Question

In the operation of voltage regulator, as the generator speed rises, the current flowing through the shunt coil of regulator ............... .

• A. decreases
• B. increases
• C. cuts off
• D. varies

Hint:

Tip: Higher speed → lower shunt current → stable voltage!

Answer 1

The Correct Option is A

A voltage regulator controls the output voltage of a generator by adjusting the field current.
The shunt coil carries current to excite the field windings.
At low speeds, more current flows through the shunt coil to maintain sufficient field strength.
As the generator speed increases, the output voltage tends to rise.
To keep the voltage constant, the regulator reduces the current through the shunt coil.
Reducing the field current lowers the magnetic field, which stabilizes the output voltage.
Therefore, as speed rises, the current through the shunt coil decreases.