347 + Interview Questions in Design Of Ic Engine Components in Automotive Engine Design Page 5 InterviewSolution

201.	The end movement of the piston pin is restricted by which component?(a) Circlip(b) Welding(c) Bolting(d) RivetingI have been asked this question during an online exam.The above asked question is from IC Engine in section Design of IC Engine Components of Automotive Engine Design
Answer» Right answer is (a) Circlip Easy explanation: The END movement of the piston PIN is RESTRICTED by the means of the circlip, circlip is a thin circular wire that is CONNECTED on both the side of the piston pin.

Discussion

202.	What is the formula to calculate resisting force?(a) Resisting force=(Pmax)ld0l1(b) Resisting force=(Pb)ldil1(c) Resisting force=(Pb)ld0l1(d) Resisting force=(Pb)ld0lsI got this question in final exam.My enquiry is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design
Answer» The correct choice is (c) Resisting force=(PB)ld0l1 To explain: The formula to CALCULATE Resisting force is (Pb)ld0l1where (Pb)l is the bearing pressure at the bush, d0 is the outer diameter and l1 is the LENGTH of the piston PIN.

Discussion

203.	Piston pin is having which cross-section?(a) Hollow rectangular(b) Solid circular(c) Hollow circular(d) Solid rectangularI had been asked this question during an interview.The doubt is from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design
Answer» Correct CHOICE is (c) Hollow circular The BEST I can explain: PISTON pin is made of the hollow circular cross-section to reduce its weight. HOWEVER, the strength of solid circular-section is equal to a hollow circular cross-section.

Discussion

204.	What is the function of the piston pin?(a) To connect the piston to the crankshaft(b) To connect the piston to the piston head(c) To connect cam to the piston(d) To connect the piston to the connecting rodI got this question during an online interview.This intriguing question comes from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design
Answer» Right option is (d) To connect the piston to the CONNECTING ROD Best explanation: The major function of the piston PIN is to connect the piston to the connecting rod. The piston pin is also called a gudgeon pin or wrist pin.

Discussion

205.	Calculate the empirical relationship for the length of the piston when D=80mm?(a) 60 t0 90mm(b) 80 to 120mm(c) 70 to 100mm(d) 90 to 110mmThis question was posed to me during an interview for a job.I'd like to ask this question from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design
Answer» Right OPTION is (B) 80 to 120MM The explanation: L= D to 1.5D = 80 to 1.5×80 = 80 to 120mm

Discussion

206.	Calculate the empirical relationship for the length of the skirt when D=80mm?(a) 20 to 40mm(b) 35 to 70mm(c) 52 to 64mm(d) 43 to 57mmThis question was addressed to me by my college professor while I was bunking the class.My question is taken from IC Engine in division Design of IC Engine Components of Automotive Engine Design
Answer» Right ANSWER is (C) 52 to 64mm Easiest EXPLANATION: ls= (0.65D) to (0.8D) =0.65×80 to 0.8×80 = 52 to 64mm

Discussion

207.	Calculate the stroke length when side thrust is 19634.95N/mm^2, Pb=0.4N/mm^2 and D=250mm?(a) 180.4mm(b) 143.4mm(c) 180.9mm(d) 196.3mmThe question was asked in a job interview.This interesting question is from IC Engine in section Design of IC Engine Components of Automotive Engine Design
Answer» The CORRECT OPTION is (d) 196.3mm The EXPLANATION is: SIDE THRUST= PbDLs 19634=0.4×250×Ls Ls=196.3mm

Discussion

208.	Which of the mentioned below is the formula for calculating side thrust considering coefficient of friction?(a) Side thrust=PbD(b) Side thrust=PbDLs(c) Side thrust=μ\((\frac{\pi D^2}{4})\)Pmax(d) Side thrust=\((\frac{\pi D^2}{4})\)PmaxThe question was posed to me by my college professor while I was bunking the class.Query is from IC Engine in portion Design of IC Engine Components of Automotive Engine Design
Answer» CORRECT OPTION is (c) Side thrust=μ\((\frac{\pi D^2}{4})\)PMAX Easiest explanation: In the formula, we should concentrate on the Co-efficient of FRICTION and it is present in the formula of Side thrust=μ\((\frac{\pi D^2}{4})P\)Pmax.

