I-1

A 12- by 16-in. single-acting steam engine takes steam for its full stroke at 100 psia and exhausts against a pressure (back pressure) of 16 psia. What is the net work done per revolution?

I-2

It is desired to build a compound engine with its low- and high-pressure cylinders double-acting. This engine is to develop 600 indicated hp when using steam having an absolute pressure of 150 psi and an absolute back pressure of 2 psi. The speed of the engine is to be 150 rpm and the piston speed in each cylinder is to be 750 fpm. If the cylinder ratio is to be 4 and the total ratio of expansion 12, find the size of the engine assuming a diagram factor of 0.80.

I-3

A steam engine develops 50 ihp with dry saturated steam supplied at 150 psia. The consumption is 1,250 lb per hr. Calculate and determine the following: ( a) Carnot efficiency, ( b) Rankine efficiency, ( c) actual thermal efficiency, and ( d) engine efficiency.

I-4

Consider a heat engine that operates on the Carnot cycle with steam as the working substance. At the start of the adiabatic expansion, the pressure of the steam is 247.4 psia and the quality is 97 per cent. The lowest temperature in the cycle is 100 F. Find ( a) heat supplied, ( b) heat rejected, and ( c) cycle efficiency.

I-5

What would be the increase in power...