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Engineering Science Question Paper
Engineering Science
Course:
Institution: Nyeri Technical Training Institute question papers
Exam Year:2010
Nyeri Technical Training Institute
End Of Stage II Examination
May-July 2010
Mvm/Mac 09
Engineering Science
Time 1 HR 30 MIN
Instructions
•This paper contains THREE questions
•Attempt All the questions
•Maximum marks for all sections are indicated
1 (a) The final drive gear of a motor vehicle was tested . Input torque was 40 NM when the output torque was 140 Nm, the input torque was the increased to 120Nm and the output torque increased to 540 Nm . The velocity ratio of the drive is 5:1
Determine
(a) the law of the drive.
(b) the output torque, when input torque is 90 Nm.
(c) The efficiency at the first load.
(15 marks)
(b) In a different wheel and axle arrangement, the wheel has a diameter of 650 mm while the axle diameters are 150 mm and 225 mm respectively. The efficiency while an effort 8 KN is applied to lift load is 42%. Determine the value of the load.
(5 marks)
2 (a) i ) State the principal of moments.
(ii) Define a resultant force.
(5 marks)
(b) Determine the resultant moment on the tightening arrangement of a nut radius 200 mm and length 400 mm and 250 respectively.
(5 marks)
(c) State the
(i) parallelogram of force rule.
(ii) triangle of force rule
d) Explain and determine graphically the magnitude and direction of resultant force and equilibrium force.
angles are 40° , 30° and forces 8 kN ,4 KN, 10 KN, 6 KN.
(10 marks)
3 a) State the principal of concurrency.
(2 marks)
b) With and of sketches explain bow''s notation.
(6 marks)
c) A uniform trapdoor 2 m long weighing 450 N, is shown and is hanged at one and is supported when open by a rope over a pulley. The door makes an angle of 30° to the floor.
Determine
i) the tension in the rope.
ii) the reaction at the hinge
(9 marks)
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