Explore topic-wise InterviewSolutions in .

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.

51.

What is the coefficient of fluctuation of energy?(a) The ratio of the maximum fluctuation of energy to the minimum fluctuation of energy(b) The ratio of the maximum fluctuation of energy to the work done per cycle(c) The ratio of the minimum fluctuation of energy to the maximum fluctuation of energy(d) The ratio of the work done per cycle to the maximum fluctuation of energyThis question was addressed to me during an interview.Query is from Flywheel in chapter Internal Combustion Engines of Automobile Engineering

Answer»

Correct answer is (b) The ratio of the maximum fluctuation of energy to the work DONE per cycle

The best explanation: The coefficient of fluctuation of energy (CE) is the ratio of the maximum fluctuation of energy to the work done per cycle. CE =\(\FRAC{\DELTA E}{T_{mean} \theta}\) where ΔE = maximum fluctuation of energy, Tmean*θ = work done per cycle, Tmean = mean TORQUE, and θ = angle turned in radian in ONE cycle.

52.

What is the maximum fluctuation of energy?(a) It is the sum of maximum and minimum energies(b) It is the ratio of the maximum and minimum energies(c) It is the ratio of the mean resisting torque to the work done per cycle(d) It is the difference between the maximum and minimum energiesI have been asked this question in an online quiz.My question is based upon Flywheel in division Internal Combustion Engines of Automobile Engineering

Answer»

Correct option is (d) It is the difference between the maximum and minimum ENERGIES

Best explanation: The maximum fluctuation of energy is the difference between the maximum and minimum energies. The fluctuation of energy can be FOUND out by the TURNING moment diagram for ONE complete cycle of operation.

53.

In the cam, the distance between the base circle and the nose is called ______(a) Lift(b) Lobe(c) Flank(d) PitchThis question was addressed to me during an online interview.Asked question is from IC Engine Crankshaft and Camshaft in division Internal Combustion Engines of Automobile Engineering

Answer»

The CORRECT option is (a) Lift

To ELABORATE: DISTANCE between the base circle and nose is CALLED lift of cam.

54.

If the diameter of a piston is ‘D’ then the length of skirt is usually of the range of ___________(a) 0.75D to 0.8D(b) 0.5D to D(c) 1.5D to 2D(d) 0.2D to 0.6DI had been asked this question during an interview for a job.My question is from Automobile topic in portion Internal Combustion Engines of Automobile Engineering

Answer» CORRECT CHOICE is (a) 0.75D to 0.8D

Easiest explanation: The length of the skirt is usually 0.75 to 0.8 times the diameter of the PISTON.
55.

Piston rings are not completely closed because __________(a) Closed rings are hard to manufacture(b) Gap allows the ring to expand and fit over(c) They are designed to let pass some lubricant to the combustion chamber(d) None of the mentionedI got this question in examination.Query is from Automobile in section Internal Combustion Engines of Automobile Engineering

Answer» RIGHT answer is (b) Gap allows the ring to expand and FIT over

Easy explanation: PISTON rings expand DUE to heat of combustion and fit over.
56.

Heat rejection in diesel cycle is at _________(a) Constant pressure(b) Constant volume(c) Constant temperature(d) None of the mentionedI got this question during an internship interview.The query is from Development of IC Engines topic in chapter Internal Combustion Engines of Automobile Engineering

Answer»

The CORRECT OPTION is (b) CONSTANT volume

To elaborate: Heat rejection in DIESEL cycle occurs at constant volume.

57.

A heat engine converts heat energy from fuel combustion or any other source into which type of work?(a) Electrical work(b) Mechanical work(c) Pressure work(d) None of the mentionedI have been asked this question in an internship interview.I'm obligated to ask this question of Heat Engines in chapter Internal Combustion Engines of Automobile Engineering

Answer»

The correct choice is (b) Mechanical work

To ELABORATE: A heat engine GIVES mechanical work as output. In a heat engine, input is GIVEN in the FORM of heat and this heat is converted into mechanical work. The remaining heat which is not converted into work is EXHAUSTED.

58.

