20+ Top Bipolar Transistors MCQs with Answers
In a bipolar transistor, the majority of carriers are ___________.
a) Electrons in the base and holes in the emitter and collector
b) Holes in the base and electrons in the emitter and collector
c) Electrons in the base and collector, and holes in the emitter
Answer: b
Hint: Bipolar transistors are named based on the majority carrier type in each region.
The base region of a bipolar transistor is ___________.
a) Heavily doped
b) Lightly doped
c) Intrinsic
Answer: b
Hint: The base is lightly doped to ensure majority carrier recombination.
The common configuration of a bipolar transistor is ___________.
a) Common base
b) Common emitter
c) Common collector
Answer: b
Hint: Common emitter configuration is widely used for amplification.
The current gain of a bipolar transistor is denoted by ___________.
a) α
b) β
c) γ
Answer: b
Hint: β is the common symbol for current gain.
In a common emitter configuration, the input is applied to the ___________.
a) Base
b) Emitter
c) Collector
Answer: a
Hint: The base is the input terminal in the common emitter.
The output current in a common emitter configuration is taken from the ___________.
a) Base
b) Emitter
c) Collector
Answer: c
Hint: The collector current is the output current.
The collector current in a common emitter configuration is ___________.
a) Less than the base current
b) Greater than the emitter’s current
c) Equal to the sum of base and emitter currents
Answer: c
Hint: The total collector current is the sum of base and emitter currents.
The common emitter current gain (β) of a bipolar transistor typically ranges from ___________.
a) 0.1 to 1
b) 1 to 10
c) 100 to 1000
Answer: c
Hint: β can be in the range of 100 to 1000 for typical transistors.
In a common base configuration, the input is applied to the ___________.
a) Base
b) Emitter
c) Collector
Answer: b
Hint: The emitter is the input terminal in the common base.
The output current in a common base configuration is taken from the ___________.
a) Base
b) Emitter
c) Collector
Answer: c
Hint: The collector current is the output current.
The input impedance of a common base configuration is ___________.
a) Low
b) High
c) Same as a common emitter
Answer: b
Hint: Common base has high input impedance.
The output impedance of a common emitter configuration is ___________.
a) Low
b) High
c) Same as a common collector
Answer: a
Hint: Common emitter has low output impedance.
The common collector configuration is also known as ___________.
a) Emitter follower
b) Base follower
c) Collector follower
Answer: a
Hint: The output voltage follows the input voltage in this configuration.
The voltage gain of an emitter follower configuration is ___________.
a) Less than 1
b) Greater than 1
c) Equal to 1
Answer: c
Hint: The emitter follower has a voltage gain of approximately 1.
The input impedance of an emitter follower configuration is ___________.
a) High
b) Low
c) Same as a common emitter
Answer: a
Hint: The emitter follower has high input impedance.
The output impedance of a common collector configuration is ___________.
a) Low
b) High
c) Same as a common emitter
Answer: b
Hint: Common collector has high output impedance.
In a bipolar transistor, the base current controls the ___________.
a) Collector’s current
b) Emitter’s current
c) Both collector and emitter currents
Answer: c
Hint: Base current controls both collector and emitter currents.
The cut-off region of a bipolar transistor is when ___________.
a) Base-emitter junction is forward biased
b) Base-emitter junction is reverse biased
c) Base-collector junction is forward biased
Answer: b
Hint: Cut-off occurs when the base-emitter junction is reverse-biased.
The saturation region of a bipolar transistor is when ___________.
a) Base-emitter junction is forward biased
b) Base-emitter junction is reverse biased
c) Base-collector junction is forward biased
Answer: a
Hint: Saturation occurs when the base-emitter junction is forward-biased.
The common base current gain (α) of a bipolar transistor typically ranges from ___________.
a) 0.1 to 1
b) 1 to 10
c) 100 to 1000
Answer: a
Hint: α can be in the range of 0.1 to 1 for typical transistors.
What term refers to the ability of a microwave circuit to propagate signals with minimal loss?
a) Dispersion
b) Attenuation
c) Propagation
d) Transmission
Answer: d) Transmission
Hint: Transmission in microwave circuits refers to the efficient propagation of signals with minimal loss.
Which parameter describes the rate of signal decay as it travels through a microwave circuit?
a) Velocity
b) Dispersion
c) Attenuation
d) Reflection
Answer: c) Attenuation
Hint: Attenuation quantifies the reduction in signal strength as it travels through a microwave circuit.
What is the velocity of electromagnetic waves in a vacuum?
a) 300,000,000 meters/second
b) 3,000 meters/second
c) 30,000,000 meters/second
d) 30,000,000,000 meters/second
Answer: a) 300,000,000 meters/second
Hint: The speed of light in a vacuum, and thus electromagnetic waves, is approximately 300,000,000 meters/second.
What is the main characteristic that distinguishes microwave frequencies from radio frequencies?
a) Wavelength
b) Phase
c) Amplitude
d) Frequency modulation
Answer: a) Wavelength
Hint: Microwaves have shorter wavelengths compared to radio frequencies, making them suitable for different applications.
What phenomenon occurs when a microwave signal encounters a change in medium causing some of the signal to bounce back?
a) Dispersion
b) Attenuation
c) Reflection
d) Transmission
Answer: c) Reflection
Hint: Reflection is the bouncing back of a microwave signal when it encounters a change in medium, such as a boundary between different materials.
What parameter represents the degree of phase advancement of a microwave signal per unit length?
a) Velocity
b) Wavelength
c) Propagation constant
d) Attenuation constant
Answer: c) Propagation constant
Hint: The propagation constant indicates how the phase of a microwave signal changes as it travels through a medium.
What term refers to the variation in propagation speed for different frequency components of a microwave signal?
a) Velocity
b) Dispersion
c) Attenuation
d) Reflection
Answer: b) Dispersion
Hint: Dispersion causes different frequency components of a microwave signal to propagate at different speeds.
What is the term for the maximum power that can be transferred from a source to a load in a microwave circuit?
a) Reflection coefficient
b) Attenuation constant
c) Maximum power transfer
d) Insertion loss
Answer: c) Maximum power transfer
Hint: Maximum power transfer occurs when the impedance of the source matches the impedance of the load in a microwave circuit.
What is the parameter that measures the ability of a microwave circuit to accept and radiate power?
a) Transmission coefficient
b) Attenuation coefficient
c) Reflection coefficient
d) Propagation coefficient
Answer: c) Reflection coefficient
Hint: The reflection coefficient quantifies the power that is reflected at an impedance discontinuity in a microwave circuit.
What term refers to the deviation of a microwave signal from its original shape as it travels through a medium?
a) Dispersion
b) Attenuation
c) Reflection
d) Diffraction
Answer: a) Dispersion
Hint: Dispersion causes a microwave signal to spread out and deviate from its original shape due to the variation in propagation speeds for different frequencies
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