What will happen if the primary of transformer is connected to DC supply Mcq?

18) If a transformer is connected to a direct current supply, what happened? Explanation: The tapings can be placed either on high voltage (HV) or low voltage (LV) windings. Good voltage regulation is possible with high voltage winding as it carries a large number of turns.

Why can’t we use DC voltage in transformers?

When a d.c voltage source is applied across the primary of the transformer,the current in the primary coil remains constant. Hence there is no change in the magnetic flux linked with the secondary. Therefore the voltage across the secondary coil is zero. Thus a transformer can’t step up dc voltage.

What will happen if DC is supplied to a transformer?

A constant dc source connected to the primary of transformer will have zero EMF. The constant current creates zero induced emf. As a result transformer primary will behave as a short circuit and heavy current will flow through the primary which will, in turn, burn the windings.

What happens to the secondary output voltage of a transformer if the supply frequency is increased?

correct answer is option (A). If frequency increases, the secondary voltage or emf increases. And secondary voltage decreases by the reduction of supply frequency. But with high frequency there is increase in transformer losses like core loss and conductor skin effect.

What will happen if rated DC voltage is applied to a transformer coil?

This causes the primary winding of the transformer to generate an electromagnetic field that is detected by the secondary winding of the transformer. However, when the transformer is supplied with DC power, the field is not generated and EMF is converted to heat. Your transformer has burst.

Can you step up dc voltage using transformer justify?

Transformer cannot step up or step down a dc voltage. Reason: No change in magnetic flux.

What would happen if transformer is connected to a DC supply?

If the primary of a transformer is connected to the DC supply, the primary will draw a steady current and hence produce a constant flux. Consequently, no back EMF will be produced.