FIBRE OPTICS

Fibre bandwidth is mostly limited by: Cable diameter. Length of the cable. Wavelength type.

The acceptance angle of a fibre is defined by the: Cladding thickness. Core roughness. Numerical aperture.

Which of the following can cause scattering losses in fibre optic cables?. Surface coating thickness. Cladding impurities. Microscopic density variations.

A suitable connector for semi-permanent fibre optic joins is: Butt joint. Refraction clamp. Lens coupler.

What happens when two fibre optic cables are slightly misaligned but still transmit light?. Mode mismatch. Edge attenuation. End to end coupling.

Correct connection of a fibre optic connector involves: Slight pressure alignment. Reinforced clamp fitting. Torque spanner tightening.

To test signal transmission in a fibre optic cable, you would use: A signal generator. A light source and power meter. An ohmmeter.

An increase in the numerical aperture of an optical fibre leads to: Higher light gathering capacity. Decreased acceptance angle. Lower transmission speed.

Using single mode fibre helps eliminate: Chromatic spreading. Pulse echo. Modal dispersion.

In an optical fibre, chromatic dispersion depends on: The wavelength of transmitted light. Temperature variation. Connector alignment.

Why are single mode fibres suitable for long-distance telecoms?. They require no repeaters. They have low attenuation. They are easier to install.

What type of light modulation is typically used in fibre optic communication?. Frequency modulation. Intensity modulation. Pulse modulation.

What kind of light is commonly used in modern fibre optic systems?. Infrared. Ultraviolet. Visible blue.

Which optical phenomenon causes spreading of light pulses in fibre?. Reflection. Dispersion. Absorption.

Fibre optics rely primarily on: Light propagation. Voltage modulation. Signal rectification.

Why are fibre optic systems preferred in aircraft?. High voltage transmission. Weight savings. Ease of installation in metallic frames.

Modal dispersion increases with: Wavelength uniformity. Reduced core diameter. Multiple transmission paths.

Common light sources for fibre optic transmission include: Incandescent lamp. SLED or laser diode. Filament bulb.

What is true about passive optical sensors?. They convert optical signals into electrical signals. They require external power. They do not need power or process signals.

Why are fibre optics considered secure for data transmission?. They require signal boosters. They scramble light pulses automatically. They do not radiate electromagnetic signals.

Which characteristic defines a good quality optical fibre?. High core temperature resistance. Thick outer sheath. High numerical aperture and low attenuation.

A fibre optic data bus allows: Limited data rate. Multiple simultaneous transmissions. High-voltage signal transfer.

Which fibre type supports the longest transmission distances?. Single mode fibre. Plastic optical fibre. Multimode graded index.

What common issue affects the performance of fibre optic connectors during maintenance?. Contamination and improper alignment. Oxidation of contact points. Insulation cracking.

Fibre optics carry light by the principle of: External focusing. Total internal reflection. Refraction.

Typical attenuation in fibre optics is: 10 dB to 50 dB per km. More than 25 dB per km. Less than 2 dB per km.

A fibre optic star topology ensures: Looped redundancy network. Shared bandwidth among nodes. Direct line communication between hub and each device.

Why is fibre optic transmission more efficient than electrical wire?. Higher frequency range. Less attenuation. Lower insulation needs.

Compared to copper cables, fibre optics offer: Higher resistive losses. Immunity to electromagnetic interference. Lower cost installation.

Multimode fibre differs from single mode in that it: Has lower bandwidth. Supports multiple propagation paths. Uses higher wavelengths.

One key benefit of fibre optics is: Minimal signal degradation over long distances. Built-in signal amplification. Increased mechanical load capacity.