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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

301.

Calculate the water space between the outer cylinder wall and the inner jacket, bore is 160mm?(a) 18.4mm(b) 19.3mm(c) 20.2mm(d) 21.1mmThe question was posed to me in an online quiz.My question is taken from IC Engine topic in section Design of IC Engine Components of Automotive Engine Design

Answer»

Right choice is (B) 19.3mm

Explanation: Water space between the outer CYLINDER WALL and the inner JACKET is

=0.08D+6.5

=19.3mm

302.

What is the range of water jacket when the thickness is 8mm?(a) 2.6 to 6mm(b) 3.5 to 4mm(c) 4 to 5mm(d) 2.8 to 7mmI have been asked this question in class test.My question is taken from IC Engine in division Design of IC Engine Components of Automotive Engine Design

Answer»

The CORRECT CHOICE is (a) 2.6 to 6mm

Explanation: THICKNESS of water jacket ranges from when the thickness is GIVEN is

=\(\frac{1}{3}t\) to \(\frac{3}{4}\)t

= 2.6 to 6mm

303.

Calculate the range of thickness of the water jacket when D=160mm?(a) 4.1 to 5.1mm(b) 6.3 to 8mm(c) 5.12 to 1.6mm(d) 3.4 to 6mmI have been asked this question in examination.The question is from IC Engine topic in section Design of IC Engine Components of Automotive Engine Design

Answer»

Right option is (c) 5.12 to 1.6mm

To explain I WOULD say: Thickness of water jacket RANGES from when bore diameter is GIVEN is

= 0.032D to 1.6

= 5.12 to 1.6mm

304.

What is the range of thickness of the dry liner, when the bore diameter is 150mm?(a) 3.5 to 4.5mm(b) 4.5 to 5.25mm(c) 5.5 to 6mm(d) 6 to 7.2mmI have been asked this question by my school principal while I was bunking the class.I would like to ask this question from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

Answer» RIGHT OPTION is (b) 4.5 to 5.25mm

For explanation I WOULD say: THICKNESS of dry liner ranges from 0.03D to 0.035D

=0.03×150 to 0.035×150

=4.5 to 5.25mm
305.

What is the thickness of the cylinder wall when the bore diameter is 150mm?(a) 8.35mm(b) 7.1mm(c) 8.8mm(d) 7.6mmI had been asked this question in my homework.Question is taken from IC Engine topic in section Design of IC Engine Components of Automotive Engine Design

Answer» CORRECT ANSWER is (a) 8.35mm

To EXPLAIN I WOULD SAY: t=0.045D+1.6

= 0.045×150+1.6

= 8.35mm
306.

Hoop stress is also known as ____________(a) circumferential stress(b) shear stress(c) shear strain(d) longitudinal stressI had been asked this question in an interview.My enquiry is from IC Engine in chapter Design of IC Engine Components of Automotive Engine Design

Answer»

Correct option is (a) circumferential stress

To EXPLAIN I would say: Hoop stress is ALSO known as Circumferential stress and it ACTS about the circumference of the cylinder. Hoop stress can also be called as tensile stress.

307.

Find the allowable circumferential stress for the material having Sut=190 and the Factor of safety is 4.(a) 47.5 N/mm^2(b) 47.5N/m^2(c) 760N/mm^2(d) 760N/m^2This question was posed to me in an interview for internship.I want to ask this question from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design

Answer»

Correct ANSWER is (a) 47.5 N/mm^2

The BEST I can EXPLAIN: σt=\(\frac{S_{UT}}{F_s}\)

= 190/4

=47.5N/mm^2

308.

What is a Reboring allowance?(a) It is the clearance between piston and cylinder(b) It is the additional metal thickness(c) It is the standard number to rebore(d) It is the allowance for the moment of the pistonThe question was asked by my college professor while I was bunking the class.Question is taken from IC Engine topic in section Design of IC Engine Components of Automotive Engine Design

Answer»

The correct option is (b) It is the ADDITIONAL metal thickness

The best explanation: REBORING allowance is the additional metal thickness that is REQUIRED to withstand maximum gas pressure. Also, when the cylinder wears out BASED on the availability of piston size the cylinder can be rebored.

