Steam Boilers and Engines MCQs

Which of the following statement is correct for a compound steam engine ?

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[A]. The cost of the engine, for the same power and economy, is more than that of a simple steam engine.
[B]. The forces in the working parts are increased as the forces are distributed over more parts.
[C]. The ratio of expansion is reduced, thus reducing the length of stroke.
[D]. The temperature range per cylinder is increased, with corresponding increase in condensation.
✅ The correct answer is option C.

The function of a piston rod is

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[A]. to guide motion of the piston rod and to prevent it from bending
[B]. to transfer motion from the piston to the cross head
[C]. to convert heat energy of the steam into mechanical work
[D]. to exhust steam from the cylinder at proper moment
✅ The correct answer is option B.

The cylinder dimensions of a compound engine may be designed on the basis of

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[A]. equal power developed in each cylinder for uniform turning moment
[B]. equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
[C]. equal temperature drop in each cylinder for economy of steam
[D]. all of the above
✅ The correct answer is option D.