Question 1

___________allows the same time or frequency division multiplexing to be reused across non overlapping clusters

Accepted Answer

Clustering allows the same time or frequency division multiplexing to be reused across non-overlapping clusters, optimizing the use of the spectrum by reducing interference.

Question 2

The more capable nodes can naturally play the role of __________

Accepted Answer

The term "cluster head" is commonly used to describe the more capable nodes within a network that take on leadership or coordination roles.

Question 3

__________are nodes that aid in passing traffic from one cluster to another

Accepted Answer

Gateways are nodes that facilitate the transfer of data between different networks or clusters.

Question 4

In wireless sensor network

Accepted Answer

In wireless sensor networks, there are no special master clocks to synchronize the entire network, connections can be temporary and may change frequently due to the nature of wireless communication, and communication delays can indeed be inconsistent and unpredictable due to varying signal strengths, interference, and changing environmental conditions. Therefore, all of the statements A, B, and C accurately describe characteristics of wireless sensor networks.

Question 5

In wireless sensor network

Accepted Answer

In wireless sensor networks, communication delays can be inconsistent and unpredictable due to various factors such as interference, multi-path fading, and the dynamic nature of the network topology. Therefore, it is not accurate to say that communication delays are consistent and predictable. Additionally, wireless sensor networks typically do not have special master clocks for synchronization purposes; instead, they may rely on protocols designed to achieve time synchronization among the nodes.

Question 6

Time difference caused by the lack of a common time origin are referred to as___________

Accepted Answer

Time differences caused by the lack of a common time origin can be referred to as both clock phase difference and clock bias.

Question 7

Drawbacks of GPS to use in WSN node is

Accepted Answer

GPS receivers are difficult to incorporate into every sensor node due to their cost, power consumption, and large form factors. Additionally, GPS systems do not work well indoors, under dense foliage, or in other obstructed conditions, making them less reliable for certain WSN (Wireless Sensor Network) applications.

Question 8

_____sensor can be tasked to look for animals of a particular size and color. _____sensor can be tasked to detect the presence of a particular type of vehicle

Accepted Answer

A camera sensor can be used to identify animals based on size and color, while an acoustic sensor can detect vehicles by analyzing sound patterns.

Question 9

select the correct statement

Accepted Answer

Both statements A and B correctly describe aspects of sensor systems and information-based sensor tasking. Statement A highlights the goal of sensor systems to gather comprehensive and detailed information about unknown aspects of the environment. Statement B explains that information-based sensor tasking involves making decisions on which sensors to use based on the value of the information they can provide, while also considering various constraints such as resource consumption and latency.

Question 10

In __________sensor network systems, we must balance the information contribution of individual sensors against the cost of communicating with them

Accepted Answer

The answer of In __________sensor network systems, we must balance...

Question 11

From a data storage point of view ,one may think of a sensor network as a distributed database that

Accepted Answer

A sensor network indeed acts as a distributed database by collecting physical measurements (like temperature, humidity, etc.), indexing these measurements for efficient retrieval, and serving queries from both external and internal users or applications. This makes it a comprehensive system for data handling and retrieval, embodying all the mentioned functionalities.

Question 12

In__________ database systems, data storage may be allocated among several geographical separated locations, connected by a communications network

Accepted Answer

Distributed database systems are characterized by data storage across multiple geographical locations, interconnected through a communications network. This setup allows for data to be stored on multiple servers located in different places, enhancing accessibility, reliability, and efficiency.

Question 13

Each sensor in a sensor network takes___________ measurements of physical phenomena such as heat, sound, light ,pressure or motion

Accepted Answer

The answer of Each sensor in a sensor network takes___________...

Question 14

The challenge in sensor network databases is/ are

Accepted Answer

The challenge in sensor network databases includes the system's high volatility, the dynamic nature of relational tables due to continuous data sensing, and the high energy cost of communication which encourages in-network processing during query execution. All these factors contribute to the complexity of managing and querying sensor network databases.

