Deck 17: Range-Free Localization Techniques and Node Network Terminology

Question 1

Range-free localization trying to find _____________ values distances or angles.

A)exact
B)approximate
C)actual
D)none of these

Answer 1

approximate

Question 2

Following is the example of Range-Free Localization.

A)hop-based localization
B)point in triangle (pit)
C)both a and b
D)triangulation

Answer 2

both a and b

Question 3

Trilateration technique measures the _______to all anchors and Triangulation measures ________to all anchors,

A)angle, distance
B)angle, angle
C)distance, angle
D)distance, distance

Answer 3

distance, angle

Question 4

Hop Based Localization uses the ___________ to calculate the approximate distance to the anchor.

A)median hop length
B)mean hop length
C)minimum hop length
D)maximum hop length

Question 5

Node A and B 130 meters away and 5 hope separated. Node B and C 170 meters away and 6 hope separated and Node A and c 120 meters away and 5 hope separated. Then the mean hop length is___ meters.

A)24
B)28.3
C)26
D)26.1

Question 6

Node A and B 130 meters away and 5 hope separated and Node A and c 120 meters away and 5 hope separated. Then the mean hop length is___ meters.

A)24
B)25
C)26
D)50

Question 7

While testing whether a node is inside a triangle or outside by moving node under consideration in any direction. If it gets closer or further away from all three triangle corners, then it is ________ the triangle.

A)outside
B)inside
C)may outside or inside
D)cannot predict

Question 8

While testing whether a node is inside a triangle or outside by moving node under consideration in any direction. If it does not gets closer or further away from all the three triangle corners, then it is ________ the triangle.

A)outside
B)inside
C)may outside or inside
D)cannot predict

Question 9

The node in the network, which produces the required data and is able to send it out to other nodes in the network is called as

A)data source
B)data destination
C)data forwarder
D)data sink

Question 10

The node in the network, which requires the data and is able to receive it from other nodes in the network is called as

A)data source
B)data destination
C)data forwarder
D)data sink

Question 11

Any node in the network, which is able to receive it from another node and to send it further is called as

A)data source
B)data destination
C)data forwarder
D)data sink

Question 12

A dedicated node(s) in the network, which is the embedded destination of any data in this network is called as

A)data source
B)data destination
C)data forwarder
D)data sink

Question 13

Select the correct statement

A)a valid routing path may consists of infinite number of nodes but it does not contain loops.
B)a valid routing path consists of a finite number of nodes and it may contain loops.
C)a valid routing path consists of a finite number of nodes and it does not contain loops.
D)a valid routing path consists of a finite number of nodes and it contain loops.

Question 14

Select the incorrect statement.

A)while a normal data destination cannot change over time, the sink can.
B)a sink can be mobile and change its position.
C)sink may have additional broadband communication interface
D)the individual nodes on the path are called as hops.

Question 15

Select the incorrect statement.

A)while a normal data destination can change over time, the sink usually does not.
B)a sink cannot be mobile and change its position.
C)sink may have additional broadband communication interface
D)the individual nodes on the path are called as hops.

Question 16

___________ delivers the message to all nodes in the network. Single source and all destinations

A)full network broadcast
B)unicast
C)multicast
D)convergecast

Question 17

_____________ has one source and one destination, which could be any nodes in the network

A)full network broadcast
B)unicast
C)multicast
D)convergecast

Question 18

___________ has several destinations. There is a single source, but multiple destinations of the data.

A)full network broadcast
B)unicast
C)multicast
D)convergecast

Question 19

_____________ is special sensor networks and refers to the collection of data from all nodes to a dedicated sink.

A)full network broadcast
B)unicast
C)multicast
D)convergecast

Question 20

Select incorrect statement

A)hop corresponds to some distance in the network, thus more hops correspond to longer distance.
B)geographic proximity guarantee the availability or the shortness of a route to the destination.
C)number of hops from the destination is not available at all nodes.needs to be discovered
D)two protocols can use the same metric, but perform the routing differently and with different efficiency.

Question 21

Select incorrect statement

A)hop corresponds to some distance in the network, thus more hops correspond to longer distance.
B)geographic proximity does not guarantee the availability or the shortness of a route to the destination.
C)number of hops from the destination is always available at all nodes.
D)two protocols can use the same metric, but perform the routing differently and with different efficiency

Question 22

Select incorrect statement

A)hop corresponds to some distance in the network, thus more hops correspond to longer distance.
B)geographic proximity does not guarantee the availability or the shortness of a route to the destination.
C)number of hops from the destination is not available at all nodes.needs to be discovered
D)two protocols can use the same metric, perform the routing differently but has same efficiency.

Question 23

Which of the following measurement is based two signals with different velocities

A)time of arrival (toa)
B)one-way time of arrival
C)two-way time of arrival
D)time difference of arrival (tdoa)

Question 24

Which of the following is not a prohibitive factors for GPS in wireless sensor networks

A)power consumption
B)accuracy maximum up to 15 meters
C)cost and size
D)need for line of sight (los)

Question 25

In WSN messages travel multiple hops, so if it has a________ reliability on each link, then the probability of a message transiting the entire network would be _________.

A)high, high
B)high, low
C)low, low
D)low, high

Question 26

From 20 localization measurements, 19 were inside a radius of 15 meters around the true position, while 1 was outside. This results in an accuracy of 15 meters with a precision of __________.

A)0.05
B)0.05263157894736842
C)95%.
D)0.05.

Question 27

A _____________ is a tuple, containing all anchors which can be seen at this place and their signal strengths (RSSI or LQI).

A)footprint
B)path print
C)fingerprint
D)handprint

Question 28

Location mules are another interesting approach to proximity schemes, where

A)there are installed anchors with an on-board gps
B)a mobile node with an on-board gps
C)a mobile node without an on-board gps
D)there are installed anchors without an on-board gps

Question 29

From 20 localization measurements, 18 were inside a radius of 15 meters around the true position, while 2 was outside. This results in an accuracy of 15 meters with a precision of __________.

A)0.2
B)0.8
C)95%.
D)0.9