PCBL Chemical Limited Interview Questions, Process, and Tips

VFDs are used in power plants to control the speed and torque of electric motors, resulting in energy savings and improved efficiency.

• VFD stands for Variable Frequency Drive.

• VFDs are used to control the speed of electric motors by varying the frequency of the electrical supply.

• By adjusting the motor speed to match the required load, VFDs help in saving energy and reducing wear and tear on equipment.

• VFDs also provide so...read more

Motor rpm is 1440 instead of 1500 due to the frequency of the power supply.

• Motor rpm is determined by the frequency of the power supply.

• In many countries, the standard frequency of the power supply is 50 Hz.

• The synchronous speed of a motor is determined by the formula: (120 x frequency) / number of poles.

• For a 4-pole motor and a 50 Hz power supply, the synchronous speed is 1500 rpm.

• However, due to slip, the actual spee...read more

Carbon black is a fine black powder used in various industries for its coloring and reinforcing properties.

• Carbon black is produced by the incomplete combustion of petroleum products or natural gas.

• It is commonly used as a pigment in inks, paints, and plastics.

• Carbon black is also used as a reinforcing filler in rubber products, providing improved strength and durability.

• It is used in the manufacturing of tires, convey...read more

Major tests for Carbon Black include particle size analysis, surface area analysis, and ash content analysis.

• Particle size analysis determines the size distribution of carbon black particles.

• Surface area analysis measures the total surface area of carbon black particles.

• Ash content analysis determines the amount of inorganic material present in carbon black.

• Other tests may include pH value, volatile content, and tintin

Yes, I am willing to work in shifts.

• I am flexible and adaptable to different work schedules.

• I understand the importance of round-the-clock quality assurance.

• I have previous experience working in shifts.

• I am committed to ensuring quality at all times, regardless of the shift.

• I am willing to adjust my personal schedule to accommodate shift work.

Yes, I am ready to manage both Online and Offline lab work.

• I have experience in managing both Online and Offline lab work.

• I am comfortable with using technology and software for online lab work.

• I have the necessary skills to oversee and coordinate offline lab work.

• I understand the importance of maintaining quality and accuracy in both types of lab work.

• I am adaptable and can efficiently switch between online and offlin