This document contains multiple choice questions about boilers and heat engines. It covers topics like types of boilers, boiler mountings and accessories, parts of internal combustion engines like cylinders, pistons, strokes. Key points covered include: - Types of boilers include water tube and fire tube boilers. - Boiler mountings are for safety during steam generation while accessories increase efficiency. - Heat engines transform chemical energy to thermal then mechanical work. - Internal combustion engines have combustion inside the cylinder while external combustion engines have combustion outside. - Engine parts include cylinders, pistons, connecting rods and crankshafts. Strokes and positions like top dead center are also defined.