Discussion

209.	Calculate the side thrust when μ=0.1, D=85mm and Pmax=4N/mm^2?(a) 2269.8N/mm^2(b) 100N/mm^2(c) 3264N/mm^2(d) 4563.4N/mm^2This question was posed to me during an interview.I need to ask this question from IC Engine in division Design of IC Engine Components of Automotive Engine Design
Answer» RIGHT option is (a) 2269.8N/mm^2 The BEST I can explain: SIDE thrust=μ\((\frac{\PI D^2}{4})P_{max}\) =0.1×\((\frac{\pi\times 85^2}{4})\times 4\) = 2269.8N/mm^2

Discussion

210.	In the formula Side thrust=PbDLs what is the unit of ls?(a) Cm(b) Km(c) mm(d) mThe question was posed to me in final exam.Query is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design
Answer» CORRECT option is (c) mm The explanation: In this formula for SIDE thrust Pb is the allowable bearing PRESSURE, D is the DIAMETER whereas ls is the stroke LENGTH and it is always taken in mm.

Discussion

211.	Which of the mentioned below is the formula for calculating side thrust considering stroke length?(a) Side thrust=PbDLs(b) Side thrust=PbD(c) Side thrust=μ\((\frac{\pi D^2}{4})\)Pmax(d) Side thrust=μ\((\frac{\pi D^2}{4})\)This question was addressed to me by my college director while I was bunking the class.This key question is from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design
Answer» The CORRECT CHOICE is (a) Side thrust=PbDLs The BEST explanation: In the formula, we should concentrate on STROKE length ls and the stroke length is present in the formula of Side thrust= PbDLs.

Discussion

212.	In the formula Side thrust=μ\((\frac{\pi D^2}{4})\)Pmax what is the unit of Pmax?(a) N(b) N/mm^2(c) N/m(d) N/mmThis question was posed to me in an interview for internship.My enquiry is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design
Answer» Correct ANSWER is (b) N/mm^2 To elaborate: In this formula of side thrust, µ is the COEFFICIENT of friction, D is the bore diameter and Pmax is the maximum BEARING PRESSURE and unit of pressure is always N/mm^2.

Discussion

213.	Maximum side thrust is experienced during which stroke?(a) Intake stroke(b) Exhaust stroke(c) Expansion stroke(d) Suction strokeThe question was posed to me during an interview for a job.I'm obligated to ask this question of IC Engine in chapter Design of IC Engine Components of Automotive Engine Design
Answer» Correct choice is (C) Expansion stroke The explanation is: Side thrust is due to the sudden load on the PISTON and this is experienced during the DOWNWARD MOMENT of the piston i.e., during the expansion stroke.

Discussion

214.	Calculate the width of the ring groove when h=5mm?(a) 3 to 5.8mm(b) 3.75 to 5mm(c) 4 to 5.9mm(d) 4.7 to 5.2mmThe question was asked in an interview for internship.Query is from IC Engine in division Design of IC Engine Components of Automotive Engine Design
Answer» CORRECT OPTION is (B) 3.75 to 5MM The EXPLANATION is: h2=0.75h to h =0.75×5 to 5 = 3.75 to 5mm

Discussion

215.	Which portion of the piston is known as a skirt?(a) The portion above compression rings(b) The portion between compression and oil rings(c) The portion above the oil rings(d) The portion below oil ringsI got this question in homework.The query is from IC Engine topic in section Design of IC Engine Components of Automotive Engine Design
Answer» CORRECT option is (d) The PORTION below oil RINGS The explanation is: Skirt is the cylindrical portion in the PISTON between the last oil SCRAPER ring and the open end of the piston. Hence, Portion below oil rings is the correct answer.

