Answer the following questions:
1. Which smelling agent is added to LPG to detect leaks.
2. What is calorific value of a fuel?
3. What do you understand by ignition temperature?
4. What is combustion?
5. is combustion possible without the supply of oxyeen?
6. What are the requisites of combustion?
7. Name the different types of combustions
quoting examples
8. Give one property of each of the following
which helps in controlling fire:
(a) water (b)carbon dioxide
9. How is fossil fuel formed? ust some common
fossil fuels
10. What is biogas? How does it differ from LPG?
Answers
Answer:
1. Ethanethiol
Uses. Ethanethiol is intentionally added to butane and propane (see: LPG) to impart an easily noticed smell to these normally odorless fuels that pose the threat of fire, explosion, and asphyxiation. In the underground mining industry, ethanethiol or ethyl mercaptan is referred to as "stench gas".
2. The heat value of a fuel is the amount of heat released during its combustion. Also referred to as energy or calorific value, heat value is a measure of a fuel's energy density, and is expressed in energy (joules) per specified amount (e.g. kilograms).
3. The ignition temperature of a substance is the least temperature at which the substance starts combustion. Substances which spontaneously ignite in a normal atmosphere at naturally ambient temperatures are termed pyrophoric.
4. Combustion -
किसी जलने वाले पदार्थ के वायु या आक्सीकारक द्वारा जल जाने की क्रिया को दहन या जलना कहते हैं। दहन एक ऊष्माक्षेपी अभिक्रिया है। इस क्रिया में दहन आँखों से ज्वाला दिख भी सकती है और नहीं भी। इस प्रक्रिया में ऊष्मा तथा अन्य विद्युतचुम्बकीय विकिरण भी उत्पन्न होते हैं। आम दहन के उत्पाद गैसों के द्वारा प्रदूषण भी फैलता है।
5. No
6. Oxygen
7.
Answer:
Ovaries produce female gametes called ova. In human beings, a single mature egg is released every month.