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systems analysis and design

Questions and Answers of Systems Analysis And Design

15. How do system clocks and bus clocks differ?
14. Explain the difference between clock cycles and clock frequency.
13. What are the four types of bus arbitration?
12. What is the difference between synchronous buses and nonsynchronous buses?
11. Name three different types of buses and where you would find them.
10. What is a bus cycle?
9. Explain the differences between data buses, address buses, and control buses.
8. Why is a bus protocol important?
7. What is the difference between a point-to-point bus and a multipoint bus?
6. Why is a bus often a communications bottleneck?
5. How does the ALU know which function to perform?
4. Where are registers located, and what are the different types?
3. What does the control unit do?
2. What purpose does a datapath serve?
1. What is the function of a CPU?
16. A 14-inch (nominal) schedule 40 cast-iron pipe is used to convey 12 million gallons per day of benzene. The pipeline is 3 miles long, the pump motor is 39 percent efficient, and electricity costs
15. (a) For the network shown in Fig. P1-15(a), find the flow rate in each pipe and the pressure at each node if the pressure at node A is 100 psig (C = 100).(b) If heat exchangers and valves are
14. Water at 200°F flows through the pipeline system shown in Fig. P1-14. The pressure PA in tank A is 70 psig. The entrance to the pipe system is sharp edged. The lengths are L₁ = 100 ft, L2= 15
13. (a) Room-temperature water flows between two reservoirs through two cast-iron pipes that are connected in series, as shown in Fig. P1-13. The entrance, exit, and pipe interface are sharp edged.
12. A military jet transport uses JP-4, a kerosenelike fuel. The fuel distribution network is shown in Fig. P1-12. What pressure and power must the booster pump at A develop if the minimum inlet
11. In Problem 9 what would be the effect on the line flow rates and node pressures if a device with a pressure-drop relationship of AH = 23Q2 were placed in line 6?
10. In Problem 9, what would be the effect on the line flow rates and node pressures if a pump with the head flow-rate relationship$$ΔΗ(ft-lbf/lbm) = 75.0 - 16Q^2$$were placed in line 10?
9. Determine the flow rate in each line and the pressure at each node for the system shown in Fig. P1-9. The Hazen-Williams coefficient is 100, and the pressure at node A is 88 psig. Pipe lengths and
8. A light oil at 100°F is to be pumped in a 1,000-ft-long nominal 3-in. schedule 40 pipe. Devise a procedure to evaluate K and n in the Hazen-Williams head loss expression for this pipe.
7. A chilled-water air-conditioning system is to be designed for a four-story office complex, as outlined in Fig. P1-7. Each story requires a chilled-water flow rate of 18,000 lbm/h. All water flow
6. In Problem 5, what would the flow rate be if the pump delivered 5 hp to the fluid?
5. (a) A pump moves 0.4 ft³/s of light oil through a 2-in. ID, cast-iron line 500 ft long, as shown in Fig. P1-5. Determine the pumping power required.(b) What power would be required if the oil
4. A hydraulic turbine requires 2,000 gpm flow through a 10,000-ft-long pipe. The available head is 100 ft-lbf/lbm. The pipe is to be schedule 40 commercial steel, and a gate valve (C =0.17 fully
3. An old pipe 12 in. in diameter has a roughness of $$e = 0.1 in$$. A $$ \frac{1}{2} $$-in.-thick lining would re-duce the roughness to $$ε = 0.0004 in$$. How much in pumping cost would be saved
2. The cold-water faucet in a house feeds from a water main where the pressure is 3 bar. The system consists of 50 m of 15-mm ID galvanized pipes, three 90° standard elbows, a fully opened gate
1. A cast-iron pipeline carries 4 million gallons of water (at 55°F) per day. Over a 3-mile seg-ment of the pipeline the elevation decreases by 400 feet. The costs of installation for three pipe
18. Generate a set of initial flow-rate guesses (Hardy-Cross procedure) that satisfy conservation of mass for the following network. Indicate the magnitude and direction of each flow rate.4 cfs +1
17. A pump with an increase in head, Ws = 83.9 - 15.0Q + 2.10Q2, and a heat exchanger with a head loss of 4.6Q2 are placed in line 4 of a network. What are the Bjm's required to account for these
16. For the following friction factors and Reynolds numbers, classify the flow regime as indeterminate, laminar, transitionally turbulent (or rough), or fully turbulent (or rough).Friction factor
15. For a segment of a pipe, e = 0.06 mm, D = 5 cm, V = 4 m/sec, and v = 6 × 10-6 m²/sec.Find the friction factor f and the fully rough friction factor fr.f =fr =
14. A piping system contains a device that results in the fluid's changing its density and temper-ature. For the system shown in Fig. RQ1-14, the pressure drop through the device is 12.5 psi.Other
13. Line 6 contains a pump with the characteristic curve $$H = 100.0 + 5.0Q - 0.1Q^2$$ What are the $$B_{jm}$$'s for use in the generalized Hardy-Cross method?
