118 + Interview Questions in Internal Combustion Engines in Automobile Engineering Page 1 InterviewSolution

1.	The two-stroke engine is easy to manufacture.(a) True(b) FalseThis question was posed to me by my school principal while I was bunking the class.This key question is from 2 Stroke Engines in chapter Internal Combustion Engines of Automobile Engineering
Answer» RIGHT answer is (a) True Explanation: Since the two-stroke engine has no valves and VALVE actuating mechanism, it is simple in making. This makes it easy to manufacture. ALSO, the flywheel in the two-stroke engine is lighter.

Discussion

2.	What is the delivery ratio of the crankcase scavenged engine?(a) Greater than 1(b) Less than 1(c) Equal to 1(d) Greater than 2This question was addressed to me during an online exam.I would like to ask this question from 2 Stroke Engines in division Internal Combustion Engines of Automobile Engineering
Answer» Right answer is (c) EQUAL to 1 To explain I would say: The delivery ratio is the ratio of the air delivered to the reference volume or ratio of the mass of fresh air delivered to the reference mass. Rdel = Vdel / V REF or Rdel = Mdel/Mref. The delivery ratio usually varies between 1.2 and 1.5 except for crankcase scavenged ENGINES it is LESS than 1.

Discussion

3.	How much power will two-stroke engine of the same size as the four-stroke engine develop at the same speed?(a) Four times the power(b) Twice the power(c) Half the power(d) Same powerThis question was addressed to me in examination.My doubt is from 2 Stroke Engines in chapter Internal Combustion Engines of Automobile Engineering
Answer» The correct choice is (B) Twice the POWER To explain I WOULD say: The two-stroke engine produces twice the power PRODUCED by the four-stroke engine. The power stroke happens in every one revolution in a two-stroke engine.

Discussion

4.	Which of the following is not an advantage of a two-stroke engine?(a) Not valves(b) Lighter flywheel(c) More uniform torque(d) No lubrication systemThe question was asked in a job interview.Enquiry is from 2 Stroke Engines topic in portion Internal Combustion Engines of Automobile Engineering
Answer» Correct ANSWER is (d) No lubrication system Explanation: The two-stroke engines do not have valves. DUE to which it makes them easy to manufacture. Also, the two-stroke ENGINE has a lighter flywheel. That is the reason the two-stroke engine PRODUCES the more UNIFORM torque.

Discussion

5.	For two-stroke SI engine, the scavenging efficiency is 0.5, cylinder volume of 1200 cc and the scavenging density is 1.3 kg/m^3. What is the mass flow rate of air per cycle?(a) 0.00072 kg/cycle(b) 0.00076 kg/cycle(c) 0.00074 kg/cycle(d) 0.00084 kg/cycleThis question was posed to me in an interview.The above asked question is from 2 Stroke Engines topic in portion Internal Combustion Engines of Automobile Engineering
Answer» The correct ANSWER is (a) 0.00072 kg/cycle The explanation is: SCAVENGING density = ρsc = 1.3 kg/m^3, total cylinder volume = Vtot = 1200cc, MASS flow RATE of air = ṁ a and the scavenging efficiency = ηsc = 0.5, ηsc = ṁa / (Vtot * ρsc) = ṁ a = Vtot * ρsc * ηsc = 0.0012 * 1.3 * 0.5 = 0.00072 kg/cycle.

Discussion

6.	What is the scavenging efficiency for the perfect mixing if the delivery ratio is 1.5?(a) 80.73%(b) 81.73%(c) 82.73%(d) 84.73%I had been asked this question in an interview.I'm obligated to ask this question of 2 Stroke Engines in division Internal Combustion Engines of Automobile Engineering
Answer» Correct choice is (b) 81.73% To EXPLAIN I WOULD say: DELIVERY ratio = R = 1.7 and scavenging efficiency = ηsc. The relation between the R and ηsc is ηsc = 1 – e^-R= 1 – e^-1.7 = 1 – 0.1826 = 0.8173 = 81.73%. In perfect mixing, the incoming fresh charge mixes completely and instantaneously with the cylinder contents. A portion which is MIXED gets passed out at a rate EQUAL to that of charge entering the cylinder.

