The two beams could be produced by two independent electron gun assemblies, or by a single gun and a splitter plate to slice the beam in half. An oscilloscope using this type of dual-trace operation is known as a dual-beam oscilloscope.
The dual-beam CRO uses two complete separate electron beams. The dual-beam analog oscilloscope can display two signals simultaneously. A special dual-beam CRT generates and deflects two separate beams.
2. Two voltages can be studied simultaneously by making use of __________
Single-electron gun
Two electron guns
Four electron guns
Six electron guns
Answer.2. Two electron guns
Explanation:
The two beams could be produced by two independent electron gun assemblies, or by a single gun and a splitter plate to slice the beam in half. An oscilloscope using this type of dual-trace operation is known as a dual-beam oscilloscope.
The dual-beam CRO uses two complete separate electron beams. The dual-beam analog oscilloscope can display two signals simultaneously. A special dual-beam CRT generates and deflects two separate beams.
3. A dual-beam oscilloscope has __________
8 vertical deflection plates
6 vertical deflection plates
2 vertical deflection plates
4 vertical deflection plates
Answer.3. 2 vertical deflection plates
Explanation:
In dual-beam oscilloscopes, there are two vertical input signals.
In a dual-beam oscilloscope, a specially designed C.R.T. is used which is capable of producing two completely distinct electron beams so that they can be deflected independently in the vertical plane.
In the split beam technique, the single electron gun is split into two distinct beams mechanically. While in other techniques, two separate electron guns are used which produce their own beam.
Thus in dual beam, C.R.T. two sets of vertical deflection plates are used, one set for each channel but only one set of horizontal deflection plates. The simplified block diagram of dual-beam C.R.O.
4. In a dual-beam oscilloscope, the sweep generator is triggered by
Oscillator
Flip-flop
Transformer
Channel A or B
Answer.4. Channel A or B
Explanation:
The dual-beam oscilloscope has two vertical deflection plates and two separate channels A and B for the two separate input signals.
Each channel consists of a preamplifier and an attenuator. A delay line, main vertical amplifier, and a set of vertical deflection plates together form a single channel.
There is a single set of horizontal plates and a single time base circuit.
The horizontal deflection system consists of a sweep generator that drives a single set of horizontal deflection plates in the C.R.T. and sweeps both the vertical signals across the C.R.T. screen at the same rate.
The sweep generator can be triggered internally by the channel A signal or channel B signal.
As regards triggering of the sweep generator it can be done internally from either of channel or by the externally applied trigger or it can be triggered from the line voltage.
5. In Dual-beam oscilloscope can generate the two-electron beam by
Double Electron gun
Splitting Beam
Both 1 and 2
None of the above
Answer.3. Both 1 and 2
Explanation:
The dual-beam oscilloscope can generate the two-electron beams within the cathode ray tube either by using a double electron gun tube or by splitting the beam. In this method, the brightness and focus of each beam are controlled separately. But two tubes increase the size and weight of the oscilloscope and it looks bulky.
6. In a dual-beam oscilloscope horizontal deflection system consists of _______
Attenuator
Sweep Generator
Trigger
Amplifier
Answer.2. Sweep Generator
Explanation:
The horizontal deflection of the dual-beam oscilloscope system consists of a sweep generator that drives a single set of horizontal deflection plates in the C.R.T. and sweeps both the vertical signals across the C.R.T. screen at the same rate. As regards triggering of the sweep generator it can be done internally from either of channel or by an externally applied trigger or it can be triggered from the line voltage.
7. The Dual-beam Oscilloscope can measure the ______ waveform.
Amplitude
Frequency
Phase angle
All of the above
Answer.4. All of the above
Explanation:
The dual-beam oscilloscopes are widely used and are more versatile than the single beam type. They have the advantage that two waveforms can be displayed simultaneously. This enables waveforms to be compared, in terms of their amplitudes, shape, phase angle, or frequency.
8. The main Drawback of a Dual-beam oscilloscope is
Large size
Heavy-weight
Uneven Brightness
All of the above
Answer.4. All of the above
Explanation:
The dual-beam oscilloscope can generate the two-electron beams within the cathode ray tube either by using a double electron gun tube or by splitting beam. In this method, the brightness and focus of each beam are controlled separately. But two tubes increase the size and weight of the oscilloscope and it looks bulky.
Nowadays, double beam oscilloscope is outdated, as this function could be performed by the digital scope with greater efficiency and they do not require a dual-beam display. The digital scope captures a single beam of electrons and simultaneously splits into many channels.
In dual or double Beam Oscilloscope the two displays may have noticeably different brightness if operated at widely spaced sweep speeds. The brightness and focus control also affects the two traces at the same time.
9. In a multi-beam oscilloscope __________
A single beam is produced
Three beams are produced
Many beams are produced
Two beams are produced
Answer.3. Many beams are produced
Explanation:
A multiple-beam oscilloscope has a single tube but several beam-producing systems inside. Each system has a separate vertical deflecting pair of plates and generally a common time base system. The triggering can be done internally using either of the multiple inputs or externally by an external signal or line voltages.
10. The main difference between a dual-beam oscilloscope as compared to a dual-trace oscilloscope is
Two different Electron gun is used
Signals are displayed simultaneously
Signal must have sam frequency
All of the above
Answer.4. All of the above
Explanation:
Difference between Dual Beam and Dual Trace Oscilloscope
The dual-beam oscilloscope has two different electron gun which passes through two completely separate vertical channels, whereas a dual-trace oscilloscope has a single electron beam that gets split into two and passes through two separate channels.
Dual Trace
Dual Beam
One electron beam and one vertical amplifier are used to generate two traces.
Two electron beams and two vertical amplifiers are used.
Two signals are not displayed simultaneously in real-time but appear to be displayed simultaneously.
The two signals are displayed simultaneously.
A single beam is used to share between the two signals hence difficult to switch quickly between the traces.
Two beams are used hence easy to switch between the traces.
Two signals have different frequencies.
Two signals must have the same frequency or their frequencies must be integer multiple of each other.
Cannot operate at fast speeds because the two separate fast transient signals cannot be done.
It can operate at a very fast speed.
The cost is low due to the single beam.
The cost is more due to two beams.
Size and weight are less.
Size and weight are more as compared to dual trace oscilloscope.
