In a four stroke cycle petrol engine, the charge is ignited at 30° after top dead center 30° before bottom dead center 30° before top dead center 30° after bottom dead center TRUE ANSWER : ? YOUR ANSWER : ?
A higher compression ratio causes Acceleration in the rate of combustion Increase in detonation Any one of these Pre-ignition TRUE ANSWER : ? YOUR ANSWER : ?
If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have Geometric similarity Kinematic similarity None of these Dynamic similarity TRUE ANSWER : ? YOUR ANSWER : ?
Which one of the following engines will have heavier flywheel than the remaining ones? 30 kW two-stroke petrol engine running at 1500 r.p.m. 30 kW four-stroke diesel engine running at 750 r.p.m. 30 kW four-stroke petrol engine running at 1500 r.p.m. 30 kW two-stroke diesel engine running at 750 r.p.m. TRUE ANSWER : ? YOUR ANSWER : ?
The pressure at the end of compression, in diesel engines, is approximately 25 bar 20 bar 10 bar 35 bar TRUE ANSWER : ? YOUR ANSWER : ?
The normal heptane (C₇H₁₆) is given a rating of ________ octane number. 100 0 120 50 TRUE ANSWER : ? YOUR ANSWER : ?
A diesel engine is ___ as compared to petrol engine, both running at rated load. Equally efficient None of the listed here More efficient Less efficient TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is false statement?Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following Oil sludge in the engine crank case Formation of hard coating on piston skirts Detonation Piston ring and cylinder wear TRUE ANSWER : ? YOUR ANSWER : ?
Volatility of diesel fuel oil is Temperature at which it solidifies or congeals Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off It catches fire without external aid 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 TRUE ANSWER : ? YOUR ANSWER : ?
The function of a distributor in a coil ignition system of I.C. engines is To distribute power To time the spark To distribute spark To distribute current TRUE ANSWER : ? YOUR ANSWER : ?