309.

Engine cylinder is considered to be ______(a) conical(b) thick cylinder(c) thin cylinder(d) rectangularThe question was asked in quiz.The origin of the question is IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design

Answer»

The CORRECT choice is (c) thin cylinder

For explanation I would say: Engine cylinder is CONSIDERED to be a thin cylinder because the WALL thickness is 1/20 times the internal diameter. Conical and Rectangular sections are not used because the stresses are not equally DISTRIBUTED.

310.

Which of the below-mentioned test is used to find FP?(a) Calorimeter test(b) FIP test(c) Compression test(d) Morse testThe question was posed to me in an internship interview.I want to ask this question from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Answer»

Right answer is (d) MORSE TEST

The EXPLANATION: FP cannot be MEASURED practically, by performing more test i.e., short-circuiting the spark PLUG or the fuel supply and by calculation, FP can be calculated theoretically.

311.

In the formula IP=\(\frac{plan}{60}\), In what scale l(length) has to be considered?(a) mm(b) Km(c) m(d) µmI had been asked this question during a job interview.The above asked question is from IC Engine in division Design of IC Engine Components of Automotive Engine Design

Answer» RIGHT option is (c) m

To explain: Here length is always considered in meters as a standard, WHEREAS diameter is taken in mm, during the early AGE of engines the STROKE length was more when compared to bore diameter, µm gives value in 1000s and Km gives value in 0.0001, so the conventional unit meters.
312.

What is Frictional Power?(a) It is the power loss due to friction(b) It is the power generated by friction(c) It is the power generated by crankshaft bearings(d) It is the friction generated due to powerThe question was posed to me during an online interview.My enquiry is from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Answer»

Correct answer is (a) It is the power LOSS due to FRICTION

The BEST explanation: Engine is not 100% efficient, there is a power loss due to friction between the PISTON and the cylinder. Therefore, Frictional Power is the power loss due to friction.

313.

A 2-stroke engine has following specifications A=9852.3mm^2, IP=4600, Pm=0.35Mpa, N=500RPM. Calculate the value of length.(a) 80mm(b) 80m(c) 0.8mm(d) 8mI got this question by my school teacher while I was bunking the class.Question is taken from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Answer»

The CORRECT CHOICE is (a) 80mm

The explanation is: IP=\(\frac{PLAN}{60}\)

4600=(0.35×l×9852.3×1000)/60

l=80mm

314.

What is the Standard unit of Pm?(a) N/m^3(b) N/mm^2(c) KN/mm^2(d) KN/m^3The question was asked by my college professor while I was bunking the class.Question is taken from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

Answer»

Correct OPTION is (B) N/mm^2

Best EXPLANATION: Pm is called as mean effective pressure, the pressure is a force upon the UNIT area(N/mm^2). K is not a unit; it is a MULTIPLIER.

315.

What is the standard unit of BP?(a) KW(b) W(c) MW(d) N/mm^2This question was addressed to me in examination.My doubt stems from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Answer»

Right choice is (b) W

Explanation: BP is called Brake Power and the standard UNIT of power is Watt represented by ‘W’. K and M are just Multipliers and N/mm^2 is the unit for pressure.

316.

In the formula IP=\(\frac{plAn}{60}\), what does ‘n’ represent?(a) RPM of the engine(b) Number of working strokes(c) Area of cylinder(d) PressureI had been asked this question during an online exam.My question is taken from IC Engine topic in chapter Design of IC Engine Components of Automotive Engine Design

Answer»

The correct option is (b) Number of WORKING strokes

Easiest explanation: ‘n’ represents the number of working strokes, RPM is DENOTED by ‘N’, AREA is denoted by ‘A’ and pressure is denoted by ‘Pm’.

317.

