Problems Related To Engine Bearing - Multiple Choice Questions and Answer

Problems Related To Engine Bearing - Multiple Choice Questions and Answer Points : problems related to engine bearing, problems in internal combustion engines, ic, engine, auto diesel, mcqs, evaluation, objective type question and answer, multiple choice questions and answer 1. State as many factors you know on which the satisfactory performance of bearings depend.
• The performance of bearings depends upon the following factors:
• Proper installation of bearings and their counter part.
• Good lubrication with proper oil
• Keep the oil clean
• Operating the engine at speeds and loading well within its capacity.
• Protecting the engine against dust and dirt.

2. What is the result of increased bearing oil clearance on piston operation?
Too much clearance will allow the excessive oil throw-off occurs. The excess of enters past the piston into the combustion area, when it is burned. The burned oil burns into heavy carbon; and varnish, which is deposited n the pistons, walls and valves. There deposit choke the ring grooves, clog the oil return holes. plug up the oil ring slots, foul spark plugs, prevent valves from seating properly and form and insulating surface which prevents proper heat dissipation.

3. Why is it said that the load, speed and temperature conditions under which bearings work will not decrease in severity?
Because of tremendous amount of work has been done on the bearing problems.

4. What are the two causes for bearing having too much clearance?
If the bearings are fitted with very little oil clearance, then such parts as cylinder walls, pistons, valves, valve guides, tappets and piston pins will starve for lack of lubrication. If bearing is fitted with too much clearance, then excessive oil throw-off occurs which sometimes even the best new rings cannot control. The excess oil enters the cylinder bores and works up into the combustion area, where it is burned.

5. What is meant by oil clearance?
Space between bearing and shaft for the lubricant oil film to form.

6. What are the functions of lubricants?
To cool and lubricate the bearing walls.

7. What are the three basic types of engine bearings?
• Connecting rod bearings
• Crankshaft main bearing
• Camshaft bearings

8. Which of the following metals is the main locking backing material (body of bearing that contacts stationary part)?
a) Babbit (load-tin-alloy)
b) Copper
c) Steel
d) Aluminum

9. Bearing crush is used to help prevent bearing from spinning inside the bore during engine operation.
a) True
b) False

10. Bearing conformability is the bearing’s ability to withstand the downward force of piston.
a) True
b) False