Discussion

7.	What is the excess air factor in the case of a two-stroke engine if the delivery ratio is 1.7?(a) 1.0(b) 0.8(c) 0.7(d) 0.9The question was posed to me in quiz.I would like to ask this question from 2 Stroke Engines in portion Internal Combustion Engines of Automobile Engineering
Answer» CORRECT answer is (c) 0.7 To explain: Delivery ratio = Rdel = 1.7, EXCESS sir factor = λ. The relation between the Rdel and λ is λ = Rdel – 1 = 1.7 – 1 = 0.7. The delivery ratio is the ratio of the air delivered to the reference volume or ratio of the mass of fresh air delivered to the reference mass. Rdel = Vdel / Vref or Rdel = Mdel / Mref.

Discussion

8.	How can a two-stroke engine identify by?(a) Piston size(b) Absence of valves(c) Cooling system(d) Lubrication systemThis question was addressed to me by my college professor while I was bunking the class.This is a very interesting question from 2 Stroke Engines topic in chapter Internal Combustion Engines of Automobile Engineering
Answer» RIGHT answer is (b) Absence of valves The BEST explanation: The two-stroke engine is identified by the absence of valves. Almost all two-stroke ENGINES do not have valves. This makes the two-stroke engine easy to produce and MAINTAIN.

Discussion

9.	Which of the following is the most perfect method of scavenging?(a) Reverse flow scavenging(b) Loop scavenging(c) Uniform scavenging(d) Cross scavengingThe question was posed to me during an interview for a job.This question is from 2 Stroke Engines topic in portion Internal Combustion Engines of Automobile Engineering
Answer» Correct OPTION is (c) Uniform scavenging The best I can explain: Uniform scavenging is the most perfect method of scavenging. In uniform scavenging, both fresh charge and BURNT GASES move in the same DIRECTION.

Discussion

10.	The flywheel stores the potential energy.(a) True(b) FalseI got this question in exam.I want to ask this question from Flywheel topic in section Internal Combustion Engines of Automobile Engineering
Answer» RIGHT answer is (b) False To explain: The FLYWHEEL stores the rotational energy. The amount of energy that flywheel can STORE is proportional to the square of the mass and its rotational velocity. The lighter FLYWHEELS are used in a sports car for easy and QUICK recovery of the RPM.

Discussion

11.	Which method of scavenging is used in two-wheelers without deflector type piston?(a) Cross scavenging(b) Reverse flow scavenging(c) Uniform scavenging(d) Loop scavengingI have been asked this question in homework.The above asked question is from 2 Stroke Engines topic in chapter Internal Combustion Engines of Automobile Engineering
Answer» Correct option is (a) CROSS scavenging The best explanation: Cross scavenging is used in two-wheelers without deflector type PISTON. In this, the fresh charge is DIRECTED upward, and then down to FORCE out the EXHAUST gases through the oppositely positioned exhaust port.

Discussion

12.	The valve is opened as the cam lobe on the cam raises the(a) Bearing(b) Piston(c) Valve lifter(d) Valve seatThis question was posed to me by my school teacher while I was bunking the class.This interesting question is from Engine Valves and their Mechanisms topic in section Internal Combustion Engines of Automobile Engineering
Answer» The correct ANSWER is (C) VALVE lifter The EXPLANATION: Valve opens when valve lifter is RAISED.

Discussion

13.	The material known as high carbon high copper chrome silicon cast steel is used for making _________(a) Camshaft(b) Cylinder body(c) Cylinder head(d) PistonThis question was posed to me by my school principal while I was bunking the class.This interesting question is from IC Engine Crankshaft and Camshaft in section Internal Combustion Engines of Automobile Engineering
Answer» CORRECT choice is (a) Camshaft The explanation: Material used for making camshafts is HIGH carbon high copper chrome silicon CAST STEEL.

