What is the function of a transistor in a circuit?
a) To increase current
b) To amplify signals
c) To filter noise
d) To store data
Which type of transistor is commonly used in amplifiers?
a) PNP transistor
b) NPN transistor
c) JFET
d) FET
What is the most common material used for making transistors?
a) Silicon
b) Aluminum
c) Copper
d) Gold
Which of the following is a key application of a transistor?
a) Power generation
b) Signal amplification
c) Energy storage
d) Thermal management
What are the two main types of bipolar junction transistors (BJTs)?
a) NPN and PNP
b) N-type and P-type
c) Bipolar and unipolar
d) Junction and Field-effect
Which of the following transistor configurations provides the highest voltage gain?
a) Common emitter
b) Common base
c) Common collector
d) Common source
What does the “base” of a transistor control?
a) The flow of current through the collector
b) The voltage applied to the emitter
c) The current flow between the emitter and collector
d) The output power
In a transistor, what is the function of the collector?
a) To provide the input signal
b) To supply power to the base
c) To collect the output signal
d) To modulate the input signal
What is the purpose of a transistor in a switch?
a) To convert AC to DC
b) To control current flow between two parts of a circuit
c) To store charge for later use
d) To generate a signal
What is the main function of a Field-Effect Transistor (FET)?
a) To amplify signals
b) To switch electronic signals
c) To filter signals
d) To store and retrieve data
What does the “emitter” in a transistor do?
a) Supplies the current to the base
b) Collects the current from the collector
c) Provides the input signal
d) Supplies current to the collector
Which of the following is an example of a transistor application in everyday devices?
a) Solar panels
b) Radio receivers
c) Water heaters
d) Mechanical clocks
What type of transistor is used in modern microprocessors?
a) NPN transistor
b) PNP transistor
c) MOSFET
d) JFET
What is the primary difference between BJTs and FETs?
a) BJTs use a gate while FETs use a base
b) BJTs are current-controlled while FETs are voltage-controlled
c) FETs are less efficient than BJTs
d) BJTs use less power than FETs
Which transistor configuration is typically used in amplifiers?
a) Common emitter
b) Common collector
c) Common base
d) Common gate
Which of the following is a characteristic of a transistor in its “on” state?
a) High resistance
b) Low resistance
c) No current flow
d) No voltage drop
In a transistor, what does the “collector current” depend on?
a) The emitter voltage
b) The base voltage
c) The collector-emitter voltage
d) The temperature of the transistor
What happens when the base-emitter junction of a BJT is forward biased?
a) No current flows
b) The transistor is in its “on” state
c) The transistor is in its “off” state
d) The collector-emitter voltage becomes negative
Which of the following applications uses transistors in their switching role?
a) Television screens
b) Digital clocks
c) Washing machines
d) Traffic lights
Which is true for a PNP transistor when it is in its “on” state?
a) The base is negative relative to the emitter
b) The base is positive relative to the emitter
c) The emitter is negative relative to the base
d) The emitter is positive relative to the base
Which of the following is true for MOSFET transistors?
a) They use a gate to control current flow
b) They are only used in amplifiers
c) They have no drain terminal
d) They operate only in the “on” state
What is the function of the base in a transistor?
a) To collect electrons
b) To control the current flow between the collector and emitter
c) To supply power to the collector
d) To store charge for later use
What type of transistor is most commonly used in digital circuits for switching applications?
a) BJT
b) MOSFET
c) IGBT
d) JFET
Which transistor configuration is used when low output impedance is required?
a) Common emitter
b) Common base
c) Common collector
d) Common source
Which of the following transistor types is used to make logic gates in integrated circuits?
a) NPN transistor
b) PNP transistor
c) FET
d) MOSFET
What does the term “gain” refer to in the context of a transistor?
a) The amount of energy consumed by the transistor
b) The ability of the transistor to amplify an input signal
c) The size of the transistor
d) The efficiency of the transistor
What is the primary difference between an NPN and PNP transistor?
a) The NPN transistor is always “on,” while the PNP is “off”
b) The NPN transistor uses negative charge carriers, while the PNP uses positive charge carriers
c) The NPN transistor has a higher gain
d) The PNP transistor is used in digital circuits only
What is one advantage of using transistors over vacuum tubes?
a) Transistors consume more power
b) Transistors are smaller and more durable
c) Transistors cannot amplify signals
d) Transistors generate more heat
What happens when the base-emitter junction of a transistor is reverse biased?
a) The transistor is in its “on” state
b) The transistor is in its “off” state
c) Current flows freely between the collector and emitter
d) The transistor functions as a diode
Which is the typical application of a transistor in an oscillator circuit?
a) To amplify signals
b) To modulate signals
c) To generate a stable frequency signal
d) To store charge
