1. The main difference between a BJT and a FET is:
Answer:
Explanation:
The primary difference between Bipolar Junction Transistors (BJTs) and Field-Effect Transistors (FETs) is that BJTs are current-controlled devices, whereas FETs are voltage-controlled.
2. In a diode, the 'P' type material contains:
Answer:
Explanation:
In a semiconductor diode, the P-type material is doped to create excess holes, which act as the majority charge carriers.
3. The purpose of a capacitor in an AC circuit is to:
Answer:
Explanation:
In AC circuits, capacitors block direct current (DC) while allowing alternating current (AC) to pass through.
4. Operational Amplifiers are used for:
Answer:
Explanation:
Operational Amplifiers (Op-Amps) are primarily used for signal amplification purposes in various electronic circuits.
5. The cut-off frequency of an RC low pass filter is determined by:
Answer:
Explanation:
The cut-off frequency of an RC low pass filter is determined by both the resistance (R) and the capacitance (C) of the circuit.
6. A Zener diode is typically used for:
Answer:
Explanation:
A Zener diode is commonly used in circuits for voltage regulation, as it can maintain a constant voltage over a range of current.
7. The main characteristic of a Band-Pass Filter is:
Answer:
Explanation:
A band-pass filter allows frequencies within a specific range to pass through while attenuating frequencies outside that range.
8. A Bipolar Junction Transistor (BJT) is composed of how many layers of semiconductor material?
Answer:
Explanation:
A Bipolar Junction Transistor (BJT) is made up of three layers of semiconductor material, forming two PN junctions.
9. The main purpose of a bridge rectifier is to:
Answer:
Explanation:
The primary purpose of a bridge rectifier is to convert alternating current (AC) into direct current (DC).
10. In an NPN transistor, the arrow on the emitter symbol always points:
Answer:
Explanation:
In an NPN transistor, the arrow on the emitter symbol points outward, indicating the direction of conventional current flow.
11. An ideal Op-Amp has:
Answer:
Explanation:
An ideal operational amplifier has infinite input impedance, zero output impedance, and infinite bandwidth.
12. In a common emitter configuration, the transistor provides:
Answer:
Explanation:
A common emitter configuration provides both current and voltage amplification.
13. The primary purpose of a transformer is to:
Answer:
Explanation:
The main function of a transformer is to change the voltage level while transferring power from one circuit to another.
14. The ripple factor in a rectifier circuit is a measure of:
Answer:
Explanation:
The ripple factor in a rectifier circuit measures the amount of AC components in the DC output, indicating the purity of the DC output.
15. In an LC circuit, the resonant frequency is determined by:
Answer:
Explanation:
In an LC circuit, the resonant frequency is determined by both the inductance (L) and the capacitance (C) values.
16. A Darlington pair is used to:
Answer:
Explanation:
A Darlington pair is a configuration of two bipolar transistors to provide a very high current gain.
17. The primary application of a Schmitt Trigger is to:
Answer:
Explanation:
A Schmitt Trigger is used to convert analog signals into digital by providing a clear distinction between high and low states.
18. In a full-wave rectifier, the number of diodes used is:
Answer:
Explanation:
A full-wave rectifier typically uses four diodes to rectify both halves of the input AC signal.
19. A photodiode is used to:
Answer:
Explanation:
A photodiode is a semiconductor device that converts light into electrical current, used primarily for light detection.
20. The slew rate of an Op-Amp is defined as:
Answer:
Explanation:
The slew rate of an Op-Amp is the maximum rate at which the output voltage can change in response to a change in the input signal.
21. The primary function of a varactor diode is:
Answer:
Explanation:
A varactor diode, also known as a varicap, is used primarily for frequency modulation and tuning due to its variable capacitance properties.
22. A resistor's color code is used to indicate its:
Answer:
Explanation:
The color bands on a resistor are used to indicate its resistance value, following a standardized color code.
23. The function of a flyback diode in a circuit is to:
Answer:
Explanation:
A flyback diode is used in circuits to protect against voltage spikes, especially in inductive loads.
24. In a differential amplifier, the output is taken from:
Answer:
Explanation:
In a differential amplifier, the output is typically taken from between the two collectors, providing the difference between the two input signals.
25. The primary use of a crystal oscillator is to:
Answer:
Explanation:
A crystal oscillator is used to generate precise, stable high-frequency signals, commonly used in clocks and frequency synthesizers.