In an engine running at 2200RPM has BP=35KW and FP=3KW, what is the value of IP?(a) 38KW(b) 38MW(c) 32KW(d) 32MWThe question was posed to me in class test.This intriguing question comes from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design

Answer»

The CORRECT OPTION is (a) 38KW

To EXPLAIN I WOULD SAY: IP=BP+FP

IP=35KW+3KW

=38KW

318.

An engine has a mechanical efficiency of 80% with an IP of 35KW, calculate BP.(a) 28MW(b) 2.8W(c) 2.8GW(d) 28KWThe question was posed to me in an interview.My question comes from IC Engine in section Design of IC Engine Components of Automotive Engine Design

Answer» RIGHT answer is (d) 28KW

To ELABORATE: ηmechanical=\(\frac{BP}{IP}\)

BP=(0.8×35)

=28KW
319.

The tachometer is used to measure the Indicated power.(a) True(b) FalseThis question was addressed to me by my college professor while I was bunking the class.This interesting question is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

Answer»

Right choice is (b) False

Easiest explanation: FIRST and foremost, INDICATED POWER can’t be measured practically using any device. Hence, Tachometer can’t be USED to measure the indicated power.

320.

Piston diameter can be considered as the cylinder bore diameter.(a) True(b) FalseI had been asked this question in exam.This interesting question is from IC Engine in chapter Design of IC Engine Components of Automotive Engine Design

Answer»
321.

Where is Indicated power generated?(a) In the crankshaft(b) In the alternator(c) Inside the engine cylinder(d) In the Fuel pumpThe question was asked during an online exam.This is a very interesting question from IC Engine in portion Design of IC Engine Components of Automotive Engine Design

Answer»

Correct answer is (C) Inside the engine cylinder

The BEST I can explain: Indicated power is obtained inside the engine cylinder, whereas brake power is obtained in the crankshaft, ALTERNATOR and fuel PUMP ABSORBS the brake power.

322.

In which type of cylinder liner cooling is more efficient?(a) Dry liner(b) Hot liner(c) Wet liner(d) Steel linerI have been asked this question in an online quiz.The doubt is from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design

Answer»

The correct answer is (C) WET liner

To EXPLAIN: Wet liners have direct contact with the coolant, there is no SEPARATE material between cylinder liner and cylinder. Hence cooling is more efficient in Wet liner.

323.

Why engine block has Cylinder for piston moment, why not cube or cuboidal?(a) The cylinder has good aesthetic(b) Stresses are equally distributed in the cylinder(c) Design rule(d) The cylinder doesn’t wearThis question was addressed to me in a national level competition.The above asked question is from IC Engine in chapter Design of IC Engine Components of Automotive Engine Design

Answer»

Right OPTION is (b) Stresses are equally distributed in the cylinder

To explain I would say: The joints in the CUBE or CUBOIDAL tend to crack because the stresses are not equally distributed over the entire surface and ALSO a LOT of friction is produced between the piston and the guiding surface. But in the cylinder, the stresses are equally distributed.

324.

Which of the mentioned below is not the desired property of the cylinder and cylinder liner?(a) It should be corrosion resistant(b) It should not be wear-resistant(c) It should withstand thermal stresses(d) It should be strong enough to withstand high gas pressureI had been asked this question during an online exam.I'm obligated to ask this question of IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

Answer»

The CORRECT option is (B) It should not be wear-resistant

The explanation: Cylinder GUIDES the piston MOMENT, in case there is a loss in lubrication, the cylinder should not wear off. So, the cylinder and cylinder liner should be wear-resistant.

325.

A cylinder has clearance length is 0.3mm and cylinder diameter is 150mm, what is the clearance volume?(a) 45mm^3(b) 0.45mm^3(c) 0.55mm^3(d) 0.045mm^3I got this question in an international level competition.I would like to ask this question from IC Engine topic in section Design of IC Engine Components of Automotive Engine Design

Answer»

The CORRECT choice is (a) 45mm^3

Easy EXPLANATION: CLEARANCE volume = Clearance length × Cylinder diameter

=0.3 × 150

= 45mm^3

326.

