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MCQs 1: Cetane number is determined by comparing the performance of diesel oil with the following hydrocarbons___________________?

cetane mixture of cetane and alphamethyl napthalene ethylene dibromide mixture of aldehydes and ketones mixture of cetane with tetra-ethyl lead
Answer Explanation

MCQs 2: Violent sound pulsations within the cylinder of an I.C. engine are caused due to_________________?

heavy turbulence improved scavenging heavy supercharging detonation preignition
Answer Explanation

MCQs 3: Ignition lag is__________________?

the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature time before actual fuel injection and the pump plunger starts to pump fuel time corresponding to actual injection and top dead center time corresopnding to actual ingition and top dead center none of the above
Answer Explanation

MCQs 4: Which is correct statement about reaction time for autoignition of fuel and the fuel air ratio__________________?

lean mixture has high reaction time rich mixture has high reaction time chemically correct mixture has mini-mum reaction time all of the above non of the above
Answer Explanation

MCQs 5: Normal heptane_______________?

accelerates auto-ignition helps to resist auto-ignition does not affect auto-ignition has no relation with auto-ighition retards auto-ignition
Answer Explanation

MCQs 6: Ethyl fluid is used_______________________?

to increase the octane rating of the fuel to increase the cetane rating of the fuel as a defrosting agent as a superior type of fluid compared to others to improve lubricating quality of fuel
Answer Explanation

MCQs 7: Octane number is determined by comparing the performance of the petrol with the following hydrocarbons__________________?

iso-octane mixture of normal heptane and iso-oc-tane alpha methyl napthalene mixture of methane and ethane mixture of paraffins and aromatics
Answer Explanation

MCQs 8: Self-ignition temperature of petrol is of the order of___________________?

150°C 240°C 370°C 450°C more than 500°C.
Answer Explanation

MCQs 9: Petrol is distilled at a temperature in range of__________________?

30 – 65°C 65 – 220°C 220-350°C 350-450°C 450-550°C
Answer Explanation

MCQs 10: Auto-ignition temperature is____________________?

minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in conta temperature at which it solidifies or congeals that at which it catches fire without external aid indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off indicated by 50% distillation temperature
Answer Explanation

MCQs 11: The delay period in petrol engine is of the order of__________________?

0.001 sec 0.002 sec 0.01 sec 0.05 sec 0.1 sec
Answer Explanation

MCQs 12: The spark plug gap is normally maintained at________________?

0.1 to 0.2 mm 0.2 to 0.4 mm 0.45 to 0.6 mm 0.6 to 0.8 mm 0.8 to 1 mm
Answer Explanation

MCQs 13: The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be_____________________?

higher lower same depends on size of engine unpredictable
Answer Explanation

MCQs 14: The function of a fuel pump in a petrol pump is to______________________?

inject fuel in cylinder supply fuel when carburettor fails pump fuel so that it reaches carburettor (to improve thermal efficiency) does not exist
Answer Explanation

MCQs 15: Detonation is caused by the following unstable compounds______________________?

peroxides, aldehydes and ketones peroxides, aldehydes, oxides and sul-phides aldehydes, oxides and ketones ketones and sulphur compounds none of the above
Answer Explanation

MCQs 16: Which is false statement about advantages of V-type engine_________________?

compact design requiring lesser space improved distribution of air to cylinder casting less liable to distortion reduced torsional vibration because of shorter crankshaft less overhead clearance
Answer Explanation

MCQs 17: Piston rings are usually made of___________________?

cast iron aluminium phosphor bronze babbitt carbon steel
Answer Explanation

MCQs 18: The top piston ring nearer to the piston crown is known as_____________________?

compression ring oil ring scrapper ring groove ring leading ring
Answer Explanation

MCQs 19: If overhead clearance is less, then the following type of engine should be selected__________________?

V-type In-line Vertical Horizontal Radial
Answer Explanation

MCQs 20: The pistons are usually given a coating such as tin plating in order to________________?

reduce weight conduct heat efficiently reduce possibility of scoring reduce friction increase lubrication effect
Answer Explanation

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