Dhabriya Polywood Interview Questions and Answers

To detect the source of a fault, a systematic approach is required.

• Start by identifying the symptoms of the fault

• Trace the steps leading up to the fault

• Use diagnostic tools to pinpoint the source of the fault

• Check for any related issues that may have caused the fault

• Document the findings for future reference

4 wire and 2 wire are types of electrical wiring used for different purposes.

• 4 wire is used for three-phase power distribution while 2 wire is used for single-phase power distribution.

• 4 wire has four conductors - three phase conductors and one neutral conductor, while 2 wire has two conductors - one live and one neutral.

• 4 wire is used in industrial and commercial settings while 2 wire is used in residential settings.

• 4 wire is more expensive and complex to install than 2 wire....read more

Signals of pump can be connected to DCS through analog or digital inputs.

• Analog inputs can be used to measure the pump's flow rate, pressure, and temperature.

• Digital inputs can be used to monitor the pump's status, such as on/off or fault conditions.

• The signals can be wired directly to the DCS or through a remote I/O module.

• Proper grounding and shielding techniques should be followed to avoid interference and noise.

• Examples of DCS systems that can connect to pump signals incl...read more

Thermocouple temp is transmitted to DCS through analog signals or digital communication protocols.

• Thermocouple generates a voltage signal proportional to temperature

• This signal is amplified and transmitted to DCS through analog signals or digital communication protocols like HART, Modbus, etc.

• Analog signals are converted to digital signals using analog-to-digital converters (ADC)

• The DCS receives the signal and displays the temperature value on the operator interface

Shuttering oil is used to prevent concrete from sticking to the surface of the shuttering.

• Shuttering oil is applied to the surface of the shuttering to prevent the concrete from sticking to it.

• It helps in easy removal of the shuttering after the concrete has set.

• It also helps in achieving a smooth finish on the concrete surface.

• Using shuttering oil reduces the chances of damage to the shuttering during removal.

• Different types of shuttering oils are available for different typ...read more

The rating of HT panel depends on its voltage and current capacity.

• HT panel rating is determined by its voltage and current capacity

• It can range from 11kV to 33kV or higher

• The current capacity can range from a few hundred amps to several thousand amps

• The rating is usually mentioned on the panel itself or in the technical specifications

• It is important to ensure that the panel rating is suitable for the intended application

A fail-safe circuit is a safety mechanism that ensures a system will shut down in the event of a failure or malfunction.

• Fail-safe circuits are commonly used in industries such as aviation, automotive, and nuclear power.

• They are designed to prevent accidents or damage to equipment by shutting down the system if a fault is detected.

• Examples of fail-safe circuits include emergency brakes in cars and automatic shutdown systems in nuclear power plants.

Silica transmitter measures the level of silica in water by using a colorimetric method.

• Silica reacts with molybdate ions in an acidic solution to form a yellow complex.

• The intensity of the yellow color is proportional to the amount of silica present.

• The color is measured by a photometer and converted into a digital signal.

• The signal is then transmitted to a control system for monitoring and control purposes.