Electrical Engineering MCQs for competitive tests, job tests, university exams are provided on various Electrical and Electronics topics.
Electrical Engineering MCQ The preferred cooling method for large turbine generator: Correct answer: 2. Hydrogen cooling Explanation: Hydrogen is the preferred cooling medium for large turbine generators. Hydrogen has excellent heat transfer properties, low density, and high thermal conductivity. This allows for efficient cooling and helps in maintaining the temperature of the generator within acceptable … Read more
Where do compounding takes place in thermal power plants: Correct answer: 4. Turbine Explanation: In thermal power plants, the process of compounding typically takes place in the turbine. The compounding in a turbine is a method used to increase the overall efficiency of the turbine by dividing it into several stages.
In thermal power plants the size of coal after crushing: Correct answer: 2. 20 – 25 mm
Reactance relays are generally used for the protection of: Correct answer: 2. Short transmission lines only Explanation: Reactance relays play a crucial role in the protection of transmission lines, particularly in the context of short transmission lines. These relays are characterized as overcurrent relays with directional restraint, specifically designed to operate independently of arc resistance. … Read more
Electrical Engineering XYZ MCQ Which of following is an advantage of per unit system: Correct answer: 2. Simplifies comparison Explanation: The per unit system is a method of expressing electrical quantities in a normalized or dimensionless form. In this system, all quantities are expressed in per unit (pu) values, and these values are ratios or … Read more
Most commonly used material for insulator is: Correct answer: 2. Porcelain Explanation: All the materials mentioned in the options (Mica, Porcelain, and Glass) are commonly used as insulators in various electrical and electronic applications. However on a comparative scale, porcelain is most commonly used material for insulators. Porcelain insulators are known for their excellent electrical … Read more
Aluminum is most commonly employed conductor material in transmission lines than copper since: Correct answer: 2. It is cheaper and lighter
Skin effective is more in case of: Correct answer: 2. Communication lines Explanation: For power lines carrying low-frequency AC, skin effect is generally not a significant concern. In contrast, for high-frequency signals, such as those used in communication lines, skin effect becomes more relevant.
If the frequency is increased, then skin effect will: Correct answer: 1. Increase Explanation: The tendency of alternating current to concentrate near the surface of a conductor is termed as skin effect. Skin effect is directly proportional to frequency and it increases with the increase in frequency.
Bundled conductors in EHV transmission lines are used to: Correct answer: 4. Decrease inductance