ENGINEERING KNOWLEDGE (MOTOR) sample question paper

ENGINEERING KNOWLEDGE (MOTOR)

Time allowed: 3.5 hours

Six (6) questions only to be attempted

(1) Before fitting new rings to the piston of a diesel engine, what tests and checks must be

carried out to ensure that the rings will function properly? What damage may be caused

by improperly adjusted rings? What clearance is usually allowed between the butts?

(2) Describe how you would adjust the clearance between the valves and the rocker arms of 4-stroke

multi-cylinder diesel engine. Why is clearance necessary and what amount is usually given?

(3) How is the low-pressure air necessary for scavenging the cylinders of two-stroke diesel

engines obtained? Describe the different methods of scavenging systems. Explain what

can cause fires or explosions in these systems and how they can be extinguished.

(4) Describe the general location and purpose of all the auxiliary machinery, including that

required to service the main engines, found in the machinery spaces of a motor ship.

(5) State several causes of a diesel engine failing to start. Explain how you would check out

these faults and what action you would take to overcome them.

(6) Describe an air-starting valve as used on the cylinder of a diesel engine. At what part of the

cycle is air admitted to the cylinder and what regular attention do air-starting valves require?

(7) Describe a type of centrifuge or lubricating oil purifier. Explain how it operates and how

it is used in connection with diesel engines. What are the possible consequences of

operating an engine with dirty or contaminated oil?

(8) What two types of ignition systems are used in gasoline engines? List some of the

common defects found with these systems and explain the function of a distributor in

a multi-cylinder engine.

(9) Explain with reference to a diesel engine the following control terms:

(a) Closed loop;

(b) Feed back;

(c) Desired value.

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M❤K