Example 7.26 A hall 30m Long and 12m wide is to be illuminated and illumination required is 50 matre Candles Five types of lamps having lumen outputs as given below are available 300 500 1.000 Lumens 1.615 3.650 4.700 9.950 21.500 Taking a depeciation factor of 1.3 and utilisation coefficient of the number of lamps needed in each case to produce required illumination out of above five types of lamps select most suitable type and design a Suitable scheme and make a sketch showing Location of lamps Assuma asuitable mounting height and calculate space-heigh ration of lamps ​

Answers

Answer 1

Answer:

Area of the hall = length x width = 30m x 12m = 360 sq. m

Illumination required = 50 meter-candles

Total lumens required = area x illumination required = 360 x 50 = 18,000 lumens

Now, we can find the number of lamps needed for each type of lamp by dividing the total lumens required by the lumen output of each lamp, and then accounting for the depreciation factor and utilization coefficient:

For 300 lumen lamp: (18,000 / 300) x 1.3 x 0.4 = 31.2 lamps (round up to 32 lamps)

For 500 lumen lamp: (18,000 / 500) x 1.3 x 0.4 = 22.9 lamps (round up to 23 lamps)

For 1000 lumen lamp: (18,000 / 1000) x 1.3 x 0.4 = 13.5 lamps (round up to 14 lamps)

For 1615 lumen lamp: (18,000 / 1615) x 1.3 x 0.4 = 8.6 lamps (round up to 9 lamps)

For 3650 lumen lamp: (18,000 / 3650) x 1.3 x 0.4 = 3.9 lamps (round up to 4 lamps)

For 4700 lumen lamp: (18,000 / 4700) x 1.3 x 0.4 = 3 lamps (round up to 3 lamps)

For 9950 lumen lamp: (18,000 / 9950) x 1.3 x 0.4 = 1.4 lamps (round up to 2 lamps)

For 21500 lumen lamp: (18,000 / 21500) x 1.3 x 0.4 = 0.9 lamps (round up to 1 lamp)

The most suitable type of lamp would be the 1000 lumen lamp, as it requires the least number of lamps to produce the required illumination. A suitable scheme could involve mounting 14 of these lamps evenly spaced throughout the hall, at a mounting height of around 4-5 meters. The space-height ratio of the lamps would be around 1:1, meaning that the distance between each lamp would be roughly equal to the mounting height.

Explanation:


Related Questions

Explain 2 ways the goal setting can help learners for individuals who have lost their income due to Covid 19 positively change their situation

Answers

Answer:

Goal setting is a powerful tool for those who lost their income due to Covid-19 to improve their situation. Two ways goal setting can help are by providing direction and focus and boosting motivation and confidence. Setting specific, achievable goals can help individuals prioritize tasks and concentrate on what is most important, increasing productivity and achieving better results. Accomplishing goals can also provide a sense of fulfillment, boosting motivation and confidence to set new goals and strive for greater achievements. Overall, goal setting can positively impact individuals' wellbeing and help them achieve their objectives.

Does licensure guarantee quality service to young children? Discuss the reasons for your conclusion.​

Answers

Answer:

Licensure does not necessarily guarantee quality service to young children. While licensure is a critical aspect of ensuring that early childhood education providers meet basic standards, it does not always ensure high-quality care.

There are several reasons for this. First, licensure requirements vary by state and may not be comprehensive enough to ensure quality care. Second, even when providers meet the minimum requirements for licensure, they may not have the necessary training or expertise to provide high-quality care to young children. Third, licensure does not address issues of program quality, such as curriculum, teacher-child interactions, and program environment.

Furthermore, licensure alone does not address issues of equity and access to high-quality early childhood education. Low-income families, families of color, and families in rural areas may have limited access to licensed providers or may not be able to afford high-quality care even when it is available.

