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B) Determine the rivet value of 18 mm diameter power driven field rivet when it is used to connec...
2. A square threaded power screw is used for a machine tool. The screw has 75 mm external diameter and 12 mm pitch. The operating nut takes the axial load of 550 N on a flat surface of 70 mm and 1...
2. A square threaded power screw is used for a machine tool. The screw has 75 mm external diameter and 12 mm pitch. The operating nut takes the axial load of 550 N on a flat surface of 70 mm and 105 mm internal and external diameters respectively If the coefficient of friction is 0.16 for all contact surfaces on the nut, determine the power required to rotate the operating nut when the cutting speed is 7.5 m/min. Also find...
18[E]) When a power source like a battery is connected to a circuit, an electric field...
18[E]) When a power source like a battery is connected to a circuit, an electric field pushes electrons within the conducting wires causing them to flow. The electric field exists due to an uneven build up of charge on the surfaces of the wires (called a surface charge gradient). In this set of problems we will explore a simple model of how this all comes about and emphasize the connection between source charges, electric fields, and voltage differences in the...
1. 1.08x106 grams/h of a superheated fluid flows through a pipe in a power plant. The...
1. 1.08x106 grams/h of a superheated fluid flows through a pipe in a power plant. The pipe is 1000 cm long, has an inner diameter of 0.05m and a wall thickness of 0.6 cm. The pipe has a thermal conductivity of 0.0017 kW/mK, and the inner pipe surface is at a uniform temperature of 393K. The temperature drop between the inlet and exit of the pipe is 7K, and the constant pressure specific heat of vapor is 2190 J/kgK. If...
please solve the multiple choices [17-18-19-20] (a) What kind of rotor construction is used in this machine? Cylindrical or salient pole rotor? Why? (b) The field current and the mechanical in...
please solve the multiple choices [17-18-19-20]
(a) What kind of rotor construction is used in this machine? Cylindrical or salient pole rotor? Why? (b) The field current and the mechanical input power are adjusted so that the machine delivers 15 k W at 0.9 lagging power factor. Is it a generator or motor? Draw the per- phase equivalent circuit of machine. (c) Determine the excitation voltage and the power angle (degree) Problem 1. (10 Points) A 3-phase, 20 kVA, 460...
In the circuit shown in the diagram below, two thick wires connect a 1.4 volt battery...
In the circuit shown in the diagram below, two thick wires connect a 1.4 volt battery to a Nichrome (NIC) wire. Each thick connecting wire is 14 cm long, and has a radius of 9 mm. The thick wires are made of copper, which has 8.35+28 mobile electrons per cubic meter, and an electron mobility of 0.00434 (m (V/m). The Nichrome wire is 8 cm long, and has a radius of 4 mm. Nichrome has 9e+28 mobile electrons per cubic...
Figure 1 shows the layout of countershaft used to transmit power to a blower through a...
Figure 1 shows the layout of countershaft used to transmit power to a blower through a pulley drive (4-5). Pulley (driving sheave) 4 has a diameter of 125-mm and pulley (driven sheave) 5 has a diameter of 75 mm. Pulley 5 is mounted vertically below pulley 4 (as shown in the figure). Belt tension on the loose side is 20% of the tension on the tight side. A power of 7.5 kW is transmitted via the gear set (2-3) from...
CENTRE INDEX NUMBER SECTION B 30 marks] Calculate the discharge through a pipe of diameter 200...
CENTRE INDEX NUMBER SECTION B 30 marks] Calculate the discharge through a pipe of diameter 200 mm when the difference of pressure head between the ends of the pipe 500 m apart is 4 m of water. Take the value off= 0.009 in the formula hl= a) 19.5e/s b)2.0es e)03 m's d) 29.3 e/s 2. A scale 1:50 scale model of ship is towed through sea water at a speed of 1 ms. A force of 2 N is required...
6. Determine the setting of a centrifugal pump, given that flow rate = 2.4 m/min; diameter...
6. Determine the setting of a centrifugal pump, given that flow rate = 2.4 m/min; diameter of intake pipe = 160 mm; entrance losses = one velocity head in suction pipe; required NPSH = 42 kPa; water temperature = 30°C N D1, D2 : inlet and outlet diameters of impeller (rotor) b : impeller width 0,6 : inlet and outlet impeller vane angles (degrees) : speed of rotation of impeller (and its driver) in rpm V, V :tangential and radial...
