Glasstech Industries Interview Questions and Answers

Transformer and diesel generator sizing involves calculating load requirements and selecting appropriate equipment.

• Calculate total connected load to determine transformer size

• Consider future load growth when sizing transformers

• Calculate total power requirements to determine DG set size

• Factor in starting currents and power factor when sizing DG sets

• Consult manufacturer specifications for accurate sizing

Various types and sizes of cables are available in the market for different electrical applications.

• Types of cables include power cables, control cables, instrumentation cables, communication cables, etc.

• Sizes of cables range from small gauge sizes like 18 AWG to larger sizes like 1000 MCM.

• Examples of cables include THHN, XHHW, Cat5e, RG6, etc.

The process for calculating electrical load involves determining the total power consumption of all devices connected to a circuit or system.

• Identify all devices connected to the circuit or system

• Determine the power rating (in watts) of each device

• Calculate the total power consumption by summing up the power ratings of all devices

• Consider factors like power factor and diversity to account for variations in load

Different types of transformers include power transformers, distribution transformers, instrument transformers, and autotransformers.

• Power transformers are used to step up or step down voltage for transmission and distribution.

• Distribution transformers are used to supply lower voltage to end-users.

• Instrument transformers are used for measuring voltage and current in high voltage systems.

• Autotransformers have a single winding with taps for varying voltage ratios.

Different types of earthing include plate earthing, pipe earthing, rod earthing, strip earthing, and water pipe earthing.

• Plate earthing involves burying a plate made of copper or galvanized iron in the ground.

• Pipe earthing uses a pipe made of galvanized iron to provide a low-resistance path to the ground.

• Rod earthing involves driving a metal rod into the ground to provide a connection for earthing.

• Strip earthing uses a strip made of copper or galvanized iron buried in the gro...read more