Internal Combustion Engines (I.C. Engines) MCQ Questions & Answers | Mechanical Engineering

A steam turbine is a device that extracts thermal energy from pressurized steam and uses it to do mechanical work on a rotating output shaft.

The working cycle in case of four stroke engine is completed in 2 revolutions of crankshaft.

910 m³ volume of air is required for consuming 1 liter of fuel by a four-stroke engine

- Supercharging reduces knocking in diesel engines
- There can be limited supercharging in petrol engines because of detonation
- Supercharging at high altitudes is essential

Step 1: In an internal combustion engine, the spark plug is used to ignite the compressed air-fuel mixture inside the cylinder.

Step 2: To produce a spark, a sufficiently high voltage is required to ionize the gap between the two electrodes of the spark plug.

Step 3: The voltage required depends on factors like gap distance, pressure inside the cylinder, and fuel mixture composition.

Step 4: Generally, the required voltage lies in the range of 6,000 to 10,000 volts under normal engine operating conditions.

Final Answer: The voltage required to produce a spark across the gap is 6,000 to 10,000 volts.

The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the Flow is produced due to the static head in the float chamber

The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine

The process of breaking up or a liquid into fine droplets by spraying is called Atomization

The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is More. Otto cycle is more efficient than Diesel cycle for a given compression ratio. For constant maximum pressure and heat input, the air standard efficiency of gas power cycle is in the order

The correct mixture strength (by weight) for petrol is about 14.6 : 1