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1) For the same size and weight, a two stroke engine as compared to four stroke engine will generate power_________________? a. about twice b. about 0.5 times c. nearly equal d. about 1.7 times e. about 5 times
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2) If diesel is fed by mistake in the oil tank of a petrol engien, then engine will________________? a. give lot of smoke b. detonate c. knock d. not run e. run for some time and then stop
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3) An engine has a normal speed of 960 r.p.m. and no load speed of 1000 r.p.m. The speed droop of governor will be about___________________? a. 2% b. 4% c. 8% d. ±4% e. 1%.
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4) In isochronous governing, speed droop is_______________? a. 100% b. 50% c. 5% d. 30% e. 1%.
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5) Method of governing used in diesel engine is__________________? a. quantity governing b. quality governing c. combined governing d. partial governing e. nit and miss governing
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6) Method of governing used in petrol engine is________________? a. quantity governing b. quality governing c. combined governing d. partial governing e. hit and miss governing
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7) The termal efficiency of a petrol engine at design load is around_________________? a. 90% b. 50% c. 40% d. 30% e. 15%.
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8) As the number of cylinders in multi-cylinder engine increases, the power to weight ratio_______________? a. Decreases b. Increases c. Remains same d. Decreases upto a limit and then increases
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9) All the four operations in two stroke engine are performed in following number of revolutions of crank shaft______________________? a. Half b. One c. Two d. Four
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10) In the case of petrol engine at maximum output, the percentage of CO in exhaust gases is ____________________? a. Zero b. 5-10% c. Depends on load and quality of fuel d. Considerable percent
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11) In a diesel engine, injection pressure developed by injector is of the order of______________? a. 10 kg/cm2 b. 100 kg/cm2 c. 500 kg/cm2 d. 1400 kg/cm2
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12) In precombustion chamber in diesel engine________________? a. The shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of fuel mixture b. Fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat c. Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency d. There are no valves
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13) The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________? a. increase b. decrease c. remain unaffected d. increase/decrease depending upon engine capacity e. first increase and then decrease
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14) In the case of compression ignition engine, the %age of CO in exhaust gases is________________? a. Zero b. 5-10% c. Depends on load d. Considerable percent
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15) A two stroke engine is usually identified by__________________? a. size of flywheel b. weight of engine c. type of lubrication system d. absence of valves e. location of fuel tank
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16) A two stroke crank compressed engine has following ports in the cylinder_______________? a. suction port and exhaust port b. transfer port only c. suction port and transfer port d. transfer port and exhaust port e. suction port, exhaust port and transfer port
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17) Scavenging air is supplied to a two-stroke engine at a density greater than that of atmosphere. This means the engine is__________________? a. Supercharged b. Not supercharged c. Charged d. Supercharged provided its speed is low
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18) In turbulence chamber in diesel engine__________________? a. the shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect of fuel mixture b. fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat c. only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency d. there are no valves e. fuel is partly burnt by spark
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19) If petrol is used in a diesel engine, then______________? a. higher knocking will occur b. efficiency will be low c. low power will be produced d. black smoke will be produced e. lot of fuel will remain unburnt
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20) Deposition of carbon in petrol engine cylinder would result in increase of__________________? a. clearance volume b. swept volume c. compression ratio d. volumetric efficiency e. mean effective pressure
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21) The part load efficiency of a carburettor is,___________________? a. Maximum b. Optimum c. Poor d. Constant
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22) The basic requirement of a good combustion chamber is___________________? a. high compression ratio b. low compression ratio c. low volumetric efficiency d. minimum turbulence e. high power output and high thermal efficiency
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23) The following type of carburettor is preferred_______________? a. concentric type b. eccentric type c. horizontal type d. vertical type e. none of the above
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24) The theoretically correct mixture of air and petrol is approximately ________________? a. 0.334027778 b. 0.500694444 c. 0.625694444 d. 0.834027778
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25) Carburretion is done to________________? a. feed petrol into cylinder b. govern the engine c. break up and mix the petrol with air d. heat up the charge to cylinder e. scavenge the cylinder
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26) With increase in engine speed, the ignition of spark in petrol engine has to be __________________? a. Unaltered b. Increased c. Decreased d. Advanced
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27) Pick up false statement? a. For petrol and large gas engines, quantity governingds preferred b. In quantity governing, air fuel ratio is almost constant and quantity of charge is changed depending on load c. In hit and miss governing, fuel supply is completely cut off during one or more number of cycles d. In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied e. For close regulation of speed, combination of both quality and quantity governing is used
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