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51.	What is the percentage of heat transfer rate in a hybrid liner?(a) 50%(b) 90%(c) 30%(d) 70%The question was asked in quiz.I would like to ask this question from Engine Components in chapter Basic Engine Components of Automotive Engine Design
Answer» Correct answer is (c) 30% EXPLANATION: The use of hybrid liners results in UPTO 30% higher heat transfer rates, which can REDUCE cylinder wall temperature by upto 40 DEGREES centigrade. The distortion of loads is claimed to be upto three times better, which results in upto 40% reduction in OIL consumption.

52.	Which of the following technique is used to limit the crank formation in a hybrid liner?(a) Presence of a water channel(b) Presence of excess material(c) Presence of pressure relief valve(d) Presence of vent holesThe question was asked in an internship interview.This key question is from Engine Components topic in section Basic Engine Components of Automotive Engine Design
Answer» The CORRECT OPTION is (a) Presence of a water channel Explanation: In a hybrid liner a water channel is drilled between two cylinders which limits the CRACK FORMATION, allowing coolant to penetrate only UPTO the liner coating. In conventional liners, coolant may seep down the joint between the liner and the casting.

53.	What is the percentage of maximum second-order bore distortion in a conventional cast-in liners?(a) 11(b) 7(c) 5(d) 3I got this question in unit test.I want to ask this question from Engine Components topic in portion Basic Engine Components of Automotive Engine Design
Answer» Right choice is (a) 11 The best EXPLANATION: The maximum second-order BORE distortion in conventional cast-in liners is seen about 11% when compared to a HYBRID liner the bore distortion is reduced in a running engine by two-thirds.

54.	What is the maximum pressure value in the bar of a hybrid liner?(a) 50(b) 150(c) 200(d) 100I have been asked this question by my college director while I was bunking the class.I want to ask this question from Engine Components topic in division Basic Engine Components of Automotive Engine Design
Answer» Right choice is (C) 200 Easy explanation: The hybrid liner has INCREASED DYNAMIC strength. Federal-Mogul’s cyclic pulsing pressure test showed the hybrid liner can survive at pressure up to 200bar, whereas STANDARD liner BLOCK design cracked at 100 bar.

55.	Which of the following is coated outside along with a conventional cast-iron sleeve in a hybrid liner?(a) Austenitic steel 21-4N(b) Nimonic alloy(c) S.A.E 1045(d) AlSI 12 alloyI had been asked this question in a job interview.This intriguing question originated from Engine Components topic in section Basic Engine Components of Automotive Engine Design
Answer» Correct option is (d) AlSI 12 alloy Explanation: The HYBRID liner PRODUCED at Federal-Mogul’s Fried Berg (Germany) factory, consists of a CONVENTIONAL cast-iron sleeve coated on the OUTSIDE with on AlSi 12 alloy with a melting point below that of the aluminum engine BLOCK, using a proprietary Federal-Mogul process.

56.	Which among the following material is most commonly used in the manufacturing of cylinder liner?(a) Titanium(b) Copper(c) Brass(d) Grey cast ironThis question was posed to me in my homework.Asked question is from Engine Components in portion Basic Engine Components of Automotive Engine Design
Answer» Right answer is (d) Grey cast iron Explanation: The cylinder liners are made up of grey cast iron. In some CASES, grey cast iron alloyed with CHROMIUM, vanadium, and molybdenum is USED. The liners are manufactured either by CENTRIFUGAL CASTING process or by gravity die casting process in metal or sand mold.

57.	Which of the following is not the reason for the breaking of the flange in a wet liner?(a) Worn out counterbore seat(b) Excessive tightening of head bolts(c) Uneven counterbore(d) Damaged piston pin bossI got this question in an online quiz.My question is from Engine Components topic in section Basic Engine Components of Automotive Engine Design
Answer» Right answer is (d) Damaged PISTON pin boss The best explanation: The breaking of a flange in a wet liner is DUE to the wrong tightening sequence of cylinder HEAD bolts or their excessive tightening, uneven COUNTERBORE in the block to RECEIVE the liner, worn-out counterbore seats and not damaged piston pin boss.

58.	Which among the following material is plated on the cylinder liner to improve the resistance to corrosion and wear?(a) Cast iron(b) Chromium(c) Zinc(d) LeadThe question was asked by my college professor while I was bunking the class.I want to ask this question from Engine Components topic in chapter Basic Engine Components of Automotive Engine Design
Answer» The correct answer is (b) CHROMIUM For explanation I would say: The liners are exposed to ammonia vapor at about 500 degrees centigrade and then quenched. Chromium plating improves the resistance to wear and corrosion. The USE of chromium with aluminum ALLOY results in INCREASED thermal EFFICIENCY.

59.	Which type of fit is used with the block in a wet liner?(a) Slip fit(b) Press-fit(c) Friction fit(d) Hydraulic dilationI have been asked this question in unit test.I'm obligated to ask this question of Engine Components topic in portion Basic Engine Components of Automotive Engine Design
Answer» RIGHT choice is (a) Slip fit To explain: In a wet liner the block and the liner are fitted together with the help of slip fit. It is the condition where the liner is meant to easily slip into the mating PART with MINIMAL friction. Whereas in the dry liner PRESS fit is used to fit the liner and the cylinder block.

60.	Which type of casting process is used to cast cylinder liners?(a) Centrifugal casting(b) Investment casting(c) Die casting(d) Sand castingThis question was addressed to me in an interview for job.Question is from Engine Components topic in portion Basic Engine Components of Automotive Engine Design
Answer» The CORRECT answer is (a) Centrifugal casting To elaborate: Liners are used to restore to its original size a cylinder block which has been rebored beyond ALLOWABLE limits. They are made in the form of barrels from a special alloy containing silicon, MANGANESE,nickel, and CHROMIUM. Liners are cast centrifugally.