What pays off?

1 Answer

Answer :

It depends a bit on what you heat and what object you heat ...: o But wood is usually cheaper, especially if you at least partially process it yourself.

Related questions

Description : Which one of the following is a physical change? (a) Burning of coal (b) Burning of wood (c) Heating of a platinum crucible (d) Heating of potassium chlorate

Last Answer : Ans:(c)

Description : Carbonisation of coal consists of  A. drying and crushing the coal to a fine powder  B. moulding the finely ground coal under pressure with or without a binding material  C. heating the wood with a limited supply of air to temperature not less than 280°C  D. none of the above

Last Answer : Answer: D

Description : Is heating the streets for snow removal cheaper than snowplows?

Last Answer : Maybe in small areas it works - they talk about 10 acres of heated sidewalks and streets, and mention that they're using waste heat . So for 10 acres, it might work. I think that for a full city ... that the maximum melt was only 1 per hour. That means in a serious blizzard, it would be worthless.

Description : Gas vs. Electric Heating - Which is cheaper?

Last Answer : I’m in NYS. Gas and oil are way cheaper than electric here. Another trick, get an electric fireplace that really heats and put it in the room you spend the most time. They make nice difference, heating the room you’re in and they don’t run up the electric bill.

Description : Is it cheaper to use a wood pellet stove to heat my house, or will propane be more affordable?

Last Answer : A pellet stove is a good room heater but may be much more expensive for overall house heating than a regular furnace.

Description : Is central heating in a four room house more cost effective than a wood furnace?

Last Answer : Wood is fairly expensive. It can be if you can cut your own wood though.

Description : Laugh or not. And if not why not.

Last Answer : What coal? Brown? Laughs, it doesn't look nice. :-)) Someone will argue that your glass is black, but I also like black wood: - (I like the fireplace in the living room, but it is necessary ... an ash drawer under it, which can be emptied even if you're drowning, unfortunately the cheap ones don't.

Description : Heating value of coal is approximately (A) 1000-2000 kcal / kg (B) 2000-4000 kcal / kg (C) 5000-6500 kcal / kg (D) 9000-10,500 kcal / kg

Last Answer : Ans: C

Description : Coke is made by heating coal in the absence of air at: A. 700 °C B. 1300 °C C. 900 °C D. 1700 °C ANSWER: Why are soft drinks made with chilled water rather than water at room ... B. Chilled water enhances the taste C. Chilled water attracts more carbon dioxide D. Chilled water is more hygienic

Last Answer : ANSWER: C

Description : Coke is made by heating coal in the absence of air at: A. 700 °C B. 1300 °C C. 900 °C D. 1700 °C ANSWER: Most of the ozone in the atmosphere is concentrated in the _____ A. Mesosphere B. Troposphere C. Stratosphere D. Ionosphere

Last Answer : ANSWER: C

Description : Coke is made by heating coal in the absence of air at-----? A. 700 °C B. 900 °C C. 1300 °C (Answer) D. 1700 °C

Last Answer : C. 1300 °C (Answer)

Description : Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent. (A) 10-15 (B) 25-30 (C) 45-50 (D) 65-70

Last Answer : (B) 25-30

Description : Beehive coke oven (A) Facilitates by-products recovery (B) Takes 2-3 days for coking of coal but requires no external fuel for heating (C) Gives larger yield of coke (around 85%) as compared to by-product ovens (D) Produces coke with very poor strength

Last Answer : (B) Takes 2-3 days for coking of coal but requires no external fuel for heating

Description : Prime coking coal is always blended with medium or non- coking coal before carbonisation (A) To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls (B) Because, it alone produces unreactive coke (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

Description : Gross heating value of coal is __________ the net heating value. (A) Higher than (B) Lower than (C) Same as (D) Either (A) or (B); depends on the type of coal

Last Answer : (A) Higher than

Description : Gross heating value of coal is __________ the net heating value. (A) Higher than (B) Lower than (C) Same as (D) None of these

Last Answer : (A) Higher than

Description : 64-132) rank coal (ASTM) means a coal with 64% (A) Fixed carbon and having a heating value around 13, 200 BTU/1b (B) Ash and heating value around 13, 200 BTU/1b (C) Fixed carbon and heating value around 132 BTU/1b (D) None of these

Last Answer : (A) Fixed carbon and having a heating value around 13, 200 BTU/1b

Description : Blast furnace coke is made from coal by (A) Low temperature carbonisation (B) High temperature carbonisation (C) Medium temperature carbonisation (D) Heating the coal in an oven in presence of air

