Electrical Engineering Questions

Question: What happens when a 60 Hz transformer is operated on 50 Hz? Answer: The peak flux and magnetization current of a 60 Hz transformer increase when operated on 50 Hz supply. Explanation The flux in a transformer is defined as the ratio of voltage to frequency. Mathematically, Ømax = [Vmax / f ] * … Read more

Question: Why transformer core is laminated? Answer: Transformer core is laminated to minimize the eddy current. Explanation: What is laminated core? The term laminated core indicates a layered core instead of a single solid core. (See figure below). Eddy currents are current loops generated by changing magnetic fields. They flow in a perpendicular plane to … Read more

Question: What is the basic difference between synchronous and induction motors? Answer: A synchronous motor always runs and synchronous speed and it requires a dc field current. The induction motor always runs at a speed lower than synchronous speed. It doesn’t require a dc field current for running.  

Question: Decode Brown Black Red Gold Resistor value? Answer: 1 kΩ ± 5% You can watch the brief explanatory video below or skip the video to read the text below: Explanation: 10 * 102 ± 5%  = 1 kΩ ± 5%

Question: On what factor does the size of resistor depend? Answer: The size of resistor depends on its wattage rating (power consumption). The higher the power rating, the larger the size becomes.

Question: Explain the basic difference between alternating and direct current? Answer: Alternating current (AC) is defined as the current which changes its polarity after regular interval of time. On the other hand, the direct current is the one whose polarity always remains constant.   Explanation: The actual difference between AC and DC is the flow … Read more