Suppose a system, as shown in the block diagram of a unity feedback loop, below, has a transfer function, P(s) = . We want to stabilize this system with a proportional integral (PI) controller, such that the poles of the characteristic equation are to be: si = S2 = S3 = -1. If we...
19 Aug 2020Problem Statement: For the shown plane wall problem, it is required to plot the variation of the following items; 1. the maximum temperature 2. location of the maximum temperature 3. q and q 4. T1, Ti & T2 with the variation of hi from 30 to 50000 W/m? K. 10 cm 15 cm hi h2 To1 To...
19 Aug 2020Compare between two stroke engine and four stroke engine, which have the same capacity, and operating at the same speed, regarding the power output and thermal efficiency. Explain. (4 marks) (b) The heat of formation can be positive and can be negative. Explain the conditions for...
19 Aug 2020State True (T) or False (F) for the following statements: i) For a beam with an unsymmetrical cross section, the location of the neutral axis of the cross section under partial and fully plasticity condition is the same. ii) The maximum elastic moment developed in a cross section...
19 Aug 2020A hollow cylinder has an 1. h. To inner radius , outer radius r, and length L. One end is maintained 0 h, at T while the other end is insulated. The cylinder T exchanges heat by convection at its inside and outside surfaces. The inside ambient temperature is T and the inside heat...
19 Aug 2020In an air diesel cycle, the compression ratio is 20:1, the cut off ratio (a=2). The air is at 100 KPa, 20 °C, and the volume (V, is 500 cc). n is 0.65, C, is 1.01 KJ/kg k. C, is 0.718 KJ/kg k. Calculate: 1- The mass of the air before compression. 2- The pressure at the end of co...
19 Aug 2020A cast-iron specimen with a cross-sectional area of 0.5 mm2 is stretched by a force of 100 N. Given the Young’s Modulus and the breaking stress of cast iron are 250 kN/mm2 and 300 N/mm2 respectively.Determine: the force requires to break the specimen.
19 Aug 2020A cylinder is rotating in a uniform stream of fluid as shown in Figure Q2(b) with the b) velocity potential as follow; a? cos 0 Г Ø = Ur 1 %3D -2 where r is the circulation. Show the derivation steps of tangential velocity, ve and determine the values of the circulation when the...
19 Aug 2020Vyvvvvvvvv 800 mm R=19.60 M = 19.68 0.8=15-7NM
19 Aug 2020A fluid flow over a solid surface with a laminar boundary layer velocity profile is approximated by the following equation: Ý = 2 () – ()* for y so and, 4 = 0 for y> 8 i). Show that this velocity profile satisfies the appropriate boundary conditions. ii) Determine the boundary la...
19 Aug 2020A pipe is insulated such that the outer radius of the insulation is less than the critical radius. Now the insulation is taken off. Will the rate of heat transfer from the pipe increase or decrease for the same pipe surface temperature? b) Consider a fluid whose volume does not c...
19 Aug 2020Bearing reactions R, and R, are exerted on the shaft shown in the figure, which rotates at 1150 rev/min and supports a 45-KN bending force. Use a 1095 HR steel. Specify a diameter d using a design factor of nd = 1.6 for a life of 10 hr. The surfaces are machined. 300 mm F = 45 kN...
19 Aug 2020Surface of a 0.05"-diameter, thin-walled tube is maintained at 100, In one case, air is in crossflow over the tube with a temperature of 25 & a velocity of 30. In another case, air is in fully developed flow through the tube with a temperature of 25 & a mean velocity of 30, Compa...
19 Aug 2020There is a pipe system below. Diameter of all pipes constant. Water at 20 C is going be transferred from reservoir A to reservoir B, which are very large. There is a pump in the system denoted with a circle and a valve denoted by a hexagon. The pipes AB and CD makes an angle of 4...
19 Aug 2020There is a patent application about an thermal engine. It operates between 167 C and 7 C reserviors. When it absorbs 1000kJ heat from 167 C resource, 0.12kW h electricity can be achieved. Using Carnot principle to determine if it is possible.
19 Aug 2020250 mm An 8 kg mass uniform rod AB is welded to a 10 kg mass disc as shown. If for this instant the angular velocity of the composite body is, WAB = 6 rad/s, determine a. angular acceleration of the composite body, a. b. components of the reaction at A. WAB %3D 30° R 150 mm B.
