cameroon gce A level 2026 engine systems 1

Internal Combustion Engine Mechanicals & Lubrication Quiz

Test your understanding of engine mechanical design, calculations, and lubrication systems with these 13 multiple-choice questions.

📷 Note: You can reference the original figures, engine component drawings, and cooling schematics in image_5d567d.jpg.

Question 1

One of the reasons for adding counterbalance weight to a crankshaft is to:

• A. counteract bending deflection and reduces bearing pressure.

• B. reduce axial load and vibration.

• C. reduce torsional vibration at high speed.

• D. reduce axial load and deflection.

Question 2

The following are functions of the piston rings EXCEPT:

• A. Act as a seal against combustion leakage.

• B. Transmit heat from piston to cylinder wall.

• C. Control lubricating oil on the walls.

• D. Transmit piston force to cylinder walls.

Question 3

What is this technician doing in Figure 1?

(Refer to Figure 1 in image_5d567d.jpg — showing a hand using a feeler gauge under a rocker arm assembly)

• A. Removing the pushrod.

• B. Determine zero lash.

• C. Adjusting the pushrod length.

• D. Adjusting the ratio of the rocker arm.

Question 4

The crankshaft is subjected to three modes of vibration during engine operation. They are:

• A. Axial, torsional and bending

• B. Torsional radial and bending

• C. Torsional shearing and bending

• D. Torsional, tensile and bending

Question 5

Prevention of valve bouncing opening at the wrong time in the engine cycle is done by:

• A. Valve seat inserts

• B. Valve guides

• C. Valve springs

• D. Valve stems

Question 6

A cracked cylinder head may be indicated by:

• A. Low compression ratio

• B. Gas blow-by

• C. Combustion gases vented into expansion tank

• D. Low injection pressure

Question 7

A square type engine has:

• A. a geometrical shape as square

• B. a cylinder bore equal to stroke length

• C. two cylinders horizontal and two cylinders vertical

• D. four cylinders with phase shift of 90° between any consecutive two cylinders

Question 8

A 4-stroke 4-cylinder reciprocating engine has cylinder diameter of 4 cm, stroke length of 7 cm and clearance volume 2 cm³. The engine capacity in cc is:

• A. 110

• B. 252

• C. 352

• D. 400

Question 9

A relief valve fitted to the main oil gallery of an engine is to:

• A. limit the maximum oil pressure.

• B. open when the oil is hot.

• C. maintain the supply if the gallery becomes blocked.

• D. stop the oil flow to the bearings.

Question 10

Oil viscosity may be tested with a/an:

• A. oil meter.

• B. viscometer.

• C. dip stick.

• D. oil gauge.

Question 11

A steam engine comes under the category of:

• A. external combustion engines

• B. internal combustion engines

• C. both a and b

• D. none of the above.

Question 12

The function of a crankcase in a two stroke petrol engine is to:

• A. lower down the temperature

• B. forms a pressurized chamber for air fuel mixture.

• C. hold the exhaust gases after combustion.

• D. hold the lubricant.

Question 13

Figure 2 represents:

(Refer to Figure 2 in image_5d567d.jpg — showing a heat exchanger layout with Coolant In/Out lines cross-cooling Heated Engine Oil In/Out paths)

• A. an oil radiator.

• B. a mixed radiator.

• C. an oil cooler.

• D. a secondary radiator.

  (Note: Options C and D are generalized solutions for the structural layout shown in Figure 2).