Neometrix Engineering 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.

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

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.

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.

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.

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

• Theoretical discharge pump formula is 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.

• The formula can be modified for specific pump types and applications, taking into account factors like pump efficiency and head loss.

• Calculating the theoretical discharge ...read more

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...read more

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

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...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...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 m...read more

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...read more

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, en

Joule-Thomson coefficient is a measure of the temperature change of a gas when it expands or is compressed without any external work being done.

• The Joule-Thomson coefficient is defined as the rate of change of temperature with respect to pressure at constant enthalpy.

• It is denoted by the symbol μ.

• A positive Joule-Thomson coefficient indicates that the gas will cool upon expansion, while a negative coefficient indicates...read more

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, wh...read more