Building Utilities 08

Teflon is the correct answer because it is a type of plastic that was developed in 1938 by DuPont. It is known for being white, soft, waxy, and non-adhesive. Teflon is made from the polymer of tetrafluoroethylene, which gives it its unique properties.

The statement "Wooden septic tanks are allowed" is not true. Wooden septic tanks are not allowed as they are not durable and can deteriorate over time.

The correct answer is "Weighing Device". In an elevator, a weighing device is used to determine the weight of the passengers and objects inside the car. When the car becomes overloaded, meaning it exceeds the maximum weight capacity, the weighing device triggers the buzzer alarm to alert the passengers and operators. The door remains open until the overloading is eliminated by removing some of the weight from the elevator car.

A tungsten halogen lamp produces light by the reaction of a halogen additive in the bulb with tungsten. This reaction helps to recycle the tungsten, preventing it from evaporating and depositing on the inside of the bulb, which would cause the bulb to darken and reduce its lifespan. The halogen additive helps to redeposit the tungsten back onto the filament, extending the life of the bulb. This type of lamp is commonly used in applications where a bright, white light is needed, such as in photography or stage lighting.

Limit switches are devices used in elevators to prevent excessive travel of the car at the highest and lowest floors. They are designed to activate when the elevator reaches a specific point in its travel, signaling the control system to stop the car. This helps to ensure the safety of passengers and prevent any damage to the elevator system. Circuit breakers, handrail guard switches, and disconnect switches are not specifically designed for this purpose and do not provide the same level of protection against excessive travel.

The correct answer is Mechanical Maintenance Locking Device. This device is provided at the drive unit location in escalators to prevent accidental movement of the escalator during inspections or maintenance. It ensures the safety of maintenance personnel by securely locking the escalator in place.

A safety shoe is a device that is used in elevators to detect obstacles during the door closing process. It works in conjunction with a photocell to ensure that if there is something in the way of the closing doors, they will reopen to prevent any potential accidents or injuries. The safety shoe is an important component of elevator safety systems and helps to protect passengers and objects from being caught in the closing doors.

Handrail Guard Switches are designed to stop the escalator if a foreign object becomes wedged at the guard. These switches are specifically installed to ensure the safety of passengers by preventing any accidents or injuries that may occur due to objects getting stuck in the handrail guard. When the switches detect an obstruction, they immediately stop the escalator, preventing any further movement and potential harm.

Frequency refers to the number of cycles or oscillations that occur in a wave per unit time. It is measured in hertz, which represents the number of cycles per second. In other words, frequency determines how many complete waves pass a given point in a specific time period. It is a fundamental property of waves and is used to describe various types of waves, including sound waves and sine waves.

Passive Infrared with Ultrasonic (or Microwave) is the correct answer because this type of perimeter detector combines the use of both Passive Infrared (PIR) and Ultrasonic or Microwave systems. The Passive Infrared system detects changes in infrared radiation, such as body heat, while the Ultrasonic or Microwave system uses sound waves or electromagnetic waves to detect movement. By combining these two systems, the detector can provide more accurate and reliable detection of perimeter breaches.

A circuit breaker is a device that automatically interrupts the flow of electric current in a circuit when it detects an overload or a short circuit. In an elevator, a circuit breaker is used to protect the equipment from over current, which can be caused by excessive load or a fault in the electrical system. When the current exceeds a certain threshold, the circuit breaker trips and opens the circuit, preventing damage to the equipment and ensuring the safety of the elevator and its passengers.

Mercury lamps are a type of lamp that is commonly used for lighting commercial interiors. These lamps use argon gas to facilitate the starting process. Once started, they produce light through an electric discharge in mercury vapor.

The cooling effect obtained when 1 ton of ice at 32 oF (0 oC) melts to water at the same temperature in 24 hrs is referred to as "Ton of Refrigeration." This term is used to measure the cooling capacity of a refrigeration system. It represents the amount of heat that needs to be removed in order to convert one ton of ice into water at the same temperature in a 24-hour period.

The correct answer is "Moisture and Heat Resistant- Cross-Linked Thermosetting". This is because the acronym "XHHN" in wire specification stands for a wire that is both moisture and heat resistant, and is made of cross-linked thermosetting material.

A proximity/capacitance perimeter detector is able to detect intrusion by detecting a change in capacitance in the area it covers. When an intruder enters the area, the capacitance changes, triggering the detector. This type of detector does not rely on microwave or ultrasonic technology, but rather on changes in capacitance.

A metal halide lamp is a type of high intensity discharge lamp that produces light through the radiation of a mixture of metallic vapor. This type of lamp is similar in construction to a mercury lamp, but the metallic vapor used in a metal halide lamp is different. Metal halide lamps are known for their high light output, efficient energy usage, and long lifespan. They are commonly used in outdoor lighting, stadium lighting, and aquarium lighting.

A current overload safety switch is a device in escalators that is designed to automatically stop the escalator if an abnormal current is supplied to the motor. This switch acts as a safety measure to prevent damage to the motor or any other components of the escalator due to excessive current flow. When the switch detects an abnormal current, it interrupts the power supply to the motor, causing the escalator to stop and prevent any further damage or accidents.

The correct answer is "Moisture Resistant Cross-Linked Thermosetting." This means that the electrical wire is designed to withstand moisture in both wet and dry locations. The wire is made from a cross-linked thermosetting material that provides additional resistance to moisture. This ensures that the wire remains safe and functional even in environments where there is a potential for moisture exposure.

The disconnect switch is located at the bottom truss of the escalator and is used to stop or prevent the escalator from starting during maintenance service. It has on and off positions, allowing the escalator to be easily disconnected from its power source when necessary. This ensures the safety of maintenance workers and prevents any accidental start-up of the escalator while maintenance is being performed.

Transmission loss refers to the number of decibels by which sound is reduced when it passes through a partition. It is a measure of the sound insulation value of the partition, with a higher number indicating greater insulation.

The statement "3" diameter is 'not' a commercial size of G.I. Pipe for water supply" is not true because 3" diameter is indeed a commercial size of G.I. Pipe for water supply.

The collection line of a plumbing system is sometimes referred to as the "House Drain." This term is used to describe the pipe or pipes that collect wastewater from various fixtures within a house and carry it to the main sewer line or septic system. The house drain is an essential component of the plumbing system as it ensures the proper disposal of wastewater and prevents any potential backups or clogs.

A sheave is a component of an assembly that consists of a pulley wheel, side plates, shaft, and bearings over which a cable or rope is passed. It is used to change the direction or transmit power in a system.

A knife switch is a type of switch that is used to cut off the current supply to a device or equipment. It is commonly used for inspection, maintenance, or repairs, as it provides a quick and easy way to disconnect the power source. In the context of the given question, a knife switch would be the most suitable option as it allows for the complete cutoff of current supply to the escalator for inspection, maintenance, or repairs.

An air terminal is the correct answer because it refers to the combination of a metal rod and its brace or footing that is installed on the upper part of a structure as part of a lightning protection system. The air terminal is designed to attract and capture lightning strikes, providing a path for the electrical current to safely travel into the ground, thus protecting the structure from damage.

Microwave detectors are a type of perimeter detector that use radio waves to detect movement. However, they are subject to false alarms from aircraft radar and movement outside the building through windows, wood doors, and similar objects. This means that the microwave detectors can be triggered by these external factors, leading to false alarms.