Robotic SENSORS (REC UNIT 4) CPAS Review

Question 1

What does the following symbol represent on the VEX controller configuration dialog?

Accepted Answer

digital input

Question 2

Sea level speed of sound is about 1100 ft/sec. Time between the lightning and sound of thunder is 5 sec. The storm is:

Accepted Answer

5500 feet away

Question 3

To make a wheel encoder more accurate, you should use one that:

Accepted Answer

Has the most ticks as possible

Question 4

Most garage doors utilize a(n) ________ to tell the controller when the door is fully open.

Accepted Answer

limit switch

Question 5

Speed of sound is 1000m/sec and echo takes 250ms to ping to the reception, what is distance?

Accepted Answer

125 meters

Question 6

The digital sensors contained with the VEX kit are two _______ and two ________

Accepted Answer

Bumper switches , limit switches

Question 7

Which of the following is NOT an example of a sensor?

Accepted Answer

Door opener

Question 8

Which sensor detects rotation?

Accepted Answer

Wheel encoder

Question 9

Sensors provide information to the robot concerning

Accepted Answer

all of the above

Question 10

Open loop systems:

Accepted Answer

Do not gather information and do not offer feedback

Question 11

In general, sensors provide ______ to a program via the controller.

Accepted Answer

feedback

Question 12

A(n) ______ uses a disk with pie shaped wedges and optical sensor to measure distance.

Accepted Answer

encoder

Question 13

An autonomous robot ____________.

Accepted Answer

uses sensors to provide feedback

Question 14

All robots have the capabilities identified below. Which one must the robot perform first?

Accepted Answer

Sensing

Question 15

If the speed of a sonar ping in water is 1500 m/sec and a ping takes 500 ms to return to a sub

Accepted Answer

375 m

Question 16

The GPS in your car uses a process called localization. What does this mean?

Accepted Answer

Correction of accumulated errors

Question 17

Which of these is NOT TRUE of the ultrasonic sensor?

Accepted Answer

It returns multiple distances when there r multiple targets

Question 18

Compared to a mountain top, sound travels ________at sea level.

Accepted Answer

slower

Question 19

If the speed of a sonar ping in water is 1500 feet/sec and a ping takes 8000 ms to return to a sub

Accepted Answer

2000 yards

Question 20

The line-following sensor is designed to operate:

Accepted Answer

About 1/8" to 1/4" above the line parallel to the floor

Question 21

What is localization

Accepted Answer

The correction of accumulated errors

Question 22

Which factor does NOT affect the speed of sound?

Accepted Answer

The sound amplitude (loudness) and frequency.

Question 23

The bumper switches and limit switches can be:

Accepted Answer

All Answers are correct

Question 24

The VEX Ultrasonic Sensor is connected to:

Accepted Answer

A digital output and an interrupt port.

Question 25

A system such as the one pictured below which uses operator control to move hazardous materials

Accepted Answer

is an example of an open loop control system.

Question 26

_______ sensors have the ability to return a(n) ________ of values.

Accepted Answer

digital, binary set, analog, range

Question 27

Digital sensors _______________.

Accepted Answer

can be only ON or OFF

Question 28

All Mars Rovers have needed autonomous driving functions because:

Accepted Answer

radio signals can take up to 20 minutes to get to Mars

Question 29

What does and accelerometer measure?

Accepted Answer

rate of change of velocity

Question 30

When should a sensor be sampled:

Accepted Answer

Immediately before the program needs to make a decision

Question 31

All autonomous robots have the following capabilities; which one must the robot perform first?

Accepted Answer

Sensing

Question 32

________ is an example of an analog sensor

Accepted Answer

An ultrasonic range finder

Question 33

Speed of sound is about 1100 ft/sec. You shout in the canyon & your echo returns in 6000ms. How far is the canyon wall?

Accepted Answer

3300 feet

Question 34

An example of a sensor that uses absolute positioning is:

Accepted Answer

GPS

Question 35

Which of the following statements is true of the line-following sensor?

Accepted Answer

Uses an LED and a photo detector to see the line.

Question 36

Suppose you found that your line-following reads 50 off the line and 100 on the line.

Accepted Answer

75 would be a good threshold value

Question 37

Closed loop systems:

Accepted Answer

Rely on information from the physical environment

Question 38

Which factor DOES NOT affect the speed of sound?

Accepted Answer

The sound amplitude (loudness and frequency

Question 39

What is a good practical application for a bumper switch

Accepted Answer

A small robot such as a roomba

Question 40

A(n) _______ is a sensor that reports the rate of change in the speed of a moving object.

Accepted Answer

accelerometer

Question 41

According to Intelitek, what is a robot?

Accepted Answer

A machine that responds to changes in the environment

Question 42

Sea level speed of sound is about 1100 ft/sec. Time between the lightning and sound of thunder is 10 sec. The storm is:

Accepted Answer

Just over 2 miles away

Question 43

What does and accelerometer measure?

Accepted Answer

rate of change of velocity

Robotic SENSORS (REC UNIT 4) CPAS Review

Questions 43

Robotic SENSORS (REC UNIT 4) CPAS Review

Questions 43