Which of the following is true about the flywheel?(a) Flywheel regulates speed over a period of time(b) Flywheel takes care of the quantity of fluid(c) Flywheel controls \(\frac{dN}{dt}\)(d) Flywheel regulates the speed by regulating the quantity of charge of the prime moverThis question was posed to me during an interview for a job.My question is from Flywheel topic in portion Internal Combustion Engines of Automobile Engineering

Answer»

Right option is (C) Flywheel controls \(\frac{dN}{DT}\)

The best I can EXPLAIN: Flywheel controls the rate of fluctuation of the speed during a cycle. Flywheel controls the speed in one cycle. It does not control the SUPPLY of fuel to the engine.

59.

The purpose of valve clearance is to(a) Allow the valve to expand(b) Allow the sliding of valve in the guide(c) Ensure that the valve closes fully(d) Ensure that the crankshaft is free to rotateThis question was posed to me in an interview for job.This interesting question is from Engine Valves and their Mechanisms topic in section Internal Combustion Engines of Automobile Engineering

Answer»

The correct option is (c) Ensure that the VALVE CLOSES fully

The EXPLANATION: Valve CLEARANCE ENSURES that valve closes completely.

60.

In a four stroke engine each cylinder has(a) One valve(b) Two valves(c) Three valves(d) Four valvesI had been asked this question in an international level competition.My query is from Engine Valves and their Mechanisms topic in division Internal Combustion Engines of Automobile Engineering

Answer» CORRECT CHOICE is (b) Two valves

Easiest EXPLANATION: A four stroke ENGINE cylinder has one intake and one EXHAUST valve.
61.

Camshaft gear is made from which material?(a) Cast iron(b) Mild steel(c) Bakelite(d) BrassThis question was posed to me at a job interview.This intriguing question comes from IC Engine Crankshaft and Camshaft in portion Internal Combustion Engines of Automobile Engineering

Answer»

The CORRECT answer is (C) Bakelite

Easiest EXPLANATION: Camshaft GEARS are MADE from bakelite.

62.

Compression rings have which type of cross section __________(a) Rectangular(b) L shaped(c) Keystone(d) All of the mentionedThis question was addressed to me in an international level competition.My question is based upon Automobile topic in portion Internal Combustion Engines of Automobile Engineering

Answer»

Correct ANSWER is (d) All of the mentioned

To EXPLAIN I WOULD say: All the GIVEN are TYPES of Compression ring cross sections.

63.

The escape of burned gases from the combustion chamber past the pistons and into the crankcase is called _______(a) Gas loss(b) Blow by(c) By pass(d) Passed gasThis question was posed to me in an international level competition.I'm obligated to ask this question of Automobile Engineering in chapter Internal Combustion Engines of Automobile Engineering

Answer»

The correct ANSWER is (b) Blow by

The EXPLANATION is: Blow by is the surging of burned GASES from combustion chamber into the crankcase.

64.

When considerable material must be removed to clean up a cylinder bore, the cylinder should be _______(a) Bored(b) Honed(c) Ground(d) ReamedI got this question at a job interview.Question is taken from Parts of an IC Engine Cylinder and Liner topic in section Internal Combustion Engines of Automobile Engineering

Answer» RIGHT choice is (a) Bored

Explanation: Boring OPERATION can easily REMOVE the required material.
65.

The angle between two cylinders in a two cylinder V-type engine is usually(a) 15 degrees(b) 45 degrees(c) 60 degrees(d) 90 degreesThe question was asked in a job interview.The above asked question is from Applications of IC Engines in division Internal Combustion Engines of Automobile Engineering

Answer»

The correct option is (c) 60 degrees

Best explanation: V-type engines have two CYLINDER banks which make 60 degree angle to each other. It has a number of PISTON same as the number of cylinders in each BANK and they are connected to the same crankshaft.

66.

On modern four stroke engines the exhaust valve opens just(a) Before TDC(b) After TDC(c) Before BDC(d) After BDCI have been asked this question by my school teacher while I was bunking the class.I need to ask this question from Engine Valves and their Mechanisms topic in section Internal Combustion Engines of Automobile Engineering

Answer»

The correct CHOICE is (c) Before BDC

Easiest explanation: Exhaust valve OPENS before the PISTON reaches BOTTOM Dead Centre.

67.