Discussion

216.	What is the gap between the free ends of the ring after assembly when D=80mm?(a) 0.7 to 0.43mm(b) 0.11 to 0.25mm(c) 0.1 to 1.9mm(d) 0.16 to 0.32mmThis question was addressed to me by my college professor while I was bunking the class.The origin of the question is IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design
Answer» The CORRECT OPTION is (d) 0.16 to 0.32mm Explanation: G=0.002D to 0.004D = 0.002×80 to 0.004×80 = 0.16 to 0.32mm

Discussion

217.	Calculate the distance from the top of the piston to the first ring grove when th=7mm?(a) 8.5 to 10mm(b) 7.5 to 9mm(c) 7 to 8.4mm(d) 8 to 9.4mmI got this question in quiz.I need to ask this question from IC Engine in portion Design of IC Engine Components of Automotive Engine Design
Answer» The CORRECT ANSWER is (C) 7 to 8.4mm Best EXPLANATION: h1=th to 1.2th = 7 to 1.2×7 = 7 to 8.4mm

Discussion

218.	What is the gap between the free ends of the ring before assembly when b=6mm?(a) 21 to 24mm(b) 20 to 23mm(c) 22 to 23mm(d) 21 to 25mmThis question was addressed to me in an online quiz.This intriguing question originated from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design
Answer» CORRECT CHOICE is (a) 21 to 24MM The explanation: G=3.5b to 4B = 3.5×6 to 4×6 = 21 to 24mm

Discussion

219.	Which type of piston rings are preferred in an engine?(a) Oversized rings(b) Undersized rings(c) Thin rings(d) Thick ringsThis question was posed to me in an online interview.Enquiry is from IC Engine in portion Design of IC Engine Components of Automotive Engine Design
Answer» Correct ANSWER is (C) Thin rings For EXPLANATION: Thin rings reduce the frictional LOSSES and WEAR of the surface. Several thin rings have better sealing action than a few thick rings.

Discussion

220.	Calculate the thickness of the piston barrel at the lower end when t3=13mm?(a) 4.5 to 5mm(b) 3.25 to 4.55mm(c) 5.6 to 7mm(d) 2.25 to 4.6mmI have been asked this question during an internship interview.I need to ask this question from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design
Answer» CORRECT OPTION is (b) 3.25 to 4.55mm The best EXPLANATION: t4 = (0.25t3 to 0.35t3) = (0.25×13) to (0.35×13) = 3.25 to 4.55mm

Discussion

221.	Which of the mentioned below is the formula for calculating the thickness of the piston barrel at the top end?(a) t4=(0.03D+b+4.9)(b) t4=0.03D+b+6.9)(c) t3=(0.03D+b+4.9)(d) t3=0.03D+t4+4.9)The question was posed to me by my college director while I was bunking the class.Origin of the question is IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design
Answer» Correct OPTION is (c) t3=(0.03D+B+4.9) To elaborate: The thickness of the PISTON barrel at the top end is given by t3=(0.03D+b+4.9) where D is the piston DIAMETER and b is the radial width of the ring.

Discussion

222.	Calculate the thickness of the piston barrel at the top end, when D=80mm and b=7.5mm?(a) 14.8mm(b) 15.6mm(c) 13.7mm(d) 16.6mmI got this question in homework.The doubt is from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design
Answer» RIGHT OPTION is (a) 14.8mm To explain I would SAY: T3=(0.03D+b+4.9) = (0.03×80+7.5+4.9) = 14.8mm

Discussion

223.	In the formula t3=(0.03D+b+4.9) what is the unit of b?(a) m(b) μm(c) mm(d) mm^2This question was addressed to me by my school principal while I was bunking the class.I want to ask this question from IC Engine in portion Design of IC Engine Components of Automotive Engine Design
Answer» The CORRECT option is (c) mm The BEST EXPLANATION: This is the formula of the thickness of the piston barrel at the top end, where D is the piston diameter and b is the RADIAL width of the RING. Since it is width so the standard is mm.