Clearly state your solution path. Partial credit will only be given for clear steps. Units must...
Clearly state your solution path. Partial credit will only be given for clear steps. Units must be provided or points will be subtracted. Clearly label the end result, use double lines to underscore or box the final result. Note the equation sheet is on the back. (10 pt) An electron enters a region between two capacitor plates with equal and opposite charges. The plates are L=0.1 m by 0.05 m and the gap between the plates is h=0.001 m. During...
A 3 m rigid bar AB is supported with a vertical translational spring at A and a pin at B The bar is subjected to a linearly varying distributed load with maximum intensity g Calculate the ver...
A 3 m rigid bar AB is supported with a vertical translational spring at A and a pin at B The bar is subjected to a linearly varying distributed load with maximum intensity g Calculate the vertical deformation of the spring if the spring constant is 700 kN/m. (ans: 21.43 mm) 2. A steel cable with a nominal diameter of 25 mm is used in a construction yard to lift a bridge section weighing 38 kN. The cable has an...
2. A square threaded power screw is used for a machine tool. The screw has 75 mm external diameter and 12 mm pitch. The operating nut takes the axial load of 550 N on a flat surface of 70 mm and 105 mm internal and external diameters respectively If the coefficient of friction is 0.16 for all contact surfaces on the nut, determine the power required to rotate the operating nut when the cutting speed is 7.5 m/min. Also find...
please solve the multiple choices [17-18-19-20]
(a) What kind of rotor construction is used in this machine? Cylindrical or salient pole rotor? Why? (b) The field current and the mechanical input power are adjusted so that the machine delivers 15 k W at 0.9 lagging power factor. Is it a generator or motor? Draw the per- phase equivalent circuit of machine. (c) Determine the excitation voltage and the power angle (degree) Problem 1. (10 Points) A 3-phase, 20 kVA, 460...
In the circuit shown in the diagram below, two thick wires connect a 1.4 volt battery to a Nichrome (NIC) wire. Each thick connecting wire is 14 cm long, and has a radius of 9 mm. The thick wires are made of copper, which has 8.35+28 mobile electrons per cubic meter, and an electron mobility of 0.00434 (m (V/m). The Nichrome wire is 8 cm long, and has a radius of 4 mm. Nichrome has 9e+28 mobile electrons per cubic...
Figure 1 shows the layout of countershaft used to transmit power to a blower through a pulley drive (4-5). Pulley (driving sheave) 4 has a diameter of 125-mm and pulley (driven sheave) 5 has a diameter of 75 mm. Pulley 5 is mounted vertically below pulley 4 (as shown in the figure). Belt tension on the loose side is 20% of the tension on the tight side. A power of 7.5 kW is transmitted via the gear set (2-3) from...
CENTRE INDEX NUMBER SECTION B 30 marks] Calculate the discharge through a pipe of diameter 200 mm when the difference of pressure head between the ends of the pipe 500 m apart is 4 m of water. Take the value off= 0.009 in the formula hl= a) 19.5e/s b)2.0es e)03 m's d) 29.3 e/s 2. A scale 1:50 scale model of ship is towed through sea water at a speed of 1 ms. A force of 2 N is required...
6. Determine the setting of a centrifugal pump, given that flow rate = 2.4 m/min; diameter of intake pipe = 160 mm; entrance losses = one velocity head in suction pipe; required NPSH = 42 kPa; water temperature = 30°C N D1, D2 : inlet and outlet diameters of impeller (rotor) b : impeller width 0,6 : inlet and outlet impeller vane angles (degrees) : speed of rotation of impeller (and its driver) in rpm V, V :tangential and radial...
Clearly state your solution path. Partial credit will only be given for clear steps. Units must be provided or points will be subtracted. Clearly label the end result, use double lines to underscore or box the final result. Note the equation sheet is on the back. (10 pt) An electron enters a region between two capacitor plates with equal and opposite charges. The plates are L=0.1 m by 0.05 m and the gap between the plates is h=0.001 m. During...
A 3 m rigid bar AB is supported with a vertical translational spring at A and a pin at B The bar is subjected to a linearly varying distributed load with maximum intensity g Calculate the vertical deformation of the spring if the spring constant is 700 kN/m. (ans: 21.43 mm) 2. A steel cable with a nominal diameter of 25 mm is used in a construction yard to lift a bridge section weighing 38 kN. The cable has an...
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