Discussion

14.	The purpose of crankcase ventilation is to __________(a) Cool the oil(b) Remove vaporised water and fuel(c) Supply oxygen to the crankcase(d) It assists in maintaining the viscosity of oilThe question was posed to me in exam.My question is from Automobile Engineering topic in chapter Internal Combustion Engines of Automobile Engineering
Answer» The correct ANSWER is (b) REMOVE vaporised water and FUEL To explain: CRANKCASE ventilation REMOVES vaporised water and fuel.

Discussion

15.	In a diesel engine the fuel injection pressure is in the range(a) 100 to 170 atm(b) 60 to 70 atm(c) 30 to 40 atm(d) 20 to 25 atmThe question was asked during an online interview.My question is taken from Engine Valves and their Mechanisms in division Internal Combustion Engines of Automobile Engineering
Answer» Right ANSWER is (a) 100 to 170 atm To EXPLAIN I WOULD say: The pressure of FUEL injection is very high for a diesel engine.

Discussion

16.	Engines used in tractors are ______(a) Single cylinder engines(b) Two cylinder engines(c) Four cylinder engines(d) Six cylinder enginesI have been asked this question in exam.The question is from Applications of IC Engines topic in section Internal Combustion Engines of Automobile Engineering
Answer» Correct choice is (B) Two cylinder engines Best EXPLANATION: Two cylinder ENGINE is used in tractors.

Discussion

17.	What is the disadvantage of using diesel engine in comparison to petrol engine?(a) Higher weight-to-power ratio(b) Higher maintenance cost(c) Greater starting difficulties(d) All of the mentionedI got this question by my college professor while I was bunking the class.This key question is from Applications of IC Engines in section Internal Combustion Engines of Automobile Engineering
Answer» RIGHT option is (d) All of the mentioned To ELABORATE: All the given are the disadvantages of using a diesel ENGINE over PETROL engine.

Discussion

18.	In a 4-stroke ic engine, which of the strokes is considered as working or power stroke?(a) Suction stroke(b) Compression stroke(c) Expansion stroke(d) Exhaust strokeThe question was posed to me in a national level competition.Origin of the question is Development of IC Engines topic in division Internal Combustion Engines of Automobile Engineering
Answer» CORRECT answer is (c) EXPANSION stroke The best EXPLANATION: There are 4 strokes in a 4-stroke ic engine. These are Suction,compression,expansion and EXHAUST stroke. Out of these, the expansion stroke is called working or POWER stroke.

Discussion

19.	A gas undergoes step 4 in Carnot cycle. Which of these processes describes the 2nd step?(a) Isentropic expansion(b) Isentropic compression(c) Isothermal expansion(d) Isothermal compressionI got this question at a job interview.Query is from Heat Engines in section Internal Combustion Engines of Automobile Engineering
Answer» The correct choice is (B) ISENTROPIC COMPRESSION For explanation: The 4TH process in carnot CYCLE is isentropic compression.

Discussion

20.	Which of these is a type of reciprocating steam engine?(a) Simple(b) Compound(c) Uniflow(d) All of the mentionedThe question was asked in an interview for job.The question is from Heat Engines topic in portion Internal Combustion Engines of Automobile Engineering
Answer» Right CHOICE is (d) All of the mentioned The EXPLANATION: SIMPLE, compound and uniflow are types of reciprocating steam engine.

Discussion

21.	Exhaust valve temperature is about(a) 35 degree celsius(b) 100 degree celsius(c) 150 degree celsius(d) 500 degree celsiusThis question was addressed to me in an interview.Asked question is from Engine Valves and their Mechanisms in chapter Internal Combustion Engines of Automobile Engineering
Answer» CORRECT CHOICE is (d) 500 degree celsius Best explanation: The TEMPERATURE of the exhaust valve is of the ORDER of 500 degree celsius.

Discussion

22.	A single cylinder four stroke engine is rotating at 2000 rpm. The number of power strokes occuring in one minute is ________(a) 500(b) 1000(c) 2000(d) 4000The question was asked in an online quiz.The question is from Energy Cycle in division Internal Combustion Engines of Automobile Engineering
Answer» Correct OPTION is (B) 1000 The best explanation: For EVERY two revolutions one cylse is completed in a four stroke ENGINE. If speed is 2000 RPM then number of complete cycles per minute is 1000.

