Assessment Brief 3 Student Name/ID Number Course BTEC HNC in General Engineering Unit Number and Title 8: Mechanical Principles Academic Year 2020/21 Unit Tutor Philip Arnold Assignment Title Number...

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Answered 3 days AfterMay 27, 2021

Answer To: Assessment Brief 3 Student Name/ID Number Course BTEC HNC in General Engineering Unit Number and...

Abhijit answered on May 31 2021
153 Votes
1.) A gearbox has an input speed of 1300 rpm clockwise and an output speed of 200 rpm
anticlockwise. The input power is 20 kW and the efficiency is 80%
Solution:
Let N1 be 1300 rpm and N2 be 200 rpm
 The gear ra
tio (GR)
GR =



 The input Torque (T1)
P1 = 20000 W (input power)
P1 = T1 [ =



]
T1 =


 The output Torque (T2)
P2 = 20000 x 0.8 W = 16000 W (output power)
P2 = T2 [ =



]
T2 =


 The holding Torque (T)
T = T2 - T1 =
2.) A Screw Jack with a square cut thread has an outer diameter of 60mm. it has a pitch
of 10 mm with an operating lever which has a length of 400mm from one end to the
center of the thread. The machine has an overall co-efficient of friction as 0.3. It raises
a load of 240 kg
Solution:
 Force required to raise the load ( )





( )
(When rising)


( )
(When coming down)
Where ( ) ( ) and (


) (


)






( )




 Work done to raise the load to 200mm
 Efficiency (raising)


( )
 The potential energy of the screw depends on the load to be lifted and the distance
it has to lift that load, since the loading does not change once it has been loaded
it’s only the distance which plays the key factor for storing potential energy (for
constant loading). However, the design factors such as coefficient of friction,
thread angle also play an important role since from the above equation it is clear
that efficiency is inversely proportional to the friction angle and thread angle
which implies less the friction angle more the...
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