the Figure below, let C =7Co, If the preload is Fo=4000N and the additional axial load is F = 6000N, what are the resultant tension in the bolt and the compression in the members? (20Marks). force AF arctgC Bolt deforming
19 Aug 2020The pressure P (kPa), volume V (litres) and temperature T (in Kelvin) of a mole of an ideal gas is related by the equation: PV = 8.31T. Find the rate at which the volume is changing when the temperature is 315 K and increasing at a rate of 0.05 K/s and the pressure is 17 kPa and ...
19 Aug 2020A steel has an endurance limit 0-1 = 500 MPa, G 800 MPa, yielding strength o, -900MPa. A component made with the steel takes a fluctuating stress, whose stress ratio r=0.4, maximum stress mas = 500 Mpa, combined influence factor K=1.1. (20 Marks). a) Draw the broken-line simplifi...
19 Aug 2020The v-belt transmission power P=7.5kw, the belt speed V=15m/s. The tension of the tight side is twice that of the loose side, namely F1=2F2. Try to find the tension of the tight side F1, the effective tension Fe and the initial tension FO.
19 Aug 2020The diameter of an axle of installation gear is 80mm, the wiu on gear is 80mm, the width B of hub of the gear is 110mm, the material of gear and axle is steel, the torque thal joint transmits is 800NM. The accuracy of the gear is level 8. In work, (20 Marks) Shaft Diameter >88–65...
19 Aug 2020A steel has an endurance limit strength 6 = 900MP2. A component ma stress, whose stress ratio as an endurance limit az = 500 MP2, 0 = 800 MPa, yielding ose stress ratio r=0.4, maximum stress mu = 500 Mpa, combined influence factor K=1.1. (20 Marks). a) Draw the broken-line simpli...
19 Aug 2020A rod with a cross-sectional area of A and loaded in tension with an axial force of P =4000 lbf undergoes a stress of 0 = P/A. Using a material strength of 48 kpsi and a design factor of 2.0, determine the minimum diameter of a solid circular rod. According to the table blow, sel...
19 Aug 2020A rod with a cross-sectional area of A and loaded in tension with an axial force of P =4000 lbf undergoes a stress of 0 = P/A. Using a material strength of 48 kpsi and a design factor of 2.0, determine the minimum diameter of a solid circular rod. According to the table blow, sel...
19 Aug 2020In the Figure below, let C If the preload is F-4000 and additional axial load is F 6000N, what are the resultant tension in the bott and the compression in the members? (20Marks). force AF AF arctgc. Bolt deforming
19 Aug 2020Check the welded strength of the weld connection under static load F and N: (20 marks) 2. Check the bolted strength of the bolt connection under static load F and N: (20 marks) .We suppose that all the plates are safety. Other calculating conditions are as shown below: S -160N/ m...
19 Aug 2020Data from a viscometer suggest the following: Shea r stress (Pa) 1.72.74.86.5 Shear rate (S-) 200300470600 Is this a Newtonian behavior? If not, then what type of behavior might it be?
19 Aug 2020An alloy steel plate is subjected to a tensile stress of 120 MPa. The fracture toughness of the materials is given to be 45 MPa Vm. Determine the critical crack length to assure the plate will not fail under the static loading condition (assume Y= 1). Consider the same plate unde...
19 Aug 2020The v-belt transmission power P-7.5kw, the belt speed V=15m/s. The tension of the tight side is twice that of the loose side, namely F1=2F2. Try to find the tension of the tight side F1, the effective tension Fe and the initial tension FO.
19 Aug 2020UNA KS). force aretge, arctgco Bolt deforming
19 Aug 2020A pressure vessel has an internal diameter of I mand is to be subjected to an internal pressure of 2.75 N/mm above the atmospheric pressure. Considering it as a thin cylinder and assuming efficiency of its riveted joint to be 79%, calculate the plate thickness if the tensile stre...
19 Aug 2020A pressure vessel has an internal diameter of 1 m and is to be subjected to an internal pressure of 2.75 N/mm² above the atmospheric pressure. Considering it as a thin cylinder and assuming efficiency of its riveted joint to be 79%, calculate the plate thickness if the tensile st...
19 Aug 20201. L = 1 m; To = 0 °C; AT/dx1 = 0 at x = L; n = 24 (# of interior nodes); h = 0.01/m. To=25°C; p = 980** C = 490 and k = 54 W/(m-K). Initially, the thin rod is at 200 °C. dat Governing Equation: amah(T. – T) = 0 Approximate the interior Temperature Distribution using ODE method t...