Discussion

23.	The stroke of an engine is the _________(a) Volume of the cylinder(b) Length of the connecting rod(c) Internal diameter of the cylinder(d) Distance between TDC and BDCThis question was addressed to me in an interview for job.My enquiry is from Parts of an IC Engine Cylinder and Liner topic in portion Internal Combustion Engines of Automobile Engineering
Answer» Right answer is (d) Distance between TDC and BDC Best explanation: Distance between TDC and BDc is TERMED as the STROKE of an ENGINE.

Discussion

24.	The thickness of wet liners ranges from _______(a) 1.5 mm to 6 mm(b) 1 mm to 2 mm(c) 6 mm to 10 mm(d) 0.5 mm to 2.5 mmI got this question in a national level competition.My question is taken from Parts of an IC Engine Cylinder and Liner topic in portion Internal Combustion Engines of Automobile Engineering
Answer» The CORRECT OPTION is (a) 1.5 mm to 6 mm Best EXPLANATION: The thickness of WET liners is of about 1.5 mm to 6 mm.

Discussion

25.	Which of these is not an assumption made in deriving the formula for air standard of Otto cycle?(a) There is no heat loss during the cycle(b) The compression and expansion are isothermal(c) The heating and cooling strictly take place at constant volume(d) The suction and exhaust take place at atmospheric pressureI have been asked this question at a job interview.This key question is from Development of IC Engines in portion Internal Combustion Engines of Automobile Engineering
Answer» Right CHOICE is (b) The COMPRESSION and expansion are isothermal Explanation: Compression and expansion are assumed STRICTLY adiabatic in a OTTO CYCLE.

Discussion

26.	What type of material is used for Gudgeon pin?(a) Cast iron(b) Aluminium(c) Steel alloy of high strength(d) Hardened and ground steelThis question was posed to me in an interview for job.I'd like to ask this question from Automobile Engineering in section Internal Combustion Engines of Automobile Engineering
Answer» Right choice is (C) Steel alloy of HIGH strength For explanation I would say: GUDGEON pins are made of steel alloy of high strength. Gudgeon pins are short hollow pipes. Steel alloy of high strength are used for this PIN because it should be very light and also have very high strength and temperature RESISTANCE.

Discussion

27.	The plate which acts as a packing between cylinder block and cylinder head is called ________(a) Chaplet(b) Liner(c) Gasket(d) FlangeI have been asked this question in an online interview.This intriguing question comes from Automobile in chapter Internal Combustion Engines of Automobile Engineering
Answer» Correct option is (c) GASKET The best explanation: Gasket FORMS the PACKING between CYLINDER block and cylinder HEAD.

Discussion

28.	The steam engine has a flywheel which is having a radius of gyration of 1.1 m and mass of 2200 kg. The starting torque is 1550 Nm and assumed constant. What is the angular acceleration of the flywheel?(a) 0.54 rad/s^2(b) 0.58 rad/s^2(c) 0.62 rad/s^2(d) 0.52 rad/s^2The question was asked in class test.Question is taken from Flywheel topic in division Internal Combustion Engines of Automobile Engineering
Answer» The correct choice is (B) 0.58 rad/s^2 Easiest explanation: I = mass moment of inertia of the FLYWHEEL, m = mass of the flywheel, k = radius of gyration, T = STATING TORQUE, and α = ANGULAR acceleration of the flywheel. I = mk^2 = 22001.1^2 = 2662 kg-m^2. T = Iα ⇒ 1550 = 2662 α ⇒ α = 0.58 rad/s^2.

Discussion

29.	A four cylinder engine is of capacity 2.4 litres. Then swept volume of one cylinder is ______(a) 400 cubic centimeters(b) 600 cubic centimeters(c) 2400 cubic centimeters(d) 1200 cubic centimetersThe question was asked in quiz.I would like to ask this question from Parts of an IC Engine Cylinder and Liner in chapter Internal Combustion Engines of Automobile Engineering
Answer» The CORRECT ANSWER is (b) 600 cubic centimeters To EXPLAIN: Volume of ONE cylinder will be 2.4/4 = 0.6 litres or 600 cubic centimeters.