Question 15

The challenges in sensor network databases
A: limited storage on nodes and high communication costs imply that older data has to be discarded
B: sensor tasking interacts in numerous ways with the sensor database system

Accepted Answer

Both statements A and B accurately describe challenges in sensor network databases. A highlights the limitations in storage and the high costs of communication, which necessitate the discarding of older data. B points out the complex interactions between sensor tasking and the sensor database system, which can affect performance and efficiency.

Question 16

The size of wireless sensor system is limited mostly by
A: the cost of maintaining communication links
B: the cost of sensor hardware

Accepted Answer

The size of a wireless sensor system is limited by both the cost of maintaining communication links and the cost of sensor hardware. Maintaining communication links can be expensive due to the energy required for data transmission over distances, and the cost of sensor hardware can also be a significant factor, especially for large-scale deployments.

Question 17

Following are application areas of wireless sensor network
A: asset and warehouse management
B: automotive
C: building monitoring and control
D: environmental monitoring

Accepted Answer

Wireless sensor networks are versatile and can be used in various applications including asset and warehouse management, automotive, building monitoring and control, and environmental monitoring.

Question 18

Following are application areas of wireless sensor networks
A: health care
B: industrial process control
C: military battlefield awareness
D: security and surveillance

Accepted Answer

Wireless sensor networks are versatile and can be used in various fields including health care (for patient monitoring), industrial process control (to monitor and control machinery and processes), military battlefield awareness (for surveillance and reconnaissance), and security and surveillance (to monitor secure areas or for intrusion detection).

Question 19

Sensors may be used
A: to monitor and track assets such as trucks or other equipment
B: to manage assets for industries such as oil and gas, utility , and aerospace

Accepted Answer

Sensors are widely used in various industries, including oil and gas, utility, and aerospace, for asset management and tracking purposes, such as monitoring the location and condition of trucks or other equipment.

Question 20

Sensors can be used
A: to monitor conditions and movements of wild animals or plants in wildlife habitats
B: to monitor air quality and track environmental pollutants, wildfires or other natural or manmade disasters
C: to monitor biological or chemical hazards to provide early warnings
D: to monitor earthquake

Accepted Answer

Sensors can be used in a wide range of applications including monitoring wildlife habitats, tracking environmental conditions like air quality and pollutants, providing early warnings for biological or chemical hazards, and monitoring natural phenomena such as earthquakes.

Quiz 3: Wireless Sensor Network Applications and Challenges

___________allows the same time or frequency division multiplexing to be reused across non overlapping clusters

The more capable nodes can naturally play the role of __________

__________are nodes that aid in passing traffic from one cluster to another

In wireless sensor network

In wireless sensor network

Time difference caused by the lack of a common time origin are referred to as___________

Drawbacks of GPS to use in WSN node is

_sensor can be tasked to look for animals of a particular size and color. _sensor can be tasked to detect the presence of a particular type of vehicle

select the correct statement

In __________sensor network systems, we must balance the information contribution of individual sensors against the cost of communicating with them

From a data storage point of view ,one may think of a sensor network as a distributed database that

In__________ database systems, data storage may be allocated among several geographical separated locations, connected by a communications network

Each sensor in a sensor network takes___________ measurements of physical phenomena such as heat, sound, light ,pressure or motion

The challenge in sensor network databases is/ are

The challenges in sensor network databases A: limited storage on nodes and high communication costs imply that older data has to be discarded B: sensor tasking interacts in numerous ways with the sensor database system

The size of wireless sensor system is limited mostly by A: the cost of maintaining communication links B: the cost of sensor hardware

Following are application areas of wireless sensor network A: asset and warehouse management B: automotive C: building monitoring and control D: environmental monitoring

Following are application areas of wireless sensor networks A: health care B: industrial process control C: military battlefield awareness D: security and surveillance

Sensors may be used A: to monitor and track assets such as trucks or other equipment B: to manage assets for industries such as oil and gas, utility , and aerospace