

A

ALU

95
Q

Class of mass memory devices that use a laser beam to write and read onto a specified coated disk

A

Optical disk memory

96
Q

In the Colpitts oscillator, the frequency is determined by _______ .both inductance
and capacitance. How many outputs does a full adder have?

A

2

97
Q

In Common Emitter BJT self biased configuration, placing capacitor across emitter
resistor will yields to what kind of biasing during AC analysis?

A

FIXED BIASED

98
Q

What do you called the “earth current”?

A

TELLURIC

99
Q

The loss of electrical energy in counter balancing the residual magnetism in each
cycle is called?

A

HYSTERISIS LOSS

100
Q

In AC circuits, what do you called the ratio of voltage function to current function?

A

impedance

101
Q

What is the analogous of circuit resistance in magnetic circuits?

A

reluctance

102
Q

a leading power factor indicates a more

A

capacitive load

103
Q

a lagging power factor indicates a more

A

inductive load

pec canvas (6 decks)

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