The crankshaft rotates the camshaft using _______(a) Belt drive(b) Chain drive(c) Gear drive(d) Motor driveI have been asked this question by my school principal while I was bunking the class.Query is from IC Engine Crankshaft and Camshaft in portion Internal Combustion Engines of Automobile Engineering

Answer» CORRECT choice is (b) Chain drive

Easy EXPLANATION: Chain drive is USED to connect CRANKSHAFT and camshaft.
68.

The gears on camshaft and crankshaft are known as ________(a) Lining gears(b) Aligning gears(c) Timing gears(d) Tuning gearsThis question was posed to me by my college professor while I was bunking the class.My question comes from IC Engine Crankshaft and Camshaft in section Internal Combustion Engines of Automobile Engineering

Answer»

The correct option is (c) Timing gears

The explanation: These gears are CALLED timing gears. Timing gears connect CAMSHAFT to the crankshaft. Timing gears provide 2:1 gear reduction for FOUR STROKE engines.

69.

Compression rings are fitted at the _________(a) Middle of skirt(b) Bottom of skirt(c) Top of skirt(d) None of the mentionedI had been asked this question by my school principal while I was bunking the class.This is a very interesting question from Automobile in portion Internal Combustion Engines of Automobile Engineering

Answer»

The CORRECT choice is (C) Top of skirt

The explanation is: COMPRESSION RINGS are located at the top of skirt.

70.

What is the material of the connecting rod?(a) Mild steel(b) Forged steel(c) Tool steel(d) Cast ironThe question was asked in an interview for internship.My question comes from Automobile topic in section Internal Combustion Engines of Automobile Engineering

Answer»

Correct choice is (b) FORGED STEEL

To explain: Connecting ROD is MADE of forged steel because the connecting rod should have light weight and HIGH resistance. Connecting rod in the engine should be lightweight because it provides proper balance to the engine and it should have high strength because it goes through cyclic stress.

71.

In four cylinder engines the ignition advance depends on _________(a) Quality of fuel(b) Engine speed(c) Cylinder dimensions(d) Quality of fuel and engine speedI got this question in an interview for job.Question is from Energy Cycle in division Internal Combustion Engines of Automobile Engineering

Answer»

Correct answer is (d) QUALITY of FUEL and engine speed

The BEST explanation: Ignition advance depends on both quality of fuel and engine speed.

72.

The valves of an ic engine are made to open and close slowly to _________(a) Increase the engine efficiency(b) Decrease the fuel consumption(c) Allow engine to cool in the meantime(d) Provide silent operation under high speed conditionsThis question was addressed to me in unit test.This question is from Development of IC Engines topic in division Internal Combustion Engines of Automobile Engineering

Answer» CORRECT option is (d) Provide SILENT operation under high speed conditions

Best explanation: The VALVES are made to open and close SLOWLY to provide silent operation under high speed conditions.
73.

The crankshaft should be inspected for ______(a) Cracks(b) Alignment of crankpins and journals(c) Cleanliness of oil gallaries(d) All of the mentionedI had been asked this question during an interview for a job.I would like to ask this question from IC Engine Crankshaft and Camshaft topic in section Internal Combustion Engines of Automobile Engineering

Answer»

Right CHOICE is (d) All of the MENTIONED

For explanation I would SAY: CRANKSHAFT should be inspected for all the above mentioned faults.

74.

The function of a piston is ____________(a) It forms a movable wall of combustion chamber(b) It transmits turning force to the crankshaft via connecting rod(c) It functions like crosshead and transmits side thrusts(d) All of the mentionedThe question was posed to me in an international level competition.My question is taken from Automobile in division Internal Combustion Engines of Automobile Engineering

Answer»

Correct CHOICE is (d) All of the MENTIONED

The EXPLANATION is: A PISTON performs all the above mentioned FUNCTIONS.

75.

The difference between dry liners and wet liners is __________(a) Cylinder liner touches the coolant jacket in wet liners(b) Wet liners are thicker than dry liners(c) Packing rings are present in wet liners(d) All of the mentionedI have been asked this question in class test.Enquiry is from Parts of an IC Engine Cylinder and Liner topic in division Internal Combustion Engines of Automobile Engineering

Answer» RIGHT ANSWER is (d) All of the mentioned

Explanation: All the GIVEN DIFFERENCES exist between wet and DRY liners.
76.