Which of the following are the two types of Cylinder liners?(a) Cold and Hot liners(b) Mild and Soft liners(c) Dry and Wet liners(d) Tungsten and Titanium LinersThis question was posed to me during an internship interview.This is a very interesting question from IC Engine topic in portion Design of IC Engine Components of Automotive Engine Design

Answer»

Correct answer is (c) Dry and Wet liners

Easiest EXPLANATION: The TWO TYPES of cylinder liners are Dry and Wet liners. Dry liners are the ONE which is not in DIRECT contact with that coolant and Wet liners have direct contact with the coolant

327.

Which of the mentioned below is a type of liner?(a) Cold liner(b) Hot liner(c) Dry liner(d) Cast iron linerThis question was posed to me during an internship interview.I want to ask this question from IC Engine in section Design of IC Engine Components of Automotive Engine Design

Answer»

Right CHOICE is (C) Dry liner

Easy explanation: There are two types of liners Dry liner and Wet liner, dry liners are the one which is not in direct contact with COOLANT. Wet liners are the one which has direct contact with the coolant.

328.

Usually, Cylinder liner is made up of what material?(a) Tungsten(b) Cast iron alloy(c) Aluminum alloy(d) Mild steelThis question was posed to me in an interview for internship.This interesting question is from IC Engine in division Design of IC Engine Components of Automotive Engine Design

Answer»

The correct answer is (b) Cast iron alloy

Best explanation: Cast iron along with chromium or VANADIUM is used as the cylinder LINER MATERIAL because of its low thermal expansion and LUBRICATION property.

329.

Why liners are used in the cylinder?(a) Having liner only with better-material can be more economical(b) Having liner results in low cost(c) Having liner only with better-material can be less economical(d) Having liner results in high costThe question was asked in an international level competition.Query is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

Answer» RIGHT OPTION is (a) Having LINER only with better-material can be more economical

The BEST explanation: By having cylinder liner only with better-material can be more economical instead of having all the material of the engine with a better grade of material.
330.

What type of cooling system is used in an early single-cylinder engine with cooling fins around it?(a) Coolant cooled(b) Air-cooled(c) Oil cooled(d) Water-cooledThis question was posed to me in an internship interview.Enquiry is from IC Engine topic in division Design of IC Engine Components of Automotive Engine Design

Answer»

Correct choice is (b) Air-cooled

Explanation: The early single-cylinder ENGINE has cooling FINS around. The heat from the cylinder is passed through the surface of the fins and when it is EXPOSED to a CURRENT of air the engine cools.

331.

In modern engines, the cylinder is made of what material?(a) Cast iron(b) Tin(c) Steel(d) AluminumThe question was asked during an internship interview.This intriguing question originated from IC Engine in section Design of IC Engine Components of Automotive Engine Design

Answer»

Correct answer is (d) Aluminum

Explanation: Earlier CAST iron was USED as the CYLINDER material, but due to its heavyweight, modern cars use Aluminum which resulted in BETTER efficiency.

332.

What is the stoichiometric ratio of the Air + Gasoline mixture?(a) 14.5:1(b) 1:14.5(c) 14.7:1(d) 14.3:1The question was asked by my college professor while I was bunking the class.I would like to ask this question from Internal Combustion Engine topic in section Design of IC Engine Components of Automotive Engine Design

Answer»

Right OPTION is (c) 14.7:1

To elaborate: The stoichiometric RATIO of AIR + Gasoline mixture is 14.7:1 which MEANS 14.7 parts of air are REQUIRED to burn 1 part of the fuel.

333.

What is the primary function of the cylinder in the engine?(a) To hold the crankshaft(b) To guide the camshaft(c) To guide the piston(d) To hold the valvesI had been asked this question in semester exam.I would like to ask this question from IC Engine in chapter Design of IC Engine Components of Automotive Engine Design

Answer»

Correct ANSWER is (c) To guide the piston

The best I can EXPLAIN: The two PRIMARY functions of the cylinder is to ACT as the COMBUSTION chamber in the engine and to guide the piston movement. The crankshaft’s function is to transfer rotary motion.

