South Eastern Coalfields Mechanical Maintenance Technician Interview Questions and Answers

There are three types of alignment: shaft alignment, belt alignment, and gear alignment.

• Shaft alignment involves aligning the rotating shafts of machines to ensure smooth operation and prevent damage.

• Belt alignment refers to aligning the belts in machines such as conveyor systems to prevent slipping and maximize efficiency.

• Gear alignment involves aligning the gears in machines to ensure proper meshing and smooth transm

The number of gearbox motor and compressor alignments varies depending on the specific machinery and requirements.

• The number of gearbox motor and compressor alignments can range from one to multiple, depending on the number of machines and their configurations.

• Each gearbox motor and compressor alignment requires careful measurement and adjustment to ensure proper alignment and efficient operation.

• Examples of alignments...read more

Composite error and ratio error are two types of errors in current transformers.

• Composite error is the combination of ratio error and phase angle error in a current transformer.

• Ratio error is the difference between the actual turns ratio and the specified turns ratio of a current transformer.

• Phase angle error is the angular difference between the primary and secondary currents of a current transformer.

• Composite error a...read more

An AC drive circuit diagram controls the speed of an AC motor by varying the frequency and voltage of the power supplied to it.

• An AC drive consists of a rectifier, DC link, inverter, and control circuitry.

• The rectifier converts AC power to DC power, which is stored in the DC link.

• The inverter converts the DC power back to AC power with variable frequency and voltage.

• The control circuitry adjusts the frequency and volta...read more

A single line diagram of a distribution system is required with proper specifications.

• The diagram should show the flow of power from the source to the load

• It should include all components such as transformers, switchgear, and cables

• The specifications should include voltage levels, power ratings, and protection devices

• The diagram should follow standard symbols and conventions

• Example: A 11 kV distribution system with a 5

Dewpoint test is done in transformer to check the moisture content in the insulation oil.

• Moisture in insulation oil can cause breakdown of transformer insulation

• Dewpoint test helps to determine the moisture content in the oil

• It is a preventive maintenance measure to avoid transformer failure

• The test involves cooling a mirror until dew forms on it, and measuring the temperature at which dew forms

Power transformers are used in transmission systems to step up or down voltage, while distribution transformers are used in distribution systems to step down voltage.

• Power transformers are used in high voltage transmission systems to step up or down voltage for long distance transmission.

• Distribution transformers are used in low voltage distribution systems to step down voltage for local distribution.

• Power transformers...read more

Buchholz relay is used to protect transformers from faults by detecting gas and oil flow abnormalities.

• Buchholz relay is installed in the pipe connecting the transformer tank and conservator tank.

• It operates based on the principle that faults in the transformer generate gases and cause oil flow disturbances.

• When gas or oil flow abnormalities occur, the relay trips and sends a signal to the control panel to isolate the ...read more

MGND stands for Main Ground. It refers to the primary grounding point in an electrical system.

• MGND is the main grounding point in an electrical system.

• It is typically connected to the earth ground to provide a safe path for electrical current to flow in case of a fault.

• MGND helps protect equipment and personnel from electrical shocks.

• It is an essential component in ensuring electrical safety and proper functioning of t

Grounding negative in inverters helps in reducing electromagnetic interference (EMI) and noise.

• Grounding negative in inverters helps in reducing EMI and noise.

• It also helps in improving the efficiency of the inverter.

• Grounding negative is done to provide a reference point for the inverter's output voltage.

• It also helps in protecting the inverter from voltage spikes and surges.

• Examples of inverters that use negative gro...read more