Discussion

224.	Where can we see the piston barrel in the piston?(a) Above the piston head(b) Below piston ring(c) Below the wrist pin(d) Below the piston headI had been asked this question during an online exam.I need to ask this question from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design
Answer» Right answer is (d) Below the piston HEAD To explain I WOULD say: Piston barrel is the cylindrical portion of the piston below the piston head. It is the inner cavity below the piston head to the OPEN end of the piston.

Discussion

225.	Find the Radial width of the piston ring, when D=250mm, σt=100MPa, and pw=0.03N/mm^2?(a) 5.5mm(b) 7.5mm(c) 4.5mm(d) 6.5mmI had been asked this question in my homework.This question is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design
Answer» The CORRECT choice is (B) 7.5mm For explanation: b=D\(\SQRT{\frac{3P_w}{\sigma_t}}\) = 150\(\sqrt{\frac{3×0.03}{100}}\) = 7.5mm

Discussion

226.	Find the limit on the minimum axial thickness when D=150mm and Z=7?(a) 1.5mm(b) 3.7mm(c) 2.14mm(d) 4.87mmI got this question by my college director while I was bunking the class.I need to ask this question from IC Engine in portion Design of IC Engine Components of Automotive Engine Design
Answer» Correct answer is (C) 2.14mm For EXPLANATION: hmin=\((\frac{D}{10Z})\) = 150/(10×70) = 2.14mm

Discussion

227.	Find the range of axial thickness of the piston ring, when b=7.5mm?(a) 3.5 to 4mm(b) 4.6 to 3mm(c) 5.78 to 8.4mm(d) 5.25 to 7.5mmThe question was asked in an interview.The above asked question is from IC Engine in division Design of IC Engine Components of Automotive Engine Design
Answer» RIGHT ANSWER is (d) 5.25 to 7.5mm Explanation: The axial thickness of the piston ring is given by h=0.7b to B = 0.7×7.5 to 7.5 = 5.25 to 7.5mm

Discussion

228.	In the formula b=D\(\sqrt{\frac{3P_w}{\sigma_t}}\), what is the unit of Pw?(a) N/mm^2(b) N/m(c) KN/mm(d) N/m^2This question was addressed to me in an online quiz.This intriguing question originated from IC Engine in portion Design of IC Engine Components of Automotive Engine Design
Answer» Right OPTION is (a) N/mm^2 To explain I would say: Pw is the allowable radial WALL pressure on the cylinder wall and pressure is DEFINED as a force upon the UNIT area. Hence, N/mm^2 is the unit.

Discussion

229.	The compression rings have which cross-section?(a) Triangular cross-section(b) Circular cross-section(c) Rectangular cross-section(d) Square cross-sectionThis question was posed to me at a job interview.I'd like to ask this question from IC Engine in division Design of IC Engine Components of Automotive Engine Design
Answer» Right choice is (C) RECTANGULAR cross-section For EXPLANATION: The COMPRESSION rings have rectangular cross-section because rectangular cross-section can withstand more pressure when COMPARED to other cross-sections.

Discussion

230.	Usually how many piston rings are present in a petrol engine?(a) 1(b) 3 to 4(c) 7-10(d) 2This question was posed to me by my school teacher while I was bunking the class.Question is taken from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design
Answer» The correct answer is (b) 3 to 4 To EXPLAIN I would SAY: There is no restriction for deciding the number of piston RINGS in the automobile. Usually, PETROL ENGINES have 3-4 piston rings and diesel engines have 5-7 piston rings.

Discussion

231.	What is the function of the oil ring?(a) To allow charge to the crankcase(b) To increase friction(c) To reduce the frictional losses(d) To compress chargeI have been asked this question in my homework.The query is from IC Engine in portion Design of IC Engine Components of Automotive Engine Design
Answer» Right option is (C) To reduce the frictional losses To explain I would SAY: OIL RING is also known as Oil scrapper rings PLACED below compression rings, they provide proper lubrication of the cylinder liner and reduce frictional losses.