19 Aug 2020A constant force P is used to rotate a uniform T rod (mar = McD = 6 kg and AB =CD = 0.6 m) from position 1 to 2 as shown in the figure. Determine the angular velocity of the rod as it reaches position 2 if the spring is stretched 0.1 m at position 1. The system starts from rest. ...
19 Aug 2020RO.1 m A1 The figure shows a 6 kg rod AB pinned at A, the centre point of a 5 kg disc with a cen- troidal radius of gyration of 0.5 m, and to roller B which moves freely along the verti- cal slot. If the system is released from rest when 0 = 30° and the disc rolls without slip- 0...
19 Aug 2020The system is released from rest when A and B are on the same level as shown where the spring is stretched 0.2 m. Determine angular velocity of 0.4 m the disc when B is vertically below A. Idisc = 0.05 kgm2 mbc = 2 kg k=100 N/m 0.3 m 0.1 m 0.3 m
19 Aug 2020Plot the process of air(n=1.4) on p-v and T-s diagram, and indicate the minus or plus sign of and Au. (8 points) KI) Process 1-2: reversible compression process, n=1.6 K2) Process 1-3: reversible expansion process, n=1.2 0 0, 0, Au>
19 Aug 2020Simple Question & Answer (40 points): (1) In conduction, heat transfer rate is related to what two factors besides the surface and Or please write the mathematic expression of one dimensional form of Fouriers law of conduction. (4 points) (2) In heat transfer, we often group seve...
19 Aug 2020KAMI Shoe ( beat transfer, we often group several parameters together to forma ember which has special meanings. In convection, which dimensionless number determines the flow state? And the heat transfer coefficient is often grouped which meses wumber, and is often expressed as a...
19 Aug 2020We would like our second order system to have a step response with an overshoot
19 Aug 2020out an thermal engine s do ult r agare There is a patient application about an this mal ensine, a It operates between 1 0 and 700 reserviers. when it absorbs 1000kJ heat from 1670 veçouro 0.12 kW in electricity into be achieved. Using Carnot principle to determine if its possible...
19 Aug 2020Figure Q-3 below, shows a block diagram of unity feedback system with controller transfer function, C(s), disturbance, W(S), and plant transfer function, P(S). Determine a) The transfer function Try(s) = Y(S)/R(s); [12 pts.] b) The transfer function, E(S)/R(S); [10 pts.] c) The T...
19 Aug 2020Consider the following pipe network, with dimensions is not to scale. dimensions as shown. Note the dig fluid levels h.kam hF All 90° bends/elbows - long sweep. Throlit Given data: Pipe diameter - 150 mm. Material - steel = 0.0002m Working fluid - Tight" oil Fluid temperature - 1...
19 Aug 2020A 5-cm-diameter steel sphere (p=7800 kg/m?, c=0.46 kJ/kg. •C, k=35 W/m..C) is initially at a uniform temperature of 200°C. It is suddenly exposed to an environment at 20 •C having a heat-transfer coefficient h=28W/m2 • °C. Using the lumped-capacity method of analysis, write out t...
19 Aug 2020The shaft is made of A992 steel. It has a diameter of 25 mm and is supported by bearings at A and D, which allow free rotation. Determine the angle of twist of B with respect to D. •b/d = 1.15° a B90 Nm B 0.6 m 0.75 m 2 0 90 N.m 0.9 m
19 Aug 2020A4 m high and 1 m wide reservoir is used to collect rainwater (SG = 0.98) for the purpose of plantation. The reservoir is equipped with a discharged conduit in order to prevent overflow as shown in Figure Q2(b). A circular plate with a radius of 50 cm is used as a gate at the end...
19 Aug 2020Fluid Mechanics Exercise Hydrostatic Force Question 1 A 6-m height, 5-m wide rectangular plate blocks the end of a 5-m deep fresh water channel, as shown in the figure given. The plate is hinged about the horizontal axis along its upper edge through a point A and is restrained fr...
19 Aug 2020VB= 2 m/s 30° mass and size A and B VA = 0.5 m/s Two metal balls of equal mass and size A and B collides with velocities and directions as shown. Determine the velocities of both balls immedi- ately after impact. The coefficient of restitution, e=0.6. 60° 30° 11 (Answer: VA2 = 1....
19 Aug 2020A cantilever beam shown in Fig. 2a is subjected to two transverse loads. The cross sectional profile of the beam is shown Fig. 2b. Determine the absolute maximum bending stress at section a-a of the beam. Hint: Find the moment at section a-a. S kN 5 kN 250 mm 300 mm- 250 mm 100 m...