19 Aug 2020Number of grid points are given on the figure. Approximate the temperature distribution using the governing equation and given Boundary Conditions. Use Explicit and Implicit Methods for the approximations. Tleft = 75 °C; Tright = 100 °C; Ttop = 300 °C; Tbottom = 50 °C, initially ...
19 Aug 2020What is relative acceleration of the point A, that moves along the rim of the disk with a constant velocity vr? The disk rotates in a plane of sketch about point O. 5.3 0; 5.4 ER
19 Aug 2020WOA = 00, OA = a. Velocity of the point B at given position of the mechanism is: OB = 2004; 4.3 ub=00a; R= 12000; 4.4 v =0. 4.2
19 Aug 2020A 2-m cantilever beam ABC, of uniform cross section is fixed at point C and supported at point A. The beam is subjected to a uniformly distributed load of 24 kN/m over the whole span and a concentrated load of 30 kN at point B as shown in Figure 3. Determine: (a) (b) (25 marks) (...
19 Aug 2020A gas turbine and some data are givin in the following figure. The pressure ratio is 20, the mass rate is 3.5 kg/s Take Cp=1.05 KJ/kgk and y=1.4.Determine: a) Peressure after compressesor P2=? b) Temperature after compressesor Ty=? c) Worke done by compressesor W=? d) The heat ta...
19 Aug 2020What is relative acceleration of the point A, that moves along the rim of the disk with a constant velocity ur? The disk rotates in a plane of sketch about point O. 5. 5.1 o2R; 5.3 0; 3) 5.2 5.4 ER.
19 Aug 2020Think about environment and care for the future METRO NEWS Wednesday, 7 Feb 2018 THE country has stopped importing and producing HCHC based air-conditioners. This is in line with the Montreal Protocol, said Malaysian Air-conditioning & Refrigeration Association (Macra) president ...
19 Aug 2020Discuss in detail the safety classification, global environmental properties and physical properties of refrigerants. Based on the above factors, explain the selection criteria of a refrigerant for an air-conditioning system.
19 Aug 2020A gas turbine and some data are givin in the following figure. The pressure ratio is 20, the mass rate is 3.5 Kg/s Take Cp=1.05 KJ/KgK and v=1.4. Determine: a) Peressure after compressesor P2=? b) Temperature after compressesor T2=? c) Worke done by compressesor Wc=? d) The heat ...
19 Aug 2020Rewrite the following in terms of the unit Laplace transform. piecewise continuous function f(t) step function. Then find its f(t) = 0 3 2 t² te "2, t> Answer; aşte" (eve 30).
19 Aug 2020problem Solve the initial value [3y - 2y = hlt) where ly(o)=1 oso, osts 6 h(t) = 3 [ 5. t» 6 Answer; pst ostab - 2 (5 et 2) ezt , təb
19 Aug 2020problem Solve the initial value y 3y 2y = 8 (-3), (0)=2, 460)=-2 Answer; y = Uz (t) elt-3) – Ug (t) & 2 (4-3) 2 et y(t) = szet 4-5 zet t3.
19 Aug 2020Solve the initial value problem y(t) = cost g(7), cos (t-T) dT y(o)=1 by means of Laplace transforms. Answer; 1 t 1
19 Aug 2020Solve the initial value problem x(t) – 2y(t) = 4t, y74) 2y () – Lx (t) = -61-2, x 10) = 4, y (0)=-5 Answer; x (t) = 3 e 4t ezt y (t) = -beut 2 2t
19 Aug 2020A square plate of pure aluminum (k = 231 W/(m-°C), p = 1033 J/(kg-K), p=2702 kg/m) has 0.5 m on a side and 20 mm thick which is initially at 327 °C and is suspended in a large room. The walls of the room are maintained at 27 °C, as is the enclosed air. If the surface emissivity o...
19 Aug 2020A gas mixture at 1500 K with the molar analysis 10% CO2, 20% H2O, 70% N2 enters a waste-heat boiler operating at steady state, and exits the boiler at 600 K. A separate stream of saturated liquid water enters at 25 bar and exits as saturated vapor with a negligible pressure drop....
19 Aug 2020Air at 20 °C with a free stream velocity of 8 m/s is used to cool electronic devices mounted on a printed circuit board. Each device of 5 mm x 5 mm dissipates 75 mW which is transferred by convection from the top surface. Estimate the surface temperature of the mid-point of fifth...
19 Aug 2020A 20 mm-diameter of transmission line has an electrical resistance of 1x104 ohm/m and is transmitting a current of 1000 A. Determine: (i) the surface temperature if the ambient air at 20°C and 10 m/s is in cross flow over the transmission line; and 5187415 Re 0.62 Rey2 Pr1/3 Give...
