16128456
Descripción
Test por Hussain Basheer, actualizado hace más de 1 año
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Creado por Hussain Basheer
hace más de 5 años
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Pregunta 1
Pregunta
If a semiconductor is brought down to temperature of absolute zero (0 Kelvin), it will become:
Respuesta
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A conductor
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A superconductor
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An insulator
Pregunta 2
Pregunta
According to Band Theory of Solids, what can be said about the relationship between band-gap width and the tendency of material to conduct electricity?
Respuesta
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The greater the band-gap width the less conductive is the material
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The lesser the band-gap width the more insulating is the material
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The greater the band-gap width the more conductive is the material
Pregunta 3
Pregunta
According to Band Theory of Solids, what can be said about P- and N- type conductivity with regard to the location of the electron bands?
Respuesta
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P and N type conductivities are in the conduction band
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P-type conductivity is in the conduction band, and N-conductivity is in the valence band
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P-type conductivity is in the valence band, and N-conductivity is in the conduction band
Pregunta 4
Pregunta
What are the respective current carriers for N- and P-type conductivity?
Respuesta
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Electrons
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P-type carriers are “holes”, and N-type are electrons
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P-type are positrons, and N-type are “holes”
Pregunta 5
Pregunta
Typical semiconductors such as Silicon and Germanium are group IV elements. Choose the correct statement regarding the doping and the type of conductivity (N or P) acquired, after doping:
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P-type conductivity is achieved by doping with elements from group V, and N-type conductivity is achieved by doping with elements from group III
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Both types are achieved from doping with group IV
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P-type conductivity is achieved by doping with elements from group III, and N-type conductivity is achieved by doping with elements from group V
Pregunta 6
Pregunta
What is the relationship between N- and P- type charge carriers for intrinsic (undoped) semiconductors?
Respuesta
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N = P
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N > P
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N < P
Pregunta 7
Pregunta
For semiconducting materials, charge carrier species called holes are best described as:
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Electrons moving in opposite direction
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Protons
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Virtual particles signifying electron vacancy
Pregunta 8
Pregunta
In doped (extrinsic) semiconductors, the predominant current carriers are called majority charge carriers, and secondary carriers are called minority. Which statement is true for N-and P-type semiconductors:
Respuesta
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In N-type semiconductors, electrons are majority carriers and holes are minority carriers
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In P-type semiconductors, majority carriers are electrons, and minority charge carriers are holes
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In N-type semiconductors, both types of carriers are equally present
Pregunta 9
Pregunta
Transistors are made of N- and P-type semiconductors arranged in a such way that:
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There are two p-n junctions
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There are three p-n junctions
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There is one p-n junction
Pregunta 10
Pregunta
The two main functions of the transistor are:
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Polarizer and oscillator
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Amplifier and switch
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Rectifier and attenuator
Pregunta 11
Pregunta
Choose the FALSE statement. Electrical amplifiers are used for:
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Voltage
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Frequency
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Current
Pregunta 12
Pregunta
The magnitude of electrical impedance of biological tissues is the (Pythagorean) sum of:
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Resistance and capacitive reactance
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Inductive and capacitive reactance
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Resistance and inductive reactance
Pregunta 13
Pregunta
What type of transducer is the piezoelectric crystal in ultrasonic equipment, when working in receiving mode?
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Generative transducer
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Both, generative and parametric
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Parametric transducer
Pregunta 14
Pregunta
The “band gap” in semiconductor theory is defined as:
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The distance between valence and conduction bands
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The frequency gap between AM and FM radio bands
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The energy gap between valence and conduction bands
Pregunta 15
Pregunta
When temperature increases, the band gap in a semiconductor:
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Increases, due to increased kinetic energy of atoms
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Remains the same, because electrons are bound in their orbits
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Decreases, due to electron-phonon interactions
Pregunta 16
Pregunta
When semiconductor is doped with element of lower valence (P-type doping) it becomes a donor (gives off electrons) and there is a shift in the energy band gap. The new electron levels are:
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Near the middle of the band gap
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Near the conduction band
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Near the valence band
Pregunta 17
Pregunta
When temperature increases, the conductivity of semiconductors:
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Increases
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Decreases
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Remains the same
Pregunta 18
Pregunta
When semiconductor is doped with element of higher valence (N-type doping) it becomes an acceptor (takes electrons) and there is a shift in the energy band gap. The new electron levels are:
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Near the middle of the band gap
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Near the conduction band
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Near the valence band
Pregunta 19
Pregunta
When Silicon (Si) is doped with one of the following elements, it acquires P-type conductivity (holes are the majority carriers). Choose the one:
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Boron (B), valence III
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Phosphorus (P), valence V
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Tin (Sn), valence IV
Pregunta 20
Pregunta
Electric circuit components composed of single p-n junction are called:
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Capacitors
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Transistors
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Diodes
Pregunta 21
Pregunta
What is the mathematical relation between the electrical resistance (R) in a semiconductor and the temperature (T)?
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Linear (as T increases, R decreases with constant rate)
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Proportional (as T increases, R increases with constant rate)
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Exponential decay (as T increases, R decreases with increasing rate)
Pregunta 22
Pregunta
What is the mathematical relationship between the generated voltage in a photodiode and the distance from the light source?
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Quadratic (voltage increase as the square of the distance)
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Inversely proportional (decreases as one over the distance)
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Exponential (increases with increasing rate)
Pregunta 23
Pregunta
Which of the following statements is true about the element Germanium?
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The resistivity at room temperature is lower than that of Copper
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When heated the resistivity decreases
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The resistivity is constant over a wide range
Pregunta 24
Pregunta
The most common material in modern integrated circuits is:
Respuesta
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Silicon
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Carbon
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Titanium
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