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Which of the following is true for economic spacing?

Which of the following is true for economic spacing? Correct Answer cost of trusses should be equal to twice the cost of purlins plus cost of roof coverings

For economic spacing of roof trusses, the cost of trusses should be equal to twice the cost of purlins plus cost of roof coverings. This equation is used for checking the spacing of trusses and not for design of trusses.

Related Questions

All the forms of matter except gases emit electromagnetic radiation continuously. The gases which electrically or thermally excited emit a certain wavelength only, then which of the following is/are true about the process (i) The spacing between the atoms in the other forms of matter is high than in gas (ii) The spacing between the atoms in gases is high than the other forms of matter (iii) The energy of the emitted radiation depends on the spacing between the atoms (iv) The wavelength of the emitted radiation depends on the spacing between the atoms 
The given statements state the differences between economic development and economic growth. Which of the following statement is correct?  I. Economic growth is single-dimensional whereas economic development is multi-dimensional. II. Economic growth is measurable, but economic development cannot be precisely measured. 
The growth rate of pearlite, v, and the interlamellar spacing S are given by the following relation, $$v = k.\frac{1}{S}\left( {\frac{{1 - {S_c}}}{S}} \right)$$    where Sc is the critical spacing at which the growth rate is zero and k is a materials constant. The actual interlamellar spacing observed will correspond to
From an alloy, two specimens are machined and tested separately under tension and compression. The engineering stress-strain curves as well as the true stress-true strain curves for tension and compression are plotted in the same diagram. Identify the correct statements:
P. The engineering stress-strain curves in tension and compression are identical.
Q. The true stress-true strain curve in compression is lower than the true stresstrue strain curve in tension due to Bauschinger effect.
R. The true stress-true strain curve in tension is above the corresponding engineering stress-strain, curve.
S. The true stress-true strain curve in tension and compression are identical.
Given below are six sentences of a  passage. The first and sixth sentences are given in the beginning as S1 and S6. The middle four-sentence in each have been jumbled up and labelled as P, Q, R and S. You are required to find the proper sequence of the four sentences. S1: In a globalised world, no country can hope to impose tariffs without affecting its own economic interests. S6: The ongoing trade war also threatens the rules-based global trade order which has manages to amicably handle trade disputes between countries for decades. P: So both the U.S. and China, which have blamed each other for the ongoing trade war, are doing no good to their own economic fortunes by engaging in tit-for-tat tariff battle. Q: Apart from disadvantaging its consumers, who will have to pay higher prices for certain goods, tariffs will also disrupt the supply chain of producers who rely on foreign imports. R: China, which is fighting an economic showdown, will be equally affected. S: The minutes of the U.S. Federal Reserve June policy meeting show that economic uncertainty due to the trade war is already affecting private investment in the U.S., with many investors deciding to scale back or delay their investment plans.
Each item consists of six sentences of a passage. The first and sixth sentences are given in the beginning as S1 and S6. The middle four sentences in each have been jumbled up and labelled as P, Q, R and S. You are required to find the proper sequence of the four sentences and markyour response accordingly on the Answer Sheet.
S1 :In a globalized world, no country can hope to impose tariffs without affecting its own economic interests.
S6 :The ongoing trade war also threatens the rules-based global trade order which has managed to amicably handle trade disputes between countries for decades.
P :So both the U.S. and China, which have blamed each other for the ongoing trade war, are doing no good to their own economic fortunes by engaging in this tit-for-tat tariff battle.
Q : Apart from disadvantaging its consumers, who will have to pay higher prices for certain goods, tariffs will also disrupt the supply chain of producers who rely on foreign imports.
R : China, which is fighting an economic slowdown, will be equally affected.
S :The minutes of the U.S. Federal Reserve June policy meeting show that economic uncertainty due to the trade war is already affecting private investment in the U.S., with many investors deciding to scale back or delay their investment plans
The correct sequence should be
Directions : In each of the following questions a statement is given, followed by three conclusions. Give answer :

Statement : The economic condition continues to be critical even after a good harvest season.

Assumptions :
I. The economic condition was not critical before the harvest season.
II. The economic condition could not have improved without a good harvest season.
III. The economic condition was expected to improve after a good harvest season.
Given below are four jumbled sentences. Select the option that gives their correct order. The United States and all other modern industrial economies experience significant swings in economic activity. Periods of economic prosperity are typically called expansions or booms; periods of economic decline are called recessions or depressions.  The combination of expansions and recessions, the ebb and flow of economic activity, is called the business cycle. In some years, most industries are booming and unemployment is low; in other years, most industries are operating well below capacity and unemployment is high.
Jet airlines have business and economic class in planes to New York. On 2nd of Jan, number of passengers in business and economic class were 3 : 7.the fare charged for business to economic class is in the ratio 5 : 3. If the total fare collected from these classes were Rs. 241920, how much fare was collected from economic class?
The question below consists of a set of labelled sentences. Out of the four options given, select the most logical order of the sentences to form a coherent paragraph. P: Recession can be defined as a significant decline in general economic activity extending over a period of time.  Q: For example, waking up to find firms and industries downsizing their workforce, prices of basic commodities rising by the minute, cost of healthcare being far from affordable, crime rate and insecurity being the only topic of the day due to the super high cost of living. R: Many professionals and experts around the world believe that a true economic recession can only be confirmed if GDP (Gross Domestic Product) growth is negative for a period of two or more consecutive quarters. S: As inevitable the recession might seem to be to the economic life of the world, its effects have proved to be more widespread and devastating than we can imagine them to be.