12. Why is the friction-factor-based Hardy-Cross method more useful than the Hazen-Williams-based Hardy-Cross method?
11. In order to start the Hardy-Cross procedure, how many arbitrary flow-rate guesses must be made for the network shown in Fig. RQ1-11?FIGURE RQ1-11
10. Why is initial mass conservation at nodes so important for the Hardy-Cross procedure?
9. For a standard elbow for a 3" schedule 40 commercial steel pipe, the loss coefficient is _____.
8. For Example 1-9(a), what is the pressure at node C (Fig. 1-25) if the pressure at node B is 100 psia? The density of the fluid is 62.4 lbm/ft³.
7. What are the differences in power delivered and pressure drop for the series and parallel situations illustrated in Fig. RQ1-7? The head loss through each device is proportional to the square of
6. What two principles are used in solving series-parallel network problems?
5. In the fully rough (complete turbulence) regime, of what is f a function?
4. What are minor and major losses?
3. How does the energy equation differ from the Bernoulli equation?
2. What are the assumptions of Bernoulli's equation,$$P + ho \frac{g}{g_c} z + \frac{1}{2} ho \frac{V^2}{2g_c} = constant$$
1. What are the differences between the Lagrangian and Eulerian approaches to fluid mechanics?
10–75 If in the circuit of Figure P10–74, μ is −3, R = 1kΩ, C = 1 μF, and vSðtÞ = 5 uðtÞ:(a) Locate the poles and zeroes of VOðsÞ, identifying the forced and the natural poles.(b) Find
10–65 Compare the results of your designs of the circuits in Figures P10–63 and P10–64. Since both circuits purport to have the same response characteristics, what are the advantages and
10–60 There is no external input in the circuit in Figure P10–59.(a) Find the zero-input node voltages vAðtÞ and vBðtÞ, and the voltage across the capacitor vCðtÞ when vCð0Þ = 0 V and
10–57 Find the transform of the Thévenin equivalent circuit looking into the v2ðtÞ terminals for the circuit of P10–55.
10–56 There is no initial energy stored in the bridged-T circuit in Figure P10–55.(a) Transform the circuit into the s domain and formulate node-voltage equations.(b) Use the node-voltage
10–44 A0:1-μF capacitor is connected across the interface in Figure P10–43. Find the voltage across it.
10–42 For the circuit of Figure P10–41:(a) Find the Thévenin equivalent circuit that the 5R load resistor sees in when vCð0Þ = V0 V.(b) Then find the voltage delivered to the load vOðtÞ if
10–40 Repeat Problem 10–39 when iSðtÞ = 1:5 cos2000t uðtÞmA.
10–38 The circuit in Figure P10–36 is in the zero state. Transform the circuit into the s domain and find the Thévenin equivalent circuit at the capacitor’s terminals.
10–37 The initial conditions for the circuit in Figure P10–36 are vCð0Þ = 0 and iLð0Þ = I0. Transform the circuit into the s domain and use superposition and voltage division to find the
10–33 The switch in Figure P10–32 has been in position B for a long time and is moved to position A at t = 0:(a) Transform the circuit into the s domain and solve for VCðsÞ in symbolic form.(b)
10–31 Transform the circuit in Figure P10–29 into the s domain and find ILðsÞ and iLðtÞ when v1ðtÞ = VAe−1000tuðtÞ, R = 100 Ω, L = 100mH, and iLð0Þ = 0A. Validate you answer using
10–30 Repeat Problem 10–29 if v1ðtÞ = VAuðtÞ.
10–28 The switch in Figure P10–27 has been in position B for a long time and is moved to position A at t = 0. Transform the circuit into the s domain and solve for VCðsÞ, vCðtÞ, VOðsÞ, and
10–26 The switch in Figure P10–25 has been in position B for a long time and is moved to position A at t = 0. Transform the circuit into the s domain and solve for ILðsÞ and iLðtÞ in symbolic
10–24 If the input to the RLC circuit of Figure P10–23 is vSðtÞ = uðtÞ:(a) Find the output voltage transform VLCðsÞ across L and C taken together.(b) Use the initial- and final-value
10–22 The circuit in Figure P10–21 has R = 1kΩ and L = 1H.A load is connected across the output equal to ZLðsÞ = s +500 Ω. Identify the natural poles and zeroes of the load voltage.
10–6 For a series RLC circuit find ZEQðsÞ, and then if R = 10kΩ and L = 1 H, select C so that there is a pole at s = 0 and zeroes at s1, s2 = ð−5 ± j 8:66Þ krad=s. Repeat so that there are
10–5 For the circuit of Figure P10–4, remove the short circuit between nodes A and B.(a) Find and express ZEQðsÞ as a rational function and locate its poles and zeroes.(b) Select values ofR and
10–2 For a parallel RC circuit, find ZEQðsÞ and then select R and C so that there is a pole at s = −250 krad=s.
10–1 For a series RC circuit, find ZEQðsÞ and then select R and C so that there is a pole at s = 0 and a zero at s = −10 krad=s.
