If compression ratio of an engine working on Otto cycle is increased from 5 to 6, its air standard efficiency will increase by
In a diesel engine compression Ratio is 20 : 1.The temperature before and after heat addition at 500K and 1000K respectively, what is the expansion ratio ?
In a IC engine The ratio of Indicated work done to frictional losses is 4 : 3. The mechanical efficiency of the engine is
Mean effective pressure multiplied by swept volume per second gives.
Thermal efficiency of an Diesel cycle is given by
r = Compression ratio
r = Cut off ratio
Morse test is conducted on.
In diesel engine delay period means.
In S.I. engines supercharging will.
In C.I. engines injection advance makes knocking
A S. I. engine working on C.N.G does not require the following part.
For a 6- cylinder engine for evenness of torque firing order is
The ctance number of a mixure containing 60% ISO octane and 40% n - heptane is .
With increase in temperature of intake air, I.C. engine efficiency.
Which of the following engines deve lops maximum brake power
For same compression ratio and for same heat added
Piston compression rings are made of which of the following
Knocking tendency in SI engine reduces with increase in
The maximum limit of air fuel ratio for petrol is
Knocking in C.I. engine occurs during which stage of combustion.
In CI engine the Air fuel mixure is
The area inside an indicator diagram represents
The relationship between swept volume (Vs) clearance volume (Vc) and compression ratio (r) is
For calculating compression ratio you should know the swept volume and clearance volume of the engine cylinder. Then you can use the relation,
Where, r- compression ratio, Vs- Swept Volume and Vc- Clearance Volume.
Octane no. of a fuel can be increased by adding
Methane burns with stoichiometric quantity of a air. The air fuel ratio by weight is
For determining ignition quality of CI engines The reference fuel used are: