In an air conditioning system, the inside and outside conditions of air are 25 °C DBT and 50%
RH, and 40 °C DBT and 27 °C WBT, respectively. The room sensible heat ratio is 0.8, while
50% of the room air is rejected to atmosphere and replaced with an equal quantity of fresh air
before entering the air conditioning apparatus. If the fresh air added is 100 m3
/min and the air
density is 1.2 kg/ m3 with zero air by-passing, determine: a) Room sensible and latent load, b)
Sensible and latent heat due to the fresh air, c) Apparatus due point, d) Humidity ratio and dry
bulb temperature of the air entering to the air conditioning apparatus. Ans. a) 53.96 kW,
14.04 kW; b) 30.67 kW, 39.73 kW; c) 11.8 °C; d) 0.0138 kg/ kg dry air, 32.5 °C

Why is crowding out an important issue in the debate over the merits of discretionary fiscal policy? Is crowding out equally likely to occur during all phases of the business cycle?

Keynesian economists emphasize the effects of fiscal policy on aggregate demand whereas supply-side economists focus on the effects on aggregate supply. Discuss the process by which a tax reduction might result in an increase in real output and employment according to these two approaches. If tax reductions are beneficial for the economy, why doesn't the government slash taxes to zero.

Assume that the economy's marginal propensity to consume is 0.8. To combat a recession, suppose that the federal government increases its expenditures by $50 billion. If prices remain constant, what impact will this policy have on the economy's aggregate demand and real output? Instead, suppose that prices increase as the economy's aggregate demand increases. What effect would this have on your answer?

A manufacturer of computers claims its newest model has a mean battery life of 10 hours, although normally distributed variations in computer production will cause some units to have more or less battery life. A consumer advocacy group is concerned the true mean is less and is constructing a hypothesis test at the 95% significance level to evaluate the claim. In their testing for battery life, a sample of 25 randomly selected units gave a sample mean of ̄x25 = 9.6, with sample standard deviations25= 0.8. (a) Clearly state the null hypothesis and alternate hypothesis for the test. (b) Determine the appropriate test statistic and compute it. (c) On the basis of this test statistic value, what conclusion does the test reach regarding the battery life claims? (d) If the conclusion reached happens to be incorrect, would it be a type I error or type II error? Explain.

2)

A three-phase synchronous generator is rated 16 kV and 200 MVA, has negligible losses and has reactance of 1.65 pu. The generator is operated on an infinite bus of 15 kV voltage and delivers 100 MVA at 0.8 Power Factor, lagging.

a)Determine the internal voltage (E_i), the power angle (δ), and the line current of the machine.

b)If the field current of the machine is reduced by 10%, while the mechanical power input to the machine is maintained constant, determine the new value of the power angle (δ) and reactive power delivered to the system.

c)The prime mover is next adjusted without changing the excitation so that the machine delivers zero reactive power to the system. Determine the new power angle (δ) and the real power being delivered to the system.

d)What is the maximum reactive power that the machine can deliver if the level of excitation is maintained as in part b?

QUESTION 4

State whether each of the following are TRUE or FALSE, and explain your reasoning for the answer:

1. The binomial distribution is defined by its mean and standard deviation.

2. As the sample size increases, the standard error of the mean decreases.

3. If the population distribution is unknown, in most cases the sampling distribution of the mean can be approximated by the normal distribution if the samples contain at least 10 observations.

(b)       Suppose the following trend line and seasonal indices were obtained from four (4) years of sales data (in $ million) for a multinational grocery chain from 2012 to 2015.

Trend line:        y_t = 112 + 2.6t

Seasonal Effect:

1. Interpret fully the seasonal indices for the first and second quarters.

   (1 mark)

2. Forecast the sales value in the fourth quarter for the next year (2016).

(1 mark)

            You have decided to open a restaurant in Huntington. The following table gives the payoffs based on two states of nature, favorable and unfavorable demand. You     believe that the probability of a favorable market is 0.8. You can open any one of        three different sizes of restaurant.     

            You have decided to do some marketing research (using the skills that you learned). If the marketing research is positive (probability = .7), then the probability of favorable demand goes to .95. If the marketing research is negative (shows weak demand) (probability of .3), then the probability of favorable demand goes to .40.

1. Using all of the information, what should you do? Provide calculations.

2. What is the expected value of perfect information?

3. What is the expected value of sample information?

Exercise 9-7

Sarasota Company follows the practice of pricing its inventory at the lower-of-cost-or-market, on an individual-item basis.

From the information above, determine the amount of Sarasota Company inventory.

Your firm specializes in the construction of short track speed skating ice rinks. The popularity of this sport at the Winter Olympics has resulted in lots of new business for your firm. To meet this demand, you've decided to buy or lease a new Terex tower crane for use over the next four years. You have two choices:
1)Buy the crane from Terex for $600,000 and sell it back to them in 48 months for $240,000.
2)Lease the crane from Terex for $11,000 per month for 48 months. If you choose to lease the crane, they will make the first and last payments on your behalf (so that you only have to make payments in months 2 through 47).
Your opportunity cost of capital is 0.8% per month. Should you lease or buy the new crane?

SHOW YOUR WORK, DO NOT USE EXCEl