Electrical Engineering MCQs for competitive tests, job tests, university exams are provided on various Electrical and Electronics topics.
Electrical Engineering XYZ MCQs Characteristics of arc quenching medium include: Correct answer: 4. All of these Explanation: Arc quenching medium refers to the substance or material used to extinguish or suppress electrical arcs that may occur in electrical equipment. The characteristics of a suitable arc quenching medium typically include: Therefore, all of the mentioned characteristics … Read more
Electrical Engineering XYZ MCQs Which of the following faults is treated as external fault: Correct answer: 4. All of these Explanation: In summary, all the listed conditions (Over voltage, Failure of prime mover, and Failure of excitation) are treated as external faults in the context of power generation and distribution systems.
Electrical Engineering XYZ MCQs The type of connection that is employed for current transformers for protection ofDelta-Star connected 3-phase transformer: Correct answer: 2. Star-delta
Electrical Engineering XYZ MCQs Which of the following relays are used in protection of medium transmission lines: Correct answer: 2. Impedance relays Explanation: Impedance relays are commonly used for the protection of medium and long transmission lines. They operate based on the measurement of the impedance (resistance and reactance) of the line.
Electrical Engineering XYZ MCQs The preferred type of circuit breaker(CB) to be installed in extra high voltage AC system is: Correct answer: 4. Sulphur hexafluoride CB Explanation: The preferred type of circuit breaker (CB) to be installed in an extra high voltage AC system is typically the Sulphur hexafluoride (SF6) circuit breaker. SF6 circuit breakers … Read more
Electrical Engineering XYZ MCQs The Buchholz relay is used for protecting transformer against: Correct answer: 2. Internal faults Explanation: Therefore, the correct answer to the multiple-choice question is: Internal faults
Electrical Engineering XYZ MCQs Isolator in sub station can only be opened under which of following condition: Correct answer: 3. No load Explanation: An isolator in a substation is a switch that is used to disconnect a part of the electrical circuit for maintenance or repair purposes. It is crucial to ensure the safety of … Read more
Electrical Engineering XYZ MCQs The rating of fuse wire is always expressed in: Correct answer: 1. Amperes Explanation: The correct answer is “Amperes.” The rating of a fuse wire is always expressed in Amperes (A). This indicates the maximum current that the fuse can safely carry without blowing or melting. The purpose of a fuse … Read more
Electrical Engineering XYZ MCQs Mho relay is usually employed for protection of: Correct answer: 3. Long transmission lines only Explanation: The Mho relay, also known as the impedance relay, is typically employed for the protection of long transmission lines. Mho relays operate based on the impedance measurement of the line and are commonly used for … Read more
Electrical Engineering XYZ MCQs Making and breaking currents of 3-phase AC circuit breakers in power system are respectively in what form: Correct answer: 3. Instantaneous and RMS value Explanation: In a 3-phase AC circuit breaker in a power system, the making and breaking currents occur in different forms. Therefore, the making current is in instantaneous … Read more