The circuit determinants of three circuits to be studied in subsequent chapters are given below. Determine the nature of the poles of each circuit and what conditions, if any, could cause the circuit
10-3 General Circuit Analysis (Sects. 10–4–10–6)Given a linear circuit:(a) Determine the initial conditions (if not given) and transform the circuit into the s domain.(b) Solve for zero-state
10-2 Basic Circuit Analysis Techniques (Sects. 10–2 and 10–3)Given a linear circuit:(a) Determine the initial conditions (if not given) and transform the circuit into the s domain.(b) Solve for
10-1 Equivalent Impedance (Sects. 10–1 and 10–2)Given a linear circuit, use series and parallel equivalence to find the equivalent impedance at specified terminal pairs.Select element values to
=+(c) At another time the system is operating at 60 percent of full capacity. Deter mine satisfactory operating conditions and describe them. (d) At still another time the load drops to 25 percent of
=+ (b) Suppose the system is operating under a load of 900 tons (3165 KW) and describe some acceptable oper-ating conditions.
=+ (a) Compute the full load chilled water flow rate and describe the operating conditions of the system (flow rates, bypass flow, pump speeds, etc.),
=+16-40.(4220 KW) and is designed to operate with water supplied ut 42 F (6 C) and returned at 65 F(18 C). The chillers have equal capacity and there are two 3500 rpin variable spond primary pumps of
=+A variable primary piping system like the one shown in Fig. 10-37 has a capacity of 1200 sont
=+10-39.Referring to Problem 10-36, the vented dry return becomes a vented wet return at the point where all the condensate empties into the line that continues to the condensate tank. The decrease
=+10-38.Assuming that each heating device in Problem 10-36 has the same heating capacity and each has a vented dry return, find an acceptable pipe size for the condensate leaving each device.
=+10-37.Suppose the steam system of Problem 10-36 has a total design load of 850 Ibm/hr (0.11 kg/s).What size pipe should be used between the boiler and the first branch, if the total equivalent
=+10-36.Sketch a low-pressure steam system layout showing a boiler, piping, air vents, traps, steam sep-arator condensate pump(s), etc ., for a building system where the boiler is located in a
=+garage. The load for the complex is expected to be quite variable from day to night (a) In a two-dimensional sketch layout the secondary water distribution system from the main equip ment room to
=+10-35.building in each corner. Each building is approximately 950 ft (290 m) square. The remaining space is parking and landscaping. A parking garage is located below grade and extends part way
=+10-34.center court yard 40 ft (12 m) square. There are 16 apartments, each to be cooled with a nom-inal 1 ton fan-coil unit requiring 2.25 gpm (0.142 L/s) of chilled water with 45 F (7 C) enter-ing
=+(b) How much space is required for the storage tank? (Assume a cubical space.)A two-story apartment building is approximately 260 ft (80 m) square on the outside with a
=+for up to 2 hours. The system is designed to supply chilled water at 45 F (7 C) and to retum water at 60 F (16 C). (a) What is the minimum capacity of the chilled water storage in gal (m'y?
=+10-33.A chilled water system for a church complex is designed as shown in Fig. 10-36 with chilled water storage for short periods of peak load. The chillers have a combined capacity of 80 tons(280
=+10-32.equivalent lengths for the section exclusive of the control valve. Specify the secondary pump performance requirement.
=+10-31. Size the pipe for the tertiary water circuit shown in Fig. 10-54. The pipe is type L copper.Notice that the lengths given are the total equivalent lengths excluding the coil and control
=+10-30.Consider the system in Fig. 10-35, where the chillers are of equal size. Design and part-load operating conditions are the same as Problem 10-29. (a) What is the flow rate of the water in the
=+10-29. Consider the system shown in Fig. 10-34, where the chillers are of equal size. Assume the sys-tem is designed to circulate 1200 gpm (76 L/s) under full-load design conditions at 42 F (5.6
=+(b) How much water is supplied and returned to the secondary circuit? (c) Size the main sections of the tertiary circuit, the common pipe, and the connections to the secondary circuit
=+10-28.Consider the tertiary circuit shown in Fig. 10-34. The primary supply water temperature is 40(4.5 ℃), and the controller for the secondary two-way valve with its sensor located at D) is set
=+10-27.Refer to Problem 10-26 and consider placement of the expansion tank and makeup system in the circuit on the twentieth floor and set at 5 psig (35 kPa), (a) Determine the pressure at the pump
=+(c) If domestic water for makeup is available at 60 psig (414 kPa), is this a feasible location for the expansion tank?
=+ Assume 12 ft (3,7 m) per story, (b) What is the pressure in the system on the twentieth floor when the pump is not running, assuming the pressure at the pump suction does tu change?
=+10-26.A secondary pump located in the basement of a 20-story building circulates water throughout There is 25 ft (8 m) of lost head in the riser to the twentieth floor. The pump produces 60 6(18.3
=+10-25.Find the volume of a free surface expansion tank for a hot water system with a volume of 1500 gal (5.7 m3). The system gage pressure is regulated to 20 psi (140 kPa) at the tank and initially

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