Introduction:
A shaded pole motor is a type of single-phase induction motor that is commonly used in small appliances, fans, and other low-power applications. It is known for its simplicity and low cost. In this response, we will explain each option and determine which one is not true.

Explanation:

a) it has high starting torque:
This statement is not true. Shaded pole motors have low starting torque. The starting torque is the torque produced by the motor when it is starting from a stationary position. Shaded pole motors rely on the principle of shading coils to create a rotating magnetic field. However, this design does not provide high starting torque, making shaded pole motors unsuitable for applications that require a high starting torque.

b) its direction of rotation is from unshaded to shaded portion of poles:
This statement is true. Shaded pole motors are designed in such a way that the direction of rotation is from the unshaded portion of the poles to the shaded portion. This is achieved by the use of shading coils, which create an imbalance in the magnetic field and cause the motor to rotate in a specific direction.

c) it has a very poor power factor:
This statement is true. Shaded pole motors have a poor power factor. Power factor is a measure of how effectively a motor converts electrical power into useful mechanical power. A poor power factor indicates that a significant portion of the electrical power is being wasted or lost as reactive power. Shaded pole motors have a low power factor due to their simple design and low efficiency.

d) it has very poor efficiency:
This statement is true. Shaded pole motors have a low efficiency. Efficiency is a measure of how effectively a motor converts electrical power into mechanical power. Shaded pole motors have a simple design with a low number of poles, which limits their efficiency. Additionally, the use of shading coils creates additional losses and reduces the overall efficiency of the motor.

Conclusion:
In conclusion, each of the statements regarding a shaded pole motor is true except for option A, which states that it has high starting torque. Shaded pole motors have low starting torque, making them unsuitable for applications that require high starting torque.