Discussion

232.	What is the function of the compression ring?(a) To seal between piston and cams(b) To seal between cylinder and crank(c) To seal between cylinder and piston(d) To seal between crank and camsThis question was posed to me during an internship interview.My question is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design
Answer» Right OPTION is (c) To seal between cylinder and PISTON Easy explanation: The main FUNCTION of the compression ring is to maintain the seal between the cylinder and the piston, also they transfer heat from the piston head to the cylinder wall.

Discussion

233.	Which are the two types of piston rings in the piston?(a) Bearing and compression rings(b) O-ring and oil rings(c) O-ring and bearing(d) Compression rings and oil ringsI have been asked this question by my college professor while I was bunking the class.The above asked question is from IC Engine in chapter Design of IC Engine Components of Automotive Engine Design
Answer» Right OPTION is (d) Compression rings and oil rings Explanation: The compression ring and the oil ring are the two TYPES of piston rings in the piston, WHEREAS bearing is USED to bear the load and O-ring doesn’t come into the picture.

Discussion

234.	Piston rings are usually made of which material?(a) Cast iron(b) Nichrome(c) Tungsten(d) SilverI had been asked this question by my school principal while I was bunking the class.My doubt stems from IC Engine in portion Design of IC Engine Components of Automotive Engine Design
Answer» Correct choice is (a) Cast iron The best I can explain: Piston rings are usually MADE of grey cast iron or in some cases alloy cast iron SINCE it has EXCELLENT wear resistant PROPERTY.

Discussion

235.	The additional space provided on the piston head is also known as______(a) cup(b) cone(c) cube(d) sphereThe question was posed to me in an online interview.This intriguing question comes from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design
Answer» Right OPTION is (a) cup Best explanation: The additional SPACE provided on the piston HEAD is known as a cup. The space for the cup on the piston head is decided based on the volume of COMBUSTION.

Discussion

236.	When the thickness of the piston head is 5mm, the thickness of the ribs is 1.6 to 2.5mm.(a) True(b) FalseI had been asked this question during an online interview.My question is taken from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design
Answer» Right OPTION is (b) False To explain I would say: When the thickness of the PISTON head is less than 6mm, RIBS are not required hence the answer, thickness of ribs 1.6 to 2.5mm is WRONG.

Discussion

237.	Find the radius of the cup, when the bore diameter is 150mm?(a) 100mm(b) 110mm(c) 115mm(d) 105mmI got this question in homework.I would like to ask this question from IC Engine in section Design of IC Engine Components of Automotive Engine Design
Answer» Correct CHOICE is (d) 105MM For explanation: Radius of CUP= 0.7D = 0.7×150 = 105mm

Discussion

238.	Find the range of thickness of the ribs when the thickness of the piston head is 8mm?(a) 2 to 4mm(b) 3.5 to 4.5mm(c) 2.6 to 4mm(d) 3.6 to 4mmThe question was posed to me in a national level competition.Asked question is from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design
Answer» Right option is (c) 2.6 to 4mm Best explanation: THICKNESS of RIBS is given by tr=\(\FRAC{t_h}{3}to\frac{t_h}{2}\) =\(\frac{8}{3}to\frac{8}{3}\) = 2.6 to 4mm

Discussion

239.	The side thrust is transmitted to the cylinder wall through which portion of the piston?(a) piston head(b) skirt portion(c) rings(d) piston pinThe question was posed to me in an interview for internship.I'd like to ask this question from IC Engine in section Design of IC Engine Components of Automotive Engine Design
Answer» Right ANSWER is (b) skirt portion The explanation: The side THRUST is due to the ovality of the piston, due to the gas PRESSURE on the piston head side thrust is created and it is transmitted to the CYLINDER wall through the skirt portion.

