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Adivhaho muremi
Questions (38)
Figure 5.13 Simple epicyclic gear consisting of a sun gear and three other gears
Refer to Figure 5.13, which shows a simple
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12 views
The compound gear system of a reduction gearbox is shown in FIGURE 2 and consists of an input gear A with 68 teeth rotating at
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QUESTION 5
The following specifications apply to a simple gear train with a pinion A and a gear wheel B: Module = 3,5 mm Pressure
1 answer
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The plunger of a three-cylinder pump has a diameter of 300 mm and a stroke length of 510 mm at a pressure of 850 kPa.
Determine
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The volume of helium gas at 10 °C and at a pressure of 750 kPa is 0,42m. The gas constant is 2,08 kJ/kg •K.
Calculate the mass
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4.2
The volume of a certain gas at a temperature of 32 °C and a pressure of 0,15MPa is 39 m?. If the temperature stays at 32 *C
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The density of 1 m3 mercury at 0 °C is 1,07 x 104 kg/m3 and the volumetric coefficient of expansion is 200 x 10 -6/°C.
Calculat
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2.3
A water pump delivers 12,5 litres of water per stroke if the effective force on the piston is 27 kN. The diameter of the
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20 views
A hydraulic accumulator must work under a pressure of 2 MPa.
Calculate the mass needed for it to act under the pressure of 2 MPa
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18 views
A single-acting hydraulic press has a plunger diameter of 55 mm, a stroke length of 106 mm and a ram diameter of 144 mm.
2.1.1
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What temperature if 1kg mixing 3 kg of water at 20°C with 10 kg water at 60°C will produce?
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Explain the three methods of heat transfer.
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4.2 A vessel of air with a volume of 0.25 m° at a pressure of 1.4 MPa, begin compressed to a pressure of 2.0 MPa, Caculate
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A beam ABCDE, with A on the left is 7 m long and simply supported at B and E.
The lengths of the various portions are as follows:
1 answer
19 views
2.1
2.2 Define the unit Pascal. The plungers of three-cylinder, single-acting pump have diameters of 6 cm each and a stroke
1 answer
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steam plant operating on the Rankine cycle is supplied by a solar plant with a solar collector area of 40 000 m2. The plant
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A solar plant with a PV system has an average solar irradiance for the region of 1 kW/m?. The plant is in operation for 16 hours
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A single-stage, three-cylinder piston air compressor with a diameter of 180 mm and a stroke length of 2500 mm per cylinder runs
1 answer
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QUESTION 3
A single-acting, single-cylinder air compressor has a clearance volume which is 6% of the stroke volume. The air is
1 answer
14 views
A gas of standard temperature and pressure (STP) has a mass of 1,1 kg. The gas undergoes an isothermal process to 780 kPa. Take
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1. A single acting reciprocating air compressor has a stroke length of
300 mm and a diameter of 200 mm. The air is drawn in at a
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32 views
Calculate the force exerted by the ram piston if an effort of 200 N is applied to the lever of a hydraulic press.
The mechanical
1 answer
18 views
Find the smallest diameter bolt that can be used in a clevis if the shearing strength of
the bolt is 400 MPa and F = 380 kN.
1 answer
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Calculate the force required to punch a 15 mm diameter hole into a plate 20mm thick, if the shear strength is 300 MN/m.
1 answer
14 views
A glass flask is filled with 35 cm' mercury at a temperature of 20 °C. The temperature is increased to 50 °C. The linear
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9 views
A square metal plate with sides 2,5 m long and at a temperature of 32 °C has a hole with a diameter of 850 mm in the centre.
1 answer
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12. A steel ball has a diameter of 60 mm and is 0,01 mm too large to pass through a hole in a brass plate when the ball and the
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2.
4,54 kg gas is compressed at a constant temperature of 432 K from 103,4 kPa to 3 102 kPa. The gas constant R is 0,3 kJ/kg.K.
1 answer
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1. Calculate the work done when 1,36 kg of gas is compressed isothermally from 138 kPa to 1 380 kPa. Isothermal temperature is
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7. The temperature of a right rectangular prism of carbon steel with dimensions
70 × 130 x 10 mm is increased by 45 °C. The
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6. A piece of wire, original length 120 mm, is heated from 20 °C to 95 °C. If the final length of wire is 120,324mm .
1 answer
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A metal plate is a 1m square at 283K. There is a hole of 600mm in diameter in the centre. The linear coefficient of expansion of
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12 views
Supply water at a temperature of 32 °C is fed into a boiler working at a pressure of 2 200 kPa. The steam is superheated to a
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A gas of 1 kg mass is expanded polytropically from an initial pressure of 1 300 kPa and a temperature of 250 °C until it
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Heat is added to a cylinder that contains air at with an absolute pressure of 200 kPa and a temperature of 27 °C. The initial
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18 views
A 60-mm diameter shaft is connected to a vehicle transmission by means of a splined connection. The number of splines cut into
1 answer
32 views
A model boiler must be built for Matimba Power Station, which is one of the major
electricity-generating power stations in South
2 answers
16 views
Calculate the torque to increase the speed of a flywheel with a mass of 1 300 kg and a radius of gyration of 810 mm from 110
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28 views
Answers (1)
Data: t = 10 mm; n = 2; p = 60 mm; o+ = - 300 - МРа = 105 МРа ; т = — МРа = 75 МРа 0c = 600 - MPa = 150 MPa d = 20mm 4 Solution: 1.1 The efficiency of the joint: F+ = (p - d)to+-p = (60 - 20)(10) (105) = 42 kN Fs=Fa7TR=(20) (75) (2) = 47,124
