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Engineering Science And Drawing Question Paper

Engineering Science And Drawing

Course:Diploma In Electrical Engineering (Electrical Engineering)

Institution: Kenya Power Training School question papers

Exam Year:2011

2521/103
ENGINEERING SCIENCE AND DRAWING
Oct/Nov.2010
Time: 3 hours
THE KENYA NATIONAL EXAMINATION COUNCIL
DIPLOMA IN ELECTRICAL AND ELECTRONICS ENGINEERING
(POWER)
MODULE 1
ENGINEERING SCIENCE AND DRAWING
3 hours

INSTRUCTIONS TO CANDIDATES:
You should have the following for this examination:
Answer booklet;
Mathematical table/electronic calculator;
Drawing instruments and pencils.

This paper has TWO sections: A and B.
Answer ALL questions from section A and any ONE from section B.
Maximum marks for each part of a question are as shown.

SECTION A
Answer ALL the questions from this section:
1. (a) Define the following terms and state their si units:
i. Specific heat capacity;
ii. Specific latent heat of fusion;
iii. Specific latent heat of vaporization.
6 marks
(b) An espresso coffee machine steam at 1000c is used to heat milk. If the specific heat capacity of milk is 4.0kJ/kg K and the latent heat of vaporization of steam is 2260 × 103 J/kg, calculate the:
i. Energy required to heat 250g of milk from a room temperature of 200C to 800C;
ii. Mass of condensed steam.
(c)A particular wave is given by equation y = 8.5m sin ((0.8-1) x-(5.4rad/s) t). Determine the:
i. Frequency;
ii. Period
iii. Velocity;
iv. Displacement of the wave at x=5.87m and t=2.59 sec.
8 marks
2. (a) State the principle of conservation of linear momentum.
1 mark
(b) A flywheel diameter 360mm increases its speed uniformly from 630 rev/min to 1050rev/min in 11 seconds. Calculate the:
i. Angular acceleration of the wheel in rad/sec2;
ii. Number of revolutions made during the speed change;
iii. Linear acceleration of a point in the rim of the wheel in m/sec2.
6 marks

(c) A mass of 700 kg falling 0.2m from up is used to drive a pile of mass 500kg into the ground. The pile is driven 75mm in the ground. If there is no rebound, find the
i. Common velocity of the pile and the pile hammer before the impact;
ii. Loss of kinetic energy on impact;
iii. Efficiency of the pile driving operation.
13 marks

3. (a) (i) list down any four safety rules observed in the workshop 4 marks
(ii) Outline the procedure of the “kiss of life” method as a technique for an electric shock treatment.
6 marks
(b) With an aid of a sketch, describe the following processes
i. Electroplating;
ii. Seam welding.

4. Draw the projection from the views given in figure 1.
SECTION B
Attempt only ONE question from this section.
5. (a) (I) State the assumption made in the theory of pure torsion.
(ii) Show from first principles that when a circular shaft is subjected to pure torsion the shear stress induced is proportional to radius.
11 marks
(b) A hallow steel shaft has external and internal diameter of 100mm and 62.5 mm respectively. When transmitting power it is observed to twist through an angle of 1.80 over a length of 3m. The modulus of rigidity of the steel is 85kN/mm2.
Determine the:
i. Maximum shear stress induced in the material by the torque transmitted.
ii. Power transmitted by the shaft when it is revolving at 180 rev/min.
9 marks

6. (a) Differentiate between nuclear fission and fusion. 3 marks
(b) Explain the term isotope and list two examples. 3 marks
(c)Explain the merit s and demerits of nuclear power generation over other sources of power. 6 marks

(d) Ice at 00c is added to 300 g of water at initial temperature of 800C in a vacuum flask. When 120 g of ice has been added and all melted the temperature of the flask and its contents is 400C. When a further 100 g of ice has been added the final temperature becomes 100C. The specific capacity of water is 4200J/kg K. calculates the specific latent heat of fusion of ice. (Neglect any heat lost to the surrounding).
8 marks
7. (a) State any three factors which affect the current carrying capacity of a cable. 3marks

(b)Outline four precautions to be observed in order to avoid being struck by lightning.
4 marks.
(c)Explain the following properties of engineering materials:
i. Hardness;
ii. Resistivity
iii. Electrical conductivity
4 marks
(d) With an aid of a sketch, explain the rightward welding technique and state any two of its advantages. 7 marks
8. An ellipse has the major axis measuring 110 mm and the minor axis measuring 70mm. by using the rectangular method, draw the ellipse. 10 marks

(b) (I) construct a triangle whose perimeter is 180 mm and the three sides are in the ratio of 3:5:7.
(ii) Inscribe a circle on the triangle drawn in 8 (b) (i) 10 marks

Engineering Science And Drawing Question Paper

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