Discussion

30.	In S.I engine the intake valve closes __________(a) At BDC(b) At TDC(c) 25 degree to 84 degree after BDC(d) 10 degree to 20 degree before TDCThe question was asked by my college professor while I was bunking the class.I want to ask this question from Energy Cycle in chapter Internal Combustion Engines of Automobile Engineering
Answer» Right choice is (C) 25 degree to 84 degree after BDC The explanation is: The intake VALVE CLOSES at 25 degree to 84 degree after BDC.

Discussion

31.	Piston compression rings are made of _____________(a) Cast iron(b) Steel(c) Aluminium(d) BronzeThe question was posed to me by my school principal while I was bunking the class.Question is from Automobile Engineering in chapter Internal Combustion Engines of Automobile Engineering
Answer» Correct answer is (a) CAST iron The best EXPLANATION: Cast iron is used for piston compression RINGS.

Discussion

32.	Which of the following item is made of aluminium alloy?(a) Piston ring(b) Piston(c) Connecting rod(d) CrankshaftThis question was posed to me by my school principal while I was bunking the class.Origin of the question is Automobile topic in portion Internal Combustion Engines of Automobile Engineering
Answer» Correct option is (b) Piston Easiest explanation: Aluminium alloy is USED in making piston. Aluminium alloys are used for the piston because it PROVIDES high resistance to the temperature. Since, the piston FACES the HIGHEST temperature it must have the highest temperature resistance.

Discussion

33.	The entrance of the piston pin hole is sealed by ____________(a) Steel plating(b) Snap ring(c) Rubber ring(d) None of the mentionedThis question was addressed to me in an interview for job.Question is from Automobile in portion Internal Combustion Engines of Automobile Engineering
Answer» RIGHT option is (b) Snap ring The BEST EXPLANATION: Snap rings are used to seal the ENTRANCE.

Discussion

34.	In a diesel engine the temperature of gases under full load may be of the order of __________(a) 550-650 degree Celsius(b) 200-300 degree Celsius(c) 150-200 degree Celsius(d) 100 degree CelsiusI have been asked this question in an interview.The query is from Energy Cycle topic in chapter Internal Combustion Engines of Automobile Engineering
Answer» RIGHT option is (a) 550-650 degree Celsius Explanation: Temperature under full load MAY be as high as 550 to 650 degree Celsius.

Discussion

35.	What is the function of an oil scraper ring in an engine?(a) Retain compression(b) Lubricate cylinder walls(c) Maintain vacuum(d) Reduce piston wearThe question was asked in a job interview.My question comes from Parts of an IC Engine Cylinder and Liner in division Internal Combustion Engines of Automobile Engineering
Answer» The CORRECT choice is (b) Lubricate cylinder walls To explain I WOULD say: Oil scraper RINGS lubricate cylinder walls. Lubricating oils are most IMPORTANT for an engine because it reduces the friction between walls and other parts and it also works as a cooling agent.

Discussion

36.	Which of these is a cylinder head type of an ic engine?(a) X head(b) U head(c) F head(d) C headThe question was posed to me in an interview for internship.This interesting question is from Applications of IC Engines topic in division Internal Combustion Engines of Automobile Engineering
Answer» The correct option is (c) F head Easy EXPLANATION: F type head is a type of an ic ENGINE CYLINDER head. It can be described as a COMBINATION of I-type and L-type head. F-type cylinder heads have an INTAKE manifold and its valves on top of the cylinder.

Discussion

37.	Ignition advance is expressed in terms of _________(a) Crank angle(b) Millimetres of piston travel before TDC(c) Time in milli seconds(d) All of the mentionedI had been asked this question at a job interview.This key question is from Energy Cycle topic in section Internal Combustion Engines of Automobile Engineering
Answer» Right ANSWER is (d) All of the mentioned Best EXPLANATION: IGNITION ADVANCE can be expressed in terms of any of the following.

