Cathode Ray Oscilloscope-CRO MCQ

31. The purpose of SYNC control in a CRO is to

1. Foucus the spot on the screen
2. Lock the display of signal
3. Set the intensity of spot
4. Adjust the amplitude of display

32. The vertical gain control of CRO is set at a deilection sensitivity of 5 V/cm. An unknown sinusoidal is applied to Y-input. A 20 cm long straight line trace is observed, what will the ac voltage be?

1. 17.677 V
2. 35.35 V
3. 100 V
4. 70.71 V

33. In CRT, the secondary electons are collected by a conductive coating aquadag which is made up of

1. Hydrazine solution
2. Zirconium solution
3. Graphite solution
4. Rubber

34. A Lissajous pattern on an oscilloscope has 5 horizontal tangencies and 2 vertical tangencies. The frequency of the horizontal input is 1000 Hz. What is the frequency of the vertical input?

1. 5000 Hz
2. 400 Hz
3. 2500 Hz
4. 4000 Hz

35. The sweep generator of a CRO is used to produce

1. sinusoidal voltage for the vertical deflection of electron beam
2. saw tooth voltage for the horizontal deflection of electron beam
3. saw tooth voltage for the vertical deflection of electron beam
4. sinusoidal voltage for the horizontal deflection of electron beam

36. In a CRO, when set for internal trigger

1. trigger circuit input will vertical amplifier
2. trigger circuit receive input from the horizontal amplifier
3. trigger circuit receives input from the horizontal amplifier
4. trigger circuit receives input from the vertical amplifier