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The client requires a single step-up spur gearbox to transmit a 10 kW power from a shaft rotating at 1000 rpm, while the output speed must be 1700 rpm. The material for gear and pinion is 817M40 and 655M13, respectively. Use table 6.10 on page 128 to select the suitable gear and pinion. 1.1 Briefly state the problem.2 State the design specification considering the following design factors: 1. Functionality 2. Stress.3 State formula and standards relevant to the single step-up spur gearbox design.
QUESTION 1 GEARS [50]
The client requires a single step-up spur gearbox to transmit a 10 kW power from a shaft rotating
at 1000 rpm, while the output speed must be 1700 rpm. The material for gear and pinion is 817M40
and 655M13, respectively
The client requires a single step-up spur gearbox to transmit a 10 kW power from a shaft rotating at 1000 rpm, while the output speed must be 1700 rpm. The material for gear and pinion is 817M40 and 655M13, respectively. Use table 6.10 on page 128 to select the suitable gear and pinion. 1.1 Briefly state the problem.2 State the design specification considering the following design factors: 1. Functionality 2. Stress.3 State formula and standards relevant to the single step-up spur gearbox design.4 If the pinion has 20 teeth, use the Lewis formula to determine the face width of the pinion and gear. Then, do one set of calculations and tabulate the answers.5 Conclusion
QUESTION 1 GEARS [50]
The client requires a single step-up spur gearbox to transmit a 10 kW power from a shaft rotating at 1000 rpm, while the output speed must be 1700 rpm. The material for gear and pinion is 817M40 and 655M13, respectively. Use table 6.10 on page 128 to select the suitable gear and pinion.
1.1 Briefly state the problem. (3)
1.2 State the design specification considering the following design factors: 8) 1. Functionality
2. Stress
1.3 State formula and standards relevant to the single step-up spur gearbox design. (4)
1.4 If the pinion has 20 teeth, use the Lewis formula to determine the face width of the (33) pinion and gear. Then, do one set of calculations and tabulate the answers.
1.5 Conclusion. (2)
The client requires a single step-up spur gearbox to transmit a 10 kW power from a shaft rotating at 1000 rpm, while the output speed must be 1700 rpm. The material for gear and pinion is 817M40 and 655M13, respectively. Use table 6.10 on page 128 to select the suitable gear and pinion. 1.1 Briefly state the problem.2 State the design specification considering the following design factors: 1. Functionality 2. Stress.3 State formula and standards relevant to the single step-up spur gearbox design.4 If the pinion has 20 teeth, use the Lewis formula to determine the face width of the pinion and gear. Then, do one set of calculations and tabulate the answers.5 Conclusion.
A station supplies 250KVA at a lagging power factor of 0.8. A synchronious motor is connected in parallel with the load. If the combined load is 250KW with a lagging P.F of 0.9, determine:
1. The leading KVAR taken by the motor
2. The KVA rating of the motor
3. P.F at which the motor operates
QUESTION 3: [25]
A [a] m x [b] m double-pane window consists of two [c]-mm-thick layers of glass
(k = [d] W/m·K) that are separated by a [e] mm air gap (kair = [f] W/m·K). The heat flow
through the air gap is assumed to be by conduction. The inside and outside air
temperatures are [g]°C and [h]°C, respectively, and the inside and outside heat
transfer coefficients are [i] and [j] W/m2
·K.
3.1) Draw a representation of the setup with the thermal resistance network (5)
3.2) Determine the daily rate of heat loss through the window in steady operation. (15)
3.3) Calculate the temperature difference across the largest thermal resistance. (
the tensions of a flat belt are;right side 800n and slack side 300n. the angular speed n and diameter d of the pulley are 400 rev/min and 30cm respectively. if the coefficient of friction between the belt and the pulley is 0.7 and the mass of the belt is 2.1kg/m,including centrifugal tension, determine (a) initial tension of the belt (b) angle of lap in degrees (c) power transmitted (d) maximum power)
People living nearby have specific concerns about two operations carried out at the factory:
■ Stamping, which is a noisy process
■ Plating, which uses cyanide and is therefore perceived as a deadly process by some residents.
The company has decided to make a presentation to the local residents association explaining how it complies with legislation and demonstrating its good ‘green credentials’, particularly in respect of discharging waste water from the onsite treatment plant into a nearby culvert which runs down to a river.
Make a list of generic constraints that impact on engineering businesses.
With respect to the two main concerns of residents (Stamping and Plating), identify the key pieces of legislation which could apply here.
A soldering iron has a cylindrical tip of 2.5 mm in diameter and 20 mm in length. With
age and usage, the tip has oxidized and has an emissivity of [a]. Assuming that the
average convection heat transfer coefficient over the soldering iron tip is [b] W/m2
·K,
and the surrounding air temperature is 20°C, determine the power required to
maintain the tip at 400°C.
