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Engineering Science Question Paper

Engineering Science

Course:

Institution: Nyeri Technical Training Institute question papers

Exam Year:2012

Nyeri Technical Training Institute
Supplementary Examination
Series: JAN 2012
MCVM 011
Engineering Science
Time : 1HR 30 MIN

INSTRUCTIONS TO CANDIDATES
This paper consists of Three questions
All questions carry equal marks
Attempt all questions.

Maximum marks for each part of a question are shown.

Q 1(a) Define the following terms and state their units of measurements:
(i) energy;
(ii)power;
(iii) work;
(iv) velocity ratio. (4 marks)

(b) A load of 2100N is lifted by a force of 170N which moves 900mm from every 30 mm moved by the load. Calculate:
(i) useful work done by the machine;
(ii) Velocity ratio;
(iii) efficiency of the machine.
(9 marks)
(c) A screw-jack has a two start thread of 5 mm pitch and an operating lever 470 mm in length. If the efficiency of the jack is 40% , calculate the load lifted by an effort of 60 N.
(7 marks)
Q2 (i) Define the coefficient of friction.
(ii) State four laws of dry friction.
(iii) State two advantages and two disadvantages of friction. (10 marks)
(b) A casting of mass 45 kg is pulled along a horizontal force of 1650N.
(i) Calculate the coefficient of friction.
(ii) Determine the force that would move the same casting if it was a pull inclined at 33° to the horizontal. (10 marks)

Q3 (a) State the principal of moments.
(10 marks)
(b) State Two conditions necessary for the equilibrium of a body acted on by a number of parallel forces: (10 marks)

Engineering Science Question Paper

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