Kailash Hospital & Heart Institute Interview Questions and Answers

A diode is a semiconductor device that allows current to flow in one direction only.

• Diodes are commonly used in rectifier circuits to convert AC to DC.

• They are also used in signal processing, voltage regulation, and protection circuits.

• Examples of diodes include silicon diodes, Schottky diodes, and light-emitting diodes (LEDs).

A resistor is an electronic component that resists the flow of electrical current.

• Resistors are used to control the amount of current flowing in a circuit.

• They are measured in ohms (Ω) and have color-coded bands to indicate their resistance value.

• Resistors can be fixed or variable, with variable resistors allowing for adjustment of resistance.

• Examples of resistor applications include voltage dividers, current limiting, and signal conditioning.

Capacitor stores and releases electrical energy.

• Capacitors store electrical energy in an electric field

• They are used in electronic circuits to filter, smooth, or bypass signals

• Capacitors can be polarized or non-polarized

• Examples include decoupling capacitors, timing capacitors, and power factor correction capacitors

A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transforms voltage levels from high to low or vice versa

• Isolation of circuits for safety

• Efficient energy transfer with minimal losses

• Commonly used in power distribution systems

• Examples: step-up transformer, step-down transformer

A coil is a device used to create a magnetic field when an electric current flows through it.

• Coils are commonly used in electromagnets, transformers, inductors, and electric motors.

• The magnetic field generated by a coil can be used for various applications such as data storage in hard drives or wireless charging in smartphones.

• Coils are made by winding wire around a core material such as iron or air to concentrate the magnetic field.

• The number of turns in the coil, the curren...read more

AC voltage alternates direction periodically, while DC voltage flows in one direction constantly.

• AC voltage changes direction periodically, while DC voltage flows in one direction constantly

• AC voltage is commonly used in household appliances, while DC voltage is used in batteries and electronic devices

• AC voltage can be easily converted to different voltage levels using transformers, while DC voltage requires more complex conversion methods