16128456
Descripción
Test por Hussain Basheer, actualizado hace más de 1 año
|
Creado por Hussain Basheer
hace alrededor de 6 años
|
|
Pregunta 1
Pregunta
If a semiconductor is brought down to temperature of absolute zero (0 Kelvin), it will become:
Respuesta
-
A conductor
-
A superconductor
-
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
-
The greater the band-gap width the less conductive is the material
-
The lesser the band-gap width the more insulating is the material
-
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
-
P and N type conductivities are in the conduction band
-
P-type conductivity is in the conduction band, and N-conductivity is in the valence band
-
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
-
Electrons
-
P-type carriers are “holes”, and N-type are electrons
-
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:
Respuesta
-
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
-
Both types are achieved from doping with group IV
-
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
-
N = P
-
N > P
-
N < P
Pregunta 7
Pregunta
For semiconducting materials, charge carrier species called holes are best described as:
Respuesta
-
Electrons moving in opposite direction
-
Protons
-
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
-
In N-type semiconductors, electrons are majority carriers and holes are minority carriers
-
In P-type semiconductors, majority carriers are electrons, and minority charge carriers are holes
-
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:
Respuesta
-
There are two p-n junctions
-
There are three p-n junctions
-
There is one p-n junction
Pregunta 10
Pregunta
The two main functions of the transistor are:
Respuesta
-
Polarizer and oscillator
-
Amplifier and switch
-
Rectifier and attenuator
Pregunta 11
Pregunta
Choose the FALSE statement. Electrical amplifiers are used for:
Respuesta
-
Voltage
-
Frequency
-
Current
Pregunta 12
Pregunta
The magnitude of electrical impedance of biological tissues is the (Pythagorean) sum of:
Respuesta
-
Resistance and capacitive reactance
-
Inductive and capacitive reactance
-
Resistance and inductive reactance
Pregunta 13
Pregunta
What type of transducer is the piezoelectric crystal in ultrasonic equipment, when working in receiving mode?
Respuesta
-
Generative transducer
-
Both, generative and parametric
-
Parametric transducer
Pregunta 14
Pregunta
The “band gap” in semiconductor theory is defined as:
Respuesta
-
The distance between valence and conduction bands
-
The frequency gap between AM and FM radio bands
-
The energy gap between valence and conduction bands
Pregunta 15
Pregunta
When temperature increases, the band gap in a semiconductor:
Respuesta
-
Increases, due to increased kinetic energy of atoms
-
Remains the same, because electrons are bound in their orbits
-
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:
Respuesta
-
Near the middle of the band gap
-
Near the conduction band
-
Near the valence band
Pregunta 17
Pregunta
When temperature increases, the conductivity of semiconductors:
Respuesta
-
Increases
-
Decreases
-
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:
Respuesta
-
Near the middle of the band gap
-
Near the conduction band
-
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:
Respuesta
-
Boron (B), valence III
-
Phosphorus (P), valence V
-
Tin (Sn), valence IV
Pregunta 20
Pregunta
Electric circuit components composed of single p-n junction are called:
Respuesta
-
Capacitors
-
Transistors
-
Diodes
Pregunta 21
Pregunta
What is the mathematical relation between the electrical resistance (R) in a semiconductor and the temperature (T)?
Respuesta
-
Linear (as T increases, R decreases with constant rate)
-
Proportional (as T increases, R increases with constant rate)
-
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?
Respuesta
-
Quadratic (voltage increase as the square of the distance)
-
Inversely proportional (decreases as one over the distance)
-
Exponential (increases with increasing rate)
Pregunta 23
Pregunta
Which of the following statements is true about the element Germanium?
Respuesta
-
The resistivity at room temperature is lower than that of Copper
-
When heated the resistivity decreases
-
The resistivity is constant over a wide range
Pregunta 24
Pregunta
The most common material in modern integrated circuits is:
Respuesta
-
Silicon
-
Carbon
-
Titanium
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.