Electronic Cables and Connectors MCQ Quiz - Objective Question with Answer for Electronic Cables and Connectors - Download Free PDF

Explanation:

Unshielded Twisted Pair (UTP) Cables

Definition: Unshielded Twisted Pair (UTP) cables are a type of twisted pair cables that are commonly used for various telecommunications and networking applications. They consist of pairs of wires twisted together to reduce electromagnetic interference (EMI) from external sources and crosstalk between adjacent pairs within the cable.

Working Principle: UTP cables work by twisting the pairs of wires together, which helps to cancel out electromagnetic interference (EMI) from external sources and minimize crosstalk between the pairs. The twisting of the wires causes the magnetic fields generated by the current in each wire to cancel each other out, thus reducing the overall EMI.

Advantages:

• Cost-effective: UTP cables are generally less expensive than shielded cables, making them a popular choice for many networking applications.
• Ease of installation: UTP cables are lighter and more flexible, making them easier to install and handle compared to shielded cables.
• Widely used: UTP cables are commonly used in local area networks (LANs) and other telecommunications applications.

Disadvantages:

• Susceptibility to EMI: UTP cables do not have shielding, which makes them more susceptible to electromagnetic interference (EMI) compared to shielded cables.
• Limited distance: UTP cables are typically used for short-distance communication due to their susceptibility to EMI and signal attenuation over longer distances.

Applications: UTP cables are widely used in various applications, including local area networks (LANs), telephone systems, and other telecommunications infrastructure where cost and ease of installation are important considerations.

Correct Option Analysis:

The correct option is:

Option 1: They have a higher resistance to EMI than STP cables.

This option is incorrect because UTP cables do not have shielding, which makes them more susceptible to electromagnetic interference (EMI) compared to Shielded Twisted Pair (STP) cables. STP cables have a layer of shielding that provides additional protection against EMI, making them more resistant to interference than UTP cables. Therefore, it is not true that UTP cables have a higher resistance to EMI than STP cables.

Important Information

To further understand the analysis, let’s evaluate the other options:

Option 2: They are commonly used in local area networks (LANs).

This option is true. UTP cables are indeed commonly used in local area networks (LANs) due to their cost-effectiveness, ease of installation, and adequate performance for short-distance communication needs.

Option 3: They are lighter and more flexible than STP cables.

This option is also true. UTP cables are lighter and more flexible than STP cables because they do not have the additional shielding layer present in STP cables. This makes UTP cables easier to handle and install.

Option 4: They are cost-effective for short-distance communication.

This option is true as well. UTP cables are cost-effective for short-distance communication because they are less expensive to produce and install compared to shielded cables. Their performance is sufficient for many short-distance networking applications, making them a popular choice.

Conclusion:

Understanding the characteristics of UTP and STP cables is essential for choosing the right type of cable for specific applications. UTP cables, while cost-effective and easy to install, are more susceptible to EMI compared to STP cables due to the lack of shielding. This makes them suitable for short-distance communication in environments with minimal EMI, such as local area networks (LANs). On the other hand, STP cables provide better protection against EMI and are preferable in environments with higher levels of electromagnetic interference.

• Mode 2 of the 8255A Programmable Peripheral Interface (PPI) is indeed the "Strobed Bidirectional Input / Output mode."
  • In this mode, Port A can be used for bidirectional handshake data transfer,
  • where data can be input or output on the same eight lines (PA0 - PA7).
• Additionally, pins PC3 - PC7 are used as handshake lines for Port A, facilitating the transfer of data under control signals.

So,  Port A can be used for bidirectional handshake data transfer in Mode 2 of the 8255A PPI.
Therefore, the correct option is : Mode 2

• The instrument control bus called 'IEEE-488 bus' is GPIB (General Purpose Interface Bus).
• USB (Universal Serial Bus) is commonly used for connecting peripheral devices like keyboards and flash drives to computers.
• PCI (Peripheral Component Interconnect) is an internal bus used for communication between components within a computer.
• Ethernet is a networking protocol used for connecting devices over a network.
• While all these buses are important for data transfer, GPIB (IEEE-488) is specifically designed for communication between instruments and controllers in laboratory or industrial settings.

• A Single Pole Double Throw (SPDT) switch is a switch that has only a single input and can connect to and switch between 2 outputs.
• This means it has one input terminal and two output terminals.

IMPORTANT:

• Generally, MC4 (Multi-contact 4 mm diameter pin) connector is used to connect a solar panel array either in series or parallel mode.
• MC4 connector is preferred because the loss of power is negligible and easy in the wiring of solar panel array.
• Other connectors like Ring lugs, pin lugs, and twisting of cables are not used to connect solar panel array because it suffers from environmental conditions like rain, not wave during summer, cold season, etc, and hence power loss occurs.

• The connector shown in the picture is called an XLR connector female where XLR stands for external line Return.
• It is used to connect low-voltage power supply equipment to an audio system, lighting control system, video system, etc.
• The design of the connector is generally circular in shape and have between 3-pins to 7-pins

Important Points:

• BNC (Bayonet Neill-councilman) connector is used for co-axial cable mainly, and it operates on radio frequencies. It is of two types called 50 Ω and 75 Ω BNC connector.
• TRS connector is a Jack connector used to connect earphones and headphones to mobile etc.
• RCA plug is a connector that is used to connect a TV system to a speaker or Audio system to mice etc.

