Sensors

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Past Papers questions (Sensors (IX-C) )

Worksheet

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Worksheets (IX-C)

Topic(Sensors)

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Q.

A digital security camera was set up as shown in the diagram.

The digital CCTV camera is connected to a computer. The computer can make the camera move in any
direction by sending out digital signals. The computer system has a 400 gigabyte hard disk.

(a)What hardware is needed to inform the computer that the camera

__________________________________________________________________________[1]

(b)Why is the DAC needed?


__________________________________________________________________________[1]

(c) How could the computer use the camera to detect an intruder?



__________________________________________________________________________[1]

(d)Give two advantages of using digital cameras.

C) )

A digital security camera was set up as shown in the diagram.

The digital CCTV camera is connected to a computer. The computer can make the camera move in any
direction by sending out digital signals. The computer system has a 400 gigabyte hard disk.

What hardware is needed to inform the computer that the camera needs to move to capture an image?

__________________________________________________________________________[1]

__________________________________________________________________________[1]

e camera to detect an intruder?

__________________________________________________________________________[1]

advantages of using digital cameras.

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The digital CCTV camera is connected to a computer. The computer can make the camera move in any
direction by sending out digital signals. The computer system has a 400 gigabyte hard disk.

needs to move to capture an image?

__________________________________________________________________________[1]

__________________________________________________________________________[1]

__________________________________________________________________________[1]

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(e)Each image size is 400 kilobytes (0.4 gigabytes).

(i) How many images can be stored before the hard disk is full?

[1]

(ii) Once the hard disk is full, how can the system ensure that the stored images are not lost and new
images can be stored?

[1]

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​Discover new features in Lessons!
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Past Papers questions (Sensors (IX-C) )

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●data/input is compared to values in memory
●if temperature too low, signal sent to heater…
●if pressure too low, signal sent to valve…
●and heater turned on/valve opened
●use of DAC
●use of actuators
●monitoring/control system continues to loop indefinitely

c) 1 mark for each sensor + 1 mark for each related application

sensor

application

light

greenhouse environment
open/close automatic doors

Sound

burglar alarm
listening for sounds in pipes etc.

Infra red

burglar alarm
detecting people (e.g. entering a building)

Moisture

greenhouse environment
check if clothes dry in a drier

gas detection of gas leaks

pH

soil acidity in greenhouse

smoke in buildings for fire detection

Motion sensor/accelerometer

vibrations in machinery

Proximity

parking cars

7010/13/O/N/11/Q.12

(a) Any five points from:

●sensors send information to the computer
●converted to a digital signal by an ADC
●data compared to stored data (sound level) in computer memory
●if it is identified as a drip in the outer pipe ......
●...... a signal is sent out by the computer (to the actuators)
●use of DAC to convert signal to analogue
●actuator/motor used to close valve in the inner pipe
●message sent to screen in control room/alarm sounds [5]

(b) Any two points from:

●computer response is much faster than a human
●24/7 monitoring is possible/no breaks taken
●a human may miss “signs of leakage”/computer doesn’t get tired
●no/removes human errors (therefore safer)
●automatic graph/generation of a spreadsheet

7010/12/O/N/12/Q.13