Steam Boilers, Engines, Nozzles and Turbines
The cylinder dimensions of a compound engine may be designed on the basis of

Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
Equal temperature drop in each cylinder for economy of steam
Equal power developed in each cylinder for uniform turning moment
All of these

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Steam Boilers, Engines, Nozzles and Turbines
The diagram factor is the ratio of the

Actual workdone per stroke to the theoretical workdone per stroke
Area of the actual indicator diagram to the area of theoretical indicator diagram
Any one of the above
Actual mean effective pressure to the theoretical mean effective pressure

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following statement is correct for a compound steam engine?

The cost of the engine, for the same power and economy, is more than that of a simple steam engine
The temperature range per cylinder is increased, with corresponding increase in condensation
The forces in the working parts are increased as the forces are distributed over more parts
The ratio of expansion is reduced, thus reducing the length of stroke

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The steam is expanded in nozzles only and there is a pressure drop and heat drop
The steam is expanded in moving blades only
The pressure and temperature of steam remains constant
The steam is expanded both in fixed and moving blades continuously

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