Q1: Which of the following is used to produce draught in the locomotive boilers ?

ANS:D - Steam jet arrangement.

The steam jet arrangement is used to produce draught in locomotive boilers. Explanation:

1. Draught in Boilers: Draught, also known as draft, is the flow of air or gases through a boiler, furnace, or other enclosed space. It is essential for maintaining combustion by supplying air to the fire and removing combustion products.
2. Purpose of Draught: Draught in locomotive boilers is necessary to maintain proper combustion of fuel. It helps in supplying the required amount of air to the fire, aiding in the combustion process, and ensuring efficient burning of fuel.
3. Steam Jet Arrangement: In locomotive boilers, draught is commonly produced by a steam jet arrangement. This arrangement utilizes steam ejected from the locomotive's cylinders to create a partial vacuum or suction effect in the smokebox.
4. Functioning: The steam jet arrangement works by directing high-pressure steam from the locomotive's cylinders through nozzles or ejectors into the smokebox or chimney. As the steam expands and exits the nozzles, it creates a low-pressure zone within the smokebox, drawing air and combustion products through the fire tubes and smokebox into the chimney.
5. Advantages: The steam jet arrangement is simple, reliable, and does not require additional mechanical components such as fans or blowers. It utilizes the steam already available in the locomotive's boiler, making it a practical choice for draught production in locomotive boilers.