Which of the following is the disadvantage due to low power factor ?

Poor voltage regulation
Increased transmission losses
High cost of equipment for a given load
All of the above

The correct answer is D. All of the above.

A low power factor can cause a number of problems, including:

  • Poor voltage regulation: When a load has a low power factor, it draws more current than it would if it had a high power factor. This extra current can cause the voltage to drop, which can affect other loads on the system.
  • Increased transmission losses: When current flows through a conductor, it causes a loss of power due to resistance. The higher the current, the greater the loss. A low power factor can therefore lead to increased transmission losses.
  • High cost of equipment for a given load: When a load has a low power factor, the equipment that supplies the load must be larger than it would be if the load had a high power factor. This is because the equipment must be able to handle the extra current that is drawn by the load.

In order to improve the power factor of a load, it is often necessary to install a power factor correction device. A power factor correction device is a device that uses capacitors to store energy and then release it to the load in a way that improves the power factor.