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51.	Theoretically, the inlet valve should open at what position of the piston?(a) Bottom dead centre(b) Side centre position(c) Bottom side position(d) Top dead centreThe question was posed to me in an interview for internship.My question is based upon Valve Timing topic in section Valve Timing Technologies of Automotive Engine Design
Answer» Correct OPTION is (d) Top DEAD centre To elaborate: Theoretically the INLET valve should open at Top dead position of the piston and the inlet valve should close at BOTTOM dead centre position of the piston.

52.	Which of the following when decreased reduces the bearing clearance?(a) Number of shims(b) Number of valves(c) Displacement of the piston(d) Number of spark plugsThis question was posed to me in class test.Asked question is from Valve Timing Technologies topic in section Valve Timing Technologies of Automotive Engine Design
Answer» The CORRECT answer is (a) Number of SHIMS For explanation I would say: SEVERAL shims are present on each side of the bearing, within it and the cap are also provided in the cast type for adjustment of CLEARANCE. Taking out several shims LEADS to a reduction in the bearing clearance.

53.	What is the value of silicon and copper in an extra heavy-duty type sealed power bearing?(a) 11% silicon and 1% copper(b) 1% silicon and 11% copper(c) 5% silicon and 10% copper(d) 10% silicon and 5% copperThe question was asked in an interview for internship.I want to ask this question from Valve Timing Technologies topic in portion Valve Timing Technologies of Automotive Engine Design
Answer» The CORRECT CHOICE is (a) 11% silicon and 1% copper To explain: The EXTRA heavy-duty sealed power bearing is made up of tin flash plate, Babbit over plate, aluminum alloy lobbying, and steel back. This contains 11% silicon, 1% copper, and the remainder aluminum. These alloys do not suffer corrosion as it is copper-based alloy.

54.	What is the value of antimony present in a Babbit metal?(a) 5.5(b) 7.5(c) 6.5(d) 8.5This question was addressed to me in unit test.The origin of the question is Valve Timing Technologies in portion Valve Timing Technologies of Automotive Engine Design
Answer» The correct answer is (b) 7.5 To EXPLAIN I WOULD say: The BABBIT metal are either antimony-tin or antimony-lead alloys. They have a very good conformability, EMBEDDABILITY, and corrosion resistance but a low fatigue strength. It has 7.5% of antimony, 0.2% lead, 0.1% arsenic, 3.0% copper and tin remainder.

55.	Which of the following more when compared to others in a medium-duty sealed powder bearings?(a) Conformability(b) Embeddability(c) Corrosion(d) Fatigue strengthThe question was asked during a job interview.My question is based upon Valve Timing Technologies in portion Valve Timing Technologies of Automotive Engine Design
Answer» Right choice is (d) Fatigue strength To explain I would say: In a medium-duty SEALED powder BEARING copper alloy lining with STEEL back. Copper-based alloys are harder and have higher fatigue strength but less conformability, embeddability, and CORROSION RESISTANCE.

56.	Which of the following material is usually used in the backing to provide support against the shaft load?(a) Lead(b) Copper(c) Tim(d) SteelI had been asked this question by my school principal while I was bunking the class.This intriguing question comes from Valve Timing Technologies topic in chapter Valve Timing Technologies of Automotive Engine Design
Answer» Right choice is (d) Steel Easy explanation: A modern engine BEARING consists of bearing PROPER and a backing. The.backing is usually of steel which provides support against the shaft load ACTING on the shaft. There are three types of bearing MATERIAL they are Babbit,copper-lead, and aluminum.

57.	Which one of the following is not an engine bearing requirement?(a) Corrosion resistance(b) Long life(c) Should multiple the variation of the shafts(d) Should have scoreresistanceI had been asked this question in semester exam.My question comes from Valve Timing Technologies topic in portion Valve Timing Technologies of Automotive Engine Design
Answer» The correct option is (c) Should multiple the VARIATION of the shafts For explanation I would say: The engine bearing REQUIREMENTS are: they should have a long life, the bearing should have score resistance that prevents the bearing material from SEIZING to the shaft, corrosion resistance. Whereas the bearing has to have the ability to FLOW SLIGHTLY to match the small variations in the shaft and not to multiply the variations.