334.

What is the compression ratio of the Diesel engine?(a) 15:1 to 23:1(b) 9:1 to 14:1(c) 1:15 to 1:23(d) 1:9 to 1:14This question was posed to me during an online exam.Enquiry is from Internal Combustion Engine in section Design of IC Engine Components of Automotive Engine Design

Answer»

The correct answer is (a) 15:1 to 23:1

The explanation: The compression ignition has no spark PLUG to ignite the fuel. So, the charge is COMPRESSED to HIGH PRESSURE to self-ignite and the compression ratio RANGES from 15:1 to 23:1.

335.

The Wankel engine is also called a Rotary engine.(a) True(b) FalseI have been asked this question by my college director while I was bunking the class.Question is taken from Internal Combustion Engine in division Design of IC Engine Components of Automotive Engine Design

Answer» CORRECT CHOICE is (a) True

Explanation: The WANKEL engine USES an ECCENTRIC rotary design to convert power to Rotary motion. Hence, the Wankel engine is also called a rotary engine.
336.

Who invented the Compression ignition engine?(a) Issac Newton(b) Rudolf Diesel(c) Nikolaus August Otto(d) Albert EinsteinThis question was posed to me in my homework.My enquiry is from Internal Combustion Engine in division Design of IC Engine Components of Automotive Engine Design

Answer»

Correct CHOICE is (b) Rudolf Diesel

For explanation I would say: The COMPRESSION ignition engine is also KNOWN as the Diesel engine and it was invented by Rudolf diesel in the 1890s. Nikolaus August OTTO invented the SI engine. Issac Newton defined FORCES and Albert Einstein worked in the field of space and light.

337.

Which of the mentioned below is the external combustion engine?(a) Wankel engine(b) Steam engine(c) Petrol engine(d) VTEC engineThe question was asked during an internship interview.My question is based upon Internal Combustion Engine in portion Design of IC Engine Components of Automotive Engine Design

Answer» CORRECT ANSWER is (b) STEAM engine

The explanation is: The Steam engine is an example of an external combustion engine that uses steam as the WORKING fluid to produce ENERGY. The steam is produced externally by burning coal.
338.

Which is the first company to use assembly line mode for the production of cars?(a) Fiat(b) Mercedes Benz(c) Ford(d) VolvoI had been asked this question during an online exam.My enquiry is from Internal Combustion Engine topic in section Design of IC Engine Components of Automotive Engine Design

Answer» RIGHT option is (c) Ford

For EXPLANATION: Henry ford in the year 1908 started the first mass production of CAR Model T using assembly line mode of production. Benz invented the first car. Fiat and Volvo emerged LATER on in the automotive industry.
339.

Which of the mentioned below is not a component of the IC engine?(a) Piston(b) Cylinder(c) Wheel(d) Spark plugThis question was posed to me in a job interview.I need to ask this question from Internal Combustion Engine in chapter Design of IC Engine Components of Automotive Engine Design

Answer» RIGHT option is (C) Wheel

The explanation: Piston, Cylinder, Spark plug are the components of the IC engine whereas the wheel ABSORBS the power from the IC engine and produces a tractive FORCE that helps in moving the vehicle.
340.

The black smoke coming out of a petrol engine is due to what particles?(a) Oxygen molecules(b) Magnesium particles(c) Nitrox(d) Carbon particlesThis question was posed to me by my school principal while I was bunking the class.My question is based upon Internal Combustion Engine topic in section Design of IC Engine Components of Automotive Engine Design

Answer»

The CORRECT choice is (d) CARBON particles

To elaborate: The BLACK smoke is due to the presence of carbon particles which is formed because of incomplete combustion caused by less amount of air to the supplied FUEL.

341.

