Electrical Systems Quiz

What is a sub-main in electrical systems?

• A cable used for distributing electricity from a main intake position to a sub-section of the installation

• A type of intelligent system used to control heating, ventilation, and air conditioning in buildings

• A system installed to provide emergency lighting in case of power failure

• A security system used to prevent unlawful entry

Answer explanation

A sub-main in electrical systems refers to a cable that is responsible for distributing electricity from the main intake position to a sub-section of the installation. This cable plays a crucial role in ensuring that power is properly distributed throughout the system, allowing for efficient and reliable operation.

What type of cables are commonly used for sub-mains?

• PVCSWA or XLPE

• MICC, Firetuf or FP400

• Cat 5 onward

• Proximity switches, detectors, and sounders

Answer explanation

The question asks about the type of cables commonly used for sub-mains. The correct answer is PVCSWA or XLPE. These are types of cables that are designed to handle the high power requirements of sub-mains. Other options like MICC, Firetuf or FP400, Cat 5 onward, and Proximity switches, detectors, and sounders are not typically used for this purpose.

The purpose of environmental control/building energy management systems is (a)   .

• To control all aspects of heating,
• To provide a sufficient light level
• To protect life and property from f
• To prevent unlawful entry into a bu

What are the three types of emergency lighting systems?

• Maintained, non-maintained, and sustained

• Manual, automatic for the protection of life, and automatic for the protection of property

• Control panels, proximity switches, and detectors

• Standalone units, wired or wireless, and domestic or sophisticated multi-camera/screen

What standard are fire alarm systems installed to?

• BS 5839

• BS 5266

• BS EN 50131

• BS 4737

Answer explanation

The correct answer is BS 5839. This is the British Standard to which fire alarm systems are installed. The other options, BS 5266, BS EN 50131, and BS 4737, are standards for emergency lighting, alarm systems, and intruder alarm systems respectively, not for fire alarm systems.

What is the purpose of intruder alarms?

• To provide continuous power supply to equipment

• To control heating, water heating, and central heating

• To prevent unlawful entry into a building

• To transmit data and communication signals

(a)   provide continuous power supply to equipment.

• UPS systems

• Control machine operations with PLC

• Monitor and record closed circuit T

• Control heating in buildings

Answer explanation

The question asks what provides continuous power supply to equipment. The correct answer is 'UPS systems'. UPS stands for Uninterruptible Power Supply, and its main function is to provide a continuous power supply in case of power failures or fluctuations, ensuring the smooth operation of equipment.

What type of transmission cabling is used for data transmission systems?

• PVCSWA or XLPE

• MICC, Firetuf or FP400

• Cat 5 onward

• Proximity switches, detectors, and sounders

Answer explanation

The question asks about the type of transmission cabling used in data transmission systems. The correct answer is 'Cat 5 onward'. This is because Category 5 (Cat 5) and its improved versions (like Cat 5e, Cat 6, etc.) are types of twisted pair cable for Ethernet and other network physical layers that is backward compatible with earlier cabling standards such as Cat 3.

What is the purpose of machine control systems?

• To distribute electricity from a main intake position to a sub-section of the installation

• To control all aspects of heating, ventilation, and air conditioning for buildings

• To provide emergency lighting in case of power failure

• To control large loads and electronic starters in machines

Answer explanation

The purpose of machine control systems is to control large loads and electronic starters in machines. This is essential for managing the operation of various machines and ensuring their efficient performance. The other options, such as distributing electricity, controlling HVAC systems, or providing emergency lighting, are not the primary purposes of machine control systems.

What are the key controls in heating systems?

• Control panels, proximity switches, and detectors

• Programmers and thermostats

• Control panels and sounders

• Detectors such as passive infrared, microwave, and photobeams

Answer explanation

The key controls in heating systems are programmers and thermostats. Programmers allow you to set 'on' and 'off' time periods to suit your own needs and thermostats regulate the temperature of the heating system. Other options like control panels, proximity switches, detectors, and sounders are not typically key controls in heating systems.