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. The delay period in compression ignition engines depends upon
(A) Temperature and pressure in the cylinder at the time of injection
(B) Nature of the fuel mixture strength
(C) Relative velocity between the fuel injection and air turbulence pressure of residual gases
(D) All of the above
Answer:(D) All of the above
Q2. The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will
(A) Increase
(B) Decrease
(C) Be independent
(D) May increase or decrease depending on other factors
Answer: (B) Decrease
Q3. A diesel engine is _ as compared to petrol engine, both running at rated load.
(A) Equally efficient
(B) Less efficient
(C) More efficient
(D) None of these
Answer: (C) More efficient
Q4. Antiknock for compression ignition engines is
(A) Napthene
(B) Tetra ethyl lead
(C) Amyl nitrate
(D) Hexadecane
Answer: (C) Amyl nitrate
Q5. Morse test is used to determine the I.P. of a
(A) Single cylinder petrol engine
(B) Four stroke engine
(C) Single cylinder diesel engine
(D) Multi cylinder engine
Answer: (D) Multi cylinder engine
Q6. In a four stroke cycle diesel engine, the exhaust valve
(A) Opens at 30° before bottom dead centre and closes at 10° after top dead centre
(B) Opens at 30° after bottom dead centre and closes at 10° before top dead centre
(C) Opens at bottom dead centre and closes at top dead centre
(D) May open and close anywhere
Answer: (A) Opens at 30° before bottom dead centre and closes at 10° after top dead centre
Q7. The inlet valve of a four stroke cycle internal combustion engine remains open for
(A) 130°
(B) 180°
(C) 230°
(D) 270°
Answer: (C) 230°
Q8. Scavenging is usually done to increase
(A) Thermal efficiency
(B) Speed
(C) Power output
(D) Fuel consumption
Answer: (C) Power output
Q9. The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is
(A) Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
(B) Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
(C) Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
(D) Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine
Answer: (A) Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
Q10. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft
(A) 1/2
(B) 1
(C) 2
(D) 4
Answer: (C) 2
Q11. A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is
(A) 248 cm3
(B) 252 cm3
(C) 264 cm3
(D) 286 cm3
Answer: (C) 264 cm3
Q12. The accumulation of carbon in a cylinder results in increase of
(A) Clearance volume
(B) Volumetric efficiency
(C) Ignition time
(D) Effective compression ratio
Answer: (D) Effective compression ratio
Q13. The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
(A) Jet area is automatically varied depending on the suction
(B) The flow from the main jet is diverted to the compensating jet with increase in speed
(C) The diameter of the jet is constant and the discharge coefficient is invariant
(D) Flow is produced due to the static head in the float chamber
Answer: (D) Flow is produced due to the static head in the float chamber
Q14. A diesel engine has
(A) 1 valve
(B) 2 valves
(C) 3 valves
(D) 4 valves
Answer: (C) 3 valves
Q15. Theoretically, a four stroke cycle engine should develop _ power as that of a two stroke cycle engine.
(A) Half
(B) Same
(C) Double
(D) Four times
Answer: (A) Half
Q16. For the same compression ratio
(A) Otto cycle is more efficient than the Diesel
(B) Diesel cycle is more efficient than Otto
(C) Both Otto and Diesel cycles are, equally efficient
(D) Compression ratio has nothing to do with efficiency
Answer: (A) Otto cycle is more efficient than the Diesel
Q17. Which of the following statement is correct regarding normal cetane?
(A) It is a standard fuel used for knock rating of diesel engines
(B) Its chemical name is normal hexadecane
(C) It has long carbon chain structure
(D) All of the above
Answer: (D) All of the above
Q18. The theoretically correct mixture of air and petrol is
(A) 10 : 1
(B) 15 : 1
(C) 20 : 1
(D) 25 : 1
Answer: (B) 15 : 1
Q19. The pressure at the end of compression, in petrol engines, is approximately
(A) 10 bar
(B) 20 bar
(C) 25 bar
(D) 35 bar
Answer:(A) 10 bar
Q20. The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of
(A) Morse test
(B) Prony brake test
(C) Motoring test
(D) Heat balance test
Answer: (A) Morse test
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