Bissoy.com
Doctors Medicines MCQs Q&A

An individual wire is labeled for insulation made of synthetic polymer, high heat resistance and has nylon coating for resistance to gasoline. What will be the label on the wires?

An individual wire is labeled for insulation made of synthetic polymer, high heat resistance and has nylon coating for resistance to gasoline. What will be the label on the wires? Correct Answer XHHN

Wire lettering:

The letters THHN, XHHN, THN, and XTHN represent the main insulation types of individual wires. These letters depict the following NEC requirements

  • T - Thermoplastic insulation
  • H - Heat resistant
  • HH - High heat resistant (up to 1940 F)
  • W - Suitable for wet locations
  • N - Nylon coating, resistant to damage by oil or gas
  • X - Synthetic polymer (flame resistant)

 

XHHN (synthetic polymer high heat resistant nylon coated) wire:

  • It is mainly used for residential, commercial, and industrial buildings, it is also used in raceways, feeders, and circuit wiring.
  • In this copper or aluminum is used as a conductor.
  • And the wire is Solid or stranded cable.

 

THHN ( Thermoplastic high heat resistant nylon coated ):

  • The most popular type of building wire that is used in construction is THHN wire. It is also commonly used in machine tools, control circuits.
  • In this also as a conductor material, copper or aluminum is used.
  • These are either stranded or solid depending upon the size of conductors.
  • PVC insulation with a nylon jacket is used.

Related Questions

Which of the following statements is/are correct? 1. A fuse wire is made of 37% lead and 63% tin 2. A fuse wire is made of 63% lead and 37% tin 3. A fuse wire has high resistance and low melting point 4. A fuse wire has low resistance and high melting point
A telephone switchboard 100 pair cable can be made up with either enameled wire or tinned wire. There will be 400 soldered connections. The cost of soldering a connection on the enameled wire will be P 1.65 on the tinned wire, it will be P 1.15. A 100- pair cable made up with enameled wire cost P 0.55 per linear foot and those made up of tinned wire cost P 0.75 per linear foot. Determine the length of cable run in feet so that the cost of each installation would be the same.
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes
Read the following passage and answer the item that follows. Your answers to this item should be based on the passage only. Many farmers use synthetic pesticides to kill infesting insects. The consumption of pesticides in some of the developed countries is touching 3000 grams/hectare. Unfortunately, there are reports that these compounds possess inherent toxicities that endanger the health of the farm operators, consumers and the environment. Synthetic pesticides are generally persistent in environment. Entering in food chain they destroy the microbial diversity and cause ecological imbalance. Their indiscriminate use has resulted in development of resistance among insects to insecticides, upsetting of balance in nature and resources of treated populations. Natural pest control using the botanical pesticides is safer to the user and the environment because they break down into harmless compounds within hours or days in the presence of sunlight. Plants with pesticidal properties have been in nature for millions of years without any ill or adverse effects on the ecosystem. They are easily decomposed by many microbes common in most soils. They help in the maintenance of biological diversity of predators and human health hazards. Botanical pesticides formulated from plants are biodegradable and their use in crop protection is a practical sustainable alternative. On the basis of the above passage, the following assumptions have been made: 1. Synthetic pesticides should never be used in modern agriculture. 2. One of the aims of sustainable agriculture is to ensure minimal ecological imbalance. 3. Botanical pesticides are more effective as compared to synthetic pesticides. Which of the assumptions given above is/are correct?
When the main switch of the house is put off it disconnects the: (A) Live wire only (B) Live wire and the earth wire (C) Live wire and the neutral wire (D) Earth wire and the neutral wire
An elevator is assembled to raise equipment to a height of 22m. It is estimated that maximum weight of the material to be raised is 4.9kN. It is observed acceleration in such cases is 1.2m/s².10mm diameter wire ropes with fibre core are used. The tensile designation of the wire is 1500.Number of rope wires is assumed to be 2. Number of rope wires is assumed to be 2. Calculate the weight of wire if weight of 50m wire is 18kg. Calculate the force due to acceleration.
An elevator is assembled to raise equipment to a height of 22m. It is estimated that maximum weight of the material to be raised is 4.9kN. It is observed acceleration in such cases is 1.2m/s².10mm diameter wire ropes with fibre core are used. The tensile designation of the wire is 1500.Number of rope wires is assumed to be 2. Number of rope wires is assumed to be 2. Calculate the total load on wire rope neglecting the bending load if weight of 50m wire is 18kg.
Which statements are CORRECT? I. In early 1930’s Nylon was prepared from coal, water and air. II. Nylon was the first fully synthetic fibre. III. Nylon fibre was strong, elastic and light.
Which statements are CORRECT? I. In early 1930s Nylon was prepared from coal, water and air. II. Nylon was the first fully synthetic fibre. III. Nylon fibre was strong, elastic and light.