Question:
AC voltage regulators are widely used in :
AC voltage regulators are widely used in :
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AC voltage regulators are mainly used for:
• fan speed control,
• lamp dimming,
• heating applications. They vary voltage but not frequency.
• fan speed control,
• lamp dimming,
• heating applications. They vary voltage but not frequency.
Updated On: May 22, 2026
- Fan drives
- Traction Drives
- Synchronous motor drives
- Slip-power recovery scheme of slipping induction motor
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The Correct Option is A
Solution and Explanation
Concept:
An AC voltage regulator controls the RMS value of AC voltage supplied to a load without changing the frequency.
These regulators are commonly used where:
• smooth speed control is required,
• low-cost control is needed,
• torque requirement is moderate. Typical applications include:
• fan speed control,
• light dimmers,
• heating control.
Step 1: Understanding the operation of AC voltage regulators. AC voltage regulators work by controlling: \[ V_{\text{RMS}} \] of the AC supply using devices such as:
• TRIAC,
• SCR,
• thyristors. The output voltage is varied by phase angle control.
Step 2: Analyzing option (1). Fan drives require:
• simple speed variation,
• low power control,
• economical implementation. AC voltage regulators are ideally suited for such applications. Hence: \[ \text{Fan drives} \] is the correct answer.
Step 3: Analyzing option (2). Traction drives require:
• precise speed control,
• high torque,
• sophisticated converters. AC voltage regulators are generally not preferred.
Step 4: Analyzing option (3). Synchronous motor drives usually require:
• variable frequency control,
• excitation control. Thus AC voltage regulators are not commonly used.
Step 5: Analyzing option (4). Slip-power recovery schemes involve:
• rotor power recovery,
• converters and inverters,
• induction motor slip control. Hence simple AC voltage regulators are not used.
Step 6: Selecting the correct answer. Therefore the correct option is: \[ \boxed{(1)\text{ Fan drives}} \]
• smooth speed control is required,
• low-cost control is needed,
• torque requirement is moderate. Typical applications include:
• fan speed control,
• light dimmers,
• heating control.
Step 1: Understanding the operation of AC voltage regulators. AC voltage regulators work by controlling: \[ V_{\text{RMS}} \] of the AC supply using devices such as:
• TRIAC,
• SCR,
• thyristors. The output voltage is varied by phase angle control.
Step 2: Analyzing option (1). Fan drives require:
• simple speed variation,
• low power control,
• economical implementation. AC voltage regulators are ideally suited for such applications. Hence: \[ \text{Fan drives} \] is the correct answer.
Step 3: Analyzing option (2). Traction drives require:
• precise speed control,
• high torque,
• sophisticated converters. AC voltage regulators are generally not preferred.
Step 4: Analyzing option (3). Synchronous motor drives usually require:
• variable frequency control,
• excitation control. Thus AC voltage regulators are not commonly used.
Step 5: Analyzing option (4). Slip-power recovery schemes involve:
• rotor power recovery,
• converters and inverters,
• induction motor slip control. Hence simple AC voltage regulators are not used.
Step 6: Selecting the correct answer. Therefore the correct option is: \[ \boxed{(1)\text{ Fan drives}} \]
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