Galfar Electrical Maintenance Technician Interview Questions and Answers

The question covers power factor of transformer, types of DC machine, working principle of AC alternator, and DC motors.

• Power factor of a transformer is the ratio of real power to apparent power.

• Types of DC machines include DC motors and DC generators.

• AC alternators work on the principle of electromagnetic induction to convert mechanical energy into electrical energy.

• DC motors convert electrical energy into mechanical ...read more

DTR stands for Data Terminal Ready.

• DTR is a control signal used in serial communication.

• It indicates that a data terminal equipment (DTE) is ready to communicate.

• DTR is typically used to signal the start of a connection or to reset a device.

• In RS-232 communication, DTR is often used to control the flow of data.

• For example, when DTR is set to high, it indicates that the DTE is ready to send or receive data.

DTR structure consists of transformer, rectifier, and filter components.

• Transformer: used to step down the voltage from the power source

• Rectifier: used to convert AC to DC

• Filter: used to smooth out the DC output

• Components may include diodes, capacitors, resistors, and inductors

• Example: DTR structure is commonly used in power supplies for electronic devices

The number of transformer ratings required for 50 households depends on their power consumption and distribution network.

• The power consumption of each household needs to be determined

• The distribution network and voltage level also affect the transformer rating

• Assuming an average power consumption of 1 kW per household, a 50 kW transformer may be required

• However, this can vary greatly depending on the specific circumsta