NTPC Leading Fireman Interview Questions, Process, and Tips

Heat exchangers are devices used to transfer heat between two or more fluids, without mixing them together.

• Shell and tube heat exchanger

• Plate heat exchanger

• Double pipe heat exchanger

• Finned tube heat exchanger

• Spiral heat exchanger

Preeming is called grooming in the fire service.

• Preeming is the act of cleaning and maintaining equipment in the fire service.

• Grooming ensures that all equipment is in proper working order and ready for use during emergencies.

• Examples of grooming tasks include cleaning and inspecting hoses, nozzles, and other firefighting gear.

Different types of hydrants include wet barrel hydrants, dry barrel hydrants, and post hydrants.

• Wet barrel hydrants are commonly used in warmer climates and have the valve at the top of the hydrant.

• Dry barrel hydrants are typically used in colder climates and have the valve at the bottom of the hydrant to prevent freezing.

• Post hydrants are mounted on a post above ground level and are often used in rural areas or parks.

Different types of couplings include rigid, flexible, sleeve, and clamp couplings.

• Rigid couplings do not allow for any misalignment between shafts

• Flexible couplings can accommodate slight misalignments and vibrations

• Sleeve couplings are simple and inexpensive, but not suitable for high torque applications

• Clamp couplings use screws or clamps to secure the connection between shafts

Different types of hoses used in firefighting include attack hoses, supply hoses, and booster hoses.

• Attack hoses are used to deliver water or foam to extinguish fires.

• Supply hoses are used to bring water from a water source to the fire scene.

• Booster hoses are smaller in diameter and used for small fires or for mop-up operations.