test your knowledge about Electronics device

Approved & Edited by ProProfs Editorial Team

The editorial team at ProProfs Quizzes consists of a select group of subject experts, trivia writers, and quiz masters who have authored over 10,000 quizzes taken by more than 100 million users. This team includes our in-house seasoned quiz moderators and subject matter experts. Our editorial experts, spread across the world, are rigorously trained using our comprehensive guidelines to ensure that you receive the highest quality quizzes.

Learn about Our Editorial Process

| By Blogblog1968

Blogblog1968

Community Contributor

Quizzes Created: 5 | Total Attempts: 8,140

Questions: 10 | Attempts: 1,670 | Updated: Jul 17, 2024

Questions

Settings

Create your own Quiz

Share on Facebook Share on Twitter Share on Whatsapp Share on Pinterest Share on Email Copy to Clipboard Embed on your website

Test Your Knowledge About Electronics Device - Quiz

Let us help each other, fellow ECE reviewees and students. Do not result to such lowly behavior.
As they say, a rising tide floats all boats. Lets mind our manners. Respect, engineers.
Good for testing your knowledge and mastery on different review materials. Question bank inlcudes Malvino

Questions and Answers

1.

An ideal voltage source has
- A.
  
  Zero internal resistance
- B.
  
  Infinite internal resistance
- C.
  
  A load-dependent voltage
- D.
  
  A load-dependent current
Correct Answer
A. Zero internal resistance

Explanation
An ideal voltage source has zero internal resistance because it is able to provide a constant voltage regardless of the load connected to it. This means that the voltage source can deliver the same voltage without any loss or drop in voltage due to internal resistance. Therefore, the ideal voltage source is considered to have zero internal resistance.

Rate this question:
2.

A real voltage source has
- A.
  
  Zero internal resistance
- B.
  
  Infinite internal resistance
- C.
  
  A small internal resistance
- D.
  
  A large internal resistance
Correct Answer
C. A small internal resistance

Explanation
A real voltage source typically has a small internal resistance. This means that the voltage source can deliver a relatively large amount of current without a significant drop in voltage. A small internal resistance allows for efficient transfer of electrical energy from the source to the connected load.

Rate this question:
3.

The net charge of a neutral copper atom is
- A.
  
  0
- B.
  
  +1
- C.
  
  - 1
- D.
  
  +4
Correct Answer
A. 0

Explanation
A neutral copper atom has an equal number of protons and electrons. Protons have a positive charge, while electrons have a negative charge. Since the number of positive charges is balanced by the number of negative charges, the overall charge of a neutral copper atom is 0.

Rate this question:
4.

At room temperature an intrinsic silicon crystal acts approximately like
- A.
  
  Battery
- B.
  
  Conductor
- C.
  
  Insulator
- D.
  
  Piece of copper wire
Correct Answer
C. Insulator

Explanation
At room temperature, an intrinsic silicon crystal acts like an insulator. This is because the electrons in the crystal's valence band are tightly bound to their atoms and do not have enough energy to move freely. Therefore, the crystal does not conduct electricity well. However, when the temperature increases or the crystal is doped with impurities, it can become a conductor.

Rate this question:
5.

What causes the depletion layer?
- A.
  
  Doping
- B.
  
  Recombination
- C.
  
  Barrier Potential
- D.
  
  Ions
Correct Answer
B. Recombination

Explanation
Recombination is the process in which an electron from the conduction band recombines with a hole in the valence band, resulting in the release of energy. This recombination process leads to the formation of a depletion layer in a semiconductor. As electrons and holes recombine, they neutralize each other, creating a region with no free charge carriers. This region is known as the depletion layer, which acts as a barrier to the flow of current in a semiconductor device.

Rate this question:
6.

With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?
- A.
  
  0 degrees
- B.
  
  90 degrees
- C.
  
  180 degrees
- D.
  
  360 degrees
Correct Answer
C. 180 degrees

Explanation
In a half-wave rectified voltage, the load current flows for only half of the cycle. This means that the load current flows for 180 degrees of the cycle. During the positive half-cycle of the input voltage, the diode conducts and allows the current to flow through the load resistor. However, during the negative half-cycle, the diode blocks the current flow, resulting in no current through the load resistor. Therefore, the load current flows for 180 degrees of the cycle.

Rate this question:
7.

The load voltage is approximately constant when a zener diode is
- A.
  
  Forward-biased
- B.
  
  Reverse-biased
- C.
  
  Operating in the breakdown region
- D.
  
  Unbiased
Correct Answer
C. Operating in the breakdown region

Explanation
When a zener diode is operating in the breakdown region, it is able to maintain a relatively constant voltage across its terminals regardless of changes in the input voltage. This is because the zener diode is designed to operate in this region and has a specific breakdown voltage. As a result, it can regulate the voltage and keep it stable, making the load voltage approximately constant. In contrast, when the zener diode is forward-biased, reverse-biased, or unbiased, it does not exhibit the same voltage regulation capabilities.

Rate this question:
8.

For typical operation, you need to use reverse bias with a
- A.
  
  Zener diode
- B.
  
  Photodiode
- C.
  
  Varactor
- D.
  
  All of the above
Correct Answer
D. All of the above

Explanation
All of the above options require the use of reverse bias for typical operation. A Zener diode is designed to operate in reverse breakdown region, allowing it to regulate voltage. A photodiode also operates in reverse bias to generate a photocurrent when exposed to light. Similarly, a varactor diode is used in reverse bias to vary its capacitance, making it suitable for use in tuning circuits. Therefore, all three options mentioned in the question require reverse bias for their intended operation.

Rate this question:
9.

. If the depletion layer gets wider, the capacitance
- A.
  
  Decreases
- B.
  
  Stays the same
- C.
  
  Increases
- D.
  
  Is variable
Correct Answer
A. Decreases

Explanation
When the depletion layer gets wider, it means that the distance between the positive and negative charges in a capacitor increases. This increased distance leads to a decrease in the capacitance of the capacitor. Capacitance is directly proportional to the surface area of the plates and inversely proportional to the distance between them. Therefore, as the depletion layer widens, the capacitance decreases.

Rate this question:
10.

The currents of a pnp transistor are
- A.
  
  Usually smaller than npn currents
- B.
  
  Opposite npn currents
- C.
  
  Usually larger than npn currents
- D.
  
  Negative
Correct Answer
B. Opposite npn currents

Explanation
The correct answer is "Opposite npn currents." In a pnp transistor, the direction of current flow is opposite to that of an npn transistor. In an npn transistor, the current flows from the emitter to the base and then to the collector. However, in a pnp transistor, the current flows from the emitter to the base and then to the collector in the opposite direction. Therefore, the currents in a pnp transistor are opposite to the currents in an npn transistor.

Rate this question:

Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

Current Version
Jul 17, 2024

Quiz Edited by
ProProfs Editorial Team
Jun 24, 2011

Quiz Created by
Blogblog1968

Test Your Knowledge About Electronics Device

An ideal voltage source has

A real voltage source has

The net charge of a neutral copper atom is

At room temperature an intrinsic silicon crystal acts approximately like

What causes the depletion layer?

With a half-wave rectified voltage across the load resistor, load current flows for what part of a cycle?

The load voltage is approximately constant when a zener diode is

For typical operation, you need to use reverse bias with a

. If the depletion layer gets wider, the capacitance

The currents of a pnp transistor are