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. During idling, a petrol engine requires _ mixture.
(A) Lean
(B) Rich
(C) Chemically correct
(D) None of these
Answer: (B) Rich
Q2. All heat engines utilize
(A) Low heat value of oil
(B) High heat value of oil
(C) Net calorific value of oil
(D) Calorific value of fuel
Answer: (A) Low heat value of oil
Q3. The volumetric efficiency of a well designed engine may be
(A) 30 to 40%
(B) 40 to 60%
(C) 60 to 70%
(D) 75 to 90%
Answer: (D) 75 to 90%
Q4. An hmh flame speed is obtained in diesel engine when air fuel ratio is
(A) Uniform throughout the mixture
(B) Chemically correct mixture
(C) About 35% of rich mixture
(D) About 10% of rich mixture
Answer: (D) About 10% of rich mixture
Q5. The sensing element in the control system of nuclear reactors measures the _ of the neutron flux in the reactor.
(A) Temperature
(B) Volume
(C) Density
(D) None of these
Answer: (C) Density
Q6. Supercharging is essential in
(A) Diesel engines
(B) Gas turbines
(C) Petrol engines
(D) Aircraft engines
Answer:(D) Aircraft engines
Q7. In a petrol engine, if diesel is used, then the engine will
(A) Not run
(B) Run more efficiently
(C) Run at high speed
(D) Explode
Answer: (A) Not run
Q8. In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the
(A) Beginning of suction stroke
(B) End of suction stroke
(C) Beginning of exhaust stroke
(D) End of exhaust stroke
Answer: (A) Beginning of suction stroke
Q9. The thermodynamic cycle on which the petrol engine works, is
(A) Otto cycle
(B) Joule cycle
(C) Rankine cycle
(D) Stirling cycle
Answer: (A) Otto cycle
Q10. Alpha-methyl-naphthalene (C₁₁ H₁₀) has a cetane number of
(A) 0
(B) 50
(C) 100
(D) 120
Answer: (A) 0
Q11. The knocking in diesel engines may be prevented by
(A) Reducing the delay period
(B) Raising the compression ratio
(C) Increasing the inlet pressure of air
(D) All of these
Answer: (D) All of these
Q12. The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)
(A) 1 – rγ – 1
(B) 1 + rγ – 1
(C) 1 – (1/rγ – 1)
(D) None of these
Answer: (C) 1 – (1/rγ – 1)
Q13. The mean effective pressure obtained from engine indicator indicates the
(A) Maximum pressure developed
(B) Minimum pressure
(C) Instantaneous pressure at any instant
(D) Average pressure
Answer: (D) Average pressure
Q14. It the temperature of intake air in IC engines is lowered, then its efficiency will
(A) Increase
(B) Decrease
(C) Remain same
(D) Increase up to certain limit and then decrease
Answer: (A) Increase
Q15. A supercharged engine as compared to an ordinary engine
(A) Requires smaller foundation
(B) Is lighter
(C) Consumes less lubricating oil
(D) All of these
Answer: (D) All of these
Q16. Volatility of diesel fuel oil is
(A) Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
(B) Temperature at which it solidifies or congeals
(C) It catches fire without external aid
(D) Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
Answer: (D) Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
Q17. In a petrol engine, the fuel supplied to the engine cylinder is mixed with required quantity of air and the mixture is ignited with a
(A) Fuel pump
(B) Fuel injector
(C) Spark plug
(D) None of these
Answer: (C) Spark plug
Q18. The air-fuel ratio in petrol engines is controlled by
(A) Controlling valve opening/closing
(B) Governing
(C) Injection
(D) Carburetion
Answer: (D) Carburetion
Q19. Which of the following statement is wrong?
(A) A four stroke cycle engine develops twice the power as that of a two stroke cycle engine
(B) For the same power developed, a four stroke cycle engine is lighter, less bulky and occupies less floor area
(C) The petrol engines are costly than diesel engines
(D) All of the above
Answer: (D) All of the above
Q20. A 5 BHP engine running at full load would consume diesel of the order of
(A) 0.3 kg/hr
(B) 1 kg/hr
(C) 3 kg/hr
(D) 5 kg/hr
Answer:(B) 1 kg/hr
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