19 Aug 2020A cubical box is 1 m on a side. The top surface is maintained at 110 °C and has an emissivity of 0.8 while the bottom surface is maintained at 45 °C and has an emissivity of 0.6. The four sides have an emissivity of 0.7. Two sides opposite each other are maintained at 75 °C, whil...
19 Aug 2020MAKE UP ASSIGNEMNT ENR 302 1. Air at 20°C and 1.013 bars flows over a flat plate at 40m/s. This plate is 1mlongand is maintained at 60°C. Assuming unit depth, calculate the heat transfer from the plate. Use the following correlation: NuL = (Pr) 0.33 [0.037 (Red) 0.8 - 850]
19 Aug 2020Sustainable Manufacturing This section contains long answe Answer all Questions 9 answer questions relating to sustainable manufacturing. Question No: 5 (15 Marks) The words sustainable and green are and green are often used interchangeably. Using suitable examples and references...
19 Aug 2020Two co-axial parallel circular disks are separated by 0.3 m apart. The radius of top disk, 0.45 m is maintained at 1000 K and has an emissivity of 0.9 while the radius of bottom disk, 0.6 m is maintained at 400 K and has an emissivity of 0.7. The disks are exposed through the ope...
19 Aug 2020Two co-axial parallel circular disks are separated by 0.3 m apart. The radius of top disk, 0.45 m is maintained at 1000 K and has an emissivity of 0.9 while the radius of bottom disk, 0.6 m is maintained at 400 K and has an emissivity of 0.7. The disks are exposed through the ope...
19 Aug 2020A counter-flow shell-and-tube heat exchanger with 1-shell pass and 12-tube passes is used to heat water in the tubes with geothermal steam condensing at 140 °C on the shell side. The tubes are thin-walled and have a diameter of 3 cm and length of 4 m per pass. Water enters the tu...
19 Aug 2020A counterflow double-pipe heat exchanger is used to heat 1.25 kg/s of water from 35 to 80 °C by cooling an oil (cp= 2.0 kJ/kg-°C] from 150 to 85 °C. The overall heat transfer coefficient is 850 W/m²°C. A similar arrangement is to be built at another plant location, but it is desi...
19 Aug 2020In-class worked example: A marine propeller shaft of 200 mm diameter is subjected to a torque of T=126 kNm and a pure bending moment of M=157kNm. Determine the state of the stress at positions A, B, and C solution: consider an element at the positions A, B and C respectively. ben...
19 Aug 2020A hot water bath of 2 m (W) x 4 m (L) x 1.5 m (H) is maintained at a constant temperature of 40 °C and a constant water level in a room where the ambient air is at 1 atm., 20 °C and 60% relative humidity. Determine the rates of heat transfer from the top surface of the water bath...
19 Aug 2020Consider steady two-dimensional heat transfer in a long solid bar with a mesh size of Ar = Ay = 1.0 cm. Write the nodal equation for nodes 1 through 12 as shown in Figure Q9(b). h, T. T = 50°C k = 10 W/m. °C Is 16 17 18 T = 100°C h = 30 W/m2 °C 9 10 11 12 1= 150°C Too = 15 °C In...
19 Aug 2020The cross section of a triangular shape long sold bar is shown in Figure Q9(a). The surfaces A and B of the bar are maintained at 110 °C and 20 °C, respectively. Using the finite difference method for steady two-dimensional heat transfer with a mesh size of Ar= Ay=5 mm, set up th...
19 Aug 2020Force Q = 80 N and the resultant R = 120 N (). Determine the magnitude of force P and the angle e. Answers: P=58.3 N, 0 = 35.44° 25°
19 Aug 2020A pressurized cylindrical tank with fat closed ends is under an internal pressure p and also loaded by a torque and an axial tensile force F (see Fig.05). The tank has inner diameter of d-250 mm and wall thickness t = 6,5 mm. The internal pressure p = 7.25 MPa and the torque T850...
19 Aug 2020A vertical force P is applied at a distance x to the edge of the bracket as shown in Fig.04. (a) Determine the maximum and minimum normal stress in the bracket at section - when the load P-100 KN is applied at x - 300 mm. [14 marks) (b) Determine the shortest distance x to the ed...
19 Aug 2020The shown figure represents a seismic transducer used for Vibration measurement. Its base 2 is attached to the vibrating object. The seismic weight 3 of mass m is supported by the spring of stiffness k and the damper 5 of the damping coefficiente. This transducer records the disp...
19 Aug 2020