Phooltas Transrail Locomotive Technician Interview Questions and Answers

Resistance is the opposition to the flow of electric current.

• Resistance is measured in ohms (Ω)

• It is caused by the interaction between electrons and the atoms of a material

• Materials with high resistance are called insulators, while those with low resistance are called conductors

• Resistance can be calculated using Ohm's Law: R = V/I

• Examples of resistors include light bulbs, heating elements, and electronic components

A capacitor is an electronic component that stores energy in an electric field, while a diode is a semiconductor device that allows current to flow in only one direction.

• Capacitors are commonly used in electronic circuits to filter out noise and stabilize voltage.

• Diodes are used in rectifiers, voltage regulators, and signal demodulators.

• Capacitors are measured in farads, while diodes are measured in volts and amperes.

A transistor is a semiconductor device used to amplify or switch electronic signals and power.

• It has three layers of semiconductor material: P-type, N-type, and P-type.

• It can be used as an amplifier to increase the strength of a weak signal.

• It can also be used as a switch to turn a circuit on or off.

• Transistors are commonly used in electronic devices such as computers, radios, and televisions.

An inverter is an electronic device that converts DC power to AC power.

• Inverters are commonly used in solar power systems to convert DC power from solar panels to AC power for use in homes and businesses.

• They are also used in cars to convert DC power from the battery to AC power for charging devices.

• Inverters come in different sizes and capacities depending on the amount of power they can convert.

• They can be pure sine ...read more

Inverter current can be checked using a clamp meter or a multimeter.

• Use a clamp meter to measure the current flowing through the inverter's output wires

• Set the clamp meter to the appropriate range and clamp it around one of the output wires

• Read the current value displayed on the clamp meter

• Alternatively, use a multimeter to measure the voltage drop across a shunt resistor in series with the output wires

• Calculate the cu

IGBT stands for Insulated Gate Bipolar Transistor. It is a power semiconductor device used for switching and amplifying electrical power.

• IGBT combines the advantages of both MOSFET and BJT transistors

• It is used in various applications such as motor drives, power supplies, renewable energy systems, etc.

• IGBT has a high input impedance and low on-state voltage drop

• It is capable of handling high current and voltage levels

• I

The color code of resistance is used to identify the resistance value of a resistor.

• The color code consists of four or five colored bands on the resistor.

• The first two bands represent the significant digits of the resistance value.

• The third band represents the multiplier.

• The fourth band represents the tolerance.

• The fifth band, if present, represents the temperature coefficient.

• For example, a resistor with bands of brow...read more

A diode is an electronic component that allows current to flow in one direction and blocks it in the opposite direction.

• Diodes are commonly used in rectifiers to convert AC to DC

• They are also used in voltage regulators to maintain a constant voltage

• Diodes can be used as a switch in electronic circuits

• They are made of semiconductor materials such as silicon or germanium

Electronic components work based on Ohm's Law, which relates voltage, current, and resistance.

• Ohm's Law states that V = I * R, where V is voltage, I is current, and R is resistance.

• Electronic components such as resistors, capacitors, and inductors follow Ohm's Law in their operation.

• Understanding Ohm's Law helps in designing and troubleshooting electronic circuits.

• For example, in a circuit with a 12V battery and a 4 oh...read more