Transformers Questions

• What is the current through the load in the given circuit?
• A transformer has
• Increasing the number of turns of wire on the secondary of a transformer will
• The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?
• What is the turns ratio of the transformer needed to match a 1 kΩ source resistance to a 160 Ω load?
• If the load doubled in value in the given circuit, what reflected resistance would the source see?
• Mutual induction is dependent on
• What is the power dissipated in the primary of the transformer in the given circuit?
• A special transformer used to convert unbalanced signals to balanced signals is the
• What is the secondary voltage in the given circuit?
• When does maximum power transfer happen from the source to the load?
• If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is
• A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 Ω load. What is the efficiency of the transformer?
• The transformer turns ratio determines
• In the given circuit, the secondary voltage is in phase with the primary voltage.
• Regardless of whether the transformer is step-up or step-down, power in the primary equals the power in the secondary if there is 100% efficiency.
• The reflected load value that the source sees will always be larger than the load value itself.
• If the current drawn in the secondary of a transformer increases, the power in the primary should remain the same.
• The secondary voltages produced by a center-tapped transformer are equal in amplitude but 180° out of phase with respect to the center tap.
• An open secondary winding of a transformer will cause the primary current to be nearly zero.