Discussion

38.	In case of four cylinder opposed cylinder engines the firing order is ___________(a) 1-4-3-2(b) 1-3-4-2(c) 1-2-3-4(d) 1-2-4-3This question was posed to me in homework.My question comes from Energy Cycle in chapter Internal Combustion Engines of Automobile Engineering
Answer» The CORRECT option is (a) 1-4-3-2 To ELABORATE: The firing ORDER in these ENGINES is 1-4-3-2.

Discussion

39.	In Wankel engines, how many power strokes occur per rotor revolution?(a) 1(b) 2(c) 3(d) 4The question was posed to me by my school principal while I was bunking the class.This key question is from Applications of IC Engines in division Internal Combustion Engines of Automobile Engineering
Answer» RIGHT option is (c) 3 To explain: Wankel is a type of IC engine which has an eccentric rotor design.For one rotor revolution, there are THREE POWER strokes in a Wankel engine. This engine CONVERTS pressure into rotating MOTION.

Discussion

40.	In a four stroke ic engine, how many strokes are covered for one complete crankshaft revolution?(a) 4(b) 2(c) 1(d) 0.5The question was posed to me in unit test.The origin of the question is Development of IC Engines in portion Internal Combustion Engines of Automobile Engineering
Answer» The CORRECT answer is (b) 2 For explanation: For a 4 stroke engine, piston covers 2 STROKES for one complete CRANKSHAFT REVOLUTION. It TAKES two rotations of the crankshaft and 4 strokes of piston to complete one cycle.

Discussion

41.	In a Diesel cycle engine, combustion occurs at _________(a) Constant pressure(b) Constant temperature(c) Constant volume(d) Constant heatThe question was posed to me in final exam.Enquiry is from Development of IC Engines in portion Internal Combustion Engines of Automobile Engineering
Answer» RIGHT choice is (a) Constant pressure Best EXPLANATION: Combustion in a Diesel CYCLE engine OCCURS at constant pressure.

Discussion

42.	In a Otto cycle engine, combustion occurs at __________(a) Constant pressure(b) Constant temperature(c) Constant volume(d) Constant heatThe question was asked during a job interview.My doubt is from Development of IC Engines topic in section Internal Combustion Engines of Automobile Engineering
Answer» Correct answer is (c) Constant volume The BEST I can explain: Combustion process in an Otto cycle engine occurs at constant volume. Otto cycle has TWO isentropic processes and two constant volume processes. This cycle is MOSTLY used for petrol engines.

Discussion

43.	A gas undergoes step 2 in Carnot cycle. Which of these processes describes the 2nd step?(a) Isentropic expansion(b) Isentropic compression(c) Isothermal expansion(d) Isothermal compressionI got this question in a national level competition.I'd like to ask this question from Heat Engines topic in portion Internal Combustion Engines of Automobile Engineering
Answer» The correct choice is (a) Isentropic EXPANSION To explain: The 2nd PROCESS in CARNOT cycle is isentropic expansion.

Discussion

44.	What is the coefficient of fluctuation of speed?(a) The ratio of the maximum fluctuation of speed to the mean speed(b) The ratio of the maximum fluctuation of energy to the mean speed(c) The ratio of the minimum fluctuation of energy to the mean speed(d) The ratio of the work done per cycle to the mean speedThis question was addressed to me by my college director while I was bunking the class.The doubt is from Flywheel topic in chapter Internal Combustion Engines of Automobile Engineering
Answer» Correct CHOICE is (a) The ratio of the maximum FLUCTUATION of SPEED to the mean speed The best explanation: The COEFFICIENT of fluctuation of speed is the ratio of the maximum fluctuation of speed to the mean speed. CS = (ω1 – ω2)/ω =2 (ω1 – ω2) / (ω1+ω2) or Cs = 2(N1-N2) / (N1+N2).

