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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
what is the diameter of an atom
about 10^-10 m
26
defined as a closed path in which magnetic induction or flux flows
magnetic circuit
27
the force which sets up or tens to set up magnetic flux in a magnetic circuit
magnetomotive force
28
the property of a material which opposes the creation of magnetic flux in it
reluctance
29
it its the reciprocal of reluctance and implies the case of readiness which magnetic flux is developed
permeance
30
the ability of a material to conduct magnetic flux through it
permeability
31
the ratio of the permeability of material to the permeability of air or vacuum
relative permeability
32
permeance is analogous to
conductance
33
the property of the magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as
retentivity
34
which of the following has the least number of valence electrons
conductor
35
a good conductor has how many valence electrons
1
36
which element has four valence electrons
semiconductor
37
hysteresis refers to the ____ between flux density of the material and the magnetizing force applied
lagging effect
38
hydrogen is an example of
diamagnetic
39
cobalt is an example of
ferromagnetic
40
the evaporation of electrons from a heated surface is called
thermionic emission
41
electron is greek word for
amber
42
gases whose particles are charged are known as
plasma
43
what are the current carriers in a conductor
valence electron
44
When a battery is charge n an overvoltage supply, this may result to?
sulphation
45
True or false: When a number of stages are connected in parallel, the overall gain is the product of the individual stage gains
false
46
True of False: A number of op-amp stages can be used to provide separate gains
true
47
A type of FET having no physical channel between source and drain
DE-MOSFET
48
What is the process by which AC is converted to pulsating DC
rectification
49
The arrow in any FET symbol represents the type of material used by?
Substrate
50
What is majority carrier when a PNP CE transistor configuration is in operation?
hole
51
It is a circuit quantity defines as the amount of charge per unit time?
Current
52
When a battery is charge in over volatge supply, this may result to?
short
53
What is the unit of angular velocity (w)?
rad/s
54
A circuit component that opposes to the flow of changing current?
inductor
55
A hybrid parameter (H-parameter) equivalent to β?
hfe
56
A network that employs a diode to remove away a portion of the input signal without distorting the remaining signal waveform?
clipper
57
What is the unit of the reactive power in AC circuits?
VAR
58
The ratio of the circumference of any circle to the diameter of the circle is:
AN IRRATIONAL NUMBER
59
If the discriminant of a quadratic equation is greater than zero, the roots of the equation are
real and distinct
60
At the maximum point, the second derivative of the curve is
Negative
61
A non-terminating and non-periodic decimal is
IRRATIONAL
62
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.
hard saturation
63
Which capacitance dominates in the forward-bias region?
diffusion
64
It occurs when a conduction-band electron loses energy and falls back into a hole in the valence band.
RECOMBINATION
65
It is an extremely small amount of current that exists in a reverse biased diode.
reverse saturation current
66
What unit is used to represent the level of a diode forward current?
mA
67
The _____ diode model is employed most frequently in the analysis of electronic systems.
PRACTICAL
68
Across which of the following components of a power supply does the average (dc) voltage exist?
center tap
69
What is the typical value of the current gain of a common-base configuration?
<1
70
Which capacitance dominates in the reverse-bias region?
DEPLETION
71
The ________ is the minimum energy required to dislodge an electron from its covalent bond.
BAND GAP ENERGY
72
What is the purpose of an additional RC section in a power supply circuit?
decrease ac voltage component
73
It is define as a large initial current that flows through the diode of a rectifier.
surge current
74
What is the unit of the parameter hob of a BJT?
Ohm
75
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.
Linear approximation model
76
Charge carriers move in semiconductors via two mechanisms: ________ and ________.
drift, diffusion
77
In a simple series regulator circuit, which of the following components is the controlling element?
Transistor
78
The current gain of a Darlington pair is called ________.
Super beta
79
The time required for the minority carriers to return to the majority carrier state in the opposite material.
storage time
80
In which of the following applications is a pulsating dc voltage suitable?
Battery charger
81
What does a high resistance reading in both forward- and reverse-bias directions indicate?
Open diode
82
For proper operation, the ________ is forward biased and the ________ is reversebiased
BE and BC junction
83
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.
Avalanche Effect
84
At what region of operation is the base-emitter junction forward biased and the base collector junction reverse biased?
LINEAR
85
What is the typical energy gap of silicon semiconductor?
1.1 eV
86
How many terminals can a MOSFET have?
2
87
Which of the following semiconductor material is sensitive to temperature change?
Ge
88
The ___________ provides a voltage gain less than unity, a high input impedance, and a low output impedance, serving as a good voltage buffer
Emitter follower
89
It is the process of adding impurity element to an intrinsic semiconductor to change its conductivity.
Doping
90
Which of the following involves digital quantities?
Ten position switch
91
That part of a computer instruction that defines what type of operation the computer is to execute on specified data.
Op code
92
Which of the following improvements is (are) a result of the negative feedback in a circuit?
Better stabilized voltage gain Higher input impedance Improved frequency response
93
A digital circuit is also referred to as a/an _________ circuit
Logic
94
All arithmetic operations take place in the _______ of a computer
ALU
95
Class of mass memory devices that use a laser beam to write and read onto a specified coated disk
Optical disk memory
96
In the Colpitts oscillator, the frequency is determined by _______ .both inductance and capacitance. How many outputs does a full adder have?
2
97
In Common Emitter BJT self biased configuration, placing capacitor across emitter resistor will yields to what kind of biasing during AC analysis?
FIXED BIASED
98
What do you called the “earth current”?
TELLURIC
99
The loss of electrical energy in counter balancing the residual magnetism in each cycle is called?
HYSTERISIS LOSS
100
In AC circuits, what do you called the ratio of voltage function to current function?
impedance
101
What is the analogous of circuit resistance in magnetic circuits?
reluctance
102
a leading power factor indicates a more
capacitive load
103
a lagging power factor indicates a more
inductive load

pec canvas (6 decks)

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