In a four stroke S.I engine the exhaust valve usually opens ______(a) At BDC(b) 35 degree to 60 degree before BDC(c) 35 degree to 60 degree after BDC(d) 10 degree to 20 degree before BDCThis question was posed to me in an international level competition.Query is from Energy Cycle topic in division Internal Combustion Engines of Automobile Engineering

Answer»

The correct option is (b) 35 DEGREE to 60 degree before BDC

The best I can explain: Exhaust valve OPENS at 35 degree to 60 degree before BDC.

77.

The opening and closing of a valve is respectively done by(a) A cam and a spring(b) A spring and a cam(c) Gas pressure and cam(d) Cylinder vacuum and springI got this question in an online quiz.This intriguing question originated from Engine Valves and their Mechanisms in section Internal Combustion Engines of Automobile Engineering

Answer» RIGHT ANSWER is (a) A cam and a spring

To elaborate: An ENGINE valve is opened by a cam and CLOSED by a spring.
78.

The device used to measure the clearance between the valve and tappet of an IC Engine is(a) Feeler gauge(b) Snap gauge(c) Slip gauge(d) MicrometerThe question was asked in exam.My question comes from Engine Valves and their Mechanisms in section Internal Combustion Engines of Automobile Engineering

Answer»

Right option is (a) FEELER gauge

Easy EXPLANATION: A Feeler gauge is used to measure the CLEARANCE.

79.

In general, What type of section is used for connecting rods?(a) Forged I-section(b) Forged round section(c) Cast iron square section(d) Forged square section steelI got this question during an interview.I would like to ask this question from Automobile Engineering in division Internal Combustion Engines of Automobile Engineering

Answer»

Correct choice is (a) Forged I-section

Easy EXPLANATION: Connecting RODS are GENERALLY of forged I-section type because I-section have higher MODULUS per unit area in comparison to other SECTIONS. I-section is highly resistant to buckling and bending.

80.

The function of crankcase in two stroke petrol engines is _________(a) It lower downs the temperature(b) It forms a pressurised chamber for fuel air mixture(c) It holds the exhaust gases after combustion(d) None of the mentionedI have been asked this question in an international level competition.The doubt is from Automobile Engineering in chapter Internal Combustion Engines of Automobile Engineering

Answer»

Correct answer is (b) It FORMS a pressurised chamber for FUEL air MIXTURE

The best explanation: The crankcase of a TWO stroke engine forms a pressurised air fuel mixture for combustion. It also prevents the atmospheric air or other particles from entering into the chamber.

81.

In a diesel engine the pressure during combustion may increase to a range at _________(a) 10-15 atm(b) 15-20 atm(c) 20-30 atm(d) 55-75 atmI have been asked this question in an interview.I want to ask this question from Energy Cycle in portion Internal Combustion Engines of Automobile Engineering

Answer» CORRECT answer is (d) 55-75 atm

To elaborate: Pressure can increase as high as 55 to 75 atm during combustion in diesel engine.
82.

A gas undergoes isothermal compression in Carnot cycle. Which step does it undergo?(a) 1st(b) 2nd(c) 3rd(d) 4thThis question was posed to me in final exam.I would like to ask this question from Heat Engines topic in section Internal Combustion Engines of Automobile Engineering

Answer»

The correct choice is (C) 3RD

For EXPLANATION I WOULD say: Isothermal compression is the 3rd step in Carnot CYCLE.

83.

A steam engine comes under the category of ________(a) External combustion engines(b) Internal combustion engines(c) All of the mentioned(d) None of the mentionedThe question was posed to me in an international level competition.My question is from Heat Engines topic in section Internal Combustion Engines of Automobile Engineering

Answer»

Correct option is (a) External COMBUSTION engines

To elaborate: A steam engine is an External combustion engine. Steam engine is a TYPE of heat engine in which heat is used as an input and this heat is CONVERTED into mechanical work. Steam PUSHES the piston and reciprocating motion of the piston is converted into ROTARY motion.

84.