Discussion

45.	When no.1 piston of a four cylinder in line four stroke engine is performing the power stroke, no.4 piston is on the stroke called _______(a) Suction(b) Compression(c) Power(d) ExhaustI had been asked this question in an interview for internship.Enquiry is from Automobile Engineering in portion Internal Combustion Engines of Automobile Engineering
Answer» CORRECT OPTION is (a) SUCTION The explanation is: When no.1 piston is on power STROKE, no.4 piston will be on suction stroke.

Discussion

46.	Engine pistons are generally made of aluminium alloy because ______(a) It is lighter(b) It is stronger(c) It has less wear(d) It absorbs shockThis question was addressed to me in an international level competition.My enquiry is from Automobile Engineering in portion Internal Combustion Engines of Automobile Engineering
Answer» RIGHT choice is (a) It is LIGHTER Easiest explanation: Aluminium ALLOY are USED because they are lighter.

Discussion

47.	A 150 c.c. two-stroke petrol engine running at 5000 rpm can develop a maximum brake power of _________(a) 15 kW(b) 10 kW(c) 5 kW(d) 1 kWI have been asked this question in a national level competition.The doubt is from Applications of IC Engines in section Internal Combustion Engines of Automobile Engineering
Answer» The CORRECT choice is (C) 5 kW Best EXPLANATION: These type of engines can develop a maximum brake POWER of 5 kW.

Discussion

48.	In internal combustion engine the approximate percentage of the combustion heat that passes to the cylinder walls is _________(a) 5%(b) 10%(c) 30%(d) 60%I got this question during an interview.My question is based upon Energy Cycle in chapter Internal Combustion Engines of Automobile Engineering
Answer» The correct ANSWER is (c) 30% For EXPLANATION: APPROXIMATELY 30% of heat PASSES to the cylinder walls.

Discussion

49.	Thermal power plants operate on which of these cycles?(a) Otto cycle(b) Rankine cycle(c) Carnot cycle(d) Stirling cycleThis question was posed to me by my school principal while I was bunking the class.Question is taken from Heat Engines topic in division Internal Combustion Engines of Automobile Engineering
Answer» Correct OPTION is (b) RANKINE CYCLE The explanation is: Thermal POWER plants operate on Rankine cycle.

Discussion

50.	The engine has the flywheel of mass 7 tons and the radius of gyration is 1.7 m. The fluctuation of energy is 55 kN-m. The mean speed of the engine is 150 rpm. What is the coefficient of fluctuation of speed?(a) 0.021(b) 0.011(c) 0.031(d) 0.041I got this question in an interview.Enquiry is from Flywheel in division Internal Combustion Engines of Automobile Engineering
Answer» RIGHT choice is (b) 0.011 Explanation: The FLUCTUATION of energy = ΔE, the mass of the flywheel = m, the RADIUS of GYRATION = k, the mean speed of the flywheel = N.ΔE = \(\frac{π^2}{900}\)mk^2N(N1-N2) = \(\frac{π^2}{900}\)70001.7^2150(N1-N2) = 33277(N1-N2) ⇒ 55000 = 33277(N1-N2) ⇒ (N1-N2)=\(\frac{55000}{33277}\) = 1.652 RPM. Coefficient of fluctuation of speed = Cs = \(\frac{N_1-N_2}{N}\) = \(\frac{1.652}{150}\) = 0.011.

Discussion

Explore topic-wise InterviewSolutions in .

The two-stroke engine is easy to manufacture.(a) True(b) FalseThis question was posed to me by my school principal while I was bunking the class.This key question is from 2 Stroke Engines in chapter Internal Combustion Engines of Automobile Engineering

Which of the following is not an advantage of a two-stroke engine?(a) Not valves(b) Lighter flywheel(c) More uniform torque(d) No lubrication systemThe question was asked in a job interview.Enquiry is from 2 Stroke Engines topic in portion Internal Combustion Engines of Automobile Engineering

What is the scavenging efficiency for the perfect mixing if the delivery ratio is 1.5?(a) 80.73%(b) 81.73%(c) 82.73%(d) 84.73%I had been asked this question in an interview.I'm obligated to ask this question of 2 Stroke Engines in division Internal Combustion Engines of Automobile Engineering

