Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineering new exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Mechanical Engineering. Each question has four options followed by the right answer. These Mechanical Engineering MCQ Questions are selected supported by the newest exam pattern.
Q1. A mixture containing 65% of iso-octane and 35% of normal heptane will have
(A) Cetane number 65
(B) Octane number 65
(C) Cetane number 35
(D) Octane number 35
Answer: (B) Octane number 65
Q2. The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is
(A) Same
(B) More
(C) Less
(D) Less or more depending on operating conditions
Answer: (B) More
Q3. The knocking tendency in spark ignition engines may be decreased by
(A) Controlling the air-fuel mixture
(B) Controlling the ignition timing
(C) Controlling the exhaust temperature
(D) Reducing the compression ratio
Answer: (D) Reducing the compression ratio
Q4. Morse test can be conducted for
(A) Petrol engines
(B) Diesel engines
(C) Multi cylinder engines
(D) All of these
Answer: (C) Multi cylinder engines
Q5. In petrol engines, the delay period is of the order of
(A) 0.001 second
(B) 0.002 second
(C) 0.003 second
(D) 0.004 second
Answer: (B) 0.002 second
Q6. A diesel engine, during suction stroke, draws
(A) Air only
(B) Diesel only
(C) A mixture of diesel and air
(D) None of these
Answer: (A) Air only
Q7. The injection pressure in a diesel engine is about
(A) 10 bar
(B) 100 bar
(C) 150 bar
(D) 500 bar
Answer: (B) 100 bar
Q8. Which one of the following engines will have heavier flywheel than the remaining ones?
(A) 30 kW four-stroke petrol engine running at 1500 r.p.m.
(B) 30 kW two-stroke petrol engine running at 1500 r.p.m.
(C) 30 kW two-stroke diesel engine running at 750 r.p.m.
(D) 30 kW four-stroke diesel engine running at 750 r.p.m.
Answer: (A) 30 kW four-stroke petrol engine running at 1500 r.p.m.
Q9. An engine indicator is used to determine the following
(A) Speed
(B) Temperature
(C) Volume of cylinder
(D) m.e.p. and I.H.P.
Answer: (D) m.e.p. and I.H.P.
Q10. The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called
(A) Net efficiency
(B) Efficiency ratio
(C) Relative efficiency
(D) Overall efficiency
Answer: (C) Relative efficiency
Q11. Thermal efficiency of a two stroke cycle engine is _ a four stroke cycle engine.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these
Answer: (B) Less than
Q12. In loop scavenging, the top of the piston is
(A) Flat
(B) Contoured
(C) Slanted
(D) Depressed
Answer: (B) Contoured
Q13. The reference fuels for knock rating of spark ignition engines would include
(A) Iso-octane and alpha-methyl naphthalene
(B) Normal octane and aniline
(C) Iso-octane and normal hexane
(D) Normal heptane and iso-octane
Answer: (D) Normal heptane and iso-octane
Q14. In diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of
(A) 250°C
(B) 500°C
(C) 1000°C
(D) 2000°C
Answer: (C) 1000°C
Q15. A two stroke cycle engine gives __ the number of power strokes as compared to the four stroke cycle engine, at the same engine speed.
(A) Half
(B) Same
(C) Double
(D) Four times
Answer: (C) Double
Q16. Fuel oil consumption guarantees for I .C. engine are usually based on
(A) Low heat value of oil
(B) High heat value of oil
(C) Net calorific value of oil
(D) Calorific value of fuel
Answer: (B) High heat value of oil
Q17. The increase of efficiency of a compression ignition engine, as the load decreases, is due to
(A) Higher maximum temperature
(B) Qualitative governing
(C) Quantitative governing
(D) Hit and miss governing
Answer: (B) Qualitative governing
Q18. The term scavenging is generally associated with
(A) 2-stroke cycle engines
(B) 4-stroke cycle engines
(C) Aeroplane engines
(D) High efficiency engines
Answer: (D) High efficiency engines
Q19. High speed compression engines operate on
(A) Otto cycle
(B) Diesel cycle
(C) Dual combustion cycle
(D) All of these
Answer: (C) Dual combustion cycle
Q20. Which of the following is the lightest and most volatile liquid fuel?
(A) Diesel
(B) Kerosene
(C) Fuel oil
(D) Gasoline
Answer: (D) Gasoline
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