Bull Machines Interview Questions and Answers

FET stands for Field-Effect Transistor. It is a type of transistor that uses an electric field to control the flow of current.

• FET is a three-terminal device used for amplification and switching of electronic signals.

• It has a high input impedance and low output impedance.

• FETs are classified into two types: JFET (Junction Field-Effect Transistor) and MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).

• The main difference between FET and transistor is that FET uses an ele...read more

Modbus is a communication protocol used in industrial automation. UART is a hardware interface. Bridge rectifier converts AC to DC.

• Modbus is used to communicate between devices in industrial automation systems.

• UART is a hardware interface used for serial communication between devices.

• Bridge rectifier is an electronic component used to convert AC to DC.

• Modbus signals are sent over a serial communication link.

• UART works by sending data one bit at a time over a serial communicat...read more

Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to its resistance.

• Ohm's law is expressed by the formula: V = I * R, where V is the voltage, I is the current, and R is the resistance.

• The law was named after the German physicist Georg Simon Ohm, who first formulated it in 1827.

• Ohm's law is fundamental in understanding and analyzing electrical circuits.

• It helps in calculating the u...read more

The voltage divider rule is used to calculate the voltage across a resistor in a series circuit.

• The voltage divider rule states that the voltage across a resistor in a series circuit is proportional to its resistance.

• The formula for the voltage divider rule is Vout = Vin * (R2 / (R1 + R2)), where Vout is the voltage across R2, Vin is the input voltage, R1 is the resistance before R2, and R2 is the resistance across which the voltage is to be calculated.

• The voltage divider rul...read more

Gas detectors should be strategically placed in areas where gas leaks are most likely to occur.

• Gas detectors should be placed near potential gas leak sources such as gas pipelines, valves, and storage tanks.

• They should also be placed in areas where gas can accumulate such as low-lying areas and confined spaces.

• The number of gas detectors required depends on the size of the area and the potential hazards.

• Gas detectors should be regularly maintained and calibrated to ensure acc...read more

Density of gases varies based on their molecular weight and temperature.

• Density is measured in kg/m³ or g/L.

• At standard temperature and pressure (STP), the density of air is 1.2 kg/m³.

• The density of helium is much lower than air, at 0.1785 kg/m³.

• The density of carbon dioxide is higher than air, at 1.98 kg/m³.

• The density of hydrogen is much lower than air, at 0.0899 kg/m³.