How many power strokes are produced in a 4-stroke diesel engine running at 1500RPM?(a) 750(b) 1500(c) 1000(d) 375I have been asked this question in an internship interview.Asked question is from Internal Combustion Engine topic in section Design of IC Engine Components of Automotive Engine Design

Answer»

The correct option is (a) 750

Best EXPLANATION: In a 4-stroke engine the power stroke is PRODUCED in every two rotation of the crankshaft.

Number of power STROKES=\(\FRAC{RPM}{number \, of \, crank \, rotation \, for \, one \, complete \, rotation \, of \, the \, flywheel}\)

Hence, \(\frac{1500}{2}=750\)

342.

Who invented the first car which used gasoline as fuel?(a) Rudolf Diesel(b) Nikola Tesla(c) Nikolaus Otto(d) Karl BenzI had been asked this question in class test.I need to ask this question from Internal Combustion Engine in section Design of IC Engine Components of Automotive Engine Design

Answer»

The correct choice is (d) Karl BENZ

To explain: Karl Benz invented the first car which used gasoline/petrol as FUEL. Rudolf diesel discovered diesel and Nikolaus Otto discovered petrol ENGINE. Nikola Tesla discovered AC.

343.

Otto cycle is used in which engine?(a) External combustion engine(b) Petrol engine(c) Diesel engine(d) Steam engineI had been asked this question in a job interview.My doubt stems from Internal Combustion Engine topic in chapter Design of IC Engine Components of Automotive Engine Design

Answer»

Correct choice is (b) Petrol engine

The best explanation: OTTO cycle EXPLAINS the working of a petrol engine for each stroke that TAKES place. The DIESEL engine USES a diesel cycle. The steam engine is a part of the external combustion engine and they don’t follow the Otto cycle.

344.

What is an internal combustion engine?(a) An engine that absorbs power by burning air+ water in a closed chamber(b) An engine that generates power by burning air+ fuel in a closed chamber(c) An engine that generates power by burning air+ fuel in an open chamber(d) An engine that absorbs power by burning air+ water in an open chamberThe question was posed to me in a national level competition.This question is from Internal Combustion Engine topic in chapter Design of IC Engine Components of Automotive Engine Design

Answer»

The correct answer is (b) An engine that generates power by BURNING air+ fuel in a CLOSED chamber

The explanation is: Internal COMBUSTION ENGINES are the engine that generates power by burning air and fuel (petrol, diesel, KEROSENE, etc..) in a closed chamber. Nothing can burn in the presence of water because water is a fire extinguisher.

345.

What was used as fuel during the early invention of IC engines?(a) Gun-powder(b) Petrol(c) Potassium(d) KeroseneThe question was posed to me in an interview.This intriguing question originated from Internal Combustion Engine in portion Design of IC Engine Components of Automotive Engine Design

Answer»

Correct answer is (a) Gun-powder

The best EXPLANATION: In the 1600s, Gun powder was available as explosive, Huygen invented and ENGINE that USES GUNPOWDER as the FUEL. Petrol and kerosene didn’t exist in those days and potassium is not used in the engine till today.

346.

Anything which burns in the presence of ______ is known as combustion.(a) water(b) fuel(c) air(d) saltThis question was posed to me in homework.This intriguing question comes from Internal Combustion Engine in division Design of IC Engine Components of Automotive Engine Design

Answer»

The correct answer is (c) air

The BEST explanation: Fuel(solid, liquid or gas) always NEED oxygen to get combusted and the air is the only source for the AVAILABILITY of oxygen. Hence, anything which burns in the presence of air is known as COMBUSTION.

347.

What is the idling RPM of a motorcycle petrol engine?(a) 1200RPM(b) 700RPM(c) 18000RPM(d) 60RPMI got this question during an interview.My enquiry is from Internal Combustion Engine topic in portion Design of IC Engine Components of Automotive Engine Design

Answer»

The correct answer is (a) 1200RPM

The EXPLANATION: Idling RPM of a petrol ENGINE is 1200 and for diesel engines, it is 700, WHEREAS 18000 RPM is maximum RPM for SUPERBIKE and 60 doesn’t exist.