Q. In a small-signal model, what does the transconductance (gm) of a BJT represent?
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A.
The input resistance
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B.
The output resistance
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C.
The change in output current per change in input voltage
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D.
The change in input current per change in output voltage
Solution
Transconductance (gm) indicates how much the output current changes in response to a change in input voltage.
Correct Answer:
C
— The change in output current per change in input voltage
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Q. In a thyristor, what is the role of the gate terminal?
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A.
To provide a path for current
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B.
To control the turn-on of the device
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C.
To dissipate heat
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D.
To connect to the load
Solution
The gate terminal is used to trigger the thyristor into conduction.
Correct Answer:
B
— To control the turn-on of the device
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Q. In semiconductor physics, what is the purpose of doping?
-
A.
To increase the thermal conductivity
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B.
To create p-type or n-type materials
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C.
To enhance the mechanical strength
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D.
To reduce the energy band gap
Solution
Doping introduces impurities into a semiconductor to create p-type or n-type materials, enhancing conductivity.
Correct Answer:
B
— To create p-type or n-type materials
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Q. What is the main advantage of using a thyristor over a standard diode?
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A.
Higher current rating
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B.
Ability to control power
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C.
Lower forward voltage drop
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D.
Faster switching speed
Solution
Thyristors can control power and are used in applications requiring switching.
Correct Answer:
B
— Ability to control power
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Q. What is the main purpose of an operational amplifier?
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A.
To amplify current
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B.
To amplify voltage
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C.
To convert AC to DC
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D.
To switch signals
Solution
Operational amplifiers are primarily used to amplify voltage signals.
Correct Answer:
B
— To amplify voltage
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Q. What is the primary function of a thyristor?
-
A.
To amplify signals
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B.
To rectify AC to DC
-
C.
To switch electrical power
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D.
To regulate voltage
Solution
Thyristors are primarily used as electronic switches to control power in circuits.
Correct Answer:
C
— To switch electrical power
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Q. What is the primary role of an operational amplifier in a circuit?
-
A.
To act as a switch
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B.
To amplify voltage signals
-
C.
To convert AC to DC
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D.
To store energy
Solution
Operational amplifiers are designed to amplify voltage signals in various applications.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the primary use of a phototransducer?
-
A.
To convert light into electrical signals
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B.
To convert sound into electrical signals
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C.
To convert heat into electrical signals
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D.
To convert mechanical motion into electrical signals
Solution
Phototransducers are used to convert light into electrical signals.
Correct Answer:
A
— To convert light into electrical signals
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Q. What type of device is a BJT?
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A.
Voltage-controlled device
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B.
Current-controlled device
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C.
Temperature-controlled device
-
D.
Frequency-controlled device
Solution
A BJT (Bipolar Junction Transistor) is a current-controlled device.
Correct Answer:
B
— Current-controlled device
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Q. What type of rectifier uses a thyristor?
-
A.
Half-wave rectifier
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B.
Full-wave rectifier
-
C.
Controlled rectifier
-
D.
Bridge rectifier
Solution
Controlled rectifiers utilize thyristors to control the output voltage and current.
Correct Answer:
C
— Controlled rectifier
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Q. Which component is used to convert an analog signal to a digital signal?
-
A.
Amplifier
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B.
ADC (Analog to Digital Converter)
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C.
DAC (Digital to Analog Converter)
-
D.
Rectifier
Solution
An ADC converts analog signals into digital signals for processing.
Correct Answer:
B
— ADC (Analog to Digital Converter)
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Q. Which of the following describes a FET?
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A.
It is a current-controlled device
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B.
It is a voltage-controlled device
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C.
It requires a gate current to operate
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D.
It has no gate terminal
Solution
A FET (Field Effect Transistor) is a voltage-controlled device that operates by applying voltage to the gate.
Correct Answer:
B
— It is a voltage-controlled device
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Q. Which of the following describes the operation of a thyristor in the 'off' state?
-
A.
It conducts current freely
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B.
It blocks current flow
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C.
It amplifies the input signal
-
D.
It regulates voltage
Solution
In the 'off' state, a thyristor blocks current flow until triggered by the gate.
Correct Answer:
B
— It blocks current flow
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Q. Which of the following is a characteristic of a transducer?
-
A.
It can only convert electrical energy to mechanical energy
-
B.
It can convert one form of energy to another
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C.
It is always a passive device
-
D.
It cannot be used in feedback systems
Solution
Transducers convert one form of energy to another, such as mechanical to electrical.
Correct Answer:
B
— It can convert one form of energy to another
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Q. Which of the following is NOT a type of FET?
-
A.
JFET
-
B.
MOSFET
-
C.
BJT
-
D.
IGBT
Solution
BJT (Bipolar Junction Transistor) is not a type of FET (Field Effect Transistor).
Correct Answer:
C
— BJT
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Q. Which of the following is NOT a type of transducer?
-
A.
Thermocouple
-
B.
Photodiode
-
C.
Resistor
-
D.
Piezoelectric sensor
Solution
A resistor does not convert energy; it simply resists the flow of current.
Correct Answer:
C
— Resistor
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