Performance And Testing Of Engines — Part 1 MCQs with Explanations

Engine cranks may not start during winter due to several factors that affect engine performance in cold conditions. Battery Discharge: Cold weather can lead to the discharge of the battery, making it difficult for the engine to crank properly as the battery loses power more quickly in lower temperatures. Weak Spark: A weak spark occurs when the spark plugs fail to generate enough energy to ignite the fuel mixture in cold conditions, preventing the engine from starting. Lean Mixture: In cold weather, the air-fuel mixture may become lean (more air, less fuel), which makes it difficult for the engine to start since more fuel is required to ignite in cold conditions. Thus, the correct answer is 4, 1 and 2 are correct .

25% is the correct answer to “The percentage of the energy in the petrol burnt in the engine which is actually utilized in propelling the car is as little as”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

70% - 90% is the correct answer to “Mechanical efficiency of an automobile engine usually varies in the range:”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Decrease is the correct answer to “The thermal efficiency of an air standard diesel cycle having fixed compression ratio, with increase in cut-off will:”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

1000 is the correct answer to “How many times in a minute does each valve on a 4-stroke engine running at 2000 rpm open and close”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

4,000 kJ is the correct answer to “If the fuel consumption of 4-stroke IC engine is 0.1 kg/min and calorific value of fuel used is 40,000 kJ/kg, then the amount of energy supplied per minute is . . . . . . . .”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

All are correct is the correct answer to “Which of the following is under performance test”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Both are correct is the correct answer to “A Laboratory test bed consists of-”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Driving wheels is the correct answer to “The tractive effort of an automobile is the force required to move the”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

720° of crank rotation is the correct answer to “In a four stroke engine, we get one power stroke in”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Vapour lock is the correct answer to “Stalling of S. I. engine after high speed driving can be caused by”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Both intake and exhaust valve are open is the correct answer to “Valve overlap is the number of degrees of crankshaft rotation during which:”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Breathing capacity of the engine is the correct answer to “Volumetric efficiency is a measure of”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

True is the correct answer to “The total vehicle resistance is the sum of air resistance, rolling resistance and gradient resistance.”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Increases is the correct answer to “The mean effective pressure of diesel cycle having fixed compression ratio will increase if cut-off ratio”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Inversely is the correct answer to “The tractive effort is . . . . . . . . proportional to speed of the vehicle, when the power is constant.”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

3 N-m is the correct answer to “Torqueproduced by the Auto Engine at 4000 r.p.m. is 4 N-m. Torque that can be produced by the same engine at 6000 r.p.m. is”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Pumping work is the correct answer to “The net work per cycle done by the piston on the cylinder gases during the inlet and exhaust stroke is called as”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Dynamometer is the correct answer to “To measure Brake Power of the Auto Engines following device is used.”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

25% to 45% is the correct answer to “In Multi cylinderAuto Engines, heat converted into useful work is about”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Flywheel is the correct answer to “The device for smoothing out the power impulses from the engine is called”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Decreased is the correct answer to “The tractive effort increases if the wheel diameter is”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

35 kW is the correct answer to “If BP of a four-stroke petrol engine is 28 kW and mechanical efficiency is 80%, then IP is . . . . . . . . .”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

All are correct is the correct answer to “The main purpose of inspection is-”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Chassis dynamometer is the correct answer to “The testing equipment which gives a very close approximation of a road test in garage is called”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Multi cylinder engine is the correct answer to “Morse test is carried out to determine the IP of a . . . . . . . .”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

William's line method is the correct answer to “Which one of the following method for determination of engine friction is only applicable for diesel engines and also the gross fuel consumption is plotted against brake power and it is extended backwards to zero fuel consumption”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Larger flow area, reduces the restriction in the exhaust system is the correct answer to “High performance sports car with active exhaust system allows . . . . . . . .”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Mechanical efficiency is the correct answer to “The ratio of brake power to indicated power of an IC engine is called”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Lower than stoichiometric is the correct answer to “Mean effective pressure at a given compression ratio is maximum when the air-fuel ratio is”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Per hour per unit brake horsepower is the correct answer to “The brake specific fuel consumption is expressed as the fuel consumed . . . . . . . .”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Lower than that of diesel engine is the correct answer to “Compression ratio of a petrol engine is”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Both compression and shear forces is the correct answer to “When two rubber blocks are inclined to each other to a 'V' mounting, the rubber will be loaded in . . . . . . . .”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Acceleration is the correct answer to “If the tractive effort of the vehicle at any point of time during motion is more than the resistance of vehicle, then the vehicle will be under”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Actual thermal efficiency to Air-standard efficiency is the correct answer to “Relative efficiency is the ratio of”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

All are correct is the correct answer to “For checking the performance of an automobile which of the following test is necessary”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

Scavenging efficiency is the correct answer to “The ratio of mass of air (or mixture) retained to the mass of trapped cylinder charge is called as . . . . . . . .”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

5% - 10% is the correct answer to “About how much percentage of heat energy equivalent is overcoming engine friction”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

By Motoring Test is the correct answer to “How do you get friction power for single cylinder constant speed diesel engine when only brake dynamometer and fuel measurement arrangements are available”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.

All of the above is the correct answer to “Increase in the compression ratio offers the following advantage:”. This question is standard in competitive examination syllabi for Performance And Testing Of Engines.