On modern four stroke engines the inlet valve opens just(a) Before TDC(b) After TDC(c) Before BDC(d) After BDCThis question was addressed to me by my school principal while I was bunking the class.Question is taken from Engine Valves and their Mechanisms in portion Internal Combustion Engines of Automobile Engineering

Answer» CORRECT option is (a) Before TDC

To ELABORATE: INLET valve opens before the piston reaches Top DEAD Centre.
85.

Aluminium cylinder blocks require __________(a) Cast iron Liners(b) Brass Liners(c) Aluminium Liners(d) No LinersThis question was posed to me by my school principal while I was bunking the class.The origin of the question is Parts of an IC Engine Cylinder and Liner topic in section Internal Combustion Engines of Automobile Engineering

Answer»

The correct option is (a) Cast IRON Liners

Explanation: Cast iron is the best suited Liner MATERIAL for ALUMINIUM cylinders. Aluminium is used for these types of cylinder blocks because it has higher heat conduction and it is GOOD for ENGINE cooling. It also prevents abnormal combustion.

86.

Which of these is a power absorbing heat engine?(a) Steam engine(b) Petrol engine(c) Air compressor(d) None of the mentionedThis question was posed to me during an interview.I'm obligated to ask this question of Heat Engines in division Internal Combustion Engines of Automobile Engineering

Answer» CORRECT choice is (c) AIR COMPRESSOR

To explain: An air compressor is a power absorbing heat engine.
87.

A square type engine is a type of engine which ________(a) Has geometrically square shape(b) Has two vertical and two horizontal cylinders(c) Has cylinder bore length equal to stroke length(d) None of the mentionedI had been asked this question during an online interview.My question is from Parts of an IC Engine Cylinder and Liner in chapter Internal Combustion Engines of Automobile Engineering

Answer» CORRECT OPTION is (c) Has cylinder BORE length equal to STROKE length

Explanation: A square type ENGINE has cylinder bore length equal to cylinder stroke length.
88.

In two-stroke cycle engines, what replaces valves of a four-stroke engine?(a) Fins(b) Notches(c) Ports(d) TubesI have been asked this question in a national level competition.My doubt is from Development of IC Engines in division Internal Combustion Engines of Automobile Engineering

Answer»

Right answer is (c) Ports

Easy EXPLANATION: Valves are replaced by ports in two-stroke engines. Two-stroke ENGINE takes two strokes of piston to complete one REVOLUTION of the crankshaft. It also COMPLETES the cycle in two strokes.

89.

Given that maximum fluctuation of energy is 2000 N-m/s and coefficient of fluctuation of speed is 0.02. What is the mean kinetic energy of flywheel?(a) 50 kN-m/s(b) 40 kN-m/s(c) 30 kN-m/s(d) 20 kN-m/sThis question was addressed to me during an interview.Asked question is from Flywheel topic in chapter Internal Combustion Engines of Automobile Engineering

Answer»

Correct answer is (a) 50 kN-m/s

To ELABORATE: The maximum fluctuation of ENERGY in a FLYWHEEL = ΔE, mean kinetic energy of the flywheel = E, and coefficient of fluctuation of SPEED = Cs. ΔE = 2*E*Cs ⇒ 2000 = 2*E*0.02 ⇒ E = 50 kN-m/s.

90.

The size of the engine intake valve is(a) Same as that of exhaust valve(b) Smaller than that of exhaust valve(c) Larger than that of exhaust valve(d) Does not depend upon the size of exhaust valveI had been asked this question in class test.My question is taken from Engine Valves and their Mechanisms topic in division Internal Combustion Engines of Automobile Engineering

Answer»

Right CHOICE is (b) SMALLER than that of EXHAUST VALVE

The best explanation: The exhaust valve is made BIGGER in size than the intake valve.

91.

Cylinder liner materials are made of alloy iron containing ____________(a) Manganese(b) Nickel(c) Chromium(d) All of the mentionedThe question was posed to me during an interview for a job.I'd like to ask this question from Parts of an IC Engine Cylinder and Liner topic in portion Internal Combustion Engines of Automobile Engineering

Answer»

Correct choice is (d) All of the mentioned

To explain: LINER is MADE of alloy iron containing silicon, MANGANESE, nickel and chromium.

92.

