Two components of stray load loss of a synchronous motor are:

Question

Question

This question was previously asked in

SSC JE Electrical 15 Nov 2022 Shift 2 Official Paper

Eddy current and hysteresis losses due to changing flux densities
iron loss due to armature leakage flux and armature ohmic loss due to skin effect
windage loss due to load and frictional loss
field circuit loss due to field resistance and direct load loss

Answer 1

The correct answer is option 2):(iron loss due to armature leakage flux and armature ohmic loss due to skin effect)

Concept:

When an electrical machine is loaded, load current flowing in the armature winding of the machine produces an mmf which distorts the space distribution of mmf produced or set up by the field winding in the air gap.
This distortion of space distribution of mmf or flux density wave in the air gap of machine leads to increased loss in core as well as in armature conductors
This increment in the core loss caused by the distortion of air gap flux plus the increment in ohmic loss i.e. I2R loss due to non uniform distribution of conductor current is called Stray Load Loss.
Two components of stray load loss of a synchronous motor are iron loss due to armature leakage flux and armature ohmic loss due to skin effect
Stray Load loss is due to the circulating currents set up by the alternating leakage flux produced by the load current in the conductor