19 Aug 2020We would like our second order system to have a step Q-1 response with an overshoot, OS 0.1 and a settling time, t, Assuming that all the poles are on the OLHP, determine the performance metrics, (a) The damping ratio, 5; (b) The natural frequency, o,; (c) The damped frequency, @...
19 Aug 2020State briefly the advantages and disadvantages of increasing the number of isolation valves in a water distribution network.
19 Aug 2020What is the main flow driving force for rain drainage systems?
19 Aug 2020Find the function whose graph is the parabola with vertex (1,3) and that contains the point (2,5). A hot rolled I-shaped beam, the cross section I 40a ( hot rolled steel ), simply supported at both ends, span L=4m, along the beam length there is no lateral bearing support, at th...
19 Aug 2020A high-velocity water jet nozzle has 0.02 m and 0.0001 m as its inlcl and outlet diameters, respectively. Water discharges from the nozzle at a rate of 0.0060 kg/s. If the outlet pressure is 0.2 MPa, determine the pressure at the inlet, assuming the flow to be isothermal. 2 L
19 Aug 2020Ing edge of the plate, x. Express these variables in dimensionless form. 7.13 If an object is light enough it can be supported on the surface of a fluid by surface tension. Tests are to be done to investigate this phe- nomenon. The weight, W, supportable in this way depends on th...
19 Aug 2020A soymilk maker is a small kitchen appliance which automatically cooks soymilk, a non-dairy beverage made from soybeans. Soymilk makers work similarly to a combination of a home blender and an automatic coffee maker. Figure Q4 shows the components of a typical soymilk maker. Indi...
19 Aug 2020There are different types of stainless steels, among which the precipitation-hardened martensitic stainless steel has the highest strength.Explore how the phenomenon of peak aging and over aging occurs, and why the size of the precipitates has a great impact on the strength and o...
19 Aug 2020As shown in Fig. 4, the planet wheel A is driven by a fixed torque M with an angular velocity ~ and contacts with a fixed ring wheel B at an instantaneous point of tangency P. If the planet wheel A has a mass of m, and a radius of R, and the crank has a mass of m, and a length of...
19 Aug 2020There are different types of stainless steels, among which the precipitation-hardened martensitic stainless steel has the highest strength.Use one example to illustrate the application of precipitation-hardened martensitic stainless steel and discuss the critical challenges in th...
19 Aug 2020Engineering materials are often placed in various service conditions, such as different status of mechanical stresses and temperatures.Suggest two types of tests to illustrate how to estimate the lifetime or cycles of the engineering materials under different service conditions.W...
19 Aug 2020A fluid flows through a steady-flow open system at the rate of 3 kg/s. At the system inlet, the pressure, velocity, and internal energy are 5 atm, 150 m/s, and 2000 kJ/kg, respectively, and the specific volume is 0.4 m/ks. The fluid leaves the system with 1.2 atm, 80 m/s, an inte...
19 Aug 2020Engineering materials are often placed in various service conditions, such as different status of mechanical stresses and temperatures.High-temperature alloys (or superalloys) are an exceptional class of engineering materials for the applications at elevated temperature. Discuss ...
19 Aug 2020We would like our second order system to have a step response with an overshoot,
19 Aug 2020Suppose a system, as shown in the block diagram of a unity feedback loop, below, has a transfer function, P(s) = - 7. We want to stabilize this system with a proportional S23s-1 integral (PI) controller, such that the poles of the characteristic equation are to be: S1 = S2 = 53 =...
19 Aug 2020Figure Q-3 below, shows a block diagram of unity feedback system with controller transfer function, C(s), disturbance, W(S), and plant transfer function, P(s). Determine a) The transfer function Tr(s) = Y(s)/R(s); [12 pts.] b) The transfer function, E(S)/R(S); [10 pts.] c) The Tr...
19 Aug 2020The diameter of an axle of installation gear is 80mm, the width B of hub of the gear is 110mm, the material of gear and axle is steel, the torque that joint transmits is 800NM . The accuracy of the gear is level 8. In work there is light impact. Try to select the key joint and ca...
19 Aug 2020In the Figure below, let C=7C. If the preload is F-4000N and the additional axial load is F=6000N, what are the resultant tension in the bold and the compression in the members? (20Marks). force AFF arctg Bolt deforming
19 Aug 2020