58.	Which are the types of material used in Babbit type bearing material?(a) Lead with a small quantity of copper and antimony(b) Steal with a small quantity of zinc and tin(c) Zinc with a small quantity of lead and copper(d) Silver with a small quantity of brass and aluminumThis question was posed to me by my school principal while I was bunking the class.This question is from Valve Timing Technologies in section Valve Timing Technologies of Automotive Engine Design
Answer» The CORRECT option is (a) LEAD with a small quantity of COPPER and antimony To elaborate: Babbit is made by either lead or tin-based and contains a small quantity of copper and antimony. It is the oldest bearing material for automobile engines and is still used in application where soft material SHAFT under the moderate LOADS and speeds is employed.

59.	Which of the following helps the engine bearing by supporting the operating loads with minimum friction?(a) Good fuel-air ratio for combustion(b) Vibration dampers(c) Clutch(d) LubricantI got this question by my college director while I was bunking the class.This key question is from Valve Timing Technologies topic in chapter Valve Timing Technologies of Automotive Engine Design
Answer» The correct ANSWER is (d) LUBRICANT For explanation: The engine bearing has main requirements LIKE the engine bearing should support the operating loads with minimum FRICTION using lubricant. Whereas the fuel-air ratio, vibration-dampers, and clutch do not affect the engine bearings.

60.	Which is the bearing material which is being used in the modern engine?(a) Brass(b) Cast iron(c) Aluminum(d) ChromiumThe question was asked in class test.This question is from Valve Timing Technologies topic in portion Valve Timing Technologies of Automotive Engine Design
Answer» Right answer is (c) Aluminum To elaborate: The BEARING MATERIAL used in modern engines is aluminum with small quantities of tin and copper, aluminum bearings are used for high load and speed conditions. HOWEVER, it is more EXPENSIVE due to which they are sometimes used with cheaper materials.

61.	How is one of the bearings made to prevent the crankshaft from moving to and fro in the endwise direction?(a) Magnetic bearing(b) Fluid bearing(c) Ball-bearing(d) Thrust bearingThe question was posed to me by my school principal while I was bunking the class.The above asked question is from Valve Timing Technologies topic in division Valve Timing Technologies of Automotive Engine Design
Answer» Correct option is (d) Thrust bearing Best explanation: To prevent the crankshaft from moving to and fro in the endwise direction, one of the bearings is made a thrust bearing. It is PROVIDED with FLANGES on both sides, which FIT accurately with the sides of the CRANK web on which it is installed.

62.	Which of the following is provided to cushion the journal and to increase the life of the bearing?(a) Direction control valve(b) Overlay(c) Position control valve(d) CompressorThis question was posed to me during an interview.My doubt stems from Valve Timing Technologies topic in division Valve Timing Technologies of Automotive Engine Design
Answer» The correct option is (b) Overlay To explain I would say: A overlay or THIRD layer of Babbit is used on top of the copper-lead and aluminum bearings. Due to the overlay, which is 0.01-0.02 mm thick, such bearings are expensive. However the overlay CUSHIONS the journal during the running-in period and THUS increases the LIFE of bearing as WELL as journal.

63.	What is the thickness in mm of the overlay which is provided on the bearings?(a) 0.01-0.02(b) 0.03-0.04(c) 0.05-0.06(d) 0.07-0.08This question was addressed to me in final exam.This is a very interesting question from Valve Timing Technologies topic in section Valve Timing Technologies of Automotive Engine Design
Answer» The correct OPTION is (a) 0.01-0.02 Best explanation: The thickness of the overlay or the third layer of Babbit is USED on top of the copper-lead and ALUMINUM bearings. Due to overlay, which is 0.01-0.02 mm thick, such bearings are EXPENSIVE.