10+ Star Pipe Foundry Interview Questions and Answers

Negative slip in reciprocating pump occurs when the pump runs faster than the synchronous speed of the motor.

• Negative slip occurs when the pump runs faster than the synchronous speed of the motor.

• This can happen if the pump is not properly matched to the motor or if there is a mechanical issue causing the pump to run faster.

• Negative slip can lead to decreased efficiency and potential damage to the pump.

Pump discharge flow rate can be calculated using the formula Q = A * V, where Q is the flow rate, A is the cross-sectional area of the pipe, and V is the velocity of the fluid.

• Calculate the cross-sectional area of the pipe using the formula A = π * r^2, where r is the radius of the pipe.

• Determine the velocity of the fluid by measuring the speed at which the fluid is flowing through the pipe.

• Multiply the cross-sectional area of the pipe by the velocity of the fluid to calculat...read more

The velocity of flow at the inlet of a Kaplan turbine is typically high due to the design of the turbine blades.

• The velocity of flow at the inlet of a Kaplan turbine is usually between 3 to 10 m/s.

• The high velocity at the inlet helps in maximizing the energy extraction efficiency of the turbine.

• The design of the Kaplan turbine blades allows for efficient energy conversion from the flowing water to rotational motion.

Kaplan turbines are used for low head because they are designed to operate efficiently in low head conditions.

• Kaplan turbines have adjustable blades that allow for optimal performance in low head situations

• They have a higher specific speed compared to other turbine types, making them suitable for low head applications

• Examples of low head applications include run-of-river hydroelectric plants and irrigation systems

Mercury is used in barometers to measure atmospheric pressure because it is denser than water and provides a more accurate reading.

• Mercury is denser than water, so it creates a larger change in height in response to atmospheric pressure changes

• Mercury has a lower vapor pressure than water, making it more suitable for measuring atmospheric pressure accurately

• Mercury does not wet the glass walls of the barometer tube, ensuring a consistent and reliable measurement

Stress is internal resistance to deformation, while pressure is force applied on a surface. A continuous beam is a beam supported at multiple points. Three equilibrium conditions are required to stabilize a body in space.

• Stress is the internal resistance to deformation in a material, while pressure is the force applied on a surface.

• A continuous beam is a structural element that is supported at multiple points along its length, allowing for the transfer of loads across its ent...read more

Nusselt number represents convective heat transfer, Biot number represents ratio of internal resistance to external resistance. Conduction is heat transfer through a material.

• Nusselt number is used to characterize convective heat transfer, while Biot number represents the ratio of internal resistance to external resistance in a material.

• Conduction is the transfer of heat through a material without any movement of the material itself.

• Conduction in solids occurs through the vib...read more

Theoretical discharge pump formula calculates the flow rate of a pump based on various parameters.

• Theoretical discharge pump formula: Q = A * V

• Q = flow rate (volume per unit time)

• A = cross-sectional area of the pipe or pump outlet

• V = velocity of the fluid

• Example: If A = 0.5 m^2 and V = 2 m/s, then Q = 1 m^3/s

w q m stands for weight flow rate in fluid mechanics.

• w q m is a measure of the mass of fluid passing through a given point per unit time.

• It is calculated by multiplying the mass flow rate by the acceleration due to gravity.

• Common units for weight flow rate include kg/s or lb/s.

Centroid and center of gravity are similar concepts, but differ in their applications and calculations.

• Centroid is the geometric center of a shape, while center of gravity is the point where the total weight of an object is considered to act.

• Centroid is used in statics and geometry, while center of gravity is used in physics and mechanics.

• Centroid can be calculated using geometric properties, such as area or volume, while center of gravity depends on the distribution of mass....read more

Load is the total weight supported by a structure or component, while force is a push or pull acting on an object.

• Load is the total weight that a structure or component is supporting, including the weight of the structure itself and any external forces acting on it.

• Force is a vector quantity that represents a push or pull acting on an object, causing it to accelerate or deform.

• Load is a static quantity, while force can be either static or dynamic depending on its application....read more

A filler gauge is a tool used to measure the gap between two objects.

• Filler gauge is used to check the clearance or gap between two surfaces.

• It consists of a set of blades of varying thickness that can be inserted between the surfaces to measure the gap.

• Commonly used in automotive and engineering applications for setting clearances in engines and machinery.

Flow is the movement of a substance from one point to another, while viscosity is the resistance of a fluid to flow.

• Flow refers to the movement of a substance, such as a liquid or gas, from one point to another.

• Viscosity is the measure of a fluid's resistance to flow. High viscosity fluids are thick and flow slowly, while low viscosity fluids are thin and flow quickly.

• Flow and viscosity are important factors in various industries, such as manufacturing, oil and gas, and food ...read more