What is the excess air factor in the case of a two-stroke engine if the delivery ratio is 1.7?(a) 1.0(b) 0.8(c) 0.7(d) 0.9The question was posed to me in quiz.I would like to ask this question from 2 Stroke Engines in portion Internal Combustion Engines of Automobile Engineering

The flywheel stores the potential energy.(a) True(b) FalseI got this question in exam.I want to ask this question from Flywheel topic in section Internal Combustion Engines of Automobile Engineering

Engines used in tractors are ______(a) Single cylinder engines(b) Two cylinder engines(c) Four cylinder engines(d) Six cylinder enginesI have been asked this question in exam.The question is from Applications of IC Engines topic in section Internal Combustion Engines of Automobile Engineering

Which of these is a type of reciprocating steam engine?(a) Simple(b) Compound(c) Uniflow(d) All of the mentionedThe question was asked in an interview for job.The question is from Heat Engines topic in portion Internal Combustion Engines of Automobile Engineering

Exhaust valve temperature is about(a) 35 degree celsius(b) 100 degree celsius(c) 150 degree celsius(d) 500 degree celsiusThis question was addressed to me in an interview.Asked question is from Engine Valves and their Mechanisms in chapter Internal Combustion Engines of Automobile Engineering

A single cylinder four stroke engine is rotating at 2000 rpm. The number of power strokes occuring in one minute is ________(a) 500(b) 1000(c) 2000(d) 4000The question was asked in an online quiz.The question is from Energy Cycle in division Internal Combustion Engines of Automobile Engineering

The plate which acts as a packing between cylinder block and cylinder head is called ________(a) Chaplet(b) Liner(c) Gasket(d) FlangeI have been asked this question in an online interview.This intriguing question comes from Automobile in chapter Internal Combustion Engines of Automobile Engineering

Piston compression rings are made of _____________(a) Cast iron(b) Steel(c) Aluminium(d) BronzeThe question was posed to me by my school principal while I was bunking the class.Question is from Automobile Engineering in chapter Internal Combustion Engines of Automobile Engineering

The entrance of the piston pin hole is sealed by ____________(a) Steel plating(b) Snap ring(c) Rubber ring(d) None of the mentionedThis question was addressed to me in an interview for job.Question is from Automobile in portion Internal Combustion Engines of Automobile Engineering

Which of these is a cylinder head type of an ic engine?(a) X head(b) U head(c) F head(d) C headThe question was posed to me in an interview for internship.This interesting question is from Applications of IC Engines topic in division Internal Combustion Engines of Automobile Engineering

In case of four cylinder opposed cylinder engines the firing order is ___________(a) 1-4-3-2(b) 1-3-4-2(c) 1-2-3-4(d) 1-2-4-3This question was posed to me in homework.My question comes from Energy Cycle in chapter Internal Combustion Engines of Automobile Engineering

In Wankel engines, how many power strokes occur per rotor revolution?(a) 1(b) 2(c) 3(d) 4The question was posed to me by my school principal while I was bunking the class.This key question is from Applications of IC Engines in division Internal Combustion Engines of Automobile Engineering

In a four stroke ic engine, how many strokes are covered for one complete crankshaft revolution?(a) 4(b) 2(c) 1(d) 0.5The question was posed to me in unit test.The origin of the question is Development of IC Engines in portion Internal Combustion Engines of Automobile Engineering

In a Diesel cycle engine, combustion occurs at _________(a) Constant pressure(b) Constant temperature(c) Constant volume(d) Constant heatThe question was posed to me in final exam.Enquiry is from Development of IC Engines in portion Internal Combustion Engines of Automobile Engineering

In a Otto cycle engine, combustion occurs at __________(a) Constant pressure(b) Constant temperature(c) Constant volume(d) Constant heatThe question was asked during a job interview.My doubt is from Development of IC Engines topic in section Internal Combustion Engines of Automobile Engineering

In internal combustion engine the approximate percentage of the combustion heat that passes to the cylinder walls is _________(a) 5%(b) 10%(c) 30%(d) 60%I got this question during an interview.My question is based upon Energy Cycle in chapter Internal Combustion Engines of Automobile Engineering