Rita Charitable Trust

Car Driving Test 16

Checking Cylinder bore wear for ovality and taper Class Test

Welcome to your Checking Cylinder bore wear for ovality and taper Class Test Hope you understand the class & now it's time to examine yourself through test. Remember you have only 10 minutes to complete the class test ,after 10 minutes Class test will be automatically submit.ओवेलिटी और टेपर के लिए सिलेंडर बोर वियर की जाँच करने वाले क्लास टेस्ट में आपका स्वागत है। आशा है कि आप क्लास को समझ गए होंगे और अब टेस्ट के माध्यम से खुद को परखने का समय आ गया है। याद रखें कि आपके पास क्लास टेस्ट पूरा करने के लिए केवल 10 मिनट हैं, 10 मिनट के बाद क्लास टेस्ट अपने आप सबमिट हो जाएगा।

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1. What is the primary tool used to measure cylinder bore wear?

Vernier caliper

. Dial gauge

Micrometer

Bore gauge

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2. Cylinder bore wear generally occurs more in:

Center of the bore

Top of the bore

Bottom of the bore

Uniformly across the bore

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3. Ovality in a cylinder bore is the:

Difference between top and bottom diameter

Out-of-roundness of the bore

Taper from one side to another

Diameter difference between left and right sides

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4. Taper in a cylinder bore is measured by checking the difference between:

Side and side

Top and bottom

Center and bottom

Left and right

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5. What is the typical shape of a worn cylinder bore?

Circular

Oval

Hexagonal

Tapered

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6. Excessive taper in a cylinder bore can cause:

Better fuel economy

Increased horsepower

Poor compression and blow-by

Improved lubrication

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7. What instrument can be used in conjunction with a bore gauge to get accurate measurements?

Micrometer

Vernier height gauge

Feeler gauge

Caliper

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8. Cylinder bore ovality is measured by:

Measuring the depth of the bore

Comparing bore diameter at different clock positions

Measuring the crankshaft runout

Measuring ring end gap

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9. The normal position to check for ovality is at:

12 and 6 o’clock

9 and 3 o’clock

Any angle

1 and 7 o’clock

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10. Excessive bore wear leads to:

Reduced cylinder pressure

Improved torque

Less oil consumption

Lower emissions

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11. The wear pattern on a cylinder bore can indicate:

Correct piston ring size

Piston alignment issues

Crankshaft angle

Fuel mixture

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12. When a cylinder is worn more in the middle, it is called:

Taper wear

Oval wear

Barrel wear

Conical wear

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13. The service limit for cylinder ovality is typically:

0.01 mm

0.02 mm

0.05 mm

Varies by manufacturer

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14. What is used to mark the bore measurement levels?

Scribe

Chalk

Punch

Marking pen

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15. Cylinder taper wear affects:

Fuel pressure

Valve timing

Piston ring sealing

Camshaft operation

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16. Bore taper is calculated by:

Subtracting bottom bore reading from top

Subtracting side bore from vertical

Multiplying the average bore by π

Comparing piston size

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17. When checking bore wear, measurements are typically taken at:

One point

Three vertical levels

Middle only

Crankcase level

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18. Which of the following is NOT a cause of cylinder bore wear?

Poor lubrication

Dust entry

Detonation

Balanced combustion

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19. Blow-by is a symptom of:

Perfect sealing

Ovality and taper

Low compression ratio

Overcooling

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20. Measuring bore in a cold engine may lead to:

More accurate results

Shrinkage error

Overestimation

Heat distortion

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21. What is the remedy if ovality exceeds the limit?

Replace piston rings

Rehone the bore

Rebore and install oversized piston

Change oil grade

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22. Maximum wear usually occurs at:

Bottom dead center

Middle of stroke

Top dead center

Oil scraper ring area

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23. The measurement unit for bore wear is:

Inches

microns

mm or microns

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24. Wear pattern indicating scuffing is likely due to:

Cold start

Incorrect fuel

Lack of oil film

Valve wear

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25. Cylinder ovality over time is mostly due to:

Thermal expansion

Side thrust from piston

Wrong ignition timing

Cam wear

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26. Cylinder taper causes:

Proper sealing

Increased ring gap

Higher compression

Shorter stroke

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27. Cylinder bore gauge typically has:

One contact point

Two contact points

Three contact points

Four contact points

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28. Which wear pattern suggests misalignment?

Uniform wear

Top-heavy wear

Diagonal wear

Center wear

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29. Reboring is done to:

Reduce bore size

Remove ovality/taper

Fix crankshaft

Adjust timing

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30. What is typically done after reboring a cylinder?

Replace crankshaft