Dual channel, Sensitivity Settings

Q. If the distance of screen from a CRT to centre of deflection plates is 20 cm. The length of deflection plate is 2 cm. The distance between the plates is 1 cm and the accelerating voltage is 500 V, the deflection sensitivity is ______ cm/V.

1. 0.4
2. 4
3. 0.04
4. 40

Q. The time/div and voltage/div axes of an oscilloscope have been erased. A student connects a 1 kHz, 5 V p-p square wave calibration pulse to channel 1 of the scope and observes the screen to be as shown in the upper trace of the figure. An unknown signal is connected to channel 2 (lower trace) of the scope. If the time/div and V/div on both channels are the same, the amplitude (p-p)and period of the unknown signal are respectively

1. 5 V, 1 ms
2. 5V, 2 ms
3. 7.5 V, 2 ms
4. 10 V, 1 ms

Q. The Deflection Sensitivity of a Cathode Ray Tube is

1. Directly proportional to the defleciton voltage
2. Directly proportional to the square of the deflection voltage
3. Inversely proportional to the deflection voltage
4. Independent of the deflection voltage

Q. In an oscilloscope screen, linear sweep is applied at the

1. vertical axis
2. horizontal axis
3. origin
4. both horizontal and vertical axis

Q. The horizontal deflection plates in a CRT are 20 mm long and 5 mm apart. The centre of the plate is 20 cm from the screen. Accelerating voltage is 2500 V. Then the deflection sensitivity is ______mm/V.
(Answer upto two decimal places)

1. 1.6
2. 0.16
3. 0.6
4. 16

Q. A CRO is operated in sweep mode. A time varying signal $s\left(t\right)=[5+100\sin 1000\pi t]$ is tested in AC coupling. The signal which will be displayed on screen while in AC coupling is

1. $5+100\sin 1000\pi t$
2. 5
3. $100\sin 1000\pi t$
4. $500\sin 1000\pi t$

Q. In an analog single channel cathode ray oscilloscope (CRO), the x and y sensitivity are set as 1 ms/div and 1 V/div respectively. The y-input is connected to a voltage signal $4cos(200\pi t-{45}^o)V.$ The trigger source is internal, level chosen is zero and the slope is positive. The display seen on the CRO screen is

1. 
2. 
3. 
4. 

Q. The x and y sensitivities of an analog oscilloscope are set as 2 ms/cm and 1 V/cm respectivley. The trigger is set at 0 V with negative slope. An input of $2cos(100\pi t+{30}^o)V$ is fed to the y input of the oscilloscope. The wave form seen on the oscilloscope will be

1. 
2. 
3. 
4. 

Q. A symmetrical square wave of frequency $25kHz$ and a peak-to-peak amplitude of $10V$ is fed to $Y-input$ of a single channel oscilloscope. The screen appears as shown in figure. Then the $XandY$ sensitivities and the trigger settings respectively are

1. $5\mu s/cm,2V/cmand+veslope$
2. $5\mu s/cm,2V/cmand-veslope$
3. $10\mu s/cm,1V/cmand+veslope$
4. $20\mu s/cm,2V/cmand-veslope$

Q.

Doppler effect would take place in case of

Q. The slope and level detector circuit in a CRO has a delay of 100 ns. The start-stop sweep generator has a response time of 50 ns. In order to display correctly, a delay line of

1. 150 ns has to be inserted into the y-channel.
2. 150 ns has to be inserted into the x-channel.
3. 150 ns has to be inserted into both x and y channels.
4. 100 ns has to be inserted into both x and y channels.

Q. The probes of a non-isolated, two channel oscilloscope are clipped to points A, B and C in the circuit of the adjacent figure. $V_{in}$ is a square wave of a suitable low frequency. The display on $C{h}_{1}andC{h}_2$ are as shown on the right. Then the 'Signal' and 'Ground' probes $S_1,G_{1}and{S}_2,G_{2}ofC{h}_{1}andC{h}_2$ respectively are connected to points:

1. A, B, C, A
2. A, B, C, B
3. C, B, A, B
4. B, A, B, C

Q. The figure shows a periodic waveform to be displayed on a CRO. A trigger setting which ensures a stationary display is

1. $level:0.2V,slope:-ve$
2. $level:0.5V,slope:-ve$
3. $level:0.3V,slope:+ve$
4. $level:1.8V,slope:-ve$

Q. A double beam CRO has a bandwidth of $10MHz$. Two signals
$V_1\left(t\right)=10sin(2\pi \times 20\times {10}^{3}t)$ and
$V_2\left(t\right)=10sin(2\pi \times 20\times {10}^{6}t)$ are applied to the two channels. If $P_{1}and{P}_2$ are the peak-to-peak values of the signals displayed, then

1. $P_1=20,P_2=20$
2. $P_1<20,P_2>20$
3. $P_1=20,P_2<20$
4. $P_1>20,P_2<20$

Q. A certain oscilloscope with 4 cm screen has its own sweep output fed to its input. If the $xandy$ sensitivities are same, the oscilloscope will display a

1. triangular wave
2. diagonal line
3. sine wave
4. circle

Q. A voltage of $6cos\left(100\pi t\right)V$ is fed as y - input to a CRO. The waveform seen on the screen of the CRO is shown in the figure. The Y and X axes settings for the CRO are respectively.

1. $1V/divand1ms/div$
2. $1V/divand2ms/div$
3. $2V/divand1ms/div$
4. $2V/divand2ms/div$

Q. The linear sweep for the time base in an oscilloscope has deviation from its nominal waveform. The nominal (dashed line) and actual (solid line) sweep waveforms are shown in the following figure.

A $5V$ p-p sine wave with a frequency of $1kHz$ will be measured on the oscilloscope as a sine wave with

1. $4.45V_{p-p}and1kHzfrequency$
2. $5V_{p-p}and1kHzfrequency$
3. $5V_{p-p}and1.1kHzfrequency$
4. $5V_{p-p}and1.15kHzfrequency$