Orient Paper Mill Diploma Mechanical Engineer Interview Questions and Answers

The maximum voltage of transmission line in India is 765 kV.

• The highest voltage level in India is 765 kV.

• This voltage level is used for long distance transmission of electricity.

• India has several high voltage transmission lines, including the Raigarh-Pugalur HVDC line.

• The maximum voltage level has increased over the years, from 400 kV to 765 kV.

• Higher voltage levels allow for more efficient transmission of electricity.

Various methods like V/F control, rotor resistance control, and vector control are used for speed control of induction motors.

• V/F control method varies the frequency and voltage supplied to the motor to control its speed.

• Rotor resistance control method involves inserting external resistance in the rotor circuit to control the speed.

• Vector control method uses advanced algorithms to control the speed and torque of the mo...read more

Bearings are mechanical components that reduce friction between moving parts.

• Bearings support the load and allow for smooth rotation or linear movement.

• They reduce friction and wear between moving parts.

• Bearings come in various types such as ball bearings, roller bearings, and plain bearings.

• Ball bearings use balls to separate the moving parts and are commonly used in applications like motors and wheels.

• Roller bearings...read more

To identify a problem in a running machine bearing, one can listen for abnormal noises, check for excessive vibration, monitor temperature, and inspect for wear or damage.

• Listen for abnormal noises such as grinding, squeaking, or knocking sounds.

• Check for excessive vibration in the machine or bearing housing.

• Monitor the temperature of the bearing using an infrared thermometer or thermal imaging camera.

• Inspect the beari...read more

To identify problems in gearbox, fans, and blowers, one can perform visual inspections, listen for abnormal noises, check for vibrations, monitor temperature, and conduct performance tests.

• Perform visual inspections to check for any signs of wear, damage, or leaks.

• Listen for abnormal noises such as grinding, rattling, or whining sounds.

• Check for vibrations in the gearbox, fans, or blowers, which may indicate misalignme...read more