Table of Content  
4.1 Thermionic Emission and Cathode Ray
4.2 Carthode Ray Oscilloscope
4.3 Semiconductor
4.4 Semiconductor Diode
4.5 Trasistor
4.6 Logic Gate

Cathode Ray Oscilloscope

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Display on the screen of an oscilloscope 1) The diagram shows a trace on a cathode ray oscilloscope (CRO). Which of the following statement is true about the signal displayed and the setting of the CRO?
  1. This is an alternating current.
  2. The time base is off
  3. The voltage is 2V
Choice 1
I and II only
Choice 2
I and III only
Choice 3
II and III only
Choice 4 I, II and III


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Display on the screen of an oscilloscope

2) The diagram shows a trace on an oscilloscope. The Y-gain control of the cathode-ray oscilloscope is set to 5V/div. What is the root mean square voltage of the signal?

Choice 1
5.15V
Choice 2
7.07V
Choice 3
10.00V
Choice 4 20.00V


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Display on the screen of an oscilloscope3) The diagram shows a trace on an oscilloscope. The time-base of cathode-ray oscilloscope is set to 5 ms/div. What is the frequency of the signal?


Choice 1
25Hz
Choice 2
50Hz
Choice 3
100Hz
Choice 4 Can't be determined!


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Display on a CRO

4) Figure above shows a waveform of an alternating current on the screen of a cathode ray oscilloscope. The Y-gain control is set to 5V/div. Find the peak voltage of the alternating current.

Choice 1
3V
Choice 2
6V
Choice 3
15V
Choice 4 30V


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Structure of a CRO

5) Diagram above shows the internal structure of a cathode ray oscilloscope. Name the parts Q, R and S in the electron gun.


Q
R
S
Choice 1

Focusing Anode

Control Grid

Accelerating Anode

Choice 2

Control Grid

Accelerating Anode

Focusing Anode

Choice 3

Control Grid

Focusing Anode

Accelerating Anode

Choice 4

Cathode

Focusing Anode

Accelerating Anode



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6) Which part of the cathode ray oscilloscope controls the brightness of the light spot on the screen?

Choice 1
Control grid
Choice 2
Focusing anode
Choice 3
Deflecting plates
Choice 4 Accelerating anode


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7) Figure above shows a sonar signal recorded on a cathode ray oscilloscope (CRO) when it is emitted by a ship and reflected back by the seabed. Given that the time base of the CRO is set to 100ms/div, find the depth of the sea beneath the ship. (The speed of sonar wave in sea is 1500ms-1)

Choice 1
375m
Choice 2
500m
Choice 3
750m
Choice 4 1000m


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electromagnetism notes