IC Engines MCQ
IC Engines MCQ includes key topics like SI and CI engines, combustion, fuel systems, thermodynamic cycles, performance parameters, and emissions. These objective questions help students strengthen engine fundamentals for mechanical engineering and competitive exams.
Q31. Main function of piston rings is?
A. Store oil
B. Prevent gas leakage
C. Generate spark
D. Control speed
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Q32. Flash point of fuel is?
A. Auto-ignition temp
B. Lowest temperature at which vapour ignites
C. Burning temperature
D. Cooling temperature
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Q33. Specific fuel consumption (SFC) is?
A. Fuel/Power
B. Air/Fuel
C. Power/Time
D. Fuel/Volume
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Q34. The calorific value of diesel is approx?
A. 2000 kcal/kg
B. 5000 kcal/kg
C. 11000 kcal/kg
D. 20000 kcal/kg
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Q35. Which turbocharger uses exhaust gases?
A. Electric turbo
B. Mechanical blower
C. Exhaust turbocharger
D. Cooling fan
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Q36. Spark timing in petrol engine is controlled by?
A. Injector
B. Crankshaft
C. Ignition system
D. Fuel tank
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Q37. Diesel engines operate on?
A. Constant pressure heat addition
B. Constant volume heat addition
C. Both
D. Neither
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Q38. Stoichiometric mixture means?
A. Rich mixture
B. Lean mixture
C. Chemically correct mixture
D. Dry mixture
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Q39. Which engine has higher thermal efficiency?
A. Petrol engine
B. Diesel engine
C. Gas engine
D. Steam engine
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Q40. Throttle valve is used in?
A. Diesel engine
B. Petrol engine
C. Steam engine
D. Gas turbine
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Q41. What is the purpose of camshaft?
A. Control coolant
B. Open/close valves
C. Store fuel
D. Ignite fuel
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Q42. Governor mainly controls?
A. Speed
B. Temperature
C. Lubrication
D. Fuel grade
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Q43. Exhaust gas recirculation (EGR) reduces?
A. CO2
B. NOx
C. Smoke
D. CO
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Q44. The pollution from incomplete combustion is?
A. CO
B. CO2
C. O2
D. H2O
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Q45. Turbo lag occurs due to?
A. High speed
B. Delay in turbo boost
C. Low AFR
D. Rich mixture
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Q46. Air standard efficiency of otto cycle increases with?
A. Decreasing CR
B. Increasing CR
C. Increasing temperature
D. Lean mixture
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Q47. Which sensor detects crankshaft position?
A. MAP sensor
B. TPS
C. CKP sensor
D. O2 sensor
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Q48. BSFC stands for?
A. Brake specific fuel consumption
B. Basic specific fuel calculation
C. Brake system fuel control
D. Bearing specific fuel constant
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