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Browse complete papersWhat does the ignition system in a petrol engine produce?
Spark for combustion
Heat for the carburetor
Pressure for injection
Air-fuel mixture
Correct answer
Spark for combustion
What is the mean effective pressure (MEP)?
Net work per cycle divided by displacement volume
Peak cylinder pressure
Exhaust gas pressure
Fuel injection pressure
Correct answer
Net work per cycle divided by displacement volume
Where does steam expand in an impulse turbine?
At the exit
In moving blades
In both fixed and moving blades
Only in the nozzle
Correct answer
At the exit
Which factor does not affect thermal efficiency in IC engines?
Compression ratio
Heat loss
Ignition timing
Bore size
Correct answer
Compression ratio
Why is compounding done in turbines?
To reduce the turbine cost.
To minimize the casing weight.
To increase steam temperature.
To reduce the rotor speed.
Correct answer
To reduce the turbine cost.
What does ideal nozzle flow assume?
Constant velocity
Adiabatic and isentropic flow
Constant enthalpy
Isothermal expansion
Correct answer
Constant velocity
What does turbocharging an engine improve?
Emissions only
Torque only
Volumetric efficiency and power
Cooling
Correct answer
Emissions only
Why is the gas turbine cycle more suitable than I.C. engines for aircraft?
High part-load efficiency
Lower specific power
Lightweight and compact
Better torque characteristics
Correct answer
High part-load efficiency
What type of mechanism is used in an engine with separate intake and exhaust valves?
Two-stroke cycle
L-head configuration
Port timing
Overhead valve mechanism
Correct answer
Two-stroke cycle
What does the critical pressure ratio in a nozzle depend on?
Inlet pressure
Specific heat ratio
Nozzle length
Friction factor
Correct answer
Inlet pressure