A. To elongate the assemble time B. to replace parts easily C to identify easily D All 6. Piston ring end gap is measured by: A. Fleer gauge B. dial gauge C. plastic gauge D. Telescopic gauge 7. When checking the thermostat the opening temperature is measured by: A. Thermometer B Micrometer C wind vane D. None 8. The notch /groove/ in the piston is faced /directed/ to the? A. Rear of the engine B. front of the engine C. Up Side of the engine D. down side of the engine 9. When installing the cylinder head cylinder head bolt is tightened with the sequence of: A. From out ward to inward B. From inward to out ward C. from upward to down ward D. None 10. If engine oil is not replaced in the service limit /period of the manufacturer: A. Reduce oil consumption B Abnormal operation C. prolong the engine life D. reduce exhaust gas 11. When assembling the engine if the piston ring is installed upside down A. Increase oil consumption B. compression tight seal intend C. wear/scratch/the cylinder D. All 12. During conducting compression test after unscrew the spark plug why we crank the engine before measuring amount of compression result? A. To warm up the engine B.To present oil film between the cylinder and piston to seal compression C.To accelerate the engine D.To remove soot residual 13. The sum of piston diameter and installed I clearance in the cylinder is called? D. piston groove A. Piston oval B. Cylinder volume C. Bore diameter 14. The main purpose of checking /bringing/injection pump in the injection pump tester is: A. To test delivery timing B.test delivery volume C.To test both delivery timing and volume D.Atomization 15. Opening pressure of injection nozzle is tested: A. By altering the coil spring of the tester B. By tightening the screw to maximum specification of the manual C. By replacing the screw with the shim D. By replacing the shim 16. When inspecting cooling system if water leaks through inspection hole of water pump, what would you do? A.Replace water pump bearing B.Replace water pump seal kit C Bent water pump shaft D.Replace water pump B/ to clean valves 17. Lapping is used to:A/Prevent compression leakage C/ to prevent oil flow to combustion chamber D/ All D/none 18. With an interference angle the valve would be faced at an angle that is : A/10 greater than seat angle B/ 1^0 less than seat angle C/ the same as seat angle D/run to loose 19. If the valve is ground down so much that the margin is low the valve will: A/ run to hot B/Run to cool C/ Run to high 20. __ is the gradual wearing of valve seat B/ valve seat recession A/valve faces D/ none C/interference angle

6. The correct answer is D. Telescopic gauge. The piston ring end gap is measured using a telescopic gauge, which is a type of measuring tool that consists of two telescoping rods with a sliding scale.<br /><br />7. The correct answer is A. Thermometer. When checking the thermostat, the opening temperature is measured using a thermometer. The thermostat is a temperature-sensitive device that controls the flow of coolant in an engine.<br /><br />8. The correct answer is B. Front of the engine. The notch or groove in the piston is faced or directed towards the front of the engine. This is to ensure proper alignment and function of the piston within the cylinder.<br /><br />9. The correct answer is B. From inward to outward. When installing the cylinder head, the cylinder head bolts are tightened in a specific sequence, starting from the innermost bolts and moving outward. This helps to ensure even torque distribution and proper sealing.<br /><br />10. The correct answer is B. Abnormal operation. If engine oil is not replaced within the service limit or period specified by the manufacturer, it can lead to abnormal operation of the engine. This can result in increased wear and tear, reduced efficiency, and potential damage to engine components.<br /><br />11. The correct answer is D. All. If the piston ring is installed upside down during engine assembly, it can lead to increased oil consumption, reduced compression tight seal, and wear or scratching of the cylinder. All of these issues can negatively impact engine performance and longevity.<br /><br />12. The correct answer is B. To prevent oil film between the cylinder and piston to seal compression. During a compression test, the engine is cranked before measuring the amount of compression to prevent an oil film from forming between the cylinder and piston. This ensures accurate measurement of compression pressure.<br /><br />13. The correct answer is C. Bore diameter. The sum of the piston diameter and the installed clearance in the cylinder is called the bore diameter. The bore diameter is an important measurement in engine design and helps determine the cylinder size and piston clearance.<br /><br />14. The correct answer is C. To test both delivery timing and volume. The main purpose of checking or bringing an injection pump to the injection pump tester is to test both the delivery timing and volume of the pump. This ensures proper fuel delivery and engine performance.<br /><br />15. The correct answer is A. By altering the coil spring of the tester. The opening pressure of the injection nozzle is tested by altering the coil spring of the tester. This allows for precise adjustment of the nozzle opening pressure for optimal fuel delivery.<br /><br />16. The correct answer is B. Replace water pump seal kit. If water leaks through the inspection hole of the water pump during an inspection of the cooling system, the recommended action is to replace the water pump seal kit. This will help prevent further leakage and ensure proper functioning of the water pump.<br /><br />17. The correct answer is A. Prevent compression leakage. Lapping is a process used to smooth the surfaces of the valve and valve seat, which helps prevent compression leakage. By removing any roughness or irregularities, lapping ensures a proper seal and optimal engine performance.<br /><br />18. The correct answer is B. 1 degree less than seat angle. With an interference angle, the valve would be faced at an angle that is 1 degree less than the seat angle. This allows for proper valve seating and prevents valve float during engine operation.<br /><br />19. The correct answer is C. Run to high. If the valve is ground down so much that the margin is low, the valve will run to high. This means that the valve will open earlier than intended, leading to potential issues with engine performance and efficiency.<br /><br />20. The correct answer is B. Valve seat recession. Valve seat recession refers to the gradual wearing of the valve seat, which can lead to issues with valve seating and engine performance. Regular maintenance and inspection of the valve seat can help prevent excessive wear and ensure proper engine operation.