A three phase induction motor is one of the most widely used electrical machines in industrial and domestic applications due to its simple construction, ruggedness, low cost, and high reliability. It converts three phase electrical energy into mechanical energy through the principle of electromagnetic induction. The machine was Invented by Nikola Tesla in 1887. …
Q1. High tides at antipodes are caused due to (a) Gravitational pull of the moon and the sun (b) Gravitational pull of the sun (c) Centrifugal, centripetal and gravitational pull of the sun (d) Centrifugal, centripetal and gravitational pull of the sun and the moon (UPSC Prelims 1986) Answer: (d) Centrifugal, centripetal and gravitational pull …
Q1. Pumice is derived from (a) Volcanic rock (b) Sedimentary rock (c) Igneous rock (d) Acid lava (UPSC Prelims 1986) Answer: (a) Volcanic rock Explanation: Pumice is a light, porous rock formed during volcanic eruptions when gas-rich lava cools rapidly. Its frothy texture is due to trapped gas bubbles, confirming its origin from volcanic rock.
In modern industrial power systems, the reliable operation of motors and generators is critical. These machines represent high capital investment and are often vital to continuous production processes. One of the most effective and widely used protection schemes for safeguarding their windings against internal faults is the Differential Relay. What is a Differential Relay? …
Differential Relay | Working Principle | Application Read More »
Q1. Which of the following statements is true about Annie Besant ? (i) She was the President of Indian National Congress (ii) She was the founder of the Asiatic Society (iii) She was the founder of the Theosophical Society (a) (i) and (ii) (b) (i) and (iii) (c) (i) only (d) (i), (ii) and (iii) …
Q1. Which of the following States has ‘Urdu’ as its official language ? (a) Bihar (b) Jammu & Kashmir (c) Madhya Pradesh (d) Rajasthan (UPSC Prelims 1986) Answer: (b) Jammu & Kashmir Explanation: Urdu is one of the official languages of Jammu & Kashmir, used in administration and education. Other states may have Urdu as …
Q1. Lord Wellesley greatly extended the British dominion in India through (a) Doctrine of Lapse (b) Subsidiary Alliance (c) Partitioning of Indian States (d) Annexing the princely States (UPSC Prelims 1985) Answer: (b) Subsidiary Alliance Explanation: Lord Wellesley used the Subsidiary Alliance system to bring Indian princely states under British control. States had to accept …
Q1. Mandamus means (a) A writ issued by a superior court command that a specified thing be done. (b) A legal term for a prisoner’s right to appear in person and be tried in court. (c) A written public declaration of the intentions, opinions or motives of a sovereign or of a leader, party or …
Q1. Shivaji was coronated at (a) Raigarh (b) Aurangabad (c) Peshawar (d) Bundela (UPSC Prelims 1985) Answer: (a) Raigarh Explanation: Chhatrapati Shivaji Maharaj was coronated in 1674 at Raigarh Fort, marking the formal establishment of the Maratha Empire. The event symbolized his sovereignty and resistance against Mughal rule.