The expansion process in diesel engine is ________(a) Isothermal(b) Adiabatic(c) Isobaric(d) None of the mentionedThe question was asked in an international level competition.My question comes from Development of IC Engines in section Internal Combustion Engines of Automobile Engineering

Answer» RIGHT choice is (B) Adiabatic

Explanation: Adiabatic EXPANSION OCCURS in diesel CYCLE.
93.

Which of these is not a cylinder head type of an ic engine?(a) L head(b) I head(c) T head(d) X headI got this question in an interview.Query is from Applications of IC Engines topic in division Internal Combustion Engines of Automobile Engineering

Answer»

Right OPTION is (d) X HEAD

To EXPLAIN I WOULD say: X head type engines are not in use. The mail cylinder heads used are L-type, I-type, T-type, F-type.

94.

The angle in degrees moved by the crankshaft of a four cylinder engine between firing impulses is _________(a) 90(b) 180(c) 360(d) 720I got this question during an interview for a job.This intriguing question originated from Energy Cycle topic in section Internal Combustion Engines of Automobile Engineering

Answer»

Right answer is (b) 180

Best explanation: As engines are alternately fired so the ANGLE MOVED by crankshaft decreases to 180 between firing IMPULSES.

95.

Which one of the following is a type of Gasket?(a) Copper asbestos(b) Steel asbestos(c) Single sheet rigid(d) All of the mentionedThe question was posed to me in examination.My question is taken from Automobile topic in division Internal Combustion Engines of Automobile Engineering

Answer»

The correct OPTION is (d) All of the mentioned

The EXPLANATION is: All the THREE are various types of gaskets.

96.

W-type arrangement in twelve and sixteen cylinder engines has ______(a) One row of cylinders(b) Two rows of cylinders(c) Three rows of cylinders(d) Four rows of cylindersI got this question in an online quiz.My doubt stems from Applications of IC Engines topic in section Internal Combustion Engines of Automobile Engineering

Answer» CORRECT ANSWER is (c) Three rows of cylinders

The best EXPLANATION: W type arrangement has three rows of cylinders.
97.

Which of the following is not an arrangement of ic engine cylinders?(a) Radial(b) Circular(c) V type engine(d) Opposed cylinder engineThe question was asked by my school teacher while I was bunking the class.Question is taken from Applications of IC Engines topic in division Internal Combustion Engines of Automobile Engineering

Answer»

Correct OPTION is (b) Circular

Explanation: Circular ARRANGEMENT is not USED for ic ENGINE cylinders.

98.

Higher efficiency in Otto cycle can be achieved by _______(a) Increasing the compression ratio(b) Decreasing the compression ratio(c) Keeping the compression ratio constant(d) Efficiency does not depend on compression ratioI had been asked this question during an internship interview.Origin of the question is Development of IC Engines topic in chapter Internal Combustion Engines of Automobile Engineering

Answer» CORRECT OPTION is (a) Increasing the COMPRESSION ratio

To explain: Higher efficiency can be achieved by increasing the compression ratio.
99.

One ‘ton of refrigeration’ equals how much Btu/hr.(a) 14,500 Btu/hr(b) 12,000 Btu/hr(c) 13,000 Btu/hr(d) 15,000 Btu/hrI got this question in examination.I want to ask this question from Heat Engines in chapter Internal Combustion Engines of Automobile Engineering

Answer»

Correct choice is (B) 12,000 Btu/hr

Easy explanation: ONE “ton of REFRIGERATION (TR or TOR)” is equivalent to 12,000 Btu/hr or 3.5 kW. It is the unit of power which is used to describe the heat EXTRACTION capacity of a refrigeration or AIR conditioning equipment.

100.

In the single-cylinder, single acting, four-stroke gas engine, the total fluctuation of speed is not to exceed ±3 percent of the mean speed. What is the coefficient of fluctuation of speed?(a) 0.04(b) 0.03(c) 0.09(d) 0.06The question was posed to me by my college director while I was bunking the class.My question is from Flywheel in section Internal Combustion Engines of Automobile Engineering

Answer»

The correct answer is (d) 0.06

Easy explanation: Since the total fluctuation of SPEED is not to EXCEED ±3 PERCENT of the mean speed, therefore ω1 – ω2 = 6% ω and coefficient of fluctuation of speed = Cs = (ω1 – ω2)/ω = 0.06.