HV Exit Exam • Set 4 Question 9 of 30
In a power transformer, the iron (core) loss remains practically constant from no-load to full-load because:
✓
Direct Answer
Option C: Core magnetic flux remains practically constant across all load levels
Because primary supply voltage and frequency are constant, the main mutual core flux Φ remains virtually constant regardless of load current, keeping core hysteresis and eddy current losses constant.
All Options
A
Transformation ratio is fixed
B
Permeability of the laminated core is infinite
C
Core magnetic flux remains practically constant across all load levels
(Correct Answer)
D
Primary winding current is constant
Detailed Explanation & Context
Because primary supply voltage and frequency are constant, the main mutual core flux Φ remains virtually constant regardless of load current, keeping core hysteresis and eddy current losses constant.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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