Selec Controls Quality Assurance and Testing Interview Questions and Answers

Valve design calculation involves determining the valve size, type, and material based on the fluid properties and system requirements.

• Determine the flow rate and pressure drop across the valve

• Select the appropriate valve type (e.g. globe, gate, ball) based on the application

• Choose the valve material based on the fluid properties and compatibility

• Calculate the valve size based on the flow rate and pressure drop

• Consider...read more

The difference between == and === is that == compares the values of two variables, while === compares both the values and the data types.

• The == operator performs type coercion, meaning it converts the operands to a common type before comparison.

• The === operator does not perform type coercion and requires both the values and the data types to be the same for a true comparison.

• For example, 1 == '1' returns true because t...read more

MCB is a miniature circuit breaker used for low currents, while MCCB is a molded case circuit breaker used for higher currents.

• MCB is designed for low currents, typically up to 100A, while MCCB is designed for higher currents, typically up to 2500A.

• MCB is a compact device with fixed trip settings, while MCCB is larger and has adjustable trip settings.

• MCB is commonly used in residential and commercial applications, whil...read more

A relay is an electrically operated switch that uses an electromagnet to mechanically operate the switch contacts.

• Relays are used to control high power circuits with a low power signal.

• When the coil of the relay is energized, it creates a magnetic field that causes the switch contacts to close or open.

• Relays are commonly used in automotive applications, industrial controls, and home appliances.

• There are different types...read more