• Generally, MC4 (Multi-contact 4 mm diameter pin) connector is used to connect a solar panel array either in series or parallel mode.
• MC4 connector is preferred because the loss of power is negligible and easy in the wiring of solar panel array.
• Other connectors like Ring lugs, pin lugs, and twisting of cables are not used to connect solar panel array because it suffers from environmental conditions like rain, not wave during summer, cold season, etc, and hence power loss occurs.

Explanation:

Unshielded Twisted Pair (UTP) Cables

Definition: Unshielded Twisted Pair (UTP) cables are a type of twisted pair cables that are commonly used for various telecommunications and networking applications. They consist of pairs of wires twisted together to reduce electromagnetic interference (EMI) from external sources and crosstalk between adjacent pairs within the cable.

Working Principle: UTP cables work by twisting the pairs of wires together, which helps to cancel out electromagnetic interference (EMI) from external sources and minimize crosstalk between the pairs. The twisting of the wires causes the magnetic fields generated by the current in each wire to cancel each other out, thus reducing the overall EMI.

Advantages:

• Cost-effective: UTP cables are generally less expensive than shielded cables, making them a popular choice for many networking applications.
• Ease of installation: UTP cables are lighter and more flexible, making them easier to install and handle compared to shielded cables.
• Widely used: UTP cables are commonly used in local area networks (LANs) and other telecommunications applications.

Disadvantages:

• Susceptibility to EMI: UTP cables do not have shielding, which makes them more susceptible to electromagnetic interference (EMI) compared to shielded cables.
• Limited distance: UTP cables are typically used for short-distance communication due to their susceptibility to EMI and signal attenuation over longer distances.

Applications: UTP cables are widely used in various applications, including local area networks (LANs), telephone systems, and other telecommunications infrastructure where cost and ease of installation are important considerations.

Correct Option Analysis:

The correct option is:

Option 1: They have a higher resistance to EMI than STP cables.

This option is incorrect because UTP cables do not have shielding, which makes them more susceptible to electromagnetic interference (EMI) compared to Shielded Twisted Pair (STP) cables. STP cables have a layer of shielding that provides additional protection against EMI, making them more resistant to interference than UTP cables. Therefore, it is not true that UTP cables have a higher resistance to EMI than STP cables.

Important Information

To further understand the analysis, let’s evaluate the other options:

Option 2: They are commonly used in local area networks (LANs).

This option is true. UTP cables are indeed commonly used in local area networks (LANs) due to their cost-effectiveness, ease of installation, and adequate performance for short-distance communication needs.

Option 3: They are lighter and more flexible than STP cables.

This option is also true. UTP cables are lighter and more flexible than STP cables because they do not have the additional shielding layer present in STP cables. This makes UTP cables easier to handle and install.

Option 4: They are cost-effective for short-distance communication.

This option is true as well. UTP cables are cost-effective for short-distance communication because they are less expensive to produce and install compared to shielded cables. Their performance is sufficient for many short-distance networking applications, making them a popular choice.

Conclusion:

Understanding the characteristics of UTP and STP cables is essential for choosing the right type of cable for specific applications. UTP cables, while cost-effective and easy to install, are more susceptible to EMI compared to STP cables due to the lack of shielding. This makes them suitable for short-distance communication in environments with minimal EMI, such as local area networks (LANs). On the other hand, STP cables provide better protection against EMI and are preferable in environments with higher levels of electromagnetic interference.

The unshielded twisted pair consists of two unshielded wires twisted around each other, it is used to carry high-frequency signals in telephone connections, LAN, etc.

• Earth Leakage Circuit Breaker (ELCB) works on the principle of residual current
• Current operated ELCBs are safer as they operate on the principle of the vector sum of the line currents and neutral current.
• It is used to provide protection against accident by rapidly interrupting dangerous contact voltage which may present in the faulty electrical equipment.

Straight-Tip connectors are most commonly used in connecting fiber optic cables to networking devices.

Subscriber channel (SC) – these are used in duplex connection using two fiber optic cables

• The connector shown in the picture is called an XLR connector female where XLR stands for external line Return.
• It is used to connect low-voltage power supply equipment to an audio system, lighting control system, video system, etc.
• The design of the connector is generally circular in shape and have between 3-pins to 7-pins

Important Points:

• BNC (Bayonet Neill-councilman) connector is used for co-axial cable mainly, and it operates on radio frequencies. It is of two types called 50 Ω and 75 Ω BNC connector.
• TRS connector is a Jack connector used to connect earphones and headphones to mobile etc.
• RCA plug is a connector that is used to connect a TV system to a speaker or Audio system to mice etc.

FTP connector - aluminum Foil - shielded Twisted Pair cable. This type of wire is connected using FTP connector

RCA connector - It is a two - wire connector known as Phono connector or A/V (Audio/Video) Jack.

BNC connector - British Naval Connector is an RF connector. It is used to connect a computer to coaxial cable, camera, microphone, and other electronic systems.

DB connector - DB connectors are D shaped connectors with a number of pins.

• Switches are used to make or break electric circuits.
• In circuits in Off condition the switch acts as open circuit stopping flow of current or in On condition it acts as short circuit allowing flow of current.

• Generally, MC4 (Multi-contact 4 mm diameter pin) connector is used to connect a solar panel array either in series or parallel mode.
• MC4 connector is preferred because the loss of power is negligible and easy in the wiring of solar panel array.
• Other connectors like Ring lugs, pin lugs, and twisting of cables are not used to connect solar panel array because it suffers from environmental conditions like rain, not wave during summer, cold season, etc, and hence power loss occurs.