Discussion

240.	The side thrust is created by which component of the engine?(a) Camshaft(b) Crankshaft(c) Connecting rod(d) Wrist pinThis question was posed to me during an online exam.This interesting question is from IC Engine in portion Design of IC Engine Components of Automotive Engine Design
Answer» The correct CHOICE is (C) Connecting rod The explanation: The side thrust is created by the obliquity of the connecting rod and it is TRANSMITTED to the PISTON at piston pin. Hence, connecting rod is the right answer.

Discussion

241.	Ribs transmit heat from ______ to piston rings.(a) piston head(b) skirt portion(c) rings(d) piston pinThe question was asked in class test.I'd like to ask this question from IC Engine in division Design of IC Engine Components of Automotive Engine Design
Answer» Correct option is (a) PISTON HEAD Best explanation: Ribs transmit a large PORTION of combustion HEAT from the piston head to the piston rings. This reduces the temperature difference between the center and SIDE of the piston head.

Discussion

242.	Calculate the thickness of the piston head by strength criteria, given D=250mm, Pmax=3MPa, σb= 43N/mm^2.(a) 23.92mm(b) 32.85mm(c) 43.3mm(d) 28.593mmThis question was posed to me at a job interview.Query is from IC Engine in section Design of IC Engine Components of Automotive Engine Design
Answer» RIGHT ANSWER is (d) 28.593mm The best explanation: th=D\(\sqrt{\FRAC{3}{16}\frac{P_{max}}{\sigma_b}}\) =250\(\sqrt{\frac{3}{16}\frac{3}{43}}\) = 28.593mm

Discussion

243.	Why piston ribs are provided in the piston?(a) To strengthen cylinder(b) To strengthen piston head(c) To strengthen cams(d) To strengthen crankshaftI have been asked this question during a job interview.My question is based upon IC Engine in division Design of IC Engine Components of Automotive Engine Design
Answer» Correct CHOICE is (B) To strengthen PISTON head Explanation: Ribs strengthen the piston head against the gas pressure. They increase the rigidity and prevent the distortion of the piston head.

Discussion

244.	Calculate the thickness of the piston head based on head dissipation, given H=5398.82, k=46.8, (Tc-Te)=200?(a) 45.92mm(b) 30.85mm(c) 43.3mm(d) 35.98mmThe question was asked in an online quiz.My query is from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design
Answer» CORRECT option is (a) 45.92mm The EXPLANATION: th=\(\FRAC{H}{12.56K(T_c-T_e)}\) × 10^3 =\(\frac{5398.82}{12.56×46.8(200)}\) × 10^3 = 45.92mm

Discussion

245.	Calculate the amount of heat conducted through piston head, when C=0.05, HCV=47×10^3 KJ/Kg, m=0.25 Kg/Kw/s, BP=8W?(a) 4500KJ(b) 450KJ(c) 470KJ(d) 4700KJThe question was asked by my school teacher while I was bunking the class.The above asked question is from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design
Answer» CORRECT CHOICE is (d) 4700KJ Explanation: H=[C×HCV×m×BP] ×10^3 =[0.05×47×10^3×0.25×8] ×10^3 = 4700KJ

Discussion

246.	Bore diameter is 150mm, calculate the thickness based on Held and favary formula?(a) 6.3mm(b) 5.7mm(c) 6.3mm^2(d) 5.7mm^2I got this question by my school teacher while I was bunking the class.Asked question is from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design
Answer» The CORRECT OPTION is (a) 6.3mm The BEST I can EXPLAIN: th=0.032D+1.5 =0.032(150)+1.5 =6.3mm

Discussion

247.	Which of the mentioned below is used to calculate the thickness of the piston head based on heat dissipation?(a) th=\(\frac{T}{12.56K(T_c-T_e)}\) × 10^3(b) H=\(\frac{H}{12.56K(T_c-T_e)}\) × 10^3(c) th=\(\frac{H}{12.56K(T_c-T_e)}\) × 10^3(d) th=\(\frac{m}{12.56K(T_c-T_e)}\) × 10^3I have been asked this question in an internship interview.Origin of the question is IC Engine in chapter Design of IC Engine Components of Automotive Engine Design
Answer» RIGHT choice is (c) th=\(\FRAC{H}{12.56K(T_c-T_e)}\) × 10^3 Explanation: th is the THICKNESS of the piston HEAD, H is the Heat CONDUCTED, K is thermal conductivity factor, Tc-Te is the temperature from the center to edge of the piston. When all these are summed, we get th=\(\frac{H}{12.56K(T_c-T_e)}\times 10^3\).