Last Answer : (B) High temperature carbonisation

Description : 64-132) rank coal (ASTM) means a coal with 64% (A) Fixed carbon and having a heat value of 13, 200 BTU/1b (B) Ash and a heating value of 13, 200 BTU/1b (C) Fixed carbon and a heating value of 132 BTU/1b (D) None of these

Last Answer : (A) Fixed carbon and having a heat value of 13, 200 BTU/1b

Description : High rate of heating of coke ovens (A) May damage its walls due to abrupt excessive swelling of coal (B) Produces larger size coke (C) Increases the time of carbonisation (D) None of these

Last Answer : (A) May damage its walls due to abrupt excessive swelling of coal

Description : A coal that softens and fuses on heating is (A) Classified (B) Carbonised (C) Caking (D) Non-caking

Last Answer : (C) Caking

Description : Washing of coal does not reduce its (A) S & P content (B) Heating value (C) Fusion point of ash (D) None of these

Last Answer : (D) None of these

Description : Sulphur in metallurgical coal (A) Contributes to its heating value (B) Affects the quality of steel produced as cracks develop on the surface while rolling the steel (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

Description : Gas based fertiliser plants use (A) Natural gas as a source of hydrogen (B) Natural gas as heating medium (C) Coal gas as a source of hydrogen (D) Coal gas as heating medium

Last Answer : (A) Natural gas as a source of hydrogen

Description : Coal based fertiliser plants at Ramagundam (Andhra Pradesh) and Talcher (Orissa) (A) Use coal for heating purpose (B) Gasify coal to get hydrogen from coal gas (C) Use coal as filler in fertiliser (D) Use coal as conditioner in fertiliser

Last Answer : (B) Gasify coal to get hydrogen from coal gas

Description : Dowtherm is a (A) High temperature heating medium (a petroleum product) (B) Product of coal tar distillation (C) Very heat sensitive material (D) None of these

Last Answer : Option A

Description : Heating value of coal is approximately in power plant (A) 1000-2000 kcal / kg (B) 2000-4000 kcal / kg (C) 5000-6500 kcal / kg (D) 9000-10,500 kcal / kg.

Last Answer : 5000-6500 kcal / kg

Description : Which of the following gas is mostly used in town for street and domestic lighting and heating?  A. Producer gas  B. Coal gas  C. Mond gas  D. Coke oven gas

Last Answer : Answer: B

Description : The strong heating of coal in absence of air is known as _______. a) destructive distillation b)refining c)combustion d)burning

Last Answer : a) destructive distillation

Description : Can you safely burn wood in a gas-log fireplace, or coal in a gas-coal fireplace?

Last Answer : I know, of course, that you can't just up and burn wood in a gas fireplace with no adequate flu or ventilation. My REAL question, I guess, is whether a fireplace can burn both-the danger being the ... grate fire but use gas and inserts but would still like to burn the real thing every now and then.

Description : You have three stoves: a gas stove, a wood stove, and a coal stove, but only one match. Which should you light first? -Riddles

Last Answer : The match!

Description : I thought of buying wood or coal for next season. I have a new property and I will be in it for the first year next winter. So it occurred to me to start looking for fuel after the season, I think the ... up better? I have a property of 3 +1. Gas is not introduced in our country, so coal or wood.

Last Answer : Depending on your boiler ... Not all boilers are suitable for all fuels. When it comes to wood, consider whether you have enough space to store it (it is very convenient to let the wood dry ... - if so, whether you are able to process it yourself. But I personally consider wood more advantageous.

Description : Among the fuels given below, the one with highest calorific value is – (1) Coke (2) Coal (3) Wood (4) Natural gas

Last Answer : (4) Natural gas Explanation: The calorific values of different fuels (in Kcal/kg) in dry state are: Wood: 3500; Coal: 4000-7000; Coke: 6500; and Natural Gas: 8600 Kcal/kg.

Description : Common energy source in Indian villages is: (a) Electricity (b) Coal (c) Sun d) Wood and animal dung

Last Answer : Wood and animal dung

Description : Combustion of which fuels from following is source of heat for boiler 1. Wood 2. Coal 3. Oil 4. All of above

Last Answer : 4. All of above

Description : _________ is a substance which undergoes spontaneous combustion. a) wood b)coal c)sodium d)cow dung cakes

Last Answer : c)sodium

Description : Among the fuels given below, the one with highest calorific value is (1) Coke (2) Coal (3) Wood (4) Natural gas

Last Answer : Natural gas