ELECTRONIC DISPLAYS

In a CRT, what is the purpose of the phosphor coating?. To emit visible light when struck by electrons. To direct the beam. To generate heat.

What happens when all phosphors in a CRT pixel are excited equally?. White light is produced. No light is emitted. Only blue is visible.

What determines the resolution of an LCD?. Contrast ratio. Number of pixels. Size of the screen.

Which factor improves the sharpness of an LCD display?. Backlight size. Higher pixel density. Increased voltage.

What is used in LCDs to control each pixel individually?. Cathode grid. Thin film transistors (TFT). Phosphor layer.

What causes image distortion in CRTs near magnetic fields?. Beam deflection. Pixel failure. Voltage overload.

Which device is used to convert a digital signal for a CRT?. Digital to analogue converter. Oscillator. Digital memory buffer.

The glass screen in a CRT mainly serves to: Act as a lens. Provide colour. Protect the internal components.

Which display can produce deeper blacks?. Both equal. LCD. CRT.

What causes image burn-in on CRT screens?. Static images for prolonged periods. Magnetic fields. Low voltage.

Why are CRTs less suitable for portable devices?. They have better resolution. They use less voltage. They are bulky and power-hungry.

How is the image formed on an LCD?. By scanning beams. By manipulating liquid crystals. Using magnetic deflection.

What is the function of the control grid in a CRT?. To accelerate electrons. To control brightness. To produce colour.

Which of the following describes an advantage of active matrix LCD?. Heavier weight. Faster response time. Lower brightness.

Which voltage type is generally required by an LCD?. Low voltage DC. High voltage AC. Variable current.

In a CRT, how is the image maintained to prevent flickering?. By refreshing at a high frequency. By increasing voltage. Using magnetic shielding.

Which part of a CRT ensures the beam hits the screen at precise points?. Deflection system. Grid. Focus coil.

How is brightness controlled on an LCD screen?. By changing the screen size. By adjusting the backlight. Using an electron gun.

What is typically used to accelerate the electron beam in a CRT?. Anode. Cathode heater. Deflection plates.

Which component in a CRT directs the electron beam?. Control grid. Shadow mask. Deflection coils.

Which type of display is more compact and lightweight?. CRT. LCD. Oscilloscope.

What does a high persistence phosphor in a CRT help reduce?. Power consumption. Flickering. Brightness.

The X plates in a CRT are responsible for which movement?. Beam acceleration. Brightness adjustment. Horizontal movement of the beam.

What controls the electron beam focus in a CRT?. Deflection coils. Focusing anode. Cathode heater.

What is a disadvantage of CRTs compared to LCDs?. They are lighter. They produce brighter images. They consume more power.

Which display is less susceptible to magnetic interference?. Both are equally affected. CRT. LCD.

Which display type generally offers better viewing angles?. LCD. Neither. CRT.

The electron beam in a CRT moves in a raster pattern to: Focus the colour beams. Display one line. Create the full image.

The Y plates in a CRT control the beam in which direction?. Circular. Horizontal. Vertical.

How is image contrast adjusted in an LCD?. By adjusting the phosphor type. By changing the voltage across liquid crystals. By altering the frequency.