PGP Glass Help Desk Executive Interview Questions and Answers

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.

• They consist of two coils of wire, known as the primary and secondary coils, which are wrapped around a magnetic core.

• When an AC voltage is applied to the primary coil, it creates a magne...read more

Motors are classified based on their power source, construction, and application.

• Motors can be classified as AC or DC motors based on their power source.

• Based on construction, motors can be classified as brushed or brushless motors.

• Motors can also be classified based on their application, such as servo motors, stepper motors, etc.

• Other classifications include synchronous and asynchronous motors, single-phase and three-

A house hold electrical equipment circuit diagram shows the electrical connections and components of the equipment.

• The circuit diagram includes symbols for components such as resistors, capacitors, and switches.

• It shows the flow of electricity through the equipment.

• It helps in troubleshooting and repairing the equipment.

• Examples include diagrams for a refrigerator, washing machine, and air conditioner.

Thermocouple is a temperature sensor that measures temperature by the voltage produced by two different metals.

• Consists of two different metals joined together to form a junction

• When the junction is heated, a voltage is produced

• The voltage produced is proportional to the temperature difference between the junction and the other end of the thermocouple

• Used in industries to measure temperature in furnaces, boilers, etc.

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

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

• They have three terminals: emitter, base, and collector.

• Transistors can be either NPN or PNP type.

• They can be used as amplifiers by controlling the amount of current flowing through them.

• They can also be used as switches by turning them on or...read more