Discussion

248.	Which of the mentioned below is the Held and favary for the thickness of the piston head?(a) th=0.032D+1.5(b) th=0.032D+1.5d(c) th=0.032D+1.5h(d) th=0.032V+1.5DThe question was asked in homework.I'm obligated to ask this question of IC Engine in division Design of IC Engine Components of Automotive Engine Design
Answer» The CORRECT answer is (a) th=0.032D+1.5 To explain I would SAY: Held and Favary suggested an empirical formula for finding the THICKNESS of the piston head and it is given by th=0.032D+1.5, where D is bore DIAMETER.

Discussion

249.	Which of the mentioned below is the Grashoff’s formula?(a) th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{T}}\)(b) th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{\sigma_b}}\)(c) th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{BP}}\)(d) th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{IP}}\)This question was addressed to me by my college director while I was bunking the class.This question is from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design
Answer» Right choice is (B) th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{\sigma_b}}\) EXPLANATION: According to Grashoff’s law formula, the thickness of the piston HEAD is given by, th=D\(\sqrt{\frac{3}{16}\frac{P_{max}}{\sigma_b}}\) Where D is the BORE diameter, Pmaxis maximum gas pressure and σb is the stress on the CYLINDER head.

Discussion

250.	Which are the two criteria for calculating the thickness of the piston head?(a) Heat and Strain(b) Strain and stress(c) Fracture and Strength(d) Strength and Heat dissipationThe question was posed to me in examination.This is a very interesting question from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design
Answer» CORRECT answer is (d) Strength and Heat DISSIPATION The best explanation: A LOT of stresses are induced during combustion and it should be able to withstand the heat. Hence, Piston thickness can be CALCULATED based on Strength and Heat dissipation.

Discussion

Explore topic-wise InterviewSolutions in .

The end movement of the piston pin is restricted by which component?(a) Circlip(b) Welding(c) Bolting(d) RivetingI have been asked this question during an online exam.The above asked question is from IC Engine in section Design of IC Engine Components of Automotive Engine Design

Piston pin is having which cross-section?(a) Hollow rectangular(b) Solid circular(c) Hollow circular(d) Solid rectangularI had been asked this question during an interview.The doubt is from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design

Calculate the stroke length when side thrust is 19634.95N/mm^2, Pb=0.4N/mm^2 and D=250mm?(a) 180.4mm(b) 143.4mm(c) 180.9mm(d) 196.3mmThe question was asked in a job interview.This interesting question is from IC Engine in section Design of IC Engine Components of Automotive Engine Design

Calculate the side thrust when μ=0.1, D=85mm and Pmax=4N/mm^2?(a) 2269.8N/mm^2(b) 100N/mm^2(c) 3264N/mm^2(d) 4563.4N/mm^2This question was posed to me during an interview.I need to ask this question from IC Engine in division Design of IC Engine Components of Automotive Engine Design

In the formula Side thrust=PbDLs what is the unit of ls?(a) Cm(b) Km(c) mm(d) mThe question was posed to me in final exam.Query is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

In the formula Side thrust=μ\((\frac{\pi D^2}{4})\)Pmax what is the unit of Pmax?(a) N(b) N/mm^2(c) N/m(d) N/mmThis question was posed to me in an interview for internship.My enquiry is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

Calculate the width of the ring groove when h=5mm?(a) 3 to 5.8mm(b) 3.75 to 5mm(c) 4 to 5.9mm(d) 4.7 to 5.2mmThe question was asked in an interview for internship.Query is from IC Engine in division Design of IC Engine Components of Automotive Engine Design

