# Basic Electronics Questions

Basic Introduction Questions

1. What is an ideal voltage  source?

Answer:  Ideal voltage source is defined as the energy source which gives constant voltage across its terminals irrespective of the current drawn through its terminals.

In other words the voltage source (D.C or A.C) will be called ‘ideal’.

2. What is an ideal current source?

• Ideal current source is the source which gives constant current an its terminals irrespective of the voltage appearing across its terminals.
• Ideal current source is the source which supplies a constant current to a load even if  its impedance varies.

3. What is a practical voltage source?

Answer: A practical voltage source is that which has very low internal resistance(or impedance) as compared to load resistance (or impedance).

4. What is a practical current source?

Answer:  In most applications, ideal source are approximation. The internal resistance Rin of a voltage source, which responsible for a drop in terminal voltage of a source on load is quite small in comparison to the load resistance of a network connected across the voltage source.

5. The voltage out of an ideal voltage source is

6. The current out of an ideal current source is

7. The path between two points along which an electrical current can be carried is called

8. The formula for current as per Ohm’s Law is

9. The unit of electrical resistance is

10. In a constant voltage DC circuit, when the resistance increases, the current will

Basic Semiconductor Theory Questions

1. Number of valence electrons in a silicon atom are

2. The most commonly used semiconductor element is

3. Copper is a

4. Number of protons in the nucleus of a silicon atom are

5. The valence electron of a conductor are also called as

6. An intrinsic semiconductor at room temperature has

Answer: A few electrons and holes

7. At room temperature, an intrinsic semiconductor has some holes in it due to

8. The number of holes in an intrinsic semiconductor is

Answer: Equal to number of electrons

9. Holes act as

10. To produce P-type semiconductors, you need to add

11. Electrons are the minority carriers in

12. A p-type semiconductor contains

13. How many electrons does pentavalent atoms have?

14. Negative ions are

Answer: Atoms that lost an electron

Basic Semiconductor Diode Questions

1. Depletion layer is caused by _________

2. The reverse current in a diode is usually

3. Avalanche in Diode occurs at

4. The potential barrier of a silicon diode is

5. The reverse saturation current in a Silicon Diode is _____ than that of Germanium Diode

6. A Diode is a

7. The diode current is large for which condition

8. The output voltage signal of a bridge rectifier is

9. If the maximum DC current rating of diodes in Bridge Rectifier is 1A, what is the maximum DC load current?

10. Voltage multipliers produce ?

Answer: High voltage and low current.

11. What is a Clipper?

•  A wave shaping circuit which controls the shape of output waveform by removing a portion of the applied wave is known as clipping.
• For a clipping circuit at least one resistance and one diode is required.

12. What is a Clamper?

Answer: A clamping circuit is a device that ‘clamps’ a signal to a different DC level. A clamping circuit must have a diode, a resistance and a capacitor, an independent DC supply is also required to introduce an additional shift.

13. Zener diode can be described as.

Answer: A Device with constant voltage.

14. If the Zener Diode is connected in wrong polarity, the voltage across the load is

Basic Transistor Questions

1. Number of PN Junctions in a Transistor

2. The doping concentration of Base in NPN Transistor is

3. The Base – Emitter Diode (Base – Emitter Junction) in an NPN Transistor is

4. The size comparison between Base, Emitter and Collector is

Answer: Collector > Emitter > Base

5. The Base – Collector Diode (Base Collector Junction) is usually

6. The DC Current Gain of a Transistor is

Answer: Ratio of collector current to base current

7. If base current is 100µA and current gain is 100, then collector current is

8. The majority carriers in NPN and PNP Transistors are

9. A Transistor acts as a

10. The relation between Base Current IB, Emitter Current IE and Collector Current IC is

11. The total power dissipated by a transistor is a product of collector current and

12. The input impedance of Common Emitter Configuration is

13. The output impedance of Common Emitter Configuration is

14. The current gain in Common Base configuration (α) is

Answer: Ratio of collector current to emitter current (IC/IE)

15. Relation between α and ß is

Answer: ß = α / (1 – α)

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