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 supercharged engine as compared to an ordinary engine
(A) Is lighter
(B) Requires smaller foundations
(C) Consumes less lubricating oil
(D) All of these
Answer:(D) All of these
Q2. Pick up the wrong statement
(A) 2-stroke engine can run in any direction
(B) In 4-stroke engine, a power stroke is obtained in 4-strokes
(C) Thermal efficiency of 4-stroke engine is more due to positive scavenging
(D) Petrol engines occupy more space than diesel engines for same power output
Answer: (D) Petrol engines occupy more space than diesel engines for same power output
Q3. Which of the following fuel has little tendency towards detonation?
(A) Benzene
(B) Iso-octane
(C) Normal heptane
(D) Alcohol
Answer: (B) Iso-octane
Q4. Installation of supercharger on a four cycle diesel engine can result in the following percentage increase in power
(A) Up to 35%
(B) Up to 50%
(C) Up to 75%
(D) Up to 100%
Answer: (D) Up to 100%
Q5. The exhaust valve in a four stroke cycle petrol engine
(A) Opens at 50° before bottom dead center and closes at 15° after top dead center
(B) Opens at bottom dead center and closes at top dead center
(C) Opens at 50° after bottom dead center and closes at 15° before top dead center
(D) May open and close anywhere
Answer: (A) Opens at 50° before bottom dead center and closes at 15° after top dead center
Q6. The correct mixture strength (by weight) for petrol is about
(A) 14.6 : 1
(B) 18.5 : 1
(C) 20.4 : 1
(D) 22.6 : 1
Answer: (A) 14.6 : 1
Q7. The increase in intake temperature of internal combustion engines will _ efficiency.
(A) Have no effect on
(B) Increase
(C) Decrease
(D) None of these
Answer: (C) Decrease
Q8. The air-fuel ratio of the petrol engine is controlled by
(A) Carburettor
(B) Injector
(C) Governor
(D) None of these
Answer: (A) Carburettor
Q9. Pick up the wrong statement about supercharging
(A) Supercharging reduces knocking in diesel engines
(B) There can be limited supercharging in petrol engines because of detonation
(C) Supercharging at high altitudes is essential
(D) Supercharging results in fuel economy
Answer: (D) Supercharging results in fuel economy
Q10. The probability of knocking in diesel engines is increased by
(A) High self ignition temperature
(B) Low volatility
(C) Higher viscosity
(D) All of these
Answer: (D) All of these
Q11. The loud pulsating noise heard within the cylinder of an internal combustion engine is known as
(A) Detonation
(B) Turbulence
(C) Pre-ignition
(D) Supercharging
Answer: (A) Detonation
Q12. Which of the following is not an intern’s combustion engine?
(A) 2-stroke petrol engine
(B) 4-stroke petrol engine
(C) Diesel engine
(D) Steam turbine
Answer: (D) Steam turbine
Q13. The purpose of testing an internal combustion engine is
(A) To determine the information, which cannot be obtained by calculations
(B) To conform the data used in design, the validity of which may be doubtful
(C) To satisfy the customer regarding the performance of the engine
(D) All of the above
Answer: (D) All of the above
Q14. For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of
(A) 9 : 1
(B) 12 : 1
(C) 15 : 1
(D) 18 : 1
Answer:(B) 12 : 1
Q15. The function of a distributor in a coil ignition system of I.C. engines is
(A) To distribute spark
(B) To distribute power
(C) To distribute current
(D) To time the spark
Answer: (D) To time the spark
Q16. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?
(A) Yes
(B) No
(C) To some extent
(D) Unpredictable
Answer:(B) No
Q17. A petrol engine, during suction stroke draws
(A) Air only
(B) Petrol only
(C) A mixture of petrol and air
(D) None of these
Answer: (C) A mixture of petrol and air
Q18. The inlet value of a four stroke cycle I.C engine remains open for nearly
(A) 180°
(B) 125°
(C) 235°
(D) 200°
Answer: (C) 235°
Q19. If V₁ is the jet velocity and V₀ is the vehicle velocity, then propulsive efficiency of a turbojet engine is
(A) V₁ / (V₀ + V₁)
(B) V₀ / (V₀ + V₁)
(C) 2V₀ / (V₀ + V₁)
(D) 2V₁ / (V₀ + V₁)
Answer:(C) 2V₀ / (V₀ + V₁)
Q20. Most high speed compression engines operate on
(A) Diesel cycle
(B) Otto cycle
(C) Dual combustion cycle
(D) Special type of air cycle
Answer: (C) Dual combustion cycle
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