Calculate the distance from the top of the piston to the first ring grove when th=7mm?(a) 8.5 to 10mm(b) 7.5 to 9mm(c) 7 to 8.4mm(d) 8 to 9.4mmI got this question in quiz.I need to ask this question from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Which type of piston rings are preferred in an engine?(a) Oversized rings(b) Undersized rings(c) Thin rings(d) Thick ringsThis question was posed to me in an online interview.Enquiry is from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Calculate the thickness of the piston barrel at the top end, when D=80mm and b=7.5mm?(a) 14.8mm(b) 15.6mm(c) 13.7mm(d) 16.6mmI got this question in homework.The doubt is from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design

In the formula t3=(0.03D+b+4.9) what is the unit of b?(a) m(b) μm(c) mm(d) mm^2This question was addressed to me by my school principal while I was bunking the class.I want to ask this question from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Find the Radial width of the piston ring, when D=250mm, σt=100MPa, and pw=0.03N/mm^2?(a) 5.5mm(b) 7.5mm(c) 4.5mm(d) 6.5mmI had been asked this question in my homework.This question is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

Find the limit on the minimum axial thickness when D=150mm and Z=7?(a) 1.5mm(b) 3.7mm(c) 2.14mm(d) 4.87mmI got this question by my college director while I was bunking the class.I need to ask this question from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Find the range of axial thickness of the piston ring, when b=7.5mm?(a) 3.5 to 4mm(b) 4.6 to 3mm(c) 5.78 to 8.4mm(d) 5.25 to 7.5mmThe question was asked in an interview.The above asked question is from IC Engine in division Design of IC Engine Components of Automotive Engine Design

In the formula b=D\(\sqrt{\frac{3P_w}{\sigma_t}}\), what is the unit of Pw?(a) N/mm^2(b) N/m(c) KN/mm(d) N/m^2This question was addressed to me in an online quiz.This intriguing question originated from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Usually how many piston rings are present in a petrol engine?(a) 1(b) 3 to 4(c) 7-10(d) 2This question was posed to me by my school teacher while I was bunking the class.Question is taken from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design

What is the function of the oil ring?(a) To allow charge to the crankcase(b) To increase friction(c) To reduce the frictional losses(d) To compress chargeI have been asked this question in my homework.The query is from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Piston rings are usually made of which material?(a) Cast iron(b) Nichrome(c) Tungsten(d) SilverI had been asked this question by my school principal while I was bunking the class.My doubt stems from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

The additional space provided on the piston head is also known as______(a) cup(b) cone(c) cube(d) sphereThe question was posed to me in an online interview.This intriguing question comes from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

When the thickness of the piston head is 5mm, the thickness of the ribs is 1.6 to 2.5mm.(a) True(b) FalseI had been asked this question during an online interview.My question is taken from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design

Find the radius of the cup, when the bore diameter is 150mm?(a) 100mm(b) 110mm(c) 115mm(d) 105mmI got this question in homework.I would like to ask this question from IC Engine in section Design of IC Engine Components of Automotive Engine Design

The side thrust is created by which component of the engine?(a) Camshaft(b) Crankshaft(c) Connecting rod(d) Wrist pinThis question was posed to me during an online exam.This interesting question is from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Ribs transmit heat from ______ to piston rings.(a) piston head(b) skirt portion(c) rings(d) piston pinThe question was asked in class test.I'd like to ask this question from IC Engine in division Design of IC Engine Components of Automotive Engine Design

Calculate the thickness of the piston head by strength criteria, given D=250mm, Pmax=3MPa, σb= 43N/mm^2.(a) 23.92mm(b) 32.85mm(c) 43.3mm(d) 28.593mmThis question was posed to me at a job interview.Query is from IC Engine in section Design of IC Engine Components of Automotive Engine Design

Calculate the thickness of the piston head based on head dissipation, given H=5398.82, k=46.8, (Tc-Te)=200?(a) 45.92mm(b) 30.85mm(c) 43.3mm(d) 35.98mmThe question was asked in an online quiz.My query is from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design