To ensure quality early childhood education, additional measures are needed beyond licensure. These may include ongoing professional development and training for providers, quality rating and improvement systems, and policies to support access to high-quality care for all families. Additionally, families must be empowered to make informed choices about their children's care and education, and must have access to resources and support to ensure that they can access high-quality care.

In conclusion, while licensure is an important aspect of ensuring basic standards of care for young children, it is not enough to guarantee high-quality care. Additional measures are needed to support ongoing quality improvement, address issues of equity and access, and empower families to make informed choices about their children's care and education.

Discuss THREE ways in which the media's portrayal of women as vulnerable members of society could lead to greater instances of violence towards women.

Answers

Answer: View answer in explanation below.

Explanation: The media's portrayal of women as vulnerable members of society can contribute to violence towards women in several ways:

Normalizing violence against women: Media often portrays women as victims of violence and crime, which can create a sense of normalization around violence against women. This can make it easier for perpetrators to justify their actions and can make it harder for society to recognize and respond to violence when it occurs.

Reinforcing gender stereotypes: Media representations of women often reinforce traditional gender roles and stereotypes, portraying women as weak and passive. This can contribute to a culture that devalues and marginalizes women, making it easier for perpetrators to justify violence and abuse.

Creating unrealistic expectations of women: The media's portrayal of women as vulnerable and helpless can create unrealistic expectations of women, leading to victim-blaming and contributing to a culture of disbelief when women come forward with stories of abuse or violence. This can make it harder for women to seek help and support when they need it and can contribute to a sense of isolation and shame.

Overall, the media's portrayal of women as vulnerable can contribute to a culture that devalues and marginalizes women, making it easier for perpetrators to justify violence and abuse. It is important for the media to recognize their role in shaping societal attitudes and to work towards more positive and empowering representations of women.

13. There are 15 boys and 10 girls in a class. If three students are selected at random, what is the probability that 1 girl and 2 boys are selected?​

Answers

Answer:

21/46

Explanation:

Combinations of 3 students from among 25 = 25!/(22!)(3!) = 2,300.

Combinations of 1 girl (G) from among 10 girls = 10!(9!)(1!) =10.

Combinations of 2 boys (BB) from among 15 boys= 15!/(13!)(2!) = 105.

Combinations of 1 girl and 2 boys (GBB) = 10*105 = 1,050.

Probability as requested = 1,050/2,300 = 21/46 = .456521739…~ 45.7%.

You could also calculate the probability as (10/25)*(15/24)*(14/23)*](3!)/(2!)] = .456521739…~ 45.7%. The (3!)/2!) factor accounts for the number of ways of probability selection: GBB has 3! arrangements but the B’s are interchangeable.

Which of the following is tested on the writing and language section of the
PSAT?
OA. Essay writing
B. Recognition of incorrect metrical form
OC. Recognition of errors in usage and structure
OD. Poetry analysis
SUBMIT

Answers

The recognition of errors in usage and structure can be tested on the language and writing section of the PSAT

What is PSAT

The PSAT/NMSQT® (National Merit Scholarship Qualifying Test), also known as the Preliminary SAT, is a practise version of the SAT exam. The PSAT can only be taken once per year, and many students take it in both 10th and 11th grade. If you score well on the PSAT in your junior year, you may be eligible for a National Merit Scholarship—$180 million in merit scholarships are awarded to students each year. The PSAT lasts 2 hours and 45 minutes and assesses your reading, writing, and math skills. Unlike the SAT, the highest possible PSAT score is 1520.

HOW LONG DOES THE PSAT LAST?

The PSAT is frequently administered during the school day in lieu of other classes. The test itself lasts approximately 3 hours, including breaks.

WHAT ARE THE SECTIONS OF THE PSAT?

A composite score, two section scores, and a variety of subsection scores will be assigned to you. The exam consists of four timed sections: Evidence-Based Reading, Writing and Language, Math (no calculator), and Math (calculator allowed).

To know more about PSAT, click on the link :

https://brainly.com/question/11359296

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