# Maritime Engineering Exam Ethiopia

## Full text

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### PRE-SEA TRAINING – Six months training scheme

INSTRUCTIONS TO CANDIDATES: INSTRUCTIONS TO CANDIDATES:

Read the following instructions carefully before answering Read the following instructions carefully before answering

1.

1. Check the box of the most correct answer for each question. Separate papers will not beCheck the box of the most correct answer for each question. Separate papers will not be provided. If you change your mind, strike through the wrong answer and check another. provided. If you change your mind, strike through the wrong answer and check another. 2.

2. Ensure to enter your name and reference/register number in the space provided for the same.Ensure to enter your name and reference/register number in the space provided for the same. 3.

3. Any candidate found indulging in any malpractice will be debarred from the test and will notAny candidate found indulging in any malpractice will be debarred from the test and will not be considered for admission.

be considered for admission. 4.

4. Mobile Phones are prohibited in the Examination Hall.Mobile Phones are prohibited in the Examination Hall. 5.

5. You may Use scientific calculator only.You may Use scientific calculator only.

Name

Name of of Candidate Candidate (in (in block block letters) letters) ________________________________________________________________________

Reference Number: Reference Number:

Signature:

Signature: ____________________ ____________________ Date: Date: ____________________________________

### A

MathematicsMathematics

### B

Industrial ChemistryIndustrial Chemistry

### C

Basic Engineering & Mechanical ScienceBasic Engineering & Mechanical Science

### D

ThermodynamicsThermodynamics

### E

Electrical EngineeringElectrical Engineering

### 0

Name of Examiner: ______________________ Name of Examiner: ______________________ Signature of Examiner: __________________ Signature of Examiner: __________________ Date: Date: ______________ ______________

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SECTION- A

Mathematics (4 x 5 = 20 points)

1. The solutions to the following equation are:

3

2 + −

3

− =

a)

1 =

2 =

b)

1 =

2 =

c)

1 =

2 =

d)

1 =

2 =

### 2

2. The solutions to the following equation are:

2 −

=

a)

− b)

− c)

− d)

### 1.5 , 6

3. The sum of two positive numbers is 24. which numbers will give the maximum result, if one of them will be multiplied with the square of the other:

a)

b)

c)

d)

### 12;12

4. The shaded area in the following drawing is:

a) 9

b) 4.5

c) 13.5

d) 18

5. ABCDA'B'C'D' is a rectangle box with a square basis. The diagonal BD' is twice the size of the side of the basis. The angle between the diagonal BD' and the basis ABCD is:

a) 37.5° b) 60° c) 45° d) 30° 2 2

### y

= −

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SECTION - B

Industrial Chemistry(4 x 5 = 20 points)

1. When salt water is allowed to evaporate in an open container, what happens to the concentration of salt in the water?

a) It remains constant throughout the process.

b) It increases or decreases depending on the temperature of the water.

c) It decreases.

d) It increases.

2. Which of the following is a correct statement?

a) A solution of an element is an electrolyte.

b) Solutions of all acids and basics conduct electricity equally well.

c) A solution of a soluble ionic compound is an electrolyte.

d) Ethanol, C2H5OH, is a strong electrolyte.

3. Choose the aqueous solutions with the lowest PH:

a) Nitric acid , HNO3 , 0.1M

b) Acetic acid , CH3 COOH , O.4M

c) Sulfuric acid , H2SO4 , 0.1M

d) Carbonic acid , H2CO3 , 0.2M

4. What mass of NaOH (s) is required to react exactly with 25 ml of 0.3M H2SO4 (aq)?

a)

b)

c)

d)

### gr

5. Which of the following statements about corrosion is not correct?

a) Atmospheric corrosion of iron occurs very slowly in dry air, but more rapidly in the presence of moisture.

b) Iron rusts more quickly in contact with a less active metal (such as Cu) and slower in contact with a more active metal (such as Mg)

c) Iron rusts more quickly at high OH- ions concentration.

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SECTION - C

Basic Engineering & Mechanical Science(4 x 5 = 20 points)

1. A ship is sailing due east at 18 knots runs into a 3 knot  current moving

### 40

East of North. The resultant speed an direction of the ship are:

a)

b)

c)

d)

### N to E

2. A wheel and axle is carried in horizontal bearings (see sketch). When the load is allowed to fall from rest, it falls 3 m in 8seconds. If the diameter of the axle is 50 mm, The linear acceleration of the load (in m/s2 ) and the angular acceleration of the wheel (in rad/s2 )are:

a)

2

2

b)

2

2

c)

2

2

d)

2

### ; 5.625

2

3. A 3kg hammer head moving at a velocity of 7 m/s strikes the head of a wedge and is brought to rest in 1/100 s. The average force of the blow is:

a)

b)

c)

d)

### kN

4. The stiffness of a spring is 88 N/mm of axial compression. The work to increase the compression from 50 mm to 80 mm is:

(5)

5. A tie bar is made of mild steel of tensile strength 462 MN/m2 is to carry a tensile load of 11.12

kN . The minimum diameter of the bar allowing a factor of safety of 12, is:

a)

b)

c)

d)

### mm

SECTION - D

Thermodynamics(4 x 5 = 20 points) 1. The temperature inside a refrigerated cold chamber is −

### F

when the outside temperature is

### F

− 

. The temperature difference between inside and outside in degrees Celsius is:

a)

b)

c)

d)

### C

2. A casting of mass 5 kg is pulled a distance of 10 m along a horizontal floor, the coefficient of friction between the surfaces of the casting and floor being 0.4. The heat generated is:

a)

b)

c)

d)

### J

3. 2.5kg of brass of specific heat

### kgK

at a temperature of

### C

is dropped into 1.2liters of water at

### C

. The resultant temperature of the mixture is:

a)

b)

c)

d)

### J

4. A solid cast iron sphere is 150 mm diameter, density = 7.21 g/cm3, Specific heat = 0.54

kJ/kgK , coefficient of linear expansion = 1.12 x 10-5 / °C . If 2110 kJ  of heat is transferred to it, the increase in diameter is:

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5. 0.25m3 of a gas at

### C

is heated at constant pressure to a temperature of

### C

. The final volume is:

a)

3 b)

3 c)

3 d)

### m

3

SECTION - E

Electrical Engineering(4 x 5 = 20 points)

1. The total current in the following circuit is:

a)

b)

c)

d)

### A

2. The reading on the Voltmeter in the following circuit is:

a)

b)

c)

d)

### V

3. A battery consists of 4 cells in series, each of e.m.f 1.5 V and internal resistance 0.6 Ω. If the battery is connected to two resistors of 2 Ω and 0.6 Ω which are connected in series. The circuit current is:

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4. A 220 V diesel-driven generator is required to supply the following on full load: a) Lighting one hundred 100 W and two hundred 60 W lamps, b) a heating load of 25 kW, c)

Miscellaneous small loads taking a total current of 30 A. If the generators efficiency is 85%, the required power output of the diesel engine is:

a)

b)

c)

d)

### kW

5. An iron-cored coil of 2000 turns produced a magnetic flux of 30 mWb when a current of 10 A is flowing from the D.C. supply. If the time of opening the supply switch is 0.12 seconds and the residual flux of the iron is 2 mWb, the average value of the induced e.m.f. is:

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## References

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