Stoichiometric air – fuel ratio of petrol is roughly
Venturi in the carburetors result in
For maximum thermal efficiency, the fuel – air mixture in SI engines should be.
During starting petrol engine required
For petrol engines the method of governing is
The choke in an automobile meant for supplying
Modern Carburetors provide the correct quality of air – fuel mixture during
An IC engine has a bore & stroke of 2 units each. The area to calculate heat loss can be taken as
The air fuel ratio for idling speed of an automobile petrol engine is closer to
Consider the following statements:
1. Fuels of higher octane number can be employed at higher compression ratio
2. In CI engines, brake specific fuel consumption decreases with increasing load
Which of the above statements is/are correct?
Consider the following: Carbon, Carbon monoxide, Hydrogen and Sulphur
What is the amount of oxygen (in kg) required for combustion of each one of the above respectively?
Consider the following statements:
1. In a carburetor the throttle value is used to control the fuel supply.
2. The fuel level in the float chambers is to be about 4 to 5 mm below the orifice level of main jet.
3. An idle jet provides extra fuel during sudden acceleration.
4. A choke value restricts the air supply to make the gas richer with fuel.
Which of these statements are correct?
Assertion (A): Octane number is used for rating of fuels in spark ignition engine.
Reason(R): Octane number of a fuel is defined as percentage by volume of iso-octane in a mixture of iso octane and methyl naphthalene.
Methane burns with stoichiometric quantity of air. The air fuel ratio by weight is
A four-cylinder four-stroke SI engine develops an output of 44 kW. If the pumping work is 5% of the indicated work and mechanical loss is an additional 7% , then the power consumed in pumping work is:
A single cylinder, 4-stroke cycle engine is fitted with a rope brake. The diameter of the brake wheel is 600 mm and the rope diameter is 26 mm. The dead weight on the brake is 200 N and the spring balance reads 30 N. If the engine runs at 450 rpm, what will be the brake power of the engine?
The mechanical efficiency of a single cylinder four stroke engine is 80%. If the frictional power is estimated to be 25 kW, the indicated power will be
A single cylinder four stroke engine operating at 80% of mechanical efficiency develops a brake power of 60 kW. The indicated power and the power lost due to friction respectively are
What will be the products of combustion shown by an Orsat analyzer when natural gas burns in deficit air?
Piston of diesel engines are usually cooled by
Which phenomena have the most adverse effect on volumetric efficiency when engine works at high speeds?
For the same indicated work per cycle, mean speed and permissible fluctuation of speed. what is the size of flywheel required for a multi-cylinder engine in comparison to a single cylinder engine?
A 40kW engine has a mechanical efficiency of 80%. If the frictional power is assumed to be constant with load, what is the approximate value of the mechanical efficiency at 50% of the rated load?
Which of the following symptoms shows that the combustion is necessarily complete?
The main objective of morse test is to find out
