Pariyaram Dental College Interview Questions and Answers

The formula for cut of 4 pieces of pipe and 90% is the same as the formula for cut of any number of pieces and percentage.

• The formula for cut is used to determine the length of pipe needed for a specific angle or joint.

• The formula is: (pipe diameter x percentage) x 0.01745 x number of pieces

• For example, for 4 pieces of 2-inch diameter pipe and 90%, the formula would be: (2 x 0.9) x 0.01745 x 4 = 0.251 inches

Preparing a pipe for welding involves several steps to ensure a clean and secure joint.

• Inspect the pipe for any defects or damage

• Clean the pipe surface using a wire brush or grinder to remove any dirt, rust, or scale

• Bevel the pipe ends to create a V-shaped groove for better weld penetration

• Align and fit the pipes together, ensuring proper gap and alignment

• Tack weld the pipes in place to hold them together during the welding process

• Perform a final inspection to ensure the join...read more

To calculate the true length of a pipe, use the Pythagorean theorem and the formula for the circumference of a circle.

• Measure the diameter of the pipe

• Calculate the circumference of the pipe using the formula: C = π * d

• Measure the angle of the pipe bend

• Use the Pythagorean theorem to calculate the true length: L = √(C^2 + (2πrθ)^2)

The formula used in fabrication of a tee is the pipe intersecting formula.

• The formula is used to determine the length of the branch pipe and the angle of intersection.

• The formula is L1 = L2 x tan(A/2), where L1 is the length of the branch pipe, L2 is the run of the tee, and A is the angle of intersection.

• The formula is important in ensuring that the tee is fabricated correctly and fits properly in the piping system.

The take off valve for a 90% elbow is a type of valve used to control the flow of fluid or gas in a pipe system connected to the elbow.

• The take off valve is typically installed at the branch or outlet of the 90% elbow.

• It allows for the diversion or regulation of the flow in the branch pipe connected to the elbow.

• Common types of take off valves include ball valves, gate valves, and globe valves.

• The choice of valve depends on the specific requirements of the pipe system and the...read more

The basic ways of joining a pipe include welding, soldering, brazing, and using mechanical fittings.

• Welding involves melting the edges of the pipes and fusing them together.

• Soldering uses a filler material with a lower melting point than the pipes to join them.

• Brazing is similar to soldering but uses a higher temperature filler material.

• Mechanical fittings include couplings, unions, and flanges that connect pipes without the need for heat or soldering.

• Other methods include ad...read more