Following readings were taken during test of single cylinder four-stroke engine:

Cylinder diameter \(=250 \mathrm{~mm}\); stroke length \(=\) \(400 \mathrm{~mm}\); m.e.p. \(=6.5\) bar; Engine speed \(=250\) rpm; net load on brake \(=1,080 \mathrm{~N}\); effective diameter of brake \(=1.5 \mathrm{~m}\); fuel used per hour \(=\) \(10 \mathrm{~kg}\); calorific value of fuel \(=44,300 \mathrm{~kJ} / \mathrm{kg}\).

Calculate: (i) indicated horse power, (ii) brake horse power, (iii